Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

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The following commands change the service category for the PVC to VBR-RT because
this is 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, which is still
assigned to the PVC.
host1(config)# interface atm 2/0.200
host1(config-subif)# pvc 200 0/200
host1(config-subif-vc)# vbr-rt 200 150 200
host1(config-subif-vc)# exit
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.
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Configuring ATM VC Classes
JUNOSe 11.1.x Link Layer Configuration Guide