Configuring Virtual Connections

This chapter describes how to configure virtual connections (VCs) in a typical ATM network after autoconfiguration has established the default network connections. The network configuration modifications described in this chapter are used to optimize your ATM network operation.

The tasks to configure virtual connections are described in the following sections:

Note For a complete description of the commands mentioned in this chapter, refer to the Catalyst 8540 MSR Command Reference publication.

Characteristics and Types and of Virtual Connections

The characteristics of the VC, established when the VC is created, include the following:

Quality of service (QoS)
ATM adaptation layer 5 (AAL5)
Peak and average transmission rates
Cell sequencing integrity

You can disable these switching features on a per-interface basis; you must explicitly enable autonomous switching per interface.

Table 5-1 list the types of supported VCs.

Connection	Point-to- Point	Point-to- Multipoint	Transit	Terminate
Permanent virtual channel link (PVCL)	3	3	---	---
Permanent virtual path link (PVPL)	3	3	---	---
Permanent virtual channel (PVC)	3	3	3	3
Permanent virtual path (PVP)	3	3	3	---
Soft permanent virtual channel (Soft PVC)	3	---	3	---
Soft permanent virtual path (Soft PVP)	3	---	3	---
Switched virtual circuit (SVC)	3	3	3	3
Switched virtual path (SVP)	3	3	3	---

Table 5-1: Suppo rted VC Types

Connection Point-to-
Point Point-to-
Multipoint Transit Terminate

Permanent virtual channel link (PVCL)

3

3

---

---

Permanent virtual path link (PVPL)

3

3

---

---

Permanent virtual channel (PVC)

3

3

3

3

Permanent virtual path (PVP)

3

3

3

---

Soft permanent virtual channel (Soft PVC)

3

---

3

---

Soft permanent virtual path (Soft PVP)

3

---

3

---

Switched virtual circuit (SVC)

3

3

3

3

Switched virtual path (SVP)

3

3

3

---

Configuring Permanent Virtual Channel Connections

This section describes configuring VCCs on the ATM switch router. A VCC is established as a bidirectional facility to transfer ATM traffic between two ATM layer users. Figure 5-1 shows an example VCC between ATM user A and user D.

An end-to-end VCC, as shown in Figure 5-1 between user A and user D, has two parts:

Virtual channel links, labelled VCL. These are the interconnections between switches, either directly or through VP tunnels.
Internal connections, shown by the dotted line in the switch. These connections are also sometimes called cross-connections or cross-connects.

The common endpoint between an internal connection and a link occurs at the switch interface. The endpoint of the internal connection is also referred to as a connection leg or half-leg. A cross-connect connects two legs together.

Figure 5-1: Virtual Channel Connection Example

Note The value of the VPIs and VCIs can change as the traffic is relayed through the ATM network.

To configure a point-to-point VCC, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm pvc vpi-A [vci-A | any-vci¹] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt #] vpi-B [vci-B | any-vci]

Configure the PVC.

¹The any-vci parameter is only available for interface atm0.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm pvc vpi-A [vci-A \| any-vci¹] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt #] vpi-B [vci-B \| any-vci]	Configure the PVC.

Note The row index for rx-cttr and tx-cttr must be configured before using this optional parameter. See the section "Configure the Connection Traffic Table" in the chapter "Configuring Resource Management."

Note When configuring PVC connections, begin with lower VCI numbers. Using low VCI numbers allows more efficient use of the switch fabric resources.

Examples

The following example shows how to configure the internal cross-connect PVC on Switch B between interface 3/0/1, VPI = 0, VCI = 50, and interface 3/0/2, VPI = 2, VCI = 100 (see Figure 5-1):

Switch-B(config)# interface atm 3/0/1
Switch-B(config-if)# atm pvc 0 50 interface atm 3/0/2 2 100

The following example shows how to configure the internal cross-connect PVC on Switch C between interface 0/0/0, VPI = 2, VCI = 100, and interface 0/0/1, VPI 50, VCI = 255:

Switch-C(config)# interface atm 0/0/0
Switch-C(config-if)# atm pvc 2 100 interface atm 0/0/1 50 255

Each subsequent VC cross-connection and link must be configured until the VC is terminated to create the entire VCC.

Note The above examples show how to configure cross-connections using one command. This is the preferred method, but it is also possible to configure each leg separately, then connect them with the atm pvc vpi vci interface atm card/subcard/port vpi vci command. This alternative method requires more steps, but may be convenient if each leg has many additional configuration parameters or if you have configured individual legs with SNMP commands and you want to connect them with one CLI command.

The following example shows how to configure the route processor (CPU) leg of any terminating PVC:

Switch(config)# interface atm0
Switch(config-if)# atm pvc 0 any-vci

When configuring the route processor leg of a PVC that is not a tunnel, the VPI should be configured as 0. The preferred method of VCI configuration is to select the any-vci parameter, unless a specific VCI is needed as a parameter in another command, such as map-list.

Note If configuring a specific VCI value for the route processor leg, select a VCI value higher than 300. This step prevents a conflict with automatically assigned VCIs for well-known channels if the ATM switch router reboots.

Display Virtual Channel Connections

To show the VC configuration, use the following EXEC commands:

Command Task

show atm interface [atm card/subcard/port]

Show the ATM interface configuration.

show atm vc [interface atm card/subcard/port vpi vci]

Show the PVC interface configuration.

Command	Task
show atm interface [atm card/subcard/port]	Show the ATM interface configuration.
show atm vc [interface atm card/subcard/port vpi vci]	Show the PVC interface configuration.

Examples

The following example shows the Switch B PVC configuration on ATM interface 3/0/1:

Switch-B# show atm interface
 
Interface:      ATM3/0/1        Port-type:    oc3suni
IF Status:      UP              Admin Status:   up
Auto-config:    enabled         AutoCfgState:   completed
IF-Side:        Network         IF-type:        NNI
Uni-type:       not applicable  Uni-version:    not applicable
Max-VPI-bits:   8               Max-VCI-bits:   14
Max-VP:         255             Max-VC:         16383
ConfMaxSvpcVpi: 255             CurrMaxSvpcVpi: 255
ConfMaxSvccVpi: 255             CurrMaxSvccVpi: 255
ConfMinSvccVci: 35              CurrMinSvccVci: 35
Svc Upc Intent: pass            Signalling:     Enabled
ATM Address for Soft VC: 47.0091.8100.0000.00e0.4fac.b401.4000.0c80.8000.00
Configured virtual links:
  PVCLs SoftVCLs   SVCLs   TVCLs   PVPLs SoftVPLs   SVPLs Total-Cfgd Inst-Conns
      4        0       0       0       0        0       0          4          2
Logical ports(VP-tunnels):     0
Input cells:    264330          Output cells:   273471
5 minute input rate:             0 bits/sec,       0 cells/sec
5 minute output rate:            0 bits/sec,       0 cells/sec
Input AAL5 pkts: 172613, Output AAL5 pkts: 177185, AAL5 crc errors: 0

The following example shows the Switch B PVC configuration on ATM interface 3/0/1:

Switch-B# show atm vc interface atm 3/0/1
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM3/0/1     0     5      PVC     ATM00     57    QSAAL  UP
ATM3/0/1     0     16     PVC     ATM0 0     37    ILMI   UP
ATM3/0/1     0     18     PVC     ATM0 0     73    PNNI   UP
ATM3/0/1     0     50     PVC     ATM3/0/2     2     100          UP
ATM3/0/1     1     50     PVC     ATM0 0     80    SNAP   UP

The following example shows the Switch B PVC configuration on ATM interface 3/0/1, VPI = 0, VCI=50, with the switch processor feature card installed:

Switch-B# show atm vc interface atm 3/0/1 0 50
 
Interface: ATM3/0/1, Type: oc3suni
VPI = 0  VCI = 50
Status: UP
Time-since-last-status-change: 4d02h
Connection-type: PVC
Cast-type: point-to-point
Packet-discard-option: disabled
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM3/0/2, Type: oc3suni
Cross-connect-VPI = 2
Cross-connect-VCI = 100
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Configuring Terminating PVC Connections

This section describes configuring point-to-point and point-to-multipoint terminating PVC connections. Terminating connections provide the connection to the ATM switch router's route processor for LAN Emulation (LANE), IP over ATM, and control channels for Integrated Local Management Interface (ILMI), signalling, and Private Network-to-Network Interface (PNNI) plus network management.

Figure 5-2 shows an example of transit and terminating connections.

Figure 5-2: Terminating Virtual Connection Types

Point-to-point and point-to-multipoint are two types of terminating connections. Both terminating connections are configured using the same commands as transit connections (discussed in the previous sections). However, all switch terminating connections use interface atm0 to connect to the route processor.

To configure both point-to-point and point-to-multipoint terminating PVC connections, perform the following steps, beginning in global configuration mode

Step Command Task

1
interface atm card-A/subcard-A/port-A[.vpt #]

Select the interface to be configured.

2
atm pvc vpi-A [vci-A | any-vci¹] [cast-type type] [rx-cttr index] [tx-cttr index] interface atm card-B/subcard-B/port-B[.vpt #] vpi-B [vci-B | any-vci²] [encap type] [cast-type type]

Configure the PVC between ATM switch router connections.

¹The any-vci feature is only available for interface atm0.

:

Step	Command	Task
1	interface atm card-A/subcard-A/port-A[.vpt #]	Select the interface to be configured.
2	atm pvc vpi-A [vci-A \| any-vci¹] [cast-type type] [rx-cttr index] [tx-cttr index] interface atm card-B/subcard-B/port-B[.vpt #] vpi-B [vci-B \| any-vci²] [encap type] [cast-type type]	Configure the PVC between ATM switch router connections.

When configuring point-to-multipoint PVC connections using the atm pvc command, the root point is port A and the leaf points are port B.

Examples

The following example shows how to configure the internal cross-connect PVC between interface 3/0/1, VPI = 1, VCI =50, and the terminating connection at the route processor interface atm0, VPI = 0, and VCI unspecified:

Switch-B(config)# interface atm 3/0/1
Switch-B(config-if)# atm pvc 1 50 interface atm0 0 any-vci encap aal5snap

The following example shows how to configure the route processor leg of any terminating PVC:

Switch(config)# interface atm0
Switch(config-if)# atm pvc 0 any-vci

Note If configuring a specific VCI value for the route processor leg, select a VCI value higher than 300 to prevent a conflict with an automatically assigned VCI for well-known channels if the ATM switch router reboots.

Display the Terminating PVC Connections

To display the terminating PVC configuration, use the following EXEC commands:

Command Task

show atm vc card/subcard/port

Show the ATM interface configuration.

show atm vc interface atm card/subcard/port vpi vci

Show the PVC interface configuration.

Command	Task
show atm vc card/subcard/port	Show the ATM interface configuration.
show atm vc interface atm card/subcard/port vpi vci	Show the PVC interface configuration.

See the section "Display Virtual Channel Connections" for examples of the show atm vc commands.

Configuring Permanent Virtual Path Connections

This section describes configuring a PVP connection. Figure 5-3 shows an example of PVPs configured through the ATM switch routers.

Figure 5-3: Virtual Path Connection Example

To configure a PVP connection, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the physical interface to be configured.

2
atm pvp vpi-A [rx-cttr index] [tx-cttr index] interface card/subcard/port vpi-B

Configure the interface PVP.

Step	Command	Task
1	interface atm card/subcard/port	Select the physical interface to be configured.
2	atm pvp vpi-A [rx-cttr index] [tx-cttr index] interface card/subcard/port vpi-B	Configure the interface PVP.

Note When configuring PVP connections, begin with lower VPI numbers. Using low VPI numbers allows more efficient use of the switch fabric resources.

Examples

The following example shows how to configure the internal cross-connect PVP within Switch B between interfaces 3/0/1, VPI = 1, and interface 3/0/2, VPI = 2:

Switch-B(config)# interface atm 3/0/1
Switch-B(config-if)# atm pvp 1 interface atm 3/0/2 2

The following example shows how to configure the internal cross-connect PVP within Switch C between interfaces 0/0/0, VPI = 2, and interface 0/0/1, VPI = 50:

Switch-C(config)# interface atm 0/0/0
Switch-C(config-if)# atm pvp 2 interface atm 0/0/1 50

Each subsequent PVP cross connection and link must be configured until the VP is terminated to create the entire PVP.

Display the Virtual Path Connection

To show the ATM interface configuration, use the following EXEC command:

Command Task

show atm vp [interface atm card/subcard/port vpi]

Show the ATM VP configuration.

Command	Task
show atm vp [interface atm card/subcard/port vpi]	Show the ATM VP configuration.

Example

The following example shows the PVP configuration of Switch B:

Switch-B# show atm vp
Interface    VPI    Type  X-Interface     X-VPI     Status
ATM3/0/1 1 PVP ATM3/0/2 2 UP

The following example shows the PVP configuration of Switch B with the switch processor feature card installed:

Switch-B# show atm vp interface atm 3/1/0 1
 
Interface: ATM3/1/0, Type: oc3suni
VPI = 1
Status: TUNNEL
Time-since-last-status-change: 4d22h
Connection-type: PVP
Cast-type: point-to-point
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM3/0/2, Type: oc3suni
Cross-connect-VPI = 2
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Configuring Point-to-Multipoint PVC Connections

This section describes configuring point-to-multipoint PVC connections. In Figure 5-4, cells entering the ATM switch router at the root point (on the left side at interface 0/0/0, VPI = 50, VCI = 100) are duplicated and switched to the leaf points (output interfaces) on the right side of the figure.

Figure 5-4: Point-to-Multipoint PVC Example

Note If desired, one of the leaf points can terminate in the ATM switch router at the route processor interface atm0.

To configure the point-to-multipoint PVC connections shown in Figure 5-4, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port [.vpt #]

Select the interface to be configured.

2
atm pvc vpi-A vci-A [cast-type type-A] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt #] vpi-B vci-B [cast-type type]

Configure the PVC between ATM switch router connections.

Step	Command	Task
1	interface atm card/subcard/port [.vpt #]	Select the interface to be configured.
2	atm pvc vpi-A vci-A [cast-type type-A] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt #] vpi-B vci-B [cast-type type]	Configure the PVC between ATM switch router connections.

To configure the point-to-multipoint PVC connections using the atm pvc command, the root point is port A and the leaf points are port B.

Examples

The following example shows how to configure the root-point PVC on ATM switch router interface 0/0/0, VPI = 50, VCI =100, to the leaf-point interface 0/1/0, VPI = 60, VCI = 200 (see Figure 5-4):

Switch(config)# interface atm 0/0/0
Switch(config-if)# atm pvc 50 100 cast-type p2mp-root interface atm 0/1/0 60 200 cast-type p2mp-leaf

Display Point-to-Multipoint PVC Configuration

To display the point-to-multipoint PVC configuration, use the following EXEC mode commands:

Command Task

show atm vc card/subcard/port

Show the ATM interface configuration.

show atm vc interface atm card/subcard/port vpi vci

Show the PVC interface configuration.

Command	Task
show atm vc card/subcard/port	Show the ATM interface configuration.
show atm vc interface atm card/subcard/port vpi vci	Show the PVC interface configuration.

Examples

The following example shows the point-to-multipoint PVC configuration on interface 0/0/1:

Switch# show atm vc interface atm 0/0/0
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM0/0/0     0     5      PVC     ATM0 0     56    QSAAL  UP
ATM0/0/0     0     16     PVC     ATM0 0     36    ILMI   UP
ATM0/0/0     50    100    PVC     ATM0/1/0 60    200          UP
                                  ATM0/1/1 70    210          UP
                                  ATM0/1/2 80    220          UP

The following example shows the VC configuration on interface 0/0/0, VPI = 50, VCI = 100, with the switch processor feature card installed:

Switch# show atm vc interface atm 0/0/0 50 100
 
Interface: ATM0/0/0, Type: oc3suni
VPI = 50  VCI = 100
Status: UP
Time-since-last-status-change: 00:07:06
Connection-type: PVC
Cast-type: point-to-multipoint-root
Packet-discard-option: disabled
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM0/1/0, Type: oc3suni
Cross-connect-VPI = 60
Cross-connect-VCI = 200
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Cross-connect-interface: ATM0/1/1
Cross-connect-VPI = 70
Cross-connect-VCI = 210
Cross-connect-interface: ATM0/1/2
Cross-connect-VPI = 80
Cross-connect-VCI = 220
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Configuring Point-to-Multipoint PVP Connections

This section describes configuring point-to-multipoint PVP connections. Figure 5-5 provides an example of point-to-multipoint PVP connections.

Figure 5-5: Point-to-Multipoint Permanent Virtual Path Example

In Figure 5-5, cells entering the ATM switch router at the root point (the left side at interface 0/0/0), VPI = 50, are duplicated and switched to the leaf points (output interfaces), on the right side of the figure.

To configure point-to-multipoint PVP connections, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card-A/subcard-A/port-A

Select the interface to be configured.

2
atm pvp vpi-A [cast-type type] [rx-cttr index] [shaped] [tx-cttr index] interface card/subcard/port-B vpi-B [cast-type type]

Configure the interface PVP.

Step	Command	Task
1	interface atm card-A/subcard-A/port-A	Select the interface to be configured.
2	atm pvp vpi-A [cast-type type] [rx-cttr index] [shaped] [tx-cttr index] interface card/subcard/port-B vpi-B [cast-type type]	Configure the interface PVP.

To configure the point-to-multipoint PVP connections using the atm pvp command, the root point is port A and the leaf points are port B.

Examples

The following example shows how to configure the root-point PVP on ATM switch router interface 0/0/0, VPI = 50, to the leaf point interface 0/1/0, VPI = 60 (see Figure 5-5):

Switch(config)# interface atm 0/0/0
Switch(config-if)# atm pvp 50 cast-type p2mp-root interface atm 0/1/0 60 cast-type p2mp-leaf

Display Point-To-Multipoint PVP Configuration

To display the ATM interface configuration, use the following EXEC command:

Command Task

show atm vp [interface atm card/subcard/port vpi]

Show the ATM VP configuration.

Command	Task
show atm vp [interface atm card/subcard/port vpi]	Show the ATM VP configuration.

Examples

The following example shows the PVP configuration of the point-to-multipoint PVP connections on ATM interface 0/0/0:

Switch# show atm vp interface atm 0/0/0
Interface    VPI    Type  X-Interface     X-VPI     Status
ATM0/0/0     50      PVP     ATM0/1/0     60        UP
                             ATM0/1/1     70        UP
                             ATM0/1/2     80        UP

The following example shows the PVP configuration of the point-to-multipoint PVP connections on ATM interface 0/0/0 VPI = 50 with the switch processor feature card installed:

Switch# show atm vp interface atm 0/0/0 50
 
Interface: ATM0/0/0, Type: oc3suni
VPI = 50
Status: TUNNEL
Time-since-last-status-change: 00:00:37
Connection-type: PVP
Cast-type: point-to-multipoint-root
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM0/1/0, Type: oc3suni
Cross-connect-VPI = 60
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Cross-connect-interface: ATM0/1/1
Cross-connect-VPI = 70
Cross-connect-interface: ATM0/1/2
Cross-connect-VPI = 80
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Configuring Soft PVC Connections

This section describes configuring soft PVC connections, which provide the following features:

Connection to another host or ATM switch router that supports signalling

Configuration of PVCs without the manual configuration steps described in the section "Configuring Permanent Virtual Channel Connections"
Configuration of PVCs with the reroute or retry capabilities when a failure occurs in the network

Figure 5-6 illustrates the soft PVC connections used in the following examples.

Figure 5-6: Soft Permanent Virtual Channel Connection Example

Guidelines for Creating Soft PVCs

Perform the following steps when you configure soft PVCs:

Step 1 Determine which two ports you want to define as participants in the soft PVC.

Step 2 Decide which of these two ports you want to designate as the destination (or passive) side of the soft PVC.

This decision is arbitrary---it makes no difference which port you define as the destination end of the circuit.

Step 3 Configure the destination (passive) side of the soft PVC.

You must configure the destination end of the soft PVC first, to define an ATM address for that port.

You must retrieve this address (see Step 4), and the VPI/VCI values for the circuit (see Step 5), and use these elements as part of the command string when you configure the source (active) end of the soft PVC (see Step 6).

Note

Step 4 Retrieve the ATM address of the destination end of the soft PVC using the show atm address command.

Step 5 Retrieve the VPI/VCI values for the circuit using the show atm vc command.

Step 6 Configure the source (active) end of the soft PVC. At the same time, complete the soft PVC setup using the information derived from Step 4 and Step 5. Be sure to select an unused VPI/VCI value (one that does not appear in the show atm vc display).

You must configure the source end of the soft PVC last because this not only defines the configuration information for the source port, but also requires you to enter the ATM address and VPI/VCI values for the destination port.

If you have not already defined the destination port for the soft PVC (as required in Step 3), this ATM address is not defined for the destination port, and the VPI/VCI values are not available, as required in Step 6 for use in completing the soft PVC.

Soft Permanent Virtual Channel Configuration

To configure a soft PVC connection, perform the following steps, beginning in privileged EXEC mode:

Step Command Task

1
show atm addresses

Determine the destination ATM address.

2
configure terminal

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

3
interface atm card/subcard/port [.vpt #]

Select the interface to be configured.

4
atm soft-vc src-vpi src-vci dest-address address dest-vpi dest-vci [rx-cttr index] [tx-cttr index]

Configure the soft PVC connection.

Step	Command	Task
1	show atm addresses	Determine the destination ATM address.
2	configure terminal	At the privileged EXEC prompt, enter configuration mode from the terminal.
3	interface atm card/subcard/port [.vpt #]	Select the interface to be configured.
4	atm soft-vc src-vpi src-vci dest-address address dest-vpi dest-vci [rx-cttr index] [tx-cttr index]	Configure the soft PVC connection.

Examples

The following example shows User A determines the destination ATM address of the interface connected to User D:

Switch-C# show atm addresses

Switch Address(es):
  47.00918100000000603E5ADB01.00603E5ADB01.00 active
 
Soft VC Address(es):
47.0091.8100.1111.1111.1111.1111.1111.1111.1111.00 ATM3/0/0
 
ILMI Switch Prefix(es):
  47.0091.8100.0000.0060.3e5a.db01
 
ILMI Configured Interface Prefix(es):
 
LECS Address(es):

The following example shows how to configure a soft PVC on Switch B between interface 0/0/0, source VPI = 0, VCI = 200; and Switch C, destination VPI = 0, VCI = 100 with a specified ATM address (see Figure 5-6):

Switch-B(config)# interface atm 0/0/0
Switch-B(config-if)# atm soft-vc 0 200 dest-address 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00 0 100

Display Soft VC Configuration

To display the soft VC configuration at either end of a ATM switch router, use the following EXEC commands:

Command Task

show atm vc card/subcard/port

Show the ATM interface configuration.

show atm vc interface atm card/subcard/port vpi vci

Show the soft VC interface configuration.

Command	Task
show atm vc card/subcard/port	Show the ATM interface configuration.
show atm vc interface atm card/subcard/port vpi vci	Show the soft VC interface configuration.

Examples

The following example shows the soft VC configuration of Switch B, on interface 0/0/0 out to the ATM network:

Switch-B# show atm vc interface atm 0/0/0
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM0/0/0     0     5      PVC     ATM0 0     52    QSAAL  DOWN
ATM0/0/0     0     16     PVC     ATM0 0     32    ILMI   DOWN
ATM0/0/0 0 200SoftVC ATM3/0/0 0 100 UP

The following example shows the soft VC configuration of Switch C, on interface 3/0/0 out to the ATM network:

Switch-C# show atm vc interface atm 3/0/0
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM3/0/0     0     5      PVC     ATM0 0     52    QSAAL  DOWN
ATM3/0/0     0     16     PVC     ATM0 0     32    ILMI   DOWN
ATM3/0/0 0   100    SoftVC ATM0/0/0 0200 UP

The following example shows the soft VC configuration of Switch B, on interface 0/0/0, VPI = 0, VCI = 200 out to the ATM network with the switch processor feature card installed:

Switch-B# show atm vc interface atm 0/0/0 0 200
Interface: ATM0/0/0, Type: oc3suni
VPI = 0  VCI = 200
Status: NOT CONNECTED
Time-since-last-status-change: 00:00:45
Connection-type: SoftVC
Cast-type: point-to-point
Soft vc location: Source
Remote ATM address: 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00
Remote VPI: 0
Remote VCI: 100
Soft vc call state: Inactive
Number of soft vc re-try attempts: 4
Slow-retry-interval: 60 seconds
Next retry in: 29 seconds
Aggregate admin weight: 0
Packet-discard-option: disabled
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Configuring Soft PVP Connections

This section describes configuring soft PVP connections, which provide the following features:

Connection to another host or ATM switch router that supports signalling

Configuration of PVPs without the manual configuration steps described in the section "Configuring Permanent Virtual Channel Connections"
Configuration of PVPs with the reroute or retry capabilities when a failure occurs within the network

Figure 5-7 is an illustration of the soft PVP connections used in the examples in this section.

Figure 5-7: Soft Permanent Virtual Path Connection Example

To configure a soft PVP connection, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm soft-vp src-vpi dest-address dest-address dest-vpi [rx-cttr index] [tx-cttr index]

Configure the soft PVP connection.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm soft-vp src-vpi dest-address dest-address dest-vpi [rx-cttr index] [tx-cttr index]	Configure the soft PVP connection.

Example

The following example shows how to configure a soft PVP on Switch B between interface 0/0/0, source VPI = 75, and Switch C, destination VPI = 50, with a specified ATM address (Figure 5-7):

Switch-B(config)# interface atm 0/0/0
Switch-B(config-if)# atm soft-vp 75 dest-address 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00 50

Display Virtual Path Connection

To display the ATM virtual path configuration, use the following EXEC command:

Command Task

show atm vp [interface atm card/subcard/port vpi]

Show the ATM VP configuration.

Command	Task
show atm vp [interface atm card/subcard/port vpi]	Show the ATM VP configuration.

Examples

The following example shows the soft VP configuration at Switch B, on interface 0/0/0 out to the ATM network:

Switch-B# show atm vp
Interface    VPI    Type  X-Interface     X-VPI     Status
ATM0/0/0 75 SoftVPATM3/0/050 UP

The following example shows the soft VP configuration on interface 3/0/0 at Switch C out to the ATM network:

Switch-C# show atm vp
Interface    VPI    Type  X-Interface     X-VPI     Status
ATM3/0/0 50 SoftVPATM0/0/0 75 UP

The following example shows the soft VP configuration at Switch B on interface 0/0/0, VPI = 75, out to the ATM network with the switch processor feature card installed:

Switch-B# show atm vp interface atm 0/0/0 75
 
Interface: ATM0/0/0, Type: oc3suni
VPI = 75
Status: TUNNEL
Time-since-last-status-change: 00:01:10
Connection-type: SoftVP
Cast-type: point-to-point
Soft vp location: Source
Remote ATM address: 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00
Remote VPI: 50
Soft vp call state: Inactive
Number of soft vp re-try attempts: 4
Slow-retry-interval: 60 seconds
Next retry in: 4 seconds
Aggregate admin weight: 0
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx tolerance: 1024 (from default for interface)
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx tolerance: none

Configuring the Soft PVC Route Optimization Feature

This section describes the soft PVC route optimization feature. Most soft PVCs have a much longer lifetime than SVCs. The route chosen during PVC setup remains the same even though the network topology may change.

Soft PVC connections, with the route optimization percentage threshold set, provide the following features:

When a better route is available, soft PVCs are dynamically rerouted
Route optimization can be triggered manually

Note Soft PVC route optimization should not be configured with constant bit rate (CBR) connections.

Route optimization is directly related to administrative weight, which is similar to hop count. For a description of administrative weight, see the section "Configure the Global Administrative Weight Mode" in the chapter "Configuring ATM Routing and PNNI."

Configuring soft PVC route optimization is described in the following sections:

Enable Soft PVC Route Optimization

Soft PVC route optimization must be enabled and a threshold level configured to determine the point when a better route is identified and the old route is reconfigured.

To enable and configure soft PVC route optimization, use the following global configuration command:

Command Task

atm route-optimization {percentage-threshold percent}

Configure soft PVP route optimization.

Command	Task
atm route-optimization {percentage-threshold percent}	Configure soft PVP route optimization.

Example

The following example enables soft PVC route optimization and sets the threshold percentage to
250 percent:

Switch(config)# atm route-optimization percentage-threshold 250

Configure a Soft PVC Interface with Route Optimization

Soft PVC route optimization must be enabled and configured to determine the point at which a better route is found and the old route is reconfigured.

To enable and configure a soft PVC interface with route optimization, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm route-optimization soft-connection
[interval minutes] [time-of-day
{anytime | start-time | end-time}]

Configure the interface soft PVP route optimization.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm route-optimization soft-connection [interval minutes] [time-of-day {anytime \| start-time \| end-time}]	Configure the interface soft PVP route optimization.

Example

The following example shows how to configure a soft PVC with a route optimization interval configured as every 30 minutes between the hours of 6:00 P.M. and 5:00 A.M.:

Switch(config)# interface atm 0/0/0
Switch(config-if)# atm route-optimization soft-connection interval 30 time-of-day 18:00 5:00

Display Soft PVC Route Optimization Configuration

To display the soft PVC route optimization configuration, use the following EXEC command:

Command Task

show atm interface atm card/subcard/port

Show the soft VC interface configuration.

Command	Task
show atm interface atm card/subcard/port	Show the soft VC interface configuration.

Example

The following example shows the soft PVC configuration on interface 0/0/0:

Switch# show atm interface atm 0/0/0
 
IF Status:      UP              Admin Status:   up
Auto-config:    enabled         AutoCfgState:   completed
IF-Side:        Network         IF-type:        NNI
Uni-type:       not applicable  Uni-version:    not applicable
Max-VPI-bits:   8               Max-VCI-bits:   14
Max-VP:         255             Max-VC:         16383
ConfMaxSvpcVpi: 255             CurrMaxSvpcVpi: 255
ConfMaxSvccVpi: 255             CurrMaxSvccVpi: 255
ConfMinSvccVci: 35              CurrMinSvccVci: 35
Svc Upc Intent: pass            Signalling:     Enabled


 
  Soft vc route optimization is enabled


 
  Soft vc route optimization interval = 30 minutes


 
  Soft vc route optimization time-of-day range = (18:0 - 5:0)
ATM Address for Soft VC: 47.0091.8100.0000.00e0.4fac.b401.4000.0c80.8000.00
Configured virtual links:
  PVCLs SoftVCLs   SVCLs   TVCLs   PVPLs SoftVPLs   SVPLs Total-Cfgd Inst-Conns
      4        0       0       0       0        0       0          4          2
Logical ports(VP-tunnels):     0
Input cells:    264581          Output cells:   273590
5 minute input rate:             0 bits/sec,       0 cells/sec
5 minute output rate:            0 bits/sec,       0 cells/sec
Input AAL5 pkts: 172733, Output AAL5 pkts: 177305, AAL5 crc errors: 0

Configuring Nondefault Well-Known PVCs

Normally the default well-known VCs are automatically created with default VCIs. However, for the unusual instances where the ATM switch router interfaces with nonstandard equipment, you can configure nondefault well-known VCI values on a per-interface basis.

Table 5-2 lists the default well-known VCs and their default configuration.

Channel Type	Virtual Path Identifier	Virtual Channel Identifier
Signalling	0	5
ILMI	0	16
PNNI	0	18
Tag switching	0	32

Table 5-2: Well-Known Virtual Channels

Channel Type Virtual Path Identifier Virtual Channel Identifier

Signalling

0

5

ILMI

0

16

PNNI

0

18

Tag switching

0

32

Caution
Do not change the well-known channels to use a VC where the remote end is sending AAL5 messages not intended for the well-known VC. For example, do not swap VC values between two types of well-known VCs.

Overview of Nondefault PVC Configuration

Following is an overview of the steps needed to configure nondefault well-known VCs:

Step 1 Enable manual well-known VC configuration.

Step 2 Delete any existing automatically created well-known VCs.

Step 3 Configure the individual encapsulation type as follows:

Signalling (QSAAL)
ILMI
PNNI
Tag switching

Step 4 Copy the running-configuration file to the startup-configuration file.

Configure Nondefault PVCs

To configure the nondefault VCs for signalling, ILMI, and PNNI, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm manual-well-known-vc {keep | delete}

Enter manual-well-known-vc mode.

3
atm pvc vpi vci [rx-cttr index] [tx-cttr index] interface atm card/subcard/port any-vci [encap {ilmi | pnni | qsaal}]

or

tag-switching atm control-vc vpi vci

Configure the nondefault PVC for encapsulation type.

4
exit

Exit from interface configuration mode.

5
end

Exit from global configuration mode.

6
copy system:running-config nvram:startup-config

Copy the running configuration file to the startup configuration file.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm manual-well-known-vc {keep \| delete}	Enter manual-well-known-vc mode.
3	atm pvc vpi vci [rx-cttr index] [tx-cttr index] interface atm card/subcard/port any-vci [encap {ilmi \| pnni \| qsaal}] or tag-switching atm control-vc vpi vci	Configure the nondefault PVC for encapsulation type.
4	exit	Exit from interface configuration mode.
5	end	Exit from global configuration mode.
6	copy system:running-config nvram:startup-config	Copy the running configuration file to the startup configuration file.

Note An error condition occurs if either the signalling or ILMI well-known VCs remain unconfigured when an interface is enabled.

Example

The following example shows the nondefault VC configuration steps:

Step 1 Use the show atm vc interface atm command to display the configuration of the existing default well-known VCs for ATM interface 0/0/0.

Step 2 Change to interface configuration mode for ATM interface 0/0/0.

Step 3 Enter manual well-known-vc mode and delete the existing default well-known VCs using the atm manual-well-known-vc delete command.

Step 4 Confirm deletion by entering y.

Step 5 Configure the nondefault VC for signalling from 5 (the default) to 35 using the atm pvc command.

Step 6 Configure the ILMI VC, then configure the PNNI VC if needed using the same procedure.

Step 7 Save the new running configuration to the startup configuration.

An example of this procedure follows:

Switch# show atm vc interface atm 0/0/0
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM0/0/0 0     5      PVC     ATM0 0     49    QSAAL  UP
ATM0/0/00     16     PVC     ATM0 0     33    ILMI   UP
ATM0/0/00     18     PVC     ATM0 0     65    PNNI   UP
Switch#
Switch# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface atm 0/0/0
Switch(config-if)# atm manual-well-known-vc delete
 
Okay to delete well-known VCs for this interface? [no]: y
Switch(config-if)# exit
Switch(config)# interface atm 0/0/0
Switch(config-if)# atm pvc 1 35 interface atm0 any-vci encap qsaal
Switch(config-if)# end
Switch#
%SYS-5-CONFIG_I: Configured from console by console
Switch# show atm vc interface atm 0/0/0
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status
ATM0/0/0     1 35     PVC     ATM0 0     150   QSAAL  UP
Switch# copy system:running-config nvram:startup-config
Building configuration...
[OK]

Configuring Interface and Connection Snooping

Snooping allows the cells from all connections, in either receive or transmit direction, on a selected physical port to be transparently mirrored to a snoop test port where an external ATM analyzer can be attached. Unlike shared medium LANs, an ATM system requires a separate port to allow nonintrusive traffic monitoring on a line.

Note Only cells that belong to existing connections are sent to the snoop test port. Any received cells that do not belong to existing connections are not copied. In addition, the STS-3c (or other) overhead bytes transmitted at the test port are not copies of the overhead bytes at the monitored port.

Snooping Overview

The following sections provide background information on how snooping functions on the ATM switch router.

Snooping the Receive Direction

Figure 5-8 shows snooping the receive direction of a port. Snoop test port X receives copies of cells that enter the ATM switch router at port A and belong to existing connections, regardless of the connection destinations that the cells mirrored before the cell output queues. Discarded cells do not reach the test port. All cells transmitted at test port X retain the cell headers present at the original receive port A.

Figure 5-8: Snooping in the Receive Direction

Snooping the Transmit Direction

Figure 5-9 shows snooping the transmit direction of a port. Snoop test port X transparently receives copies of all cells that belong to connections destined for port A, regardless of the source port. The test port cells are duplicated during the output stage of the switching process after the cell output queues. Cell discards, cell buffering, and cell priority scheduling affect both copies of the cells in the same way. The cell headers transmitted from test port X match the cell headers transmitted from the monitored port A.

Figure 5-9: Snooping in the Transmit Direction

Snoop Test Ports

With the switch processor feature card installed, interface snooping is implemented in software. There is no restriction on the snoop test port; the snoop test port can be any port in the system, excluding CES modules. Also, multiple interfaces can be snooped simultaneously. You can configure snooping on both transmit and receive directions on two different ports and monitor traffic in both directions simultaneously. The switch processor feature card also supports per-connection snooping.

Effect of Snooping on Monitored Port

There is no effect on cell transmission, interface or VC status and statistics, front panel indicators, or any other parameters associated with a port being monitored during snooping. Any port, other than the highest port, that contains a port adapter type with a bandwidth less than or equal to the port adapter bandwidth for the test port can be monitored by snooping.

Test Port Shutdown for Snoop Mode Configuration

The port being configured as a test port must be shut down before configuration. While the test port is shut down and after snoop mode has been configured, no cells are transmitted from the test port until it is reenabled using the no shutdown command. A test port can be put into snoop mode even if there are existing connections to it; however, those connections remain "Down" even after the test port is reenabled using the no shutdown command. This includes any terminating connections for ILMI, PNNI, or signalling channels on the test port.

If you use a show atm interface command while the test port is enabled in snoop mode, the screen shows the following:

Interface state appears as "Snooping" instead of "up" or "down."
Other ATM layer information for the test port is still displayed.
Any previously configured connections on the test port remain installed, but are listed as Connection Status = down.
Data for transmitted cells and output rates indicates the snooping cells are being transmitted.
Counts for receive cells should remain unchanged and the input rate should be 0.

Other Configuration Options for Snoop Test Port

Most inapplicable configurations on the test port interface are disregarded while in snoop mode. However, the following configuration options are not valid when specified for the snoop test port and may affect the proper operation of the snoop mode on the test port:

Diagnostic and PIF loopbacks of the snoop test port. These types of loopbacks do not function in snooping mode since the PIF receive side signals are disabled.
Other physical layer loopbacks (line, cell, or payload) function normally when in snooping mode since they loop toward the line and are unaffected by the lack of PIF receive input.
Interface pacing (with the rate for the snoop test port lower than the rate for the monitored port).
Network-derived clock source using the snoop test port.
Clock-source = loop-timed for the snoop test port.

Caution
You should ensure that all options are valid and configured correctly while in the snoop mode.

Configure Interface Snooping

The atm snoop interface atm command enables a snoop test port. Cells transmitted from the snoop test port are copies of cells from a single direction of a monitored port.

When in snoop mode, any prior permanent virtual connections to the snoop test port remain in the down state.

To configure interface port snooping, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm snoop interface atm card/subcard/port direction [receive | transmit]

Specify the interface and direction to be snooped.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm snoop interface atm card/subcard/port direction [receive \| transmit]	Specify the interface and direction to be snooped.

Example

The following example shows how to configure ATM interface 12/1/3 as the port in snoop mode to monitor ATM interface 3/0/0, tested in the receive direction:

Switch(config)# interface atm  12/1/3
Switch(config-if)# atm snoop interface atm 3/0/0 direction receive

Display Interface Snooping

To display the test port information, use the following EXEC command:

Command Task

show atm snoop

Display the snoop configuration.

Command	Task
show atm snoop	Display the snoop configuration.

Example

The following example shows the snoop configuration on the OC3 port and the actual register values for the highest interface:

Switch# show atm snoop
Snoop Test Port Name:  ATM12/1/3 (interface status=SNOOPING)
Snoop option:          (configured=enabled) (actual=enabled)
Monitored Port Name:   (configured=ATM3/0/0) (actual=ATM3/0/0)
Snoop direction:       (configured=receive) (actual=receive)

Configure Per-Connection Snooping

With per-connection snooping you must specify both the snooped connection endpoint and the snooping connection endpoint. The IOS adds the snooping connection endpoint as a leaf to the snooped connection. The root of the temporary multicast connection depends on the direction being snooped. Snooping in the direction of leaf to root is not allowed for multicast connections. Per-connection snooping features are as follows:

Per-VC snooping
Per-VP snooping

The snooping connection can be configured on any port when there is no VPI/VCI collision for the snoop connection with the existing connections on the port. Also the port should have enough resources to satisfy the snoop connection resource requirements. In case of failure, due to VPI/VCI collision or resource exhaustion, a warning message is displayed, and you can reconfigure the connection on a different port.

To snoop both transmit and receive directions of a connection, you need to configure two different snoop connections.

Note Per-connection snooping is available only with the switch processor feature card.

Nondisruptive per-connection snooping is achieved by dynamically adding a leaf to an existing connection (either unicast or multicast). This can lead to cell discard if the added leaf cannot process the snooped cells fast enough. For a multicast connection, the queue buildup is dictated by the slowest leaf in the connection. The leaf added for snooping inherits the same traffic characteristics as the other connection leg. This ensures that the added leaf does not become the bottleneck and affect the existing connection.

To configure connection snooping, perform the following steps, beginning in global configuration mode:

Step Command Task

1
interface atm card/subcard/port

Select the interface to be configured.

2
atm snoop-vc [a-vpi a-vci] interface atm card/subcard/port x-vpi x-vci [direction {receive | transmit}]

Configure the virtual channel to be snooped. a denotes the snooping connection. x denotes the snooped connection.

3
atm snoop-vp [a-vpi] interface atm card/subcard/port x-vpi [direction {receive | transmit}]

Configure the virtual path to be snooped.

Step	Command	Task
1	interface atm card/subcard/port	Select the interface to be configured.
2	atm snoop-vc [a-vpi a-vci] interface atm card/subcard/port x-vpi x-vci [direction {receive \| transmit}]	Configure the virtual channel to be snooped. a denotes the snooping connection. x denotes the snooped connection.
3	atm snoop-vp [a-vpi] interface atm card/subcard/port x-vpi [direction {receive \| transmit}]	Configure the virtual path to be snooped.

Examples

The following example shows how to configure VC 100 200 on ATM interface 3/1/0 to snoop a VC 200 150, on ATM interface 1/0/0:

Switch(config)# interface atm 3/1/0
Switch(config-if)# atm snoop-vc 100 200 interface atm 1/0/0 200 150 direction receive

The following example shows how to configure VP 100 on ATM interface 3/1/0 to snoop a VP 200, on ATM interface 1/0/0:

Switch(config)# interface atm 3/1/0
Switch(config-if)# atm snoop-vp 100 interface atm 1/0/0 200 direction receive

Display Per-connection Snooping

To display the test per-connection information, use the following EXEC commands:

Command Task

show atm snoop-vc
[interface atm card/subcard/port [vpi vci]]

Display the snoop VC information.

show atm snoop-vp
[interface atm card/subcard/port [vpi]]

Display the snoop VP information.

Command	Task
show atm snoop-vc [interface atm card/subcard/port [vpi vci]]	Display the snoop VC information.
show atm snoop-vp [interface atm card/subcard/port [vpi]]	Display the snoop VP information.

Examples

The following example shows all VC snoop connections on the ATM switch router:

Switch> show atm snoop-vc
      Snooping                            Snooped                   
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI Dir    Status
ATM0/0/2     0     5     PVC     ATM0/1/1     0     5     Rx     DOWN    
ATM0/0/2     0     16    PVC     ATM0/1/1     0     16    Rx     DOWN    
ATM0/1/2     0     5     PVC     ATM0/0/1     0     5     Tx     DOWN    
ATM0/1/2     0     16    PVC     ATM0/0/1     0     16    Tx     DOWN    
ATM0/1/2     0     18    PVC     ATM0/0/1     0     18    Tx     UP      
ATM0/1/2     0     100   PVC     ATM0/0/1     0     100   Tx     DOWN    
ATM0/1/2     0     201   PVC     ATM0/0/1     0     201   Tx     DOWN    
ATM0/1/2     0     202   PVC     ATM0/0/1     0     202   Tx     DOWN    
ATM0/1/2     0     300   PVC     ATM0/0/1     0     300   Tx     DOWN    
ATM0/1/2     0     301   PVC     ATM0/0/1     0     301   Tx     DOWN

The following example shows the VC snoop connections on ATM interface 0/1/2:

Switch> show atm snoop-vc interface atm 0/1/2
      Snooping                            Snooped                   
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI Dir    Status
ATM0/1/2     0     5     PVC     ATM0/0/1     0     5     Tx     DOWN    
ATM0/1/2     0     16    PVC     ATM0/0/1     0     16    Tx     DOWN    
ATM0/1/2     0     18    PVC     ATM0/0/1     0     18    Tx     UP      
ATM0/1/2     0     100   PVC     ATM0/0/1     0     100   Tx     DOWN    
ATM0/1/2     0     201   PVC     ATM0/0/1     0     201   Tx     DOWN    
ATM0/1/2     0     202   PVC     ATM0/0/1     0     202   Tx     DOWN    
ATM0/1/2     0     300   PVC     ATM0/0/1     0     300   Tx     DOWN    
ATM0/1/2     0     301   PVC     ATM0/0/1     0     301   Tx     DOWN

The following example shows the VC snoop connection 0, 55 on ATM interface 0/0/2 in extended mode with the switch processor feature card installed:

Switch> show atm snoop-vc interface atm 0/0/2 0 55
Interface: ATM0/0/2, Type: oc3suni 
VPI = 0  VCI = 55
Status: DOWN
Time-since-last-status-change: 00:01:59
Connection-type: PVC 
Cast-type: snooping-leaf
Packet-discard-option: disabled
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM0/1/1, Type: oc3suni 
Cross-connect-VPI = 0 
Cross-connect-VCI = 5
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Threshold Group: 6, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 3
Rx service-category: VBR-RT (Realtime Variable Bit Rate)
Rx pcr-clp01: 424
Rx scr-clp01: 424
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 3
Tx service-category: VBR-RT (Realtime Variable Bit Rate)
Tx pcr-clp01: 424
Tx scr-clp01: 424
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

The following example shows all VP snoop connections on the ATM switch router:

Switch> show atm snoop-vp
      Snooping                    Snooped               
Interface    VPI   Type    X-Interface  X-VPI Dir    Status
ATM0/1/2     57    PVP     ATM0/0/1     57    Tx     DOWN

The following example shows all VP snoop connections on ATM interface 0/1/2, VPI = 57, in extended mode with the switch processor feature card installed:

Switch> show atm snoop-vp interface atm 0/1/2 57
Interface: ATM0/1/2, Type: oc3suni 
VPI = 57  
Status: DOWN
Time-since-last-status-change: 00:14:46
Connection-type: PVP 
Cast-type: snooping-leaf
Usage-Parameter-Control (UPC): pass
Wrr weight: 32
Number of OAM-configured connections: 0
OAM-configuration: disabled
OAM-states:  Not-applicable
Cross-connect-interface: ATM0/0/2, Type: oc3suni 
Cross-connect-VPI = 57 
Cross-connect-UPC: pass
Cross-connect OAM-configuration: disabled
Cross-connect OAM-state:  Not-applicable
Threshold Group: 5, Cells queued: 0
Rx cells: 0, Tx cells: 0
Tx Clp0:0,  Tx Clp1: 0
Rx Clp0:0,  Rx Clp1: 0
Rx Upc Violations:0, Rx cell drops:0
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0
Rx connection-traffic-table-index: 1
Rx service-category: UBR (Unspecified Bit Rate)
Rx pcr-clp01: 7113539
Rx scr-clp01: none
Rx mcr-clp01: none
Rx      cdvt: 1024 (from default for interface)
Rx       mbs: none
Tx connection-traffic-table-index: 1
Tx service-category: UBR (Unspecified Bit Rate)
Tx pcr-clp01: 7113539
Tx scr-clp01: none
Tx mcr-clp01: none
Tx      cdvt: none
Tx       mbs: none

Table of Contents

Configuring Virtual Connections

Examples

Examples

Examples

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Example

Examples

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Example

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Examples

Examples