Configuring Modular QoS on Link Bundles on Cisco ASR 9000 Series Routers
QoS and Link Bundling
QC-157
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
QoS and Link Bundling
All Quality of Service (QoS) features, currently supported on physical interfaces and subinterfaces, are
also supported on all Link Bundle interfaces and subinterfaces. QoS is configured on Link Bundles in
the same way that it is configured on individual interfaces. However, the following points should be
noted:
• When a QoS policy is applied on a bundle (ingress or egress directions), the policy is applied at each
member interface. Any queues and policers in the policy map (ingress or egress directions) will be
replicated on each bundle member.
• If a QoS policy is not applied to a bundle interface or bundle VLAN, both the ingress and egress
traffic will use the per link members port default queue.
• Link bundle members may appear across multiple Network Processing Units and linecards. The
shape rate specified in the bundle policymap is not an aggregate for all bundle members. The shape
rate applied to the bundle will depend on the load balancing of the links. For example, if a policy
map with a shape rate of 10 Mbps is applied to a bundle with two member links, and if the traffic is
always load-balanced to the same member link, then an overall rate of 10 Mbps will apply to the
bundle. However, if the traffic is load-balanced evenly between the two links, the overall shape rate
for the bundle will be 20 Mbps.
Example 1 shows how a traffic policy is applied on an Ethernet link bundle, in the ingress direction. The
policy is applied to all interfaces that are members of the Ethernet link bundle.
Example 1 Applying a Traffic Policy to an Ethernet Link Bundle
interface Bundle-Ether bundle-id
service-policy input policy-1
end
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