Example 2: Changing The Encapsulation Method In The Vc Class; Example 3: Effect Of Using The Atm Pvc Command; Example 4: Overriding Radius Values - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

Copyright © 2010, Juniper Networks, Inc.
The following commands cause the router to retain the VBR-RT service category for the
PVC because it is still the most recent explicitly specified value for this attribute. The
router takes the values for the other attributes from the VC class my-premium-class.
host1(config)#interface atm 2/0.200
host1(config-subif)#pvc 200 0/200
host1(config-subif-vc)#class-vc my-premium-class
host1(config-subif-vc)#exit

Example 2: Changing the Encapsulation Method in the VC Class

The following commands change the value for the encapsulation method in the VC class
my-premium-class from aal5autoconfig to aal5snap. As a result, the router now uses
aal5snap instead of aal5autoconfig as the encapsulation method for the PVCs to which
this VC class is assigned.
host1(config)#vc-class atm my-premium-class
host1(config-vc-class)#encapsulation aal5snap
host1(config-vc-class)#exit

Example 3: Effect of Using the atm pvc Command

The following commands, which attempt to assign the my-premium-class VC class to
a PVC originally created with the atm pvc command, have no effect. The router interprets
all attribute values specified with the atm pvc command as explicitly specified values,
and therefore takes the values for these attributes from the atm pvc command instead
of from the VC class. As a result, the router continues to use aal5mux ip as the
encapsulation method for this PVC instead of the encapsulation method specified in the
VC class my-premium-class.
host1(config)#interface atm 2/0.300
host1(config-subif)#atm pvc 300 0 300 aal5mux ip
host1(config-subif)#pvc 300 0/300
host1(config-subif-vc)#class-vc my-premium-class
host1(config-subif-vc)#exit

Example 4: Overriding RADIUS Values

If RADIUS is configured to provide traffic parameters for PVCs, a more recent, explicitly
specified change in the VC class associated with that PVC overrides the PVC values
applied through RADIUS.
In the following example, assume that RADIUS has been configured to apply a service
category of CBR with a PCR of 400 Kbps to the PVC. Initially, the PVC uses the service
category configured in my-premium-class, CBR with a PCR of 200 Kbps. However, when
the subscriber logs in through RADIUS, the router applies the RADIUS-configured service
category, CBR with a PCR of 400 Kbps.
While the subscriber is still logged in, my-premium-class is modified to change the service
category to CBR with a PCR of 600 Kbps. Because this VC class modification results in
the most recent, explicitly specified value for the service category, the router now uses
CBR with a PCR of 600 Kbps as the service category for the PVC instead of the service
category configured through RADIUS.
host1(config)#interface atm 2/0.200
host1(config-subif)#pvc 200 0/200
Chapter 1: Configuring ATM
65