Chapter 19: QoS Configuration Guide

Specifying Precedence for an IPX QoS Policy

To specify the precedence for an IPX QoS policy, enter the following command in Configure mode:

Specify precedence for an IPX QoS policy.

qos precedence ipx [srcnet <num>] [srcnode <num>] [srcport <num>] [dstnet <num>] [dstnode <num>] [dstport <num>] [intf <num>]

Configuring SSR Queueing Policy

The SSR queuing policy is set on a system-wide basis. The SSR default queuing policy is strict priority. To change the queuing policy to weighted-fair queuing on the SSR, enter the following command in Configure mode:

Set queuing policy to weighted-fair.

qos set queuing-policy weighted-fair port

<port list>all-ports

If you want to revert the SSR queuing policy from weighted-fair to strict priority (default), enter the following command in Configure mode:

Revert the SSR queuing policy to strict priority.

negate <line within active-configuration containing qos set queuing-policy weighted-fair>

Allocating Bandwidth for a Weighted-Fair Queuing Policy

If you enable the weighted-fair queuing policy on the SSR, you can allocate bandwidth for the queues on the SSR. To allocate bandwidth for each SSR queue, enter the following command in Configure mode:

Allocate bandwidth for a weighted-fair queuing policy.

qos set weighted-fair control <percentage> high <percentage> medium <percentage> low <percentage> port <port list>all-ports

ToS Rewrite

In the Internet, IP packets that use different paths are subject to delays, as there is little inherent knowledge of how to optimize the paths for different packets from different applications or users. The IP protocol actually provides a facility, which has been part of the IP specification since the protocol’s inception, for an application or upper-layer protocol to specify how a packet should be handled. This facility is called the Type of Service (ToS) octet.

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SmartSwitch Router User Reference Manual

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Cabletron Systems SmartSwitch Configuring SSR Queueing Policy, ToS Rewrite, Specifying Precedence for an IPX QoS Policy