Cisco Cisco IOS Software Release 12.2(27)SBC

The router displays packet statistics for VLAN-group policies using the modular QoS command-line 
interface (MQC) show commands. Statistical information displayed for VLAN groups represents the 
aggregate traffic of all of the subinterface members of the specific VLAN group.

The router updates match-VLAN filter statistics only for the aggregate traffic through the VLAN groups.

 describes support for various features on the PRE2 and PRE3 when configured with the 

QoS—VLAN Tag-Based feature.

Use the following procedures to configure QoS—VLAN tag-based:

Aggregate priority queues

Not supported

Supported. 

Aggregate priority queues should be well within 
90% of the maximum rate to guarantee 
performance.

Aggregate WRED

Not supported

Supported

Allows a maximum of 8 profiles per class and a 
total of 21 profiles in a policy.

Bandwidth remaining ratio  Not supported

Supported at the parent level of VLAN QoS 
policies.

VLAN-group policies

Supports simultaneous VLAN-group policy 
and subinterface policies that are not part of 
the VLAN-group policy.

Does not support both VLAN-group policies and 
subinterface policies on the same link 
simultaneously.

Multiple levels of priority 
queues

Not supported

Supported 

Provides for 2 levels of priority queues.

Strict priority queues

Supported 

Supports a strict priority queue without a 
policer. However, we recommend that you 
use policers with the priority queue to avoid 
bandwidth starvation of other class queues.

No supported