Syntax Description

number

Maximum number of packet fragmentations that the AIP can perform simultaneously, from 0 to 512.

Defaults

256

Command Modes

Interface configuration

Command History

Release	Modification
10.0	This command was introduced.

Usage Guidelines

This command is supported on the ATM Interface Processor (AIP) for Cisco 7500 series routers. This command is not supported on the ATM port adapter for Cisco 7200 and 7500 series routers, nor is it supported on Cisco 4500 and Cisco 4700 routers.

atm txbuff 300

Syntax Description

version-number

UNI version selected on an interface. Valid values are 3.0 and 3.1.

Defaults

Version 3.0

Command Modes

Interface configuration

Command History

Release	Modification
11.2	This command was introduced.

Usage Guidelines

Normally, when the ILMI link autodetermination is enabled on the interface and is successful, the router accepts the UNI version returned by ILMI. If the ILMI link autodetermination is unsuccessful or ILMI is disabled, the UNI version defaults to 3.0. You can override the default UNI version by using this command to enable UNI 3.1 signalling support. The no form of the command sets the UNI version to one returned by ILMI if ILMI is enabled and the link autodetermination process is successful. Otherwise, the UNI version reverts to 3.0.

interface atm 2/0
 atm uni-version 3.1

atm vc-per-vp 512

Related Commands

Command	Description
pvc	Configures the PVC interface.

Syntax Description

hexvalue

Value in hexadecimal format.

Defaults

0x7B

Command Modes

Interface configuration

Command History

Release	Modification
10.0	This command was introduced.

Usage Guidelines

This command is supported on Cisco 7500 series routers, but not on Cisco 4500 and Cisco 4700 routers. This command is not supported on ATM port adapters.

This command allows you to specify a virtual path identifier (VPI) or range of VPIs to be used for ATM adaptation layer 3/4 (AAL3/4) processing. All other VPIs map to AAL5 processing. If only AAL5 processing is required, you can either let the virtual path filter default or set it to an arbitrary VPI so that AAL5 processing is performed on all VPIs.

This command configures the hexadecimal value used in the virtual path filter register in the reassembly operation. The virtual path filter comprises 16 bits. The virtual path filter register uses the most significant bits (bits 15 through 8, the left half of the filter) as mask bits, and uses bits 7 through 0 (the right half of the filter) as compare bits.

When a cell is received, the right half of the filter is exclusively NORed with the binary value of the incoming VPI. The result is then ORed with the left half of the filter (the mask). If the result is all 1s, then reassembly is done using the VCI/message identifier (MID) table (AAL3/4 processing). Otherwise, reassembly is done using the VPI-VCI pair table (AAL5 processing).

atm vp-filter ff00
 

In the following example, all incoming cells with the virtual path equal to 0 are reassembled using AAL3/4 processing; all other cells are reassembled using AAL5 processing:

atm vp-filter 0
 

In the following example, all incoming cells with the most significant bit of the virtual path set are reassembled using AAL3/4 processing; all other cells are reassembled using AAL5 processing:

atm vp-filter 7f80

Syntax Description

This command has no arguments or keywords.

Defaults

Disabled. For classical IP SVCs, broadcast is enabled.

Command Modes

Interface-ATM-VC configuration (for ATM PVCs and SVCs

VC-class configuration (for a VC-class)

Bundle configuration (for a VC bundle)

Command History

Release	Modification
11.3 T	This command was introduced.
12.0(3)T	Enhancements were added for configuration of broadcast packet duplication and transmission for an ATM VC bundle.

Usage Guidelines

If broadcasting and multipoint signalling are enabled on an SVC, a multipoint SVC will be created to handle the SVC.

Note If you use the broadcast command to configure broadcasting for an ATM PVC or SVC, VC-class, or VC bundle, this configuration takes precedence over any previous configuration using the broadcast command.

If the broadcast command is not explicitly configured on an ATM PVC, SVC, or VC bundle, the VC inherits the following default configuration (listed in order of next highest precedence):

• Configuration of the broadcast command in a VC class assigned to the PVC, SVC, or VC bundle itself.

• Configuration of the broadcast command in a VC class assigned to the PVC's, SVC's, or VC bundle's ATM subinterface.

• Configuration of the broadcast command in a VC class assigned to the PVC's, SVC's, or VC bundle's ATM main interface.

Note When a VC is a member of a VC bundle, configuration using the broadcast command in VC-class configuration mode no longer applies to the VC. Bundle configuration takes precedence.

To use the broadcast command in bundle configuration mode, enter the bundle command to enact bundle configuration mode for the bundle for which you want to enable broadcast forwarding.

Examples

The following example enables the transmission of broadcast packets on an ATM PVC named router5:

pvc router5 1/32
 broadcast
 

The following example enables the transmission of broadcast packets on an ATM PVC bundle named chicago:

		bundle chicago 
 broadcast

Related Commands

Command	Description
class-int	Assigns a VC class to an ATM main interface or subinterface.
class-vc	Assigns a VC class to an ATM PVC, SVC, or VC bundle member.
encapsulation	Sets the encapsulation method used by the interface.
inarp	Configures the Inverse ARP time period for an ATM PVC, VC class, or VC bundle.
oam-bundle	Enables end-to-end F5 OAM loopback cell generation and OAM management for a virtual circuit class that can be applied to a virtual circuit bundle.
oam retry	Configures parameters related to OAM management for an ATM PVC, SVC, VC class, or VC bundle.
protocol	Configures a static map for an ATM PVC, SVC, VC class, or VC bundle. Enables Inverse ARP or Inverse ARP broadcasts on an ATM PVC by either configuring Inverse ARP directly on the PVC, on the VC bundle, or in a VC class (applies to IP and IPX protocols only).
ubr	Configures UBR QoS and specifies the output peak cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
ubr+	Configures UBR QoS and specifies the output peak cell rate and output minimum guaranteed cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
vbr-nrt	Configures the VBR-NRT QoS and specifies output peak cell rate, output sustainable cell rate, and output maximum burst cell size for an ATM PVC, SVC, VC class, or VC bundle member.

Use the srts keyword when a network-derived clock is available but devices attached to the CES port use a different clock reference. The srts keyword samples the incoming clock, subtracts from the network clock, and sends the remainder in an AAL1 header. The clock is reconstructed during output by adding the residual to the network reference.

Use the synchronous keyword for all other modes.

Examples

The following command sets the AAL1 timing recovery clock to adaptive mode:

interface cbr 4/0
 ces aal1 clock adaptive

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
ces dsx1 clock source	Configures a transmit clock source for the CBR interface.
network-clock-select (ATM)	Establishes the sources and priorities of the requisite clocking signals for an ATM-CES port adapter.

Syntax Description

circuit-number	Selects the circuit identification. For unstructured service, use 0. For T1 structured service, the range is 1 through 24. For E1 structure service, the range is 1 through 31.
cas	(Optional) Enables channel-associated signalling for structured service only. The default is no cas.
cdv range	(Optional) Enables the peak-to-peak cell delay variation requirement. The range for CDV is 1 through 65535 milliseconds. The default is 2000 milliseconds.
circuit-name name	(Optional) Sets the ASCII name for the CES-IWF circuit. The string for the circuit name is 0 through 255. The default is CBRx/x:0.
on-hook-detection hex-number	(Optional) Enables detection of whether the circuit is on-hook. Hex values are 0 through F to indicate a 2- or 4-bit AB[CD] pattern to detect on-hook. The AB[CD] bits are determined by the manufacturer of the voice/video telephony device that is generating the CBR traffic.
partial-fill range	(Optional) Enables the partial AAL1 cell fill service for structured service only. The range is 0 through 47. The default is 47.
shutdown	(Optional) Marks the CES-IWF circuit administratively down. The default is no shutdown.
timeslots range	(Optional) Configures the time slots for the CES-IWF circuit for structured service only. The range is 1 through 24 for T1. The range is 1 through 31 for E1.

Defaults

No circuit is configured.

Command Modes

Interface configuration

Command History

Release	Modification
11.1	This command was introduced.

Usage Guidelines

With both the CAS and on-hook detection features enabled, these features work together to enable an ingress node in an ATM network to monitor on-hook and off-hook conditions for a specified 1 x 64 structured CES circuit. As implied by the notation "1 x 64," the on-hook detection (or bandwidth-release) feature is supported only in a structured CES circuit that involves a single time slot at each end of the connection.

The time slot configured for the structured CES circuit at the ingress node (time slot 2) can be different from the DS0 time slot configured at the egress node (time slot 4). Only one such time slot can be configured at each end of the circuit when the on-hook detection feature is used.

When you invoke the on-hook feature, the ingress ATM-CES port adapter monitors the ABCD bits in the incoming CBR bit stream to detect on-hook and off-hook conditions in the circuit. In an "off-hook" condition, all the bandwidth provisioned for the specified CES circuit is used for transporting ATM AAL1 cells across the network from the ingress node to the egress node.

In an on-hook condition, the network periodically sends dummy ATM cells from the ingress node to the egress node to maintain the connection. However, these dummy cells consume only a fraction of the circuit's reserved bandwidth, leaving the rest of the bandwidth available for use by other network traffic. This bandwidth-release feature enables the network to make more efficient use of its resources.

When the CAS feature is enabled for a CES circuit, the bandwidth of the DS0 channel is limited to 56 kbps for user data, because CAS functions consume 8 kbps of channel bandwidth for transporting the ABCD signalling bits. These signalling bits are passed transparently from the ingress node to the egress node as part of the ATM AAL1 cell stream.

In summary, when the optional CAS and on-hook detection features are enabled, the following conditions apply:

• The permanent virtual connection (PVC) provisioned for the CES circuit always exists.

• The bandwidth for the CES circuit is always reserved.

• During an on-hook state, most of the bandwidth reserved for the CES circuit is not in use. (Dummy cells are sent from the ingress node to the egress node to maintain the connection.) Therefore, this bandwidth becomes available for use by other network traffic, such as available bit rate (ABR) traffic.

• During an off-hook state, all the bandwidth reserved for the CES circuit is dedicated to that circuit.

Examples

The following example sets the structured service CDV range to 5000 milliseconds and enables the interface:

interface cbr 4/0
 ces circuit 3 cdv 5000
 ces circuit 3 no shutdown

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Syntax Description

loop-timed	Configures the transmit clock to loop (RX-clock to TX-clock).
network-derived	Configures the transmit clock to be derived from the network.

Defaults

network-derived

Command Modes

Interface configuration

Command History

Release	Modification
11.1	This command was introduced.

Examples

The following example sets the clock source to loop-timed:

interface cbr 4/0
 ces dsx1 clock source loop-timed

Related Commands

Command	Description
ces aal1 clock	Configures the AAL1 timing recovery clock for the CBR interface.
ces aal1 service	Configures the type of CES used on the CBR interface.
network-clock-select (ATM)	Establishes the sources and priorities of the requisite clocking signals for an ATM-CES port adapter.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Examples

The following example sets the data line type to super frame:

interface cbr 4/0
 ces dsx1 framing sf

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Syntax Description

length

Sets the cable length. Values are (in feet): 0_110, 110_200, 220_330, 330_440, 440_550, 550_660, 660_above, and square_pulse.

Defaults

0_110 feet

Command Modes

Interface configuration

Command History

Release	Modification
11.1	This command was introduced.

Usage Guidelines

Examples

The following example sets the cable length to 440 feet:

interface cbr 4/0
 ces dsx1 lbo 440_550

Related Commands

Command	Description
atm lbo	Specifies the cable length (line build-out) for the ATM interface.
ces aal1 service	Configures the type of CES used on the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Examples

The following example specifies B8ZS as the line code type:

interface cbr 4/0
 ces dsx1 linecode b8zs

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Examples

The following example sets a payload loopback:

interface cbr 4/0
 ces dsx1 loopback payload

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
loopback	Configures the ATM interface into loopback mode.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Examples

The following example enables channel-associated signalling and robbed bit signalling:

interface cbr 4/0
 ces circuit 1 cas
 ces dsx1 signalmode robbedbit

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
ces circuit	Configures the connection attributes for the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

You must configure both sides of the CES circuits because at the source (the active side in CES-IWF), the time slots are not recognized at the destination (the passive side).

Each CES circuit has an ATM address. When configuring the source PVC, you need the destination ATM address.

Examples

The following example shows setting a hard PVC. In this example, the destination of ATM port 0 in slot 1 is assigned to circuit 31 on CBR port 0 in slot 4.

interface cbr 4/0
 ces pvc 31 interface atm 1/0 vpi 0 vci 512

Related Commands

Command	Description
ces aal1 service	Configures the type of CES used on the CBR interface.
show ces circuit	Displays detailed circuit information for the CBR interface.
show ces interface cbr	Displays detailed CBR port information.
show ces status	Displays the status of the ports on the ATM-CES port adapter.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Syntax Description

vc-class-name

Name of the VC class you are assigning to your ATM main interface or subinterface.

Defaults

No VC class is assigned to an ATM main interface or subinterface.

Command Modes

Interface configuration

Command History

Release	Modification
11.3(4)T	This command was introduced, replacing the class command for assigning VC classes to ATM main interfaces or subinterfaces.

Usage Guidelines

Use this command to assign a previously defined set of parameters (defined in a VC class) to an ATM main interface or subinterface. To create a VC class that defines these parameters, use the vc-class atm command. Refer to the section "Configuring VC Classes" in the "Configuring ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide for more information.

To use this command for assigning a VC class to an ATM main interface or subinterface, you must first enter the interface atm command to enter interface configuration mode.

When you create a VC class for an ATM main interface or subinterface, you can use the following commands to define your parameters: abr, broadcast, bump, encapsulation, idle-timeout, ilmi manage, inarp, oam-bundle, oam-pvc, oam retry, oam-svc, protocol, ubr, ubr+, and vbr-nrt.

Parameters applied to an individual VC supersede interface- and subinterface-level parameters. Parameters that are configured for a VC through discrete commands entered in interface-ATM-VC configuration mode supersede VC class parameters assigned to an ATM main interface or subinterface by the class-int command.

Examples

In the following example, a class called classA is first created and then applied to an ATM main interface 2/0:

! The following commands create the class classA:
vc-class atm classA
 ubr 10000
 encapsulation aal5mux ip
 
! The following commands apply classA to ATM main interface 2/0:
interface atm 2/0
 class-vc classA

Related Commands

Command	Description
abr	Selects ABR QoS and configures output peak cell rate and output minimum guaranteed cell rate for an ATM PVC or VC class.
broadcast	Configures broadcast packet duplication and transmission for an ATM VC class, PVC, SVC, or VC bundle.
encapsulation aal5	Configures the AAL and encapsulation type for an ATM PVC, SVC, or VC class.
idle-timeout	Configures the idle timeout parameter for tearing down an ATM SVC connection.
ilmi manage	Enables ILMI management on an ATM PVC.
inarp	Configures the Inverse ARP time period for an ATM PVC, VC class, or VC bundle.
oam-pvc	Enables end-to-end F5 OAM loopback cell generation and OAM management for an ATM PVC or VC class.
oam retry	Configures parameters related to OAM management for an ATM PVC, SVC, VC class, or VC bundle.
oam-svc	Enables end-to-end F5 OAM loopback cell generation and OAM management for an ATM SVC or VC class.
protocol (ATM)	Configures a static map for an ATM PVC, SVC, VC class, or VC bundle. Enables Inverse ARP or Inverse ARP broadcasts on an ATM PVC by either configuring Inverse ARP directly on the PVC, on the VC bundle, or in a VC class (applies to IP and IPX protocols only).
show atm map	Displays the list of all configured ATM static maps to remote hosts on an ATM network.
ubr	Configures UBR QoS and specifies the output peak cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
ubr+	Configures UBR QoS and specifies the output peak cell rate and output minimum guaranteed cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
vbr-nrt	Configures the VBR-NRT QoS and specifies output peak cell rate, output sustainable cell rate, and output maximum burst cell size for an ATM PVC, SVC, VC class, or VC bundle member.
vc-class atm	Configures a VC class for an ATM VC or interface.

Syntax Description

vc-class-name

Name of the VC class you are assigning to your ATM PVC, SVC, or VC bundle member.

Defaults

No VC class is assigned to an ATM PVC, SVC, or VC bundle member.

Command Modes

Interface-ATM-VC configuration (for ATM PVCs and SVCs)

Bundle-vc configuration (for VC bundle members)

Command History

Release	Modification
11.3(4)T	This command was introduced, replacing the class command for assigning VC classes to ATM PVCs and SVCs.
12.0(3)T	This command was modified to support application of a VC class to an ATM VC bundle and an ATM VC bundle member.

Usage Guidelines

Use this command to assign a previously defined set of parameters (defined in a VC class) to an ATM PVC, SVC, or VC bundle member. To create a VC class that defines these parameters, use the vc-class atm command. Refer to the section "Configuring VC Classes" in the "Configuring ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide for more information.

ATM PVCs and SVCs

To use this command for assigning a VC class to an ATM PVC or SVC, you must first enter the interface atm command in global configuration mode and then the pvc or svc command in interface configuration mode.

When you create a VC class for an ATM PVC or SVC, you can use the following commands to define your parameters: abr, broadcast, bump, encapsulation, idle-timeout, ilmi manage, inarp, oam-bundle, oam-pvc, oam retry, oam-svc, protocol, ubr, ubr+, and vbr-nrt.

Parameters that are configured for a PVC or SVC through discrete commands entered in interface-ATM-VC configuration mode supersede VC class parameters assigned to an ATM PVC or SVC by the class-vc command.

ATM VC Bundle Members

To use this command for assigning a VC class to a VC bundle member, you must first enter the pvc-bundle command to enter bundle-vc configuration mode.

When you create a VC class for a VC bundle member, you can use the following commands to define your parameters: bump, precedence, protect, ubr, ubr+, and vbr-nrt. You cannot use the following commands in vc-class configuration mode to configure a VC bundle member: encapsulation, protocol, inarp, and broadcast. These commands are useful only at the bundle level, not the bundle member level.

Parameters applied to an individual VC supersede bundle-level parameters. Parameters that are directly configured for a VC through discrete commands entered in bundle-vc configuration mode supersede VC class parameters assigned to a VC bundle member by the class-vc command.

Examples

The following sections show examples for applying the class-vc command to ATM PVC, SVC, and VC bundle members.

In the following example, a class called classA is first created and then applied to an ATM PVC:

! The following commands create the class classA:
vc-class atm classA
 ubr 10000
 encapsulation aal5mux ip
 
! The following commands apply classA to an ATM PVC:
interface atm 2/0
 pvc router5 1/32
 class-vc classA

In the following example, a class called classA is first created and then applied to the bundle member called vcmember, a member of bundle1:

! The following commands create the class classA:
vc-class atm classA
 precedence 6-5
 no bump traffic
 protect group
 bump explicitly 7
 vbr-nrt 20000 10000 32
 
! The following commands create bundle1, add vcmember to bundle1, and then applies classA
! to vcmember:
bundle bundle1
 pvc-bundle vcmember
  class-vc classA
 

Taking into account hierarchy precedence rules, the VC bundle member vcmember will be characterized by these parameters:

• It carries traffic whose IP Precedence level is 6 and 5.

• It does not allow other traffic to be bumped onto it. When the VC goes down, its bumped traffic will be redirected to a VC whose IP Precedence level is 7.

• It is a member of the protected group of the bundle. When all members of a protected group go down, the bundle goes down.

• It has Variable Bit Rate-Non Real Time (VBR-NRT) quality of service traffic parameters.

Related Commands

Command	Description
abr	Selects ABR QoS and configures output peak cell rate and output minimum guaranteed cell rate for an ATM PVC or VC class.
broadcast	Configures broadcast packet duplication and transmission for an ATM VC class, PVC, SVC, or VC bundle.
bump	Configures the bumping rules for a VC class that can be assigned to a VC bundle.
bundle	Creates a bundle or modifies an existing bundle to enter bundle configuration mode.
class-bundle	Configures a VC bundle with the bundle-level commands contained in the specified VC class.
encapsulation aal5	Configures the AAL and encapsulation type for an ATM PVC, SVC, or VC class.
idle-timeout	Configures the idle timeout parameter for tearing down an ATM SVC connection.
ilmi manage	Enables ILMI management on an ATM PVC.
inarp	Configures the Inverse ARP time period for an ATM PVC, VC class, or VC bundle.
oam-pvc	Enables end-to-end F5 OAM loopback cell generation and OAM management for an ATM PVC or VC class.
oam retry	Configures parameters related to OAM management for an ATM PVC, SVC, VC class, or VC bundle.
oam-svc	Enables end-to-end F5 OAM loopback cell generation and OAM management for an ATM SVC or VC class.
precedence (VC bundle)	Configures precedence levels for a VC member of a bundle, or for a VC class that can be assigned to a VC bundle.
protect	Configures a VC class with protected group or protected VC status for application to a VC bundle member.
protocol (ATM)	Configures a static map for an ATM PVC, SVC, VC class, or VC bundle. Enables Inverse ARP or Inverse ARP broadcasts on an ATM PVC by either configuring Inverse ARP directly on the PVC, on the VC bundle, or in a VC class (applies to IP and IPX protocols only).
pvc-bundle	Adds a PVC to a bundle as a member of the bundle and enters bundle-vc configuration mode in order to configure that PVC bundle member.
show atm bundle	Displays the bundle attributes assigned to each bundle VC member and the current working status of the VC members.
show atm bundle statistics	Displays statistics on the specified bundle.
show atm map	Displays the list of all configured ATM static maps to remote hosts on an ATM network.
ubr	Configures UBR QoS and specifies the output peak cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
ubr+	Configures UBR QoS and specifies the output peak cell rate and output minimum guaranteed cell rate for an ATM PVC, SVC, VC class, or VC bundle member.
vbr-nrt	Configures the VBR-NRT QoS and specifies output peak cell rate, output sustainable cell rate, and output maximum burst cell size for an ATM PVC, SVC, VC class, or VC bundle member.
vc-class atm	Configures a VC class for an ATM VC or interface.

The dxi map command can be used only on a serial interface or HSSI configured for ATM-DXI encapsulation.

interface serial 0
 dxi map ip 172.21.170.49 2 46 broadcast
 

Using the mapping defined in Annex A of the ATM DXI Specification, the router uses the VPI and VCI information in this example to compute a DFA of 558 (binary 1000101110). The ADSU will use the DFA of the incoming frame to extract the VPI and VCI information when formulating ATM cells.

Related Commands

Command	Description
dxi pvc	Configures multiprotocol or single protocol ATM-DXI encapsulation.
encapsulation atm-dxi	Enables ATM-DXI encapsulation.

Select the nlpid option if software earlier than Cisco IOS Release 10.3 was loaded on this router, and the router was configured for the default encapsulation, which was nlpid before Release 10.3.

interface serial 1
 dxi pvc 10 10 mux
 dxi map ip 172.21.176.45 10 10 broadcast
 

The following example configures ATM-DXI NLPID encapsulation on serial interface 1. The PVC identified by a VPI of 11 and a VCI of 12 can carry multiprotocol traffic that is encapsulated with a header described in RFC 1294/1490.

interface serial 1
 dxi pvc 11 12 nlpid

Related Commands

Command	Description
class-int	Maps a protocol address to a given VPI and VCI.
encapsulation atm-dxi	Enables ATM-DXI encapsulation.
show dxi pvc	Displays the PVC statistics for a serial interface.

Note To configure Integrated Local Management Interface (ILMI), QSAAL, or Switched Multimegabit Data Service (SMDS) encapsulations for an ATM PVC, use the pvc command.

Syntax Description

encap

AAL and encapsulation type. When mux is specified, a protocol is required. Possible values for the aal-encap argument are as follows: ciscoppp---For Cisco Point-to-Point Protocol (PPP) over ATM. Supported on ATM PVCs only. mux apollo---For a multiplex (MUX)-type VC using the Apollo protocol. mux appletalk---For a MUX-type VC using the AppleTalk protocol. mux decnet---For a MUX-type VC using the DECnet protocol. mux frame---For a MUX-type VC for Frame Relay-ATM Internetworking on the Cisco MC3810 router. mux frame-relay---For a MUX-type virtual circuit for Frame Relay-ATM Network Interworking (FRF.5) on the Cisco MC3810. mux fr-atm-srv---For a MUX-type virtual circuit for Frame Relay-ATM Service Interworking (FRF.8) on the Cisco MC3810. mux ip---For a MUX-type VC using the IP protocol. mux ipx---For a MUX-type VC using the IPX protocol. mux ppp---For a MUX-type virtual circuit running IETF-Compliant PPP over ATM. You must use the virtual-template number argument to identify the virtual template. (If you need to establish a virtual template, use the interface virtual-template command.) mux vines---For a MUX-type VC using the VINES protocol. mux voice---For a MUX-type VC for Voice over ATM on the Cisco MC3810 router.

Syntax Description

mux xns---For a MUX-type VC using the XNS protocol. nlpid---Allows ATM interfaces to interoperate with High-Speed Serial Interfaces (HSSIs) that are using an ATM data service unit (ADSU) and running ATM-Data Exchange Interface (DXI). Supported on ATM PVCs only. snap---The only encapsulation supported for Inverse ARP. Logical Link Control/Subnetwork Access Protocol (LLC/SNAP) precedes the protocol datagram.

virtual-template number

(Optional) (This argument is required for ciscoppp encapsulation only.) Specifies the number used to identify the virtual template.

Defaults

The global default encapsulation is snap. See the "Usage Guidelines" section for other default characteristics.

Command Modes

Interface-ATM-VC configuration (for an ATM PVC or SVC)

VC-class configuration (for a VC class)

Command History

Release	Modification
11.3 T	This command was introduced.
12(0)3T	This command was enhanced to provide encapsulation configuration for ATM VC bundles. The mux frame and mux voice options were added for the Cisco MC3810 series router.
12.0(7)T	The mux fr-atm-srv option was added for the Cisco MC3810 series router. The mux frame option was changed to mux frame-relay.

Usage Guidelines

Use one of the mux encapsulation options to dedicate the specified PVC to a single protocol; use the snap encapsulation option to multiplex two or more protocols over the same PVC. Whether you select mux or snap encapsulation might depend on practical considerations, such as the type of network and the pricing offered by the network. If the network's pricing depends on the number of PVCs set up, snap might be the appropriate choice. If pricing depends on the number of bytes transmitted, mux might be the appropriate choice because it has slightly less overhead.

To use this command to configure a VC bundle, first enter the bundle subinterface configuration command to create a new bundle or modify an existing one and to enter bundle configuration mode.

Note When a VC is a member of a VC bundle, configuration using the encapsulation aal5 command in VC class mode no longer applies to the VC. Bundle configuration takes precedence.

When configuring Cisco PPP over ATM, specify the ciscoppp encapsulation for the aal-encap argument and specify the virtual template number.

It is possible to implicitly create a virtual template when configuring Cisco PPP over ATM. In other words, if the parameters of the virtual template are not explicitly defined before you configure the ATM PVC, the PPP interface will be brought up using default values from the virtual template identified. However, some parameters (such as an IP address) take effect only if they are specified before the PPP interface comes up. Therefore, we recommend that you explicitly create and configure the virtual template before configuring the ATM PVC to ensure such parameters take effect.

If you specify virtual template parameters after the ATM PVC is configured, you should enter a shutdown command followed by a no shutdown command on the ATM subinterface to restart the interface, causing the newly configured parameters (such as an IP address) to take effect.

If the encapsulation aal5 command is not explicitly configured on an ATM PVC, SVC, or VC bundle, the VC inherits the following default configuration (listed in order of next highest precedence):

• Configuration of the encapsulation aal5 command in a VC class assigned to the PVC, PVC bundle, or SVC itself.

• Configuration of the encapsulation aal5 command in a VC class assigned to the PVC's, SVC's, or VC bundle's ATM subinterface.

• Configuration of the encapsulation aal5 command in a VC class assigned to the PVC's, SVC's, or VC bundle's ATM main interface.

• Global default: encap = snap.

Examples

The following example configures an ATM PVC with VPI 0 and VCI 33 for a MUX-type encapsulation using IP:

pvc 0/33
 encapsulation aal5mux ip
 

The following example configures a bundle called chicago for aal5snap encapsulation:

bundle chicago
 encapsulation aal5snap

Related Commands

Command	Description
broadcast	Configures broadcast packet duplication and transmission for an ATM VC class, PVC, SVC, or VC bundle.
class-int	Assigns a VC class to an ATM main interface or subinterface.
class-vc	Assigns a VC class to an ATM PVC, SVC, or VC bundle member.
inarp	Configures the Inverse ARP time period for an ATM PVC, VC class, or VC bundle.
oam-bundle	Enables end-to-end F5 OAM loopback cell generation and OAM management for a virtual circuit class that can be applied to a virtual circuit bundle.
oam retry	Configures parameters related to OAM management for an ATM PVC, SVC, VC class, or VC bundle.
protocol (ATM)	Configures a static map for an ATM PVC, SVC, VC class, or VC bundle. Enables Inverse ARP or Inverse ARP broadcasts on an ATM PVC by either configuring Inverse ARP directly on the PVC, on the VC bundle, or in a VC class (applies to IP and IPX protocols only).

interface serial 1
 encapsulation atm-dxi

Related Commands

Command	Description
class-int	Maps a protocol address to a given VPI and VCI.

Syntax Description

minutes

Number of minutes for the Inverse ARP time period.

Defaults

When Inverse ARP is enabled, minutes = 15 minutes.

Command Modes

Interface-ATM-VC configuration (for an ATM PVC)

VC-class configuration (for a VC class)

Bundle configuration (for a VC bundle)

Command History

Release	Modification
11.3 T	This command was introduced.
12.0(3)T	This command was enhanced to provide support to configure the Inverse ARP time period for an ATM VC bundle.

Usage Guidelines

This command is only supported for aal5snap encapsulation when Inverse ARP is enabled. Refer to the encapsulation command for configuring aal5snap encapsulation and the protocol command for enabling Inverse ARP.

If the inarp command is not explicitly configured on an ATM PVC, the PVC inherits the following default configuration (listed in order of next highest precedence):

• Configuration of the inarp command in a VC class assigned to the PVC itself.

• Configuration of the inarp command in a VC class assigned to the PVC's ATM subinterface.

• Configuration of the inarp command in a VC class assigned to the PVC's ATM main interface.

• Global default: minutes = 15 minutes; this default assumes that Inverse ARP is enabled.

Note As the inheritance rules imply, when a VC is a member of a VC bundle, configuration using the inarp command in VC class configuration mode no longer applies to that VC. Bundle configuration takes precedence.

For ATM VC bundle management, the Inverse ARP parameter can only be enabled at the bundle level and applied to all VC members of the bundle---that is, it cannot be enabled in bundle-vc configuration mode for individual VC bundle members. To use this command in bundle configuration mode, first enter the bundle command to create the bundle and enter bundle configuration mode.

Examples

The following example sets the Inverse ARP time period to 10 minutes:

inarp 10

Related Commands

Command	Description
bundle	Creates a bundle or modifies an existing bundle to enter bundle configuration mode.
broadcast	Configures broadcast packet duplication and transmission for an ATM VC class, PVC, SVC, or VC bundle.
class-int	Assigns a VC class to an ATM main interface or subinterface.
class-vc	Assigns a VC class to an ATM PVC, SVC, or VC bundle member.
encapsulation aal5	Configures the AAL and encapsulation type for an ATM PVC, SVC, or VC class.
oam-bundle	Enables end-to-end F5 OAM loopback cell generation and OAM management for a virtual circuit class that can be applied to a virtual circuit bundle.
oam retry	Configures parameters related to OAM management for an ATM PVC, SVC, VC class, or VC bundle.
protocol	Configures a static map for an ATM PVC, SVC, VC class, or VC bundle. Enables Inverse ARP or Inverse ARP broadcasts on an ATM PVC by either configuring Inverse ARP directly on the PVC, on the VC bundle, or in a VC class (applies to IP and IPX protocols only).

Cisco 7500 series with AIP; Cisco 7200 series with ATM, ATM-CES, and enhanced ATM port adapters; Cisco 2600 and 3600 series with 1-port ATM-25 network module

interface atm slot/0 subinterface-number {multipoint | point-to-point}

Cisco 7500 series with ATM and enhanced ATM port adapter

interface atm slot/port-adapter/0.subinterface-number {multipoint | point-to-point}

Cisco 4500 and 4700 series with NPM

interface atm number.subinterface-number {multipoint | point-to-point}

Cisco 2600 and 3600 series

interface atm slot/port.subinterface-number {multipoint | point-to-point}

Syntax Description

slot	Specifies the backplane slot number on your router. The value ranges from 0 to 4, depending on what router you are configuring. Refer to your router hardware documentation.
/0	ATM port number. Because the AIP and all ATM port adapters have a single ATM interface, the port number is always 0.
port-adapter	ATM port adapter number for the ATM port adapter or enhanced ATM port adapter on Cisco 7500 series routers. The value can be 0 or 1.
number	On Cisco 4500 and Cisco 4700 routers, specifies the NPM number. The numbers are assigned at the factory at the time of installation or when added to a system, and can be displayed with the show interfaces command.
port	ATM port number on a Cisco 2600 or 3600 series router, indicating the T1 or E1 link that you are configuring. Enter a value from 0 to 3 or from 0 to 7, depending on whether the network module has four ports or eight ports.
.subinterface-number	Subinterface number in the range 1 to 4294967293.
multipoint | point-to-point	Specifies a multipoint or point-to-point subinterface.

Defaults

None

Command Modes

Global configuration

Command History

Release	Modification
10.0	This command was introduced.

interface atm 1/0
 ip address 1.1.1.1.255.255.255.0
 

Related Commands

Command	Description
show interfaces atm	Displays information about the ATM interface.

Examples

The following example specifies the first T1 or E1 port on the ATM-CES port adapter in slot 1:

interface cbr 1/0

Related Commands

Command	Description
show ces interface cbr	Displays detailed CBR port information.
show interface cbr	Displays the information about the CBR interface on the ATM-CES port adapter.

Syntax Description

cell	(Optional) Places the interface into external loopback at cell level.
line	(Optional) Places the interface into external loopback at the line.
payload	(Optional) Places the interface into external loopback at the payload level.

Defaults

line

Command Modes

Interface configuration

Command History

Release	Modification
11.0	This command was introduced.
11.1	The following keywords were removed: diagnostic test

Usage Guidelines

This command is useful for testing because it loops all packets from the ATM interface back to the interface as well as directing the packets to the network.

Use the loopback line command to check that the PA-A3 port adapter is working by looping the receive data back to the transmit data.

interface atm 4/0
 loopback

Related Commands

Command	Description
ces dsx1 loopback	Enables a loopback for the CBR interface.

You can specify up to four clock priorities. The highest priority active interface in the router supplies primary reference source to all other interfaces that require network clock synchronization services. The fifth priority is the local oscillator on the ATM-CES port adapter.

Use the show network-clocks command to display currently configured clock priorities on the router.

Examples

The following example defines two clock priorities on the router:

network-clock-select 1 cbr 2/0
network-clock-select 2 atm 2/0

Related Commands

Command	Description
ces aal1 clock	Configures the AAL1 timing recovery clock for the CBR interface.
ces dsx1 clock source	Configures a transmit clock source for the CBR interface.
show network-clocks	Displays which ports are designated as network clock sources.