Qos For Bridge-Group Virtual Interfaces; Qos On Bvi; Restrictions - Cisco ASR 9000 Series Configuration Manual

Configuring Modular QoS Congestion Management

QoS for Bridge-Group Virtual Interfaces

Integrated Routing and Bridging (IRB) provides the ability to route between a bridge group and a routed
domain with the help of Bridge-Group Virtual Interface (BVI).
The BVI is a virtual interface within the router that acts like a normal routed interface that does not support
bridging, but represents the comparable bridge group to routed interfaces within the router. The interface
number of the BVI is the number of the bridge group that the virtual interface represents. The number is the
link between the BVI and the bridge group.
For more information on IRB/ BVI, please refer the Cisco ASR 9000 Series Aggregation Services Router
Interface and Hardware Component Configuration Guide

QoS on BVI

QoS support on BVI will allow the application of the policy map directly on the virtual interface. This will
enable aggregate policing and marking on the virtual interface. The policy can be applied on either the ingress
or egress side of the BVI to mark and police traffic going to and from the bridge domain.
These are the QoS features supported on BVI QoS policy:
• Classification
• Policing (hierarchical, conform-aware, conditional marking)
• Marking

Restrictions

QoS on BVI does not support the following:
• Ethernet and SIP 700 linecards (supports only ASR9000 Enhanced Ethernet linecards).
• Bidirectional Forwarding Detection (BFD), Shared Policy Instance, L1 Overhead Accounting.
• VLAN tag, DEI classification and marking.
• Any queue QoS including shape/bandwidth, priority, bandwidth remaining, shaping, queue-limit, and
• Percentage policer at lower level without reference policer rate at upper level.
• QoS policy propagation using Border Gateway Protocol (BGP)
Note Queuing can be performed by marking the qos-group and then adding a interface policy that matches the
qos-group.
Limitations
• Scale Limitation: 2000 BVI ( 8 classes per policy)
• Policer Limitation: 8000 policers (per Network Processor)
random-detect.
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide, Release 6.1.x
QoS for Bridge-Group Virtual Interfaces
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