Chapter 24 - Managing Buffers And Queues On 50-Series Modules; Overview; How Queues Work; Managing Buffers And Queues - Avaya P580 User Manual

Multiservice switches

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Table of Contents

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0

on 50-Series Modules

The following information and procedures provided in this chapter pertain

to layer 2 and layer 3 module configurations. Buffer management features

help you to optimize traffic throughput through the switch fabric.

This chapter provides the following information:

How Queues Work

Managing Buffers and Queues

For more information about the CLI commands that are mentioned in this

chapter, see Command Reference Guide for the Avaya P580 and P882

Multiservice Switches, Software Version 6.0

Frames are buffered in the I/O modules, before and after traversing the

switch. Each queue can hold 256K bytes. (Architecturally they can support

up to 1 MB each).

Each buffer is divided into two queues, one for High-priority Traffic and

one for Normal-priority Traffic. The factory default is for the high-priority

queue uses 20% (51K) of the buffer. The normal-priority queue uses the

remaining 80% (205K). These values can be modified using either the Web

Agent or SNMP.

* Note: When you change these values, you must reboot the switch

before they can take effect.

Less buffer memory gets assigned to the high-priority queue because the

high-priority queue gets serviced more frequently than the normal-priority

queue. Since a frame spends less time on the high-priority queue, less buffer

space is required for the queue.

The Service Ratio can be chosen to match traffic patterns and performance

requirements using a weighted round robin scheduling algorithm. The

available service ratios of the algorithm are defined in

"Managing Buffers