Quality of Service Guide 641
Shared-Queue QoS Policies
In This Section
This section provides information to configure shared-queue QoS policies using the
command line interface.
Topics in this section include:
• Overview
• Basic Configurations
• Default Shared Queue Policy Values
Overview
Shared-queue QoS policies can be implemented to facilitate queue consumption on the
router. It is especially useful when VPLS, IES, and VPRN services are scaled to very high
numbers. Instead of allocating multiple hardware queues for each unicast queue defined in a
SAP ingress QoS policy, SAPs with the shared-queuing feature enabled only allocate one
hardware queue for each SAP ingress QoS policy unicast queue.
However, as a trade-off, the total amount of traffic throughput at the ingress of the node is
reduced because any ingress packet serviced by a shared-queuing SAP is recirculated for
further processing. This can reduce the bandwidth by half. Shared-queuing can add latency.
Network planners should consider these restrictions while trying to scale services on the
router.
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