Cabletron Systems 9032578-05 manual Traffic Prioritization for Layer-3 & Layer-4 Flows

Chapter 21: QoS Configuration Guide

configured to use the default priority map only. If the commands to create and apply priority maps exist in the active configuration, they will remain in the configuration but be ineffective.

To disable the use of priority maps, enter the following command in Configure mode:

Disable use of per- port priority maps on the SSR.

qos priority-map off

If the above command is negated, ports on the SSR can use per-port priority maps. If the commands to create and apply priority maps exist in the active configuration, they are reapplied.

Displaying Priority Map Information

To display priority maps and the ports on which they are applied, enter the following command in Enable mode:

Display priority mapping.

qos show priority-map <name>all

Traffic Prioritization for Layer-3 & Layer-4 Flows

QoS policies applied at layer-3 and 4 allow you to assign priorities based on specific fields in the IP and IPX headers. You can set QoS policies for IP flows based on source IP address, destination IP address, source TCP/UDP port, destination TCP/UDP port, type of service (TOS) and transport protocol (TCP or UCP). You can set QoS policies for IPX flows based on source network, source node, destination network, destination node, source port and destination port. A QoS policy set on an IP or IPX flow allows you to classify the priority of traffic based on:

•Layer-3 source-destination flows

•Layer-4 source-destination flows

•Layer-4 application flows

Configuring IP QoS Policies

To configure an IP QoS policy, perform the following tasks:

1.Identify the Layer-3 or 4 flow and set the IP QoS policy.

2.Specify the precedence for the fields within an IP flow.

296 SmartSwitch Router User Reference Manual