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Traffic Prioritization for Layer-2 Flows

314 Enterasys Xpedition User Reference Manual

The VLAN ID in the QoS configuration must match the VLAN ID assigned to the list of

ports to which the QoS policy is applied. In a layer-2 only configuration, each port has

only one VLAN ID associated with it and the QoS policy should have the same VLAN ID.

When different VLANs are assigned to the same port using different protocol VLANs, the

layer-2 QoS policy must match the VLAN ID of the protocol VLAN.

Note: In flow mode, you can also ignore the source MAC address and configure the

priority based on the destination MAC address only.

Configuring Layer-2 QoS

When applying QoS to a layer-2 flow, priority can be assigned as follows:

• 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 VLAN

trunk ports, the frame is assigned an 802.1Q priority. Select a number from 0 to 7.

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

802.1p Priority Mapping

The following table shows the default mapping of 802.1p class of service (CoS) values to

internal priorities for frames that are received on a port on the XP:

You can create one or more priority maps that are different from the default priority map

and then apply these maps to some or all ports of the XP. The new priority mapping

replaces the default mappings for those ports to which they are applied.

Set a Layer-2 QoS

policy.

qos set l2 name <name> source-mac <MACaddr>

dest-mac

in-port-list

<port-list> priority control|high|medium|low|<trunk-

priority>

Table 10: Default Priority Map

802.1p CoS

Val ues

Internal Priority

Queue

1, 2 Low

0, 3 Medium

4, 5 High

6, 7 Control

1 2 ... 329 330 331 332 333 334 335 336 337 338 339 ... 393 394

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