Basic Configurations - 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 Named Pools QoS policies using the

command line interface.

Topics in this section include:

The named buffer pool feature allows for the creation of named buffer pools at the XMA,

MDA and port level. Named pools allow for a customized buffer allocation mode for ingress

and egress queues that goes beyond the default pool behavior.

Named pools are defined within a named pool policy. The policy contains a q1-pools context

which is used to define port allocation weights and named pools for buffer pools on Q1 based

IOMs (all IOMs that are currently supported). The policy may be applied at either the port or

XMA or MDA level at which time the pools defined within the policy are created on the port

or XMA/MDA. When the policy is applied at the XMA or MDA level, XMA or MDA named

pools are created. XMA or MDA named pools will typically be used when either a pool

cannot be created per port or when the buffering needs of queues mapped to the pool are not

affected by sharing the pool with queues from other ports. XMA or MDA named pools allow

buffers to be efficiently shared between queues on different ports mapped to the same pool.

However, XMA or MDA named pools do present the possibility that very active queues on

one port could deplete buffers in the pool offering the possibility that queues on other ports

experiencing buffer starvation. Port named pools are created when the policy is applied at the

port level and allow for a more surgical application of the buffer space allocated for a physical

port. XMA or MDA pool names do not need to be unique. If a name overlaps exists, the port

pool will be used. The same pool name may be created on multiple ports on the same XMA

Quality of Service Guide

Basic Configuration