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

Chapter 19: QoS Configuration Guide

•The frame gets assigned a priority within the switch. Select “low, medium, high or control”.

•The frame gets assigned a priority within the switch, AND if the exit ports are trunk ports, the frame is assigned an 802.1Q priority. Select a number from 0 to 7. The mapping of 802.1Q to internal priorities is the following: (0 = low) (1,2,3 =medium) (4,5,6 = high) (7 = control).

To set a QoS policy on a layer-2 flow, enter the following command in Configure mode:

Set a Layer-2 QoS policy.

qos set l2 name <name> source-mac <MACaddr> dest-mac <MACaddr> vlan <vlanID> in-port-list <port-list>priority controlhighmediumlow<trunk-priority>

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.

286 SmartSwitch Router User Reference Manual