Nortel 5530 Engineering Manual

Also see for 5510: Installation Configuration Specifications

Contents

Filters and QoS Configuration for ERS 5500Technical Configuration Guide v2.0 NN48500-559___________________________________________________________________________________________________________________________Nortel Confidential Information Copyright © 2008 Nortel Networks. All Rights Reserved.External Distribution 144. Queue SetsPrior to software release 4.0, the Ethernet Routing Switch 5500 supported a single queue set witheight queues, one absolute queue and seven WRR queues.With the introduction of software release 4.0, eight different queue sets where made available.Each queue set has different characteristics in regards to number of queues and service weightsallowing the user to select a queue set based on the user’s particular needs. With eight queuesettings and three resource sharing options, the Ethernet Routing Switch 5500 supports a total of24 different queues and buffer setting combinations. Prior to making any changes to the egressqueue, the buffer resource sharing feature must be enabled.Resource SharingThe three (3) possible resource sharing settings in version 4.0 or greater software release areregular, large, and maximum. These settings allow the user to change the amount of bufferwhich can be allocated or shared to any port. Note that the switch must be rebooted if anychanges are made.Table 4: Ethernet Routing Switch 5500 Resource SharingSetting DescriptionRegular 1 port may use up to 16% of the buffers for a group of 12 ports.Large 1 port may use up to 33% of the buffers for a group of 12 ports.Maximum 1 port may use 100% of the buffers for a group of 12 ports.Resource Sharing Commands• 5520-24T-PWR(config)# qos agent buffer The qos agent buffer command allows the user to specifythe level of resource sharing on the switch. This parameter is global and requires a resetto activate a change. This command is in the CLI priv-exec mode.• 5520-24T-PWR(config)# default qos agent bufferThe default qos agent buffer command sets the switches agent buffer back to a defaultsetting of regular. In order for this command to take affect, a reset of the switch mustoccur. This command is in the CLI priv-exec mode.Resource Sharing RecommendationsL Nortel Networks recommends you use the default resource-sharing setting of regular. Ifyou change the setting, the resulting performance may increase for some ports, and attimes, decrease for other ports.Generally speaking, smaller buffers achieve lower latency (RTT) but reduce the throughput abilitywhich is better for VoIP etc. and sensible jitter application.You should use the Maximum resource sharing setting:• If you are using your 5520 for big file transfers (like backup of servers)