Configuring Circuit Emulation Services

This chapter describes circuit emulation service (CES) and how to configure the CES T1/E1 port adapters in the Catalyst 8540 MSR, Catalyst 8510 MSR and LightStream 1010 ATM switch routers. You can use CES T1/E1 port adapters for links that require constant bit rate (CBR) services.

The plug-and-play mechanisms of the ATM switch router allow it to come up automatically. All configuration information for port adapters can be saved between hot swaps and switch reboots, while interface types are automatically discovered by the switch, eliminating mandatory manual configuration.

For further information, refer to the following documents:

For overview information, refer to the Guide to ATM Technology.
For complete descriptions of the commands listed in this chapter, refer to the ATM Switch Router Command Reference publication.
For hardware installation and cabling instructions, refer to the ATM Port Adapter Installation Guide.

This chapter includes the following sections:

Overview of CES T1/E1 Interfaces

You can use the CES T1/E1 port adapters for links that require constant bit rate (CBR) services, such as interconnecting Private Branch Exchanges (PBXs), time-division multiplexers, and video conference equipment over campus, public, or private networks.

This section includes the following subsections:

Clocking Options

Each port on the port adapter physical interface can be configured to support the following clocking options:

Self-timing based on a Stratum 4 level clock
Loop timing from the received data stream---ideal for public network connections
Timing synchronized to a selected master clock port; required to distribute a single clock across a network

Interfaces Supported

The following CES T1/E1 interfaces are supported:

Catalyst 8540 MSR---You can configure the four ports on the port adapter as redundant links using the Catalyst 8540 MSR's routing protocols. You can configure your switch with only the number and type of interfaces required, using up to 64 CES T1/E1 interface ports.
Catalyst 8510 MSR and LightStream 1010---You can configure your switch with only the number and type of interfaces required, using up to 32 CES T1/E1 interface ports.

Connectors Supported

The CES T1 port adapters support UTP connectors and the CES E1 port adapters support UTP, foil twisted-pair (FTP), or 75-ohm BNC connectors. Status and carrier-detect LEDs on each port give quick, visual indications of port status and operation. For detailed network management support, comprehensive statistics gathering and alarm monitoring capabilities are provided.

Functions Supported by CES Modules

The functions supported by a CES module include the following:

Circuit emulation service interworking function (CES-IWF), which enables communication between CBR and ATM UNI interfaces
T1/E1 CES unstructured services
T1/E1 CES structured services

Framing Formats and Line Coding Options for CES Modules

The CES modules support the framing formats and line coding options shown in Table 18-1.

Module	Framing Options/Description	Line Coding Options
CES T1 port adapter	Super Frame (SF) Extended Super Frame (ESF)	ami or b8zs (b8zs is default)
CES E1 port adapter (120-ohm)	E1 CRC multiframe (e1_crc_mf_lt). Configure the line type to e1_crc_mf, without channel associated signalling enabled. E1 CRC multiframe (e1_crc_mfCAS_lt). Configure the line type to e1_crc_mf, with CAS enabled. E1 (e1_lt). Configure the line type to e1_lt. E1 multiframe (e1_mfCAS_lt). Configure the line type to e1_mf, with CAS enabled.	ami or hdb3 (hdb3 is default)
CES E1 port adapter (BNC)	E1 CRC multiframe (e1_crc_mf_lt). Configure the line type to e1_crc_mf, without CAS enabled. E1 CRC multiframe (e1_crc_mfCAS_lt). Configure the line type to e1_crc_mf, with CAS enabled. E1 (e1_lt). Configure the line type to e1_lt. E1 multiframe (e1_mfCAS_lt). Configure the line type to e1_mf with CAS enabled.	ami or hdb3 (hdb3 is default)

Table 18-1: CES Module Framing and Line Coding Options

Module Framing Options/Description Line Coding Options

CES T1 port adapter

Super Frame (SF)

Extended Super Frame (ESF)

ami or b8zs (b8zs is default)

CES E1 port adapter (120-ohm)

E1 CRC multiframe (e1_crc_mf_lt). Configure the line type to e1_crc_mf, without channel associated signalling enabled.

E1 CRC multiframe (e1_crc_mfCAS_lt). Configure the line type to e1_crc_mf, with CAS enabled.

E1 (e1_lt). Configure the line type to e1_lt.

E1 multiframe (e1_mfCAS_lt). Configure the line type to e1_mf, with CAS enabled.

ami or hdb3 (hdb3 is default)

CES E1 port adapter (BNC)

E1 CRC multiframe (e1_crc_mf_lt). Configure the line type to e1_crc_mf, without CAS enabled.

E1 CRC multiframe (e1_crc_mfCAS_lt). Configure the line type to e1_crc_mf, with CAS enabled.

E1 (e1_lt). Configure the line type to e1_lt.

E1 multiframe (e1_mfCAS_lt). Configure the line type to e1_mf with CAS enabled.

ami or hdb3 (hdb3 is default)

Default CES T1/E1 ATM Interface Configuration wit hout Autoconfiguration

The following defaults are assigned to all CES T1/E1 interfaces:

Loopback = no loop
Signalling mode = no signalling
Transmit clock source = through timing
Data format = clear channel
Timing = synchronous
Line build out (LBO) = 0 to 110 feet
Cell delay variation = 2000 microseconds
Channel associated signalling (CAS) = FALSE
Partial fill = 47

The following defaults are assigned to CES T1/E1 port adapters:

CES T1 port adapter:
- Framing = ESF
- Line coding = B8ZS
- Line state = no alarm
CES E1 port adapter:
- Line type = E1
- Line coding = HDB3
- International bits = 0x3
- National bits = 0x1f
- Multiframe spare bits = 0xb

The following defaults apply for all versions of the CES modules, unless you change them manually, using specific CLI commands during module configuration:

CES-IWF AAL1 service unstructured---This default setting automatically establishes unstructured (clear channel) services for a CES module.
CES-IWF AAL1 clock source synchronous---This default setting automatically establishes synchronous clocking for all CES-IWF operations.

Manually Changing CES T1/E1 Interface Default Configuration

To manually change any of the default configuration values, perform the following tasks, beginning in global configuration mode:

Step Command Purpose

1 .

interface cbr card/subcard/port

Specifies a CBR interface and enters interface configuration mode.

2 .

ces aal1 clock { adaptive | srts | synchronous }

Configures the type of clocking.The default is synchronous.

3 .

ces aal1 service { structured | unstructured }

Configures the service type. The default is unstructured.

4 .

ces circuit (n) [ cas | cdv | circuit-name | partial-fill | shutdown | timeslots ]

Configures the following CES connection attributes for circuit (n):

Circuit id number.

For unstructured service, use 0.

For CES T1 structured service, use 1 through 24.

For CES E1 structured service, use 1 through 31.

Enables channel-associated signalling for structured service only. The default is no cas.

Enables the peak-to-peak cell delay variation requirement. The range is 1 through 65535 milliseconds. The default is 2000 milliseconds.

Sets the ASCII name for the CES-IWF circuit. The string is 0 through 255. The default is CBRx/x/x:0.

Enables the partial AAL1 cell fill service for structured service only. The range is 0 through 47. The default is 47.

Marks the circuit as administratively down. The default is no shutdown.

Configures the timeslots for the circuit for structured service only.

For CES T1, the range is 1 through 24.

For CES E1, the range is 1 through 31.

5 .

ces dsx1 clock source { free-running | loop-timed | network-derived }

Configures the DSX-1 clock source. The default is network-derived.

6 .

ces dsx1 framing { e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt | sf | esf }

Configures the DSX-1 framing type.

For CES T1, the default is esf.

For CES E1, the default is e1_lt.

7 .

ces dsx1 lbo { 0_110 | 110_220 | 220_330 | 330_440 | 440_550 | 550_660 | 660_above | square_pulse }

Configures the DSX-1 line build-out. The default is 0_110.

8 .

ces dsx1 linecode { ami | b8zs | hdb3 }

Configures the DSX-1 line code type.

For CES T1, the default is b8zs.

For E1, the default is hdb3.

9 .

ces dsx1 loopback {line | noloop | payload }

Configures the DSX-1 loopback test method. The default is noloop.

10 .

ces pvc (n) { dest-address | interface atm card/subcard/port }{vpi | vci } [retry-interval [ first ] [ maximum ]]

Configures the following attributes for PVC (n):

Specifies the destination address of the soft PVC.

Specifies the card/subcard/port number of the atm interface.

Specifies the virtual path identifier of the destination PVC.

Specifies the virtual channel identifier of the destination PVC.

Configures retry interval timers for a soft PVC, as follows:

Specifies in milliseconds, the retry interval after the first failed attempt. The range is 100 to 3,600,000 milliseconds. The default is 5,000 milliseconds.

Specifies in seconds, the maximum retry interval between any two attempts. The range is 1 to 65,535. The default is 60.

Examples

The following example shows how to change the default cell delay variation for circuit 0 to 30,000, using the ces circuit 0 cdv 30000 command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces circuit 0 cdv 30000

The following example shows how to change the default CBR interface DSX-1 framing mode to super frame, using the ces dsx1 framing sf command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)#  ces dsx1 framing sf

The following example shows how to change the default CBR interface DSX-1 line build out to 330-440 feet, using the ces dsx1 lbo 330_440 command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 lbo 330_440

The following example shows how to change the default CBR interface DSX-1 linecode method to binary 8 zero suppression, using the ces dsx1 linecode b8zs command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 linecode b8zs

The following example shows how to change the default CBR interface DSX-1 loopback method to payload, using the ces dsx1 loopback payload command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 loopback payload

The following example shows how to configure the destination address for PVC0 to ATM interface0/0/0, using the ces pvc 0 dest-address interface atm 0/0/0 command:

Switch# config term
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces pvc 0 dest-address interface atm 0/0/0

See the section "Troubleshooting the Interface Configuration" in the chapter "Configuring Port Adapter Interfaces" to confirm your interface configuration.

General Guidelines for Creating Soft PVCs for Circuit Emulation Services

You can create either hard private virtual circuits (PVCs) or soft PVCs for unstructured or structured CES, depending on your particular CES application requirements. This section provides general guidelines for configuring soft PVCs for CES modules. For specific instructions for configuring both hard and soft PVCs, see the following sections:

To configure soft PVCs for either unstructured or structured circuit emulation services, follow these steps:

Step 1 Determine which CES interfaces are currently configured in your ATM switch router chassis, using the show ces status command in privileged EXEC mode. This command displays key information about the currently configured CBR interfaces.

In the following example, the output shows that the CES T1 module is installed in chassis slot 0, module slot 1, and that all four ports (0 to 3) of the module are configured for service.

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24

Step 2 Determine which two ports you want to define as participants in the soft PVC.

Step 3 Decide which of the two ports you want to designate as the destination (or passive) side of the soft PVC.

Note

Step 4 Retrieve the CES-IWF ATM address of the soft PVC's destination end, using the show ces address command. The following example shows how to display the CES-IWF ATM address for a CES circuit:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.20  CBR-PVC-AC
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10  CBR-PVC-CA

Step 5 Retrieve the VPI/VCI values for the circuit using, the show ces circuit command. The following example shows how to display the VPI/VCI values for a CES circuit:

CESwitch# show ces circuit interface cbr 0/1/1 1
 
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / OPER_DOWN
Interface CBR0/1/1, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 681, Bit-Rate 256000
cas OFF, cell_header 0x4100 (vci = 1040)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcInactive, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040
Dst: atm addr default vpi 0, vci 0

Step 6 Configure the source (active) end of the soft PVC last, using the information derived from Step 4 and Step 5.

Note

Configuring T1/E1 Unstructured Circuit Emulation Services

This section provides an overview of unstructured (clear channel) circuit emulation services and describes how to configure CES modules for unstructured circuit emulation services.

Overview of Unstructured Circuit Emulation Services

Unstructured circuit emulation services in an ATM switch router network emulate point-to-point connections over T1/E1 leased lines. This service maps the entire bandwidth necessary for a T1/E1 leased line connection across the ATM network, allowing users to interconnect PBXs, TDMs, and video conferencing equipment. Unstructured CES operations do not decode or alter the CBR data in any way.

For more information about unstructured circuit emulation services, refer to the Guide to ATM Technology.

The circuit you set up on a CBR port for unstructured service is always identified as circuit 0, because you can establish only one unstructured circuit on any given CBR port. An unstructured circuit uses the entire bandwidth of a T1/E1 port, as follows:

A hard PVC on a T1/E1 port---The entire bandwidth of a T1 port (1.544 Mbps) or an E1 port (2.048 Mbps) is allocated manually when you set up the unstructured circuit and remains dedicated to that port, whether that port is actively transmitting CBR data or not.
A soft PVC on a T1/E1 port---The entire bandwidth of a T1 port (1.544 Mbps) or an E1 port (2.048 Mbps) is also allocated manually when you set up the circuit, but this bandwidth is only used by the unstructured circuit when it is active.

The procedures for configuring CES modules for unstructured circuit emulation services are described in the following subsections:

Configuring a Hard PVC for Unstructured CES

A CES module converts CBR traffic into ATM cells for propagation through an ATM network. CBR traffic arriving on a given CES module port must first be segmented into ATM cells. This cell stream is then directed to an outgoing ATM port or CBR port. If the outgoing port is an ATM port on the same ATM switch router chassis, then the PVC is called a hard PVC.

Note As a general rule when configuring a hard PVC, you must interconnect a CBR port and an ATM port in the same ATM switch router chassis.

Figure 18-1 displays unstructured circuit emulation services configured on an ATM switch router, using ATM and CES interface modules to create a hard PVC. In this example, the hard PVC also uses adaptive clocking and this CES circuit enables bidirectional, unstructured CBR traffic to flow between these two modules.

Figure 18-1: Hard PVC Configured for Unstructured Circuit Emulation Services

To configure a hard PVC for unstructured CES, follow these steps, beginning in privileged EXEC mode.

Step Command Purpose

1 .

show ces status

Displays information about current CBR interfaces.

Determine which port is to be the source port.

2 .

show atm status

Displays information about current ATM interfaces.

Determine which port is to be the destination port.

3 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

4 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

5 .

no shutdown

Enables the CES interface.

6 .

ces aal1 service unstructured

Configures the AAL1 service as unstructured.

7 .

ces aal1 clock {adaptive | srts | synchronous}

Configures the AAL1 clock mode.

8 .

ces circuit 0 circuit-name name

Configures the CES interface circuit identifier and circuit name.
Note For unstructured service, use 0 for the circuit identifier.

9 .

ces pvc 0 interface ATM card/subcard/port vpi 0-4095 vci 1-16383

Configures the hard PVC to the ATM interface and VPI/VCI.

Example

The following example shows how to configure the hard PVC for unstructured CES (shown in Figure 18-1):

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24
 
CESwitch# show atm status
 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint)
 
Type       PVCs  SoftPVCs      SVCs      PVPs  SoftPVPs      SVPs      Total
P2P          11         0         0         1         0         0         12
P2MP          0         0         0         0         0         0          0
                                    TOTAL INSTALLED CONNECTIONS =         12
 
PER-INTERFACE STATUS SUMMARY AT 14:56:19 UTC Mon Mar 25 1997:
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello
     Name       Status      Status    Status    Reg State     State    State
------------- -------- ------------ -------- ------------ --------- --------
ATM0            	 	 	 	 UP           up      n/a   Restarting      Idle      n/a
ATM0/0/0            UP           up     done  UpAndNormal    Active  2way_in
ATM0/0/0.25       DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/0.26         UP           up  waiting  WaitDevType      Idle      n/a
ATM0/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM0/0/2            UP           up     done  UpAndNormal    Active  2way_in
ATM0/0/3          DOWN         down  waiting          n/a      Idle      n/a
 
CESwitch# configure terminal
CESwitch(config)# interface CBR 0/1/0 
CESwitch(config-if)# no shutdown
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces aal1 clock adaptive 
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-A 
CESwitch(config-if)# ces pvc 0 interface ATM 0/0/0 vpi 0 vci 100

Verifying a Hard PVC for Unstructured CES

To verify the hard PVC configuration, use the following privileged EXEC commands:

Command Purpose

show ces address

Shows the CES address for the destination end of the circuit.

show ces circuit

Shows configuration information for the hard PVC.

show ces circuit interface cbr card/subcard/port circuit_id

Shows detailed interface configuration information for the hard PVC.

Command	Purpose
show ces address	Shows the CES address for the destination end of the circuit.
show ces circuit	Shows configuration information for the hard PVC.
show ces circuit interface cbr card/subcard/port circuit_id	Shows detailed interface configuration information for the hard PVC.

Examples

The following example shows how to display the CES-IWF ATM address for the destination end of the circuit shown in Figure 18-1, using the show ces address command:

CESwitch# show ces address
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A

The following example shows how to display the basic information about the hard PVC shown in Figure 18-1, using the show ces circuit command:

CESwitch# show ces circuit
Interface	 Circuit 	Circuit-Type 	X-interface	 X-vpi	 X-vci	 Status	
 CBR0/1/0	 0HardPVC	ATM0/0/0	 0	 100	 UP

The output from this command verifies the source and destination port IDs of the hard PVC and indicates that the circuit status is up.

The following example shows how to display detailed information about the hard PVC shown in Figure 18-1, using the show ces circuit interface command:

CESwitch# show ces circuit interface CBR0/1/0 0
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP
Interface CBR0/1/0, Circuit_id 0, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_ADAPT
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
Configured cdv 2000 usecs, Measured cdv unavailable
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      883, startDequeueDepth      493
Partial Fill:       47, Structured Data Transfer 0
HardPVC       
src: CBR0/1/0 vpi 0, vci 16
Dst: ATM0/0/0 vpi 0, vci 100

The output from this command verifies the following configuration information:

The circuit named CBR-PVC-A is in an UP state.
The interface CBR 0/1/0 has a circuit id of 0 (because the entire bandwidth of the port is dedicated to that circuit).
The AAL1 clock mode is adaptive clocking.
The source port for the hard PVC is CBR 0/1/0. The destination port is ATM 0/0/0.

Configuring a Soft PVC for Unstructured CES

In a soft PVC, as well as a hard PVC, you configure both ends of the CES circuit. However, a soft PVC typically involves CES modules at opposite edges of an ATM network, so a soft PVC can be set up between any two CES modules anywhere in your network.

The destination address of a soft PVC can point to either of the following:

A port in the same ATM switch router chassis
A port in any other CES module in the network

For example, to set up a soft PVC involving a local node and a destination node at the opposite edge of the network, you need to determine the CES-IWF ATM address of the port in the destination node to complete soft PVC setup.

To obtain the destination address (dest-address) for a port already configured in a CES module, log into the remote ATM switch router containing that module. Then use the show ces address command to display all the CES-IWF ATM addresses currently configured for that node. For an example of the show ces address command, see the section "General Guidelines for Creating Soft PVCs for Circuit Emulation Services" earlier in this chapter.

For simplicity, the procedure in this section assumes that you are creating a soft PVC between interface modules in the same ATM switch router.

Figure 18-2 shows a logical representation of the soft PVC used in the following example procedure.

Figure 18-2: Soft PVC Configured for Unstructured Circuit Emulation Services

Configuring a soft PVC for unstructured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of the Soft PVC

To configure the destination (passive) side of a soft PVC destination port, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces status

Displays information about current CBR interfaces.

Use this command to determine which port is to be the destination port.

2 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

4 .

ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

5 .

no shutdown

Enables the CES interface.

6 .

ces aal1 service unstructured

Configures the CES interface AAL1 service as unstructured.

7 .

ces aal1 clock {adaptive | srts | synchronous}

Configures the CES interface AAL1 clock mode.

8 .

ces circuit 0 circuit-name name

Configures the CES interface circuit identifier and circuit name.
Note For unstructured service, use 0 for the circuit identifier.

Example

The following example shows how to configure the destination (passive) side of a soft PVC, as shown in Figure 18-2:

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/1
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# no shutdown
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-B

Phase 2---Configuring the Source (Active) Side of the Soft PVC

To configure the source (active) side of a soft PVC destination port, follow these tasks, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces address

Shows the CES address for the destination end of the circuit.

2 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

4 .

ces pvc 0 dest-address remote_atm_address vpi 0-4095 vci 1-16383

Configures the soft PVC to the destination CES-IWF ATM addresses and VPI/VCI of the circuit.
Note For unstructured service, use 0 for the circuit identifier.

Example

The following example shows how to configure the source (active) side of a soft PVC, as shown in Figure 18-2:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# ces pvc 0 dest-address 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0 vci 1040

Verifying a Soft PVC for Unstructured CES

To verify the soft PVC configuration, use the following privileged EXEC commands:

Command Purpose

show ces circuit

Shows the soft PVC configuration information.

show ces circuit interface card/subcard/port circuit_id

Shows the detailed soft PVC interface configuration information.

Command	Purpose
show ces circuit	Shows the soft PVC configuration information.
show ces circuit interface card/subcard/port circuit_id	Shows the detailed soft PVC interface configuration information.

Examples

The following example shows how to display the soft PVC configured in the previous section (shown in Figure 18-2), using the show ces circuit command:

CESwitch# show ces circuit
Interface	 Circuit	 Circuit-Type	 X-interface	 X-vpi	 X-vci	 Status
 CBR0/1/0	0Active SoftVC	UNKNOWN 	0	0	UP
 CBR0/1/1	0	Passive SoftVC	UNKNOWN 	0	0	UP

The following example shows how to display the detailed circuit information for port 1 (CBR 0/1/1), the destination (passive) side of the soft PVC (shown in Figure 18-2), using the showces circuit interface cbr 0/1/1 0 command:

CESwitch# show ces circuit interface cbr 0/1/1 0
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / 
Interface CBR0/1/1, Circuit_id 0, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x4100 (vci = 1040)
cdv 2000 usecs, Measured cdv 316 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      879, startDequeueDepth      491
Partial Fill:       47, Structured Data Transfer 0
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040
Dst: atm addr default vpi 0, vci 0

The following example shows how to display the detailed circuit information for port 0 (CBR 0/1/0), the source (active) side of the soft PVC (shown in Figure 18-2), using the showces circuit interface cbr 0/1/0 0 command:

CESwitch# show ces circuit interface cbr 0/1/0 0
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 0, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
cdv 2000 usecs, Measured cdv 316 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      879, startDequeueDepth      491
Partial Fill:       47, Structured Data Transfer 0
Active SoftVC 
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040

Configuring T1/E1 Structured (N x 64) Circuit Emulation Services

This section provides an overview of structured (N x 64 Kbps) circuit emulation services and describes how to configure CES modules for structured circuit emulation services.

Overview of Structured Circuit Emulation Services

An important distinction between structured and unstructured circuit emulation services is that structured circuit emulation services allow you to allocate T1/E1 bandwidth. Structured circuit emulation services only use the T1/E1 bandwidth actually required to support the active structured circuit(s) you configure.

For example, configuring a CES module for structured services allows you to define multiple hard PVCs or soft PVCs for any CES T1 or E1 port.

In both module types, any bits not available for structured circuit emulation services are used for framing and out-of-band control.

Note Structured circuit emulation services require network clock synchronization. See the section "Configuring Network Clocking" in the chapter "Initially Configuring the ATM Switch Router."

N x 64 refers to a circuit bandwidth (data transmission speed) provided by the aggregation of N x 64-Kbps channels, where N is an integer greater than 1. The 64-Kbps data rate, or the DS0 channel, is the basic building block of the T carrier systems (T1, T2, and T3).

The T1/E1 structured (N x 64) circuit emulation services enable a CES module to function in the same way as a classic digital access and crossconnect system (DACS) switch.

The Simple Gateway Control Protocol (SGCP) controls Voice over IP gateways by an external call control element (called a call-agent). This has been adapted to allow SGCP to control ATM switch router CES circuits (called endpoints in SGCP). For additional information see the section "Configuring SGCP" later in this chapter.

For overview information about structured circuit emulation services, refer to the Guide to ATM Technology.

The procedures for configuring CES modules for unstructured circuit emulation services are described in the following subsections:

Configuring a Hard PVC for Structured CES

This section describes how to configure a hard PVC for structured circuit emulation services.

Figure 18-3 shows that the hard PVC for structured CES connection is configured with the following parameters:

Four time slots (DS0 channels 1 to 3, and 7) are configured for a circuit named CBR-PVC-A.
Channel associated signalling (CAS) is not enabled. For information about configuring a soft PVC with CAS see the "Configuring a Soft PVC for Structured CES" section.
ATM port 0/0/0 in the ATM switch router is designated as the destination port of the hard PVC.

Figure 18-3: Hard PVC Configured for Structured Circuit Emulation Services

To configure the CES port for structured CES, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces status

Displays information about current CBR interfaces.

Use this command to determine which port is to be the source port.

2 .

show atm status

Displays information about current ATM interfaces.

Determine which port is to be the destination port.

3 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

4 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

5 .

ces dsx1 linecode {ami | b8zs}

Configures the DSX-1 line coding.

6 .

ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

7 .

ces dsx1 framing {esf | sf}

Configures the CES line type.

8 .

no shutdown

Enables the CES interface.

9 .

ces aal1 service structured

Configures the CES interface AAL1 service type.

10 .

ces aal1 clock {adaptive | srts | synchronous}

Configures the CES interface AAL1 clock mode.

11 .

ces circuit { 1-24 } timeslots { 1-24 }

Configures the CES interface circuit identifier and specifies which timeslots will comprise the CES-IWF circuit.
Note For structured service, use 1-24, not 0, for the circuit identifier. The 0 circuit identifier is reserved for unstructured service.

12 .

ces circuit { 1-24 } circuit-name name

Configures the CES circuit name.

13 .

ces pvc { 1-24 } interface ATM card/subcard/port vpi 0-4095 vci 1-16383

Configures the hard PVC to the ATM interface and VPI/VCI.

Example

The following example shows how to configure the hard PVC for structured CES, as shown in Figure 18-3:

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24
 
CESwitch# show atm status
 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint)
 
Type       PVCs  SoftPVCs      SVCs      PVPs  SoftPVPs      SVPs      Total
P2P          11         0         0         1         0         0         12
P2MP          0         0         0         0         0         0          0
                                    TOTAL INSTALLED CONNECTIONS =         12
 
PER-INTERFACE STATUS SUMMARY AT 14:56:19 UTC Mon Mar 25 1997:
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello
     Name       Status      Status    Status    Reg State     State    State
------------- -------- ------------ -------- ------------ --------- --------
ATM0            	 	 	 	 UP           up      n/a   Restarting      Idle      n/a
ATM0/0/0            UP           up     done  UpAndNormal    Active  2way_in
ATM0/0/0.25       DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/0.26         UP           up  waiting  WaitDevType      Idle      n/a
ATM0/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM0/0/2            UP           up     done  UpAndNormal    Active  2way_in
ATM0/0/3          DOWN         down  waiting          n/a      Idle      n/a
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# no shutdown
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces circuit 1 timeslots 1-3,7
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-A
CESwitch(config-if)# ces pvc 1 interface atm 0/0/0 vpi 0 vci 100

Note In the synchronous clocking mode, the PRS is always derived from the networking environment. You must set the CBR port to use this clocking signal for synchronizing CBR data transport.

If you do not explicitly specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR0/1/0:1. For structured CES, the circuit number sequence always begins at 1 for each port in a CES module.

The VPI/VCI values shown in the example (vpi 0 vci 100) are for demonstration purposes only. The service provider you select gives you a virtual path for your data, but you must decide which VCI number to assign to the circuit.

Verifying a Hard PVC for Structured CES

To verify the hard PVC configured with structured services, use the following privileged EXEC commands:

Command Purpose

show ces address

Shows the CES address for the destination end of the circuit.

show ces circuit

Shows the configuration information for the hard PVC.

show ces circuit interface card/subcard/port circuit_id

Shows the detailed interface configuration information for the hard PVC.

Examples

The following example shows the 20-byte CES-IWF ATM address assigned to the source end of the hard PVC (shown in Figure 18-3), using the show ces address command:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A

This address is implicitly assigned by the CES hardware to identify the source end of the hard PVC.

The following example shows the details of the hard PVC, shown in Figure 18-3, using the show ces circuit command:

CESwitch# show ces circuit 
Interface	Circuit	Circuit-Type	 X-interface 	X-vpi 	X-vci	 Status
 CBR0/1/0	1	HardPVC	ATM0/0/0	0	100	UP

The output from this command verifies the source and destination port IDs of the hard PVC and indicates that the circuit is up.

The following example shows the interface details for port CBR 0/1/0 (shown in Figure 18-3), using the show ces circuit interface cbr 0/1/0 1 command:

CESwitch# show ces circuit interface cbr 0/1/0 1
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7
Channels used by this circuit: 1-3,7
Cell-Rate: 681, Bit-Rate 256000
cas OFF, cell_header 0x100 (vci = 16)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcLoc, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
HardPVC       
src: CBR0/1/0 vpi 0, vci 16
Dst: ATM0/0/0 vpi 0, vci 100

The output from this command verifies the following configuration information:

The circuit named CBR-PVC-A is in an UP state.
The interface CBR 0/1/0 has a circuit id of 1 (because structured CES services always begin at 1 for each port in a CES module).
The AAL1 clock mode is synchronous.
The channels being used by this circuit are 1-3 and 7.
The source port for the hard PVC is CBR 0/1/0. The destination port is ATM 0/0/0.

Configuring a Soft PVC for Structured CES

The destination address of a soft PVC can point to either of the following:

A port in the same ATM switch router chassis
A port in any other CES module in the network

To obtain the destination address (dest-address) for an already configured port in a CES module, log into the remote ATM switch router containing that module. Then use the show ces address command to display all the CES-IWF ATM addresses currently configured for that node. For an example of the show ces address command, see the section "General Guidelines for Creating Soft PVCs for Circuit Emulation Services" earlier in this chapter.

For simplicity, the procedure in this section assumes that you are creating a soft PVC between interface modules in the same ATM switch router.

This section describes how to configure a soft PVC for structured service based on the following assumptions:

Four time slots (DS0 channels) are configured for the soft PVC, as follows:
- For circuit CBR-PVC-A: DS0 channels 1 to 3 and 7 are used on port CBR 0/1/0.
- For circuit CBR-PVC-B: DS0 channels 10--- to 13 are used on port CBR 0/1/1.
Channel-associated signalling (CAS) is not enabled.
The source (active) side of the soft PVC is named CBR-PVC-A.
The destination (passive) side of the soft PVC is named CBR-PVC-B.

Figure 18-4 shows an example of a soft PVC configured for structured CES.

Figure 18-4: Soft PVC Configured for Structured Circuit Emulation Services

Configuring a soft PVC for structured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of a Soft PVC

To configure a destination (passive) side of a soft PVC for structured CES, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces status

Displays information abut the current CBR interfaces

Use this command to determine which port is to be the destination port.

2 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

4 .

ces dsx1 linecode {ami | b8zs}

Configures the DSX-1 line coding.

5 .

ces dsx1 framing {esf | sf}

Configures the DSX-1 framing.

6 .

ces dsx1 clock source network-derived

Configures the DSX-1 clock source.

7 .

no shutdown

Enables the CES interface.

8 .

ces aal1 service structured

Configures the AAL1 service type.

9 .

ces aal1 clock {adaptive | srts | synchronous}

Configures the AAL1 clock mode.

10 .

ces circuit {1-24} timeslots {1-24}

Configures the CES interface circuit identifier and list of T1 time slot number(s) that comprise the CES-IWF circuit.
Note For structured service, use 1-24, not 0, for the circuit identifier. The 0 circuit identifier is reserved for unstructured service.

11 .

ces circuit {1-24} circuit-name name

Configures the CES interface circuit name.

Example

The following example shows how to configure the destination (passive) side of a soft PVC for structured CES, as shown in Figure 18-4:

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/1
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# no shutdown
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces circuit 1 timeslots 10-13 
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-B
CESwitch(config-if)# end

Note In the synchronous clocking mode, the PRS is always derived from the networking environment. You must set the CBR port to use this clocking signal for synchronizing CBR data transport.

Phase 2---Configuring the Source (Active) Side of a Soft PVC

To configure the source (active) side of a soft PVC for structured CES, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces address

Shows the CES address for the destination end of the circuit.

2 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

4 .

ces circuit {1-24} timeslots {1-24}

Configures the CES interface circuit identifier and specifies the timeslot(s) that will comprise the CES-IWF circuit.
Note For structured service, use 1-24, not 0, for the circuit identifier. The 0 circuit identifier is reserved for unstructured service.

5 .

ces circuit {1-24} circuit-name name

Configures the CES interface circuit identifier and circuit name.

6 .

ces pvc 1 dest-address remote_atm_address vpi 0-4095 vci 1-16383

Configures the soft PVC to the destination CES-IWF addresses and VPI/VCI of the circuit.

Example

The following example shows how to configure the source (active) side of a soft PVC for structured CES, as shown in Figure 18-4:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# ces circuit 1 timeslots 1-3, 7
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-A
CESwitch(config-if)# ces pvc 1 dest-address 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0 vci 1040

Note If you do not explicitly specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR0/1/0:1. For structured circuit emulation services, the circuit number sequence always begins at 1 for each port in a CES module.

Verifying a Soft PVC for Structured CES

To verify the soft PVC configured with structured CES, use the following EXEC commands:

Command Purpose

show ces address

Shows the CES address for the destination end of the circuit.

show ces circuit

Shows the configuration information for the soft PVC.

show ces circuit interface card/subcard/port circuit_id

Shows the detailed interface configuration information for the soft PVC.

Examples

The following example shows the CES-IWF ATM addresses for the soft PVC (shown in Figure 18-4), using the show ces address command at the privileged EXEC mode prompt:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B

The following example shows the details of the CES circuit (shown in Figure 18-4), using the show ces circuit command:

CESwitch# show ces circuit 
Interface	Circuit	Circuit-Type	X-interface	X-vpi	X-vci	Status
 CBR0/1/0	1	Active SoftVCUNKNOWN	0	0UP
 CBR0/1/1	1	Passive SoftVC	UNKNOWN	0	0	UP

The following example shows the interface details for the source port CBR 0/1/0 (shown in Figure 18-4), using the show ces circuit interface cbr 0/1/0 1 command:

CESwitch# show ces circuit interface cbr 0/1/0 1
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7
Channels used by this circuit: 1-3,7
Cell-Rate: 681, Bit-Rate 256000
cas OFF, cell_header 0x100 (vci = 16)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
Active SoftVC 
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040

The following example shows the interface details for the destination port (CBR 0/1/1) (shown in Figure 18-4), using the show ces circuit interface cbr 0/1/1 1 command:

CESwitch# show ces circuit interface cbr 0/1/1 1
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / 
Interface CBR0/1/1, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 681, Bit-Rate 256000
cas OFF, cell_header 0x4100 (vci = 1040)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040
Dst: atm addr default vpi 0, vci 0

Configuring a Soft PVC for Structured CES with CAS Enabled

Since the CES T1/E1 port adapter emulates CBR services over ATM networks, it must be able to support channel-associated signalling information that is introduced into structured CES circuits by PBXs and TDMs. An optional CAS feature for the CES T1/E1 port adapter meets this requirement.

CAS information carried in a CBR bit stream can be configured with a CES module, as follows:

The optional CAS feature is not enabled (the default state). For information about configuring a soft PVC for structured CES without CAS enabled, see the "Configuring a Soft PVC for Structured CES" section.
The optional CAS feature is enabled, but without the optional, Cisco-proprietary on-hook detection feature enabled. This option is described in the following procedure.
Both the optional CAS and on-hook detection features are enabled. For information about configuring a soft PVC for structured CES with both CAS and on-hook detection enabled, see the "Configuring a Soft PVC for Structured CES with CAS and On-Hook Detection Enabled" section.

This section describes how to configure a soft PVC for structured CES with channel-associated signalling (CAS) enabled. The following procedure is based on the following assumptions:

Four time slots (DS0 channels) remain as previously configured for the soft PVC:
- For circuit CBR-PVC-A: DS0 channels 1 to 3 and 7 are used on port CBR0/1/0.
- For circuit CBR-PVC-B: DS0 channels 10 to 13 are used on port CBR0/1/1.
CAS is enabled for the circuit.
The signalling mode for the CBR ports is set to "robbedbit."
The source (active) side of the soft PVC (CBR-PVC-A) remains as previously configured.
The destination (passive) side of the soft PVC (CBR-PVC-B) remains as previously configured.

Figure 18-5 shows a soft PVC configured for structured CES with CAS enabled.

Figure 18-5: Soft PVC Configured for Structured Circuit Emulation Services with CAS Enabled

To configure a soft PVC for structured CES with CAS enabled, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces status

Displays information about the current CBR interfaces.

Use this command to determine which ports are to be configured with CAS enabled.

2 .

configure terminal

At the privileged EXEC mode prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

4 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

5 .

ces dsx1 signalmode robbedbit

Configures the signal mode to robbedbit.

6 .

ces circuit {1-24} cas [cdv 1-65535 | circuit-name name | on-hook-detect 0-F | partial-fill 20-47 | shutdown]

Enables channel-associated signalling.

7 .

no shutdown

Enables the interface.

8 .

Exit

Exits configuration mode for the selected interface.

9 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

10 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

11 .

ces dsx1 signalmode robbedbit

Configures the signal mode to robbedbit.

12 .

ces circuit {1-24} cas [cdv 1-65535 | circuit-name name | on-hook-detect 0-F | partial-fill 20-47 | shutdown]

Enables channel-associated signalling.

13 .

no shutdown

Enables the interface.

Example

The following example shows how to enable channel-associated signalling on the soft PVC configured (see Figure 18-5):

CESwitch# show ces status
 
Interface      IF      Admin        Port  Channels in
Name       Status   Status        Type      use    
------------- -------- --------- ----------- -----------
	CBR0/1/0	UP	UP	T1 	1-24
	CBR0/1/1	UP	UP	T1	1-24
	CBR0/1/2	UP	UP	T1	1-24 
	CBR0/1/3	UP	UP	T1	1-24
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces dsx1 signalmode robbedbit 
CESwitch(config-if)# ces circuit 1 cas
CESwitch(config-if)# no shutdown
CESwitch(config-if)# exit
CESwitch(config)# interface cbr 0/1/1
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces dsx1 signalmode robbedbit 
CESwitch(config-if)# ces circuit 1 cas
CESwitch(config-if)# no shutdown

Verifying a Soft PVC for Structured CES with CAS Enabled

To verify the soft PVC with structured CES and CAS enabled, use the following EXEC commands:

Command Purpose

show ces address

Shows the CES address for the destination end of the circuit.

show ces circuit

Shows the configuration information for the soft PVC.

show ces circuit interface card/subcard/port circuit_id

Shows the detailed interface configuration information for the soft PVC.

Examples

The following example displays the details of the CES circuit (shown in Figure 18-5), using the show ces circuit command at the privileged EXEC mode prompt:

CESwitch# show ces circuit 
Interface	Circuit	Circuit-Type	X-interface	X-vpi	X-vci	Status
 CBR0/1/0	1	Active SoftVC	UNKNOWN	0	0	UP
 CBR0/1/1	1	Passive SoftVC	UNKNOWN	0	0	UP

The following example displays the CES-IWF ATM addresses for the soft PVC (shown in Figure 18-5), using the show ces address command:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B

The following example displays the interface details for the source port CBR 0/1/0 (shown in Figure 18-5), using the showcescircuitinterface cbr 0/1/0 1 command:

CESwitch# show ces circuit interface cbr 0/1/0 1
 
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7
Channels used by this circuit: 1-3,7
Cell-Rate: 697, Bit-Rate 256000
cas ON, cell_header 0x100 (vci = 16)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
Active SoftVC 
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040

Note that the seventh line of the output shows that CAS in now ON.

The following example displays the interface details for the destination port (CBR 0/1/1) (shown in Figure 18-5), using the show ces circuit interface cbr 0/1/1 1 command:

CESwitch# show ces circuit interface cbr 0/1/1 1
 
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / 
Interface CBR0/1/1, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 697, Bit-Rate 256000
cas ON, cell_header 0x4100 (vci = 1040)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       57, startDequeueDepth       40
Partial Fill:       47, Structured Data Transfer 1
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0, vci 1040
Dst: atm addr default vpi 0, vci 0

Note that the seventh line of the output shows that CAS in now ON.

Configuring a Soft PVC for Structured CES with CAS and On-Hook Detection Enabled

This section outlines the additional steps that you must take to activate the on-hook detection (bandwidth-release) feature in a 1 x 64 structured CES circuit.

To configure a soft PVC for structured CES with CAS and on-hook detection enabled, follow these steps, beginning in global configuration mode:

Step Command Purpose

1 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

2 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

3 .

ces circuit {1-24} cas [cdv 1-65535 | circuit-name name | on-hook-detect 0-F | partial-fill 20-47 | shutdown]

Configures on-hook detection on the CES circuit.

4 .

no shutdown

Enables the interface.

Example

The following example shows how to configure on-hook detection on the soft PVC with structured CES and CAS enabled in the previous section "Configuring a Soft PVC for Structured CES with CAS Enabled" (shown in Figure 18-5):

CESwitch(config)# interface cbr 0/1/0
CESwitch(config)# shutdown
CESwitch(config-if)# ces circuit 1 cas on-hook-detect 2
CESwitch(config)# no shutdown

Note The four ABCD bits in the CAS mechanism are device-specific, depending on the manufacturer of the voice/video telephony device that generates the CBR traffic. The ABCD bits of the CAS mechanism are user-configurable.

Verifying a Soft PVC for Structured CES with CAS and On-Hook Detection Enabled

To show the on-hook detection configuration of a soft PVC configured with structured CES and CAS enabled, use the following EXEC command:

Command Purpose

show ces circuit interface card/subcard/port circuit_id

Shows the detailed interface configuration information for the soft PVC.

Example

The following example shows the soft PVC with CAS and on-hook detection enabled as hexadecimal number 2 (shown in Figure 18-5):

CESwitch# show ces circuit interface CBR0/1/0 1
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / Interface CBR3/0/1, Circuit_id
 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 697, Bit-Rate 256000
cas ON, cell_header 0x4100 (vci = 1040)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable
ErrTolerance 8, idleCircuitdetect ON, onHookIdleCode 0x2
state: VcInactive, maxQueueDepth        0, startDequeueDepth        0
Partial Fill:       47, Structured Data Transfer 98
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0040.0b0a.2b81.4000.0c82.0034.10 vpi 0, vci 1040
Dst: atm addr default

Creating Multiple Structured Soft PVCs on the Same CES Port

This section describe how to create more than one structured soft PVC on the same CES T1/E1 port. Figure 18-6 shows how you can configure multiple CES circuits on a single T1/E1 port.

Assume that certain configuration information has already been established for a soft PVC (see Figure 18-5) and that you are to create an additional soft PVC involving the same CES module.

The following assumptions apply to creating multiple soft PVCs on the same T1/E1 port (see Figure 18-6):

The source (active) side of a soft PVC named CBR-PVC-A is already created on port CBR 0/1/0.
The destination (passive) side of a soft PVC named CBR-PVC-B is already created on port CBR 0/1/1.
A new source (active) side of a soft PVC named CBR-PVC-AC will be created on port CBR 0/1/0 of the CES module, thereby creating a multiple CES circuit on this particular port.
A new destination (passive) side of a soft PVC named CBR-PVC-CA will be created on port CBR 0/1/2 of the CES module.

Figure 18-6: Configuring Multiple Structured Soft PVCs on the Same CES T1/E1 Port

Configuring multiple soft PVCs for structured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of Multiple Soft PVCs

To configure multiple soft PVCs on the destination (passive) side of the same port, follow these steps, beginning in global configuration mode:

Step Command Purpose

1 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

2 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

3 .

ces dsx1 clock source {free-running | loop-timed | network-derived}

Configures the DSX-1 clock source.

4 .

ces dsx1 framing {esf | sf}

Configures the DSX-1 framing type.

5 .

ces dsx1 linecode {ami | b8zs}

Configures the DSX-1 line code type.

6 .

ces aal1 service structured

Configures the AAL1 service type.

7 .

ces aal1 clock {adaptive | srts | synchronous}

Configures the AAL1 clock mode.

8 .

ces circuit {1-24} timeslots {1-24}

Configures the CES interface circuit identifier and specifies the timeslot(s) that will comprise the CES-IWF circuit.
Note For structured service, use 1-24, not 0, for the circuit identifier. The 0 circuit identifier is reserved for unstructured service.

9 .

ces circuit {1-24} circuit-name name

Configures the CES interface circuit identifier and circuit name.

10 .

no shutdown

Enables the interface.

Example

The following example shows how to configure multiple soft PVCs on the destination (passive) side of the same port (shown in Figure 18-6):

CESwitch(config)# interface cbr 0/1/2
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces dsx1 clock source network-derived 
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces circuit 1 timeslots 10 circuit-name CBR-PVC-CA
CESwitch(config-if)# no shutdown

Note In the synchronous clocking mode, the PRS is always derived from the networking environment. You must set the CBR port to use this clocking signal for synchronizing CBR data transport.

If you do not explicitly specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR0/1/0:1. For structured circuit emulation services, the circuit number sequence always begins at 1 for each port in a CES module.

Phase 2---Configuring the Source (Active) Side of Multiple Soft PVCs

To configure multiple soft PVCs on the source (active) side of the same port, follow these steps, beginning in global configuration mode:

Step Command Purpose

1 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

2 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

3 .

ces circuit {1-24} timeslots {1-24}

Configures the CES interface circuit identifier and specifies the timeslot(s) that will comprise the CES-IWF circuit.
Note For structured service, use 1-24, not 0, for the circuit identifier. The 0 circuit identifier is reserved for unstructured service.

4 .

ces circuit {1-24} circuit-name name

Configures the CES interface circuit identifier and circuit name.

5 .

no shutdown

Enables the interface.

6 .

^Z

Exits interface configuration mode.

7 .

show ces address

Shows the CES address for the destination end of the circuit.

8 .

configure terminal

At the privileged EXEC prompt, enters configuration mode from the terminal.

9 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

10 .

shutdown

Shuts down the selected interface.
Note Because you cannot change a circuit's configuration while the circuit is up, you must first shutdown the interface.

11 .

ces pvc 1 dest-address remote_atm_address vpi 0-4095 vci 1-16383

Configures the soft PVC to the destination CES-IWF ATM addresses and VPI/VCI of the circuit.

12 .

no shutdown

Enables the interface.

Example

The following example shows how to configure multiple soft PVCs on the source (active) side of the same port (shown in Figure 18-6):

CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces circuit 2 timeslots 24
CESwitch(config-if)# ces circuit 2 circuit-name CBR-PVC-AC
CESwitch(config-if)# no shutdown
CESwitch(config-if)# interface cbr 0/1/0
CESwitch(config-if)# ^Z
CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.20  CBR-PVC-AC
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10  CBR-PVC-CA
 
CESwitch# configure terminal 
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces pvc 2 dest-address 
 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10  vpi 0 vci 2064
CESwitch(config-if)# no shutdown

Verifying the Creation of Multiple Structured Soft PVCs on the Same CES Port

To verify multiple structured soft PVCs with CAS enabled, use the following EXEC commands:

Command Purpose

show ces address

Shows the CES address for the destination end of the circuit.

show ces circuit

Shows the configuration information for the soft PVC.

show ces circuit interface card/subcard/port circuit_id

Shows the detailed interface configuration information for the soft PVC.

Examples

The following example displays the circuit details for the soft PVCs that you created in the previous procedure (shown in Figure 18-6) using the show ces circuit command in privileged EXEC mode:

CESwitch# show ces circuit 
Interface	Circuit	Circuit-Type	 X-interface	 X-vpi	 X-vci 	Status
 CBR0/1/0	1	Active SoftVC	UNKNOWN	0	0	UP
 CBR0/1/0	2	Active SoftVC		UNKNOWN		0		0		UP
 CBR0/1/1	1	Passive SoftVC		UNKNOWN		0		0		UP
 CBR0/1/2	1	Passive SoftVC		UNKNOWN		0		0		UP

The following example displays the CES-IWF addresses of the soft PVCs that you configured (shown in Figure 18-6), using the showcesaddress command in privileged EXEC mode:

CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.20  CBR-PVC-AC
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10  CBR-PVC-CA

The following example displays the interface details for the new circuit 2 soft PVC that you set up on port CBR 0/1/0 (shown in Figure 18-6), using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 0/1/0 2
Circuit: Name CBR-PVC-AC, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 2, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7,24
Channels used by this circuit: 24
Cell-Rate: 171, Bit-Rate 64000
cas OFF, cell_header 0x200 (vci = 32)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth      128, startDequeueDepth      111
Partial Fill:       47, Structured Data Transfer 1
Active SoftVC 
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.20 vpi 0, vci 32
Dst: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10 vpi 0, vci 2064

The show ces circuit interface cbr command displays the interface details pertaining to circuit 2 of the multiple CES soft PVC previously set up on port 0 of the CES module.

The following example displays the interface details for the new circuit 1 soft PVC that you configured on port CBR0/1/2 (shown in Figure 18-6), using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 0/1/2 1
Circuit: Name CBR-PVC-CA, Circuit-state ADMIN_UP / 
Interface CBR0/1/2, Circuit_id 1, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10
Channels used by this circuit: 10
Cell-Rate: 171, Bit-Rate 64000
cas OFF, cell_header 0x8100 (vci = 2064)
cdv 2000 usecs, Measured cdv -1 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth      128, startDequeueDepth      111
Partial Fill:       47, Structured Data Transfer 1
Passive SoftVC
Src: atm addr 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10 vpi 0, vci 2064
Dst: atm addr default vpi 0, vci 0

Reconfiguring a Previously Established PVC

Once you have configured a PVC, you cannot change the circuit's configuration while the circuit is up. You must first bring the interface down. Then you can change the circuit's configuration. After entering these configuration changes you must bring the interface back up. To change an enabled circuit's configuration, follow these steps:

.

Step Command Purpose

1 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

2 .

shutdown

Disables the CES interface.

3 .

Enter the command for the configuration parameter to be changed.

For example, to specify the DSX-1 clock source as network-derived and to change the AAL1 clocking mode from adaptive to synchronous, enter:

ces dsx1 clock source network-derived

ces aal1 clock synchronous

Configures the DSX-1 clock source as network-derived and reconfigures the AAL1 clock mode to synchronous.

4 .

no shutdown

Enables the CES interface.

5 .

show ces circuit interface cbr card/subcard/port circuit_id

Shows detailed interface configuration information for the PVC.

Use this command to verify your configuration changes.

Note The no ces circuit (n) shutdown command deletes the circuit. If you use this command, you must reenter all of the configuration information for the circuit. Do not use this command unless you intend to delete the circuit.

Examples

The following example disables interface cbr 0/1/0, specifies the DSX-1 clock source as network-derived, changes the AAL1 clock mode to synchronous, and reenables the interface.

CESwitch# interface cbr 0/1/0
CESwitch#(config-if)# shutdown
CESwitch#(config-if)# ces dsx1 clock source network-derived 
CESwitch#(config-if)# ces aal1 clock synchronous
CESwitch#(config-if)# no shutdown

The following example displays the changed configuration information for the PVC, using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 0/1/0 0
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / 
Interface CBR0/1/0, Circuit_id 0, Port-Type T1, Port-State UP 
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
cdv 2000 usecs, Measured cdv 350 usecs
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      879, startDequeueDepth      491
Partial Fill:       47, Structured Data Transfer 0
HardPVC       
src: CBR0/1/0 vpi 0, vci 16
Dst: ATM0/0/0 vpi 0, vci 100

The output from this command verifies the following configuration information:

The circuit named CBR-PVC-A is UP.
The DSX-1 clock source is network-derived.
The AAL1 clock mode is synchronous.

Deleting a Previously Established PVC

This section describes how to delete the a previously established PVC.

To delete a previously established PVC, follow these steps, beginning in privileged EXEC mode:

Step Command Purpose

1 .

show ces circuit

Shows the configuration information for the PVC.

2 .

configure terminal

At the privileged EXEC prompt, enters global configuration mode from the terminal.

3 .

interface cbr card/subcard/port

Selects the physical interface where the PVC is to be deleted.

4 .

no ces circuit 0

Deletes the CES circuit.

5 .

exit

Exits interface configuration mode.

6 .

interface cbr card/subcard/port

Selects the other physical interface where the PVC is to be deleted.

7 .

no ces circuit 0

Deletes the other end of CES circuit.

Example

The following example shows how to delete a previously established PVC:

CESwitch# show ces circuit               
 
Interface	Circuit	Circuit-Type 	X-interface 	X-vpi	 X-vci 	Status
CBR1/0	0	HardPVC	ATM0/0	0	100	UP
CBR1/1	0	HardPVC	ATM0/0	0	101	UP
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 0/1/0
CESwitch(config-if)# no ces circuit 0
CESwitch(config-if)# exit
CESwitch(config)# interface cbr 0/1/1
CESwitch(config-if)# no ces circuit 0
CESwitch(config-if)# end

Verifying Deletion of a Previously Established PVC

To verify the deletion of a previously configured PVC, use the following commands, from privileged EXEC mode:

Command Purpose

show ces circuit

Shows the configuration information for the PVC.

show ces address

Shows the configuration information for any CES addresses.

Examples

The following example displays the configuration of any CES circuits:

CESwitch# show ces circuit

The absence of output verifies that all CES circuits are deleted.

The following example displays the configuration of any CES addresses:

CESwitch# show ces address
 
CES-IWF ATM Address(es):

The absence of output verifies that all CES circuits are deleted.

Configuring SGCP

The Simple Gateway Control Protocol (SGCP) controls voice-over-IP gateways by an external call control element (called a call-agent). This has been adapted to allow SGCP to control ATM switch router circuit emulation service (CES) circuits (called endpoints in SGCP). The resulting system (call-agents and gateways) allows for the call-agent to engage in common channel signalling (CCS) over a 64-Kbps CES circuit, governing the interconnection of bearer channels on the CES interface. In this system the ATM switch router acts as a voice-over-ATM gateway.

For overview information about configuring the SCGP feature, refer to the Guide to ATM Technology.

Operation

The network operator can globally enable or disable SGCP operation for the switch. By default, SGCP is disabled. When SGCP is enabled, the ATM switch router begins listening on the well-known User Datagram Protocol (UDP) port for SGCP packets. The endpoint ID in an SGCP packet identifies the CES circuit. The CES circuit endpoint can be used by SGCP if the following conditions exist:

The parent CES interface is enabled, and the LineState is NoAlarm (determined via the show ces interface command).
The CES circuit is allocated a single time slot.
The CES circuit is enabled (not shut).
The CES circuit is not configured as an active soft PVC.
The CES circuit is not configured as part of a hard PVC.

The following sections describe SGCP configuration tasks:

Configuring SGCP on the Entire Switch

To enable SGCP operations for the entire switch, use the global configuration command, as shown in the following table:

Command Purpose

sgcp

Enables or disables SGCP operations for the entire switch.

Example

The following example shows how to enable SGCP for the entire switch:

Switch(config)# sgcp

Displaying SGCP

To display SGCP configuration, operational state, and a summary of connection activity, use the following privileged EXEC command:

Command Purpose

show sgcp

Displays the global SGCP configuration.

Example

The following example displays the SGCP configuration:

Switch# show sgcp
 
SGCP Admin State ACTIVE, Oper State ACTIVE
SGCP call-agent:none  , SGCP graceful-shutdown enabled? FALSE
SGCP request timeout 2000, SGCP request retries 6
74 CES endpoint connections created
74 CES endpoints in active connections

Configuring CES Circuits for SGCP

Any single time slot (64 Kbps) allocated to a circuit on a CES T1 or E1 interface can be configured for SGCP with these restrictions:

CES is not the active source end of a soft PVC.
CES is not part of a hard PVC.

Note Configuration on the call-agent can restrict the range of circuits designated for signalling on a CES circuit interface.

When you configure a CES circuit for SGCP, signalling should be given the proper time slot. For T1 CES circuits, a time slot can be given a number from 1 to 24; for E1 CES, a number from 1 to 31.

Although no keyword identifies a CES circuit as allocatable by SGCP, there is normally a simple configuration rule to ensure that signalling allocates the proper time slot:

: circuit x is allocated time slot x, 1<=x<=24 (or 31 for E1).

Note The endpoint specifier used by SGCP refers to the CES circuit ID (not the time slot). If a time slot is not allocated to a circuit, that time slot cannot be used by SGCP (or CES, either).

To configure SGCP operation on a CES circuit interface, follow these steps, beginning in global configuration mode:

Step Command Purpose

1 .

interface cbr card/subcard/port

Selects the physical interface to be configured.

2 .

ces aal1 service structured

Configures the AAL1 service type.

3 .

ces circuit circuit_id timeslot timeslot_#

Allocates timeslot number to circuit identifier.

Example

The following example shows how to configure the CES port for structured CES with all timeslots available for SGCP. CES circuit 16 is configured for common channel signalling and specified as a soft PVC to a circuit on the CES port adapter connected to the call-agent.

Switch(config)# interface CBR1/1/2
Switch(config-if)# ces aal1 service structured
Switch(config-if)# ces circuit 1 timeslot 1
Switch(config-if)# ces circuit 2 timeslot 2
Switch(config-if)# ces circuit 3 timeslot 3
Switch(config-if)# ces circuit 4 timeslot 4
Switch(config-if)# ces circuit 5 timeslot 5
Switch(config-if)# ces circuit 6 timeslot 6
Switch(config-if)# ces circuit 7 timeslot 7
Switch(config-if)# ces circuit 8 timeslot 8
Switch(config-if)# ces circuit 9 timeslot 9
Switch(config-if)# ces circuit 10 timeslot 10
Switch(config-if)# ces circuit 11 timeslot 11
Switch(config-if)# ces circuit 12 timeslot 12
Switch(config-if)# ces circuit 13 timeslot 13
Switch(config-if)# ces circuit 14 timeslot 14
Switch(config-if)# ces circuit 15 timeslot 15
Switch(config-if)# ces circuit 16 timeslot 16
Switch(config-if)# ces pvc 16 dest-address
47.0091.8100.0000.0060.3e64.fd01.4000.0c80.1038.10 vpi 0 vci 2064
Switch(config-if)# ces circuit 17 timeslot 17
Switch(config-if)# ces circuit 18 timeslot 18
Switch(config-if)# ces circuit 19 timeslot 19
Switch(config-if)# ces circuit 20 timeslot 20
Switch(config-if)# ces circuit 21 timeslot 21
Switch(config-if)# ces circuit 22 timeslot 22
Switch(config-if)# ces circuit 23 timeslot 23
Switch(config-if)# ces circuit 24 timeslot 24
Switch(config-if)# end

Displaying SGCP Endpoints

SGCP endpoints are all the CES circuits that might be eligible for SGCP connections. To display SGCP endpoints, use the following EXEC command:

Command Purpose

show sgcp endpoint [interface cbr card/subcard/port [circuit_id]]

Displays the SGCP endpoints.

Note SGCP cannot allocate a CES circuit to a connection if it is already part of a hard or soft PVC.

Example

The following example displays the possible SGCP endpoints on CES interface CBR 1/1/0:

Switch> show sgcp endpoint interface cbr1/1/0
 
Endpt         Timeslots Conn State            Call ID
CBR1.1.0/1         1    no connection
CBR1.1.0/2         1    no connection
CBR1.1.0/3         1    no connection
CBR1.1.0/4         1    no connection
CBR1.1.0/5         1    no connection
CBR1.1.0/6         1    no connection
CBR1.1.0/7         1    no connection
CBR1.1.0/8         1    no connection
CBR1.1.0/9         1    no connection
CBR1.1.0/10        1    no connection
CBR1.1.0/11        1    active
CBR1.1.0/12        1    no connection
CBR1.1.0/14        1    active             1234abc
CBR1.1.0/15        1    active             2234abc
CBR1.1.0/16        1    active             3234abc
CBR1.1.0/17        1    active             4234abc
CBR1.1.0/18        1    active             5234abc
CBR1.1.0/19        1    active             6234abc
CBR1.1.0/20        1    active             7234abc
CBR1.1.0/21        1    active             8234abc
CBR1.1.0/22        1    active             9234abc
CBR1.1.0/23        1    active             a234abc
CBR1.1.0/24        1    active             b234abc

Displaying SGCP Connections

To display SGCP connections (either globally or per single interface), use the following EXEC command:

Command Purpose

show sgcp connection [interface cbr card/subcard/port]

Displays the SGCP connections.

Example

The following example displays all SGCP connections created on the ATM switch router:

Switch> show sgcp connection
 
Conn Endpt          Soft VC State        Call Id
CBR0.0.0/1         Dest- active VC       d234ab
CBR0.0.0/2         Dest- active VC       12345bc
CBR0.0.0/3         Dest- active VC       1284ab
CBR0.0.0/4         Dest- active VC       9234abc

Configuring SGCP Request Handling

When the ATM switch router initiates an SGCP request (for example, to disconnect the circuit), default request timer and request retry values are in operation. To change the default value of SGCP requests, use the global configuration commands, as shown in the following table:

Command Purpose

sgcp request timeout timeval

Configures the SGCP request timeout value.

sgcp request retries retryval

Configures the SGCP request retry value.

Examples

The following example shows how to change the request timeout to 2000 milliseconds:

Switch(config)# sgcp request timeout 2000

The following example shows how to change the request retry value to 5:

Switch(config)# sgcp request retries 5

Configuring Call-Agent Address

By default the SGCP call agents perform the following tasks:

The ATM switch router sends a response to an SGCP request in a UDP packet with the destination address the same as the source address of the request UDP packet.
To send a DeleteConnection request for a connection that exists, the ATM switch router specifies the destination address of the UDP packet as the source UDP address in the CreateConnection request.

To alter this behavior, and send responses and requests to a specific IP address and UDP port, use the following global configuration command:

Command Purpose

sgcp call-agent host_IPaddr UDP_port

Configures the call-agent IP address and UDP port.

Note If the IP address is specified without the UDP port number, the well-known SGCP port 2427 is used.

Example

The following example shows how to set the call-agent with IP address 133.20.5.122 and UDP port 12000:

Switch(config)# sgcp call-agent 133.20.5.122 12000

Shutting Down SGCP

When SGCP is disabled with the no sgcp command, active SGCP connections are terminated; however DeleteConnection requests are not sent to the call-agent for these active connections. To notify call-agent and perform a graceful SGCP shutdown, use the following global configuration command:

Command Purpose

sgcp graceful-shutdown

Shuts down SGCP and notifies call-agent.

Example

The following example shows how to perform a graceful shutdown:

Switch(config)# sgcp graceful-shutdown

Command	Purpose
show ces circuit	Shows the configuration information for the PVC.
show ces address	Shows the configuration information for any CES addresses.

Command	Purpose
sgcp request timeout timeval	Configures the SGCP request timeout value.
sgcp request retries retryval	Configures the SGCP request retry value.

Table of Contents

Configuring Circuit Emulation Services

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