Configuring VC Classes

To configure a VC class, you issue the vc-class atm command to create and name the VC class. The vc-class atm command accesses ATM VC Class Configuration mode, from which you configure a set of attributes to apply to an ATM data PVC.

Table 9 lists the commands that you can use in ATM VC Class Configuration mode to configure a set of attributes for a data PVC. These commands are identical to the commands in ATM VC Configuration mode described in Configuring Individual ATM PVC Parameters. For more information about the syntax of each command, see the JUNOSe Command Reference Guide.

Table 9: Commands to Configure VC Class Attributes

For example, the following commands configure two VC classes: premium-subscriber-class and dsl-subscriber-class. You must issue the exit command from ATM VC Class Configuration mode for each VC class configuration to take effect.

In premium-subscriber-class:

• The encapsulation command sets the encapsulation method to aal5autoconfig.
• The cbr command sets the service category to CBR with a PCR of 200 Kbps.
• The oam-pvc command enables generation of F5 OAM loopback cells and F5 OAM VC integrity.
• The oam ais-rdi command configures the alarm down count for successive AIS and RDI alarm cells to 5.

In dsl-subscriber-class:

• The encapsulation command sets the encapsulation method to aal5autoconfig.
• The ubr command configures the UBR service category without a PCR.

To configure an ATM VC class with systemwide default values, you can issue the vc-class atm command followed immediately by the exit command. For example, the following commands create a VC class named default-vc-class. Because no attribute values are explicitly specified in default-vc-class, the router applies the default values for the commands listed in Table 9. For information about the default value for each command, see the command descriptions in this section.

To verify the VC class configuration, use the show atm vc-class command. For information about how to use this command, see show atm vc-class.

cbr

• Use to configure the CBR service category on an ATM data PVC.
• For detailed information about how to use this command, see cbr.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#cbr 15000

  host1(config-vc-class)#exit

• Use the no version to restore the default service category, UBR without a PCR.
• See cbr.

encapsulation

• Use to configure the encapsulation method on an ATM data PVC.
• For detailed information about how to use this command, see encapsulation.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#encapsulation aal5mux ip

  host1(config-vc-class)#exit

• Use the no version to restore the default encapsulation method, aal5snap.
• See encapsulation.

inarp

• Use to enable Inverse ARP on an ATM PVC that resides on an ATM 1483 NBMA subinterface and uses the default encapsulation method, aal5snap.
• For detailed information about how to use this command, see inarp.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#inarp 5

  host1(config-vc-class)#exit

• Use the no version to restore the default behavior, which disables Inverse ARP on the router.
• See inarp.

oam ais-rdi

• Use to configure surveillance parameters for AIS and RDI F5 OAM fault management cells on an ATM data PVC.
• For detailed information about how to use this command, see oam ais-rdi.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#oam ais-rdi 5 10

  host1(config-vc-class)#exit

• Use the no version to restore the default values for the alarm down count (1 successive alarm cell) and alarm clear timeout duration (3 seconds).
• See oam ais-rdi.

oam cc

• Use to enable F5 OAM CC verification on an ATM data PVC.
• For detailed information about how to use this command, see oam cc.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example 1—Enables CC verification with a source endpoint

  host1(config-vc-class)#oam cc source

  host1(config-vc-class)#exit

• Example 2—Opens an F5 OAM CC segment cell flow and enables CC verification with a sink endpoint

  host1(config-vc-class)#oam cc segment sink

  host1(config-vc-class)#exit

• Use the no version to disable F5 OAM CC verification and restore the default setting for cell termination, end-to-end.
• See oam cc.

oam-pvc

• Use to enable generation of F5 OAM loopback cells on an ATM data PVC and, optionally, enable F5 OAM VC integrity features on the circuit.
• For detailed information about how to use this command, see oam-pvc.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#oam-pvc manage 15

  host1(config-vc-class)#exit

• Use the no version to restore the default behavior, which disables F5 OAM VC integrity on the router and restores the default value for loopback frequency, 10 seconds.
• See oam-pvc.

oam retry

• Use to configure F5 OAM VC integrity parameters on an ATM data PVC.
• For detailed information about how to use this command, see oam retry.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#oam retry 5 6 3

  host1(config-vc-class)#exit

• Use the no version to restore the default values for the up retry count (3 successive loopback cell responses), down retry count (5 successive loopback cell responses), and retry frequency (1 second).
• See oam retry.

ubr

• Use to configure the UBR service category on an ATM data PVC.
• For detailed information about how to use this command, see ubr.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#ubr 5000

  host1(config-vc-class)#exit

• Use the no version to restore the default service category, UBR without a PCR.
• See ubr.

vbr-nrt

• Use to configure the VBR-NRT service category on an ATM data PVC.
• For detailed information about how to use this command, see vbr-nrt.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#vbr-nrt 50000 10000 150

  host1(config-vc-class)#exit

• Use the no version to restore the default service category, UBR without a PCR.
• See vbr-nrt.

vbr-rt

• Use to configure the VBR-RT service category on an ATM data PVC.
• For detailed information about how to use this command, see vbr-rt.
• You must issue the exit command from ATM VC Class Configuration mode for the configuration to take effect.
• Example

  host1(config-vc-class)#vbr-rt 200000 30000 400

  host1(config-vc-class)#exit

• Use the no version to restore the default service category, UBR without a PCR.
• See vbr-rt.

vc-class atm

• Use to create and name a VC class for an ATM data PVC.
• You must specific a VC class name of up to 32 alphanumeric characters.
• The vc-class atm command accesses ATM VC Class Configuration mode, from which you can configure a set of attributes for the PVC including the service category, encapsulation method, F5 OAM options, and Inverse ARP.
• You must issue the exit command from ATM VC Class Configuration mode for the VC class configuration to take effect.
• For information about the total number of VC classes supported on the router, see JUNOSe Release Notes, Appendix A, System Maximums.
• Example

  host1(config)#vc-class atm dsl-subscriber-class

  host1(config-vc-class)#exit

• Use the no version to remove the named VC class from the router. You cannot remove a VC class that is currently assigned to at least one ATM PVC, ATM 1483 subinterface, or ATM major interface without first issuing the no class-vc command or the no class-int command to remove the VC class association with the PVC, interface, or subinterface.
• See vc-class atm.

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.