Shared-Queue Qos Policies - Alcatel-Lucent 7450 Quality Of Service Manual

Ethernet service switch; service router; extensible routing system

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This section provides information to configure shared-queue QoS policies using the

command line interface.

Topics in this section include:

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

Quality of Service Guide

Shared-Queue QoS Policies

Basic Configurations

Default Shared Queue Policy Values