Foundry Networks Switch and Router Installation And Configuration Manual page 346

Foundry Switch and Router Installation and Configuration Guide
5. Select the QoS level:
• On a Chassis device, select a number from 0 – 7 from the QoS field's pulldown menu.
• On a Stackable device, select high or normal from the QoS field's pulldown menu.
6. If you are adding a new VLAN, click the Select Port Members button to display the Port Members dialog, as
shown in the following example.
7. Select the ports you are placing in the VLAN. To select a row, click on the checkbox next to the row number,
then click on the Select Row button.
8. When you finish selecting the ports, click on the Continue button to return to the Port VLAN configuration
dialog.
9. Click the Add button (to add a new VLAN) or the Modify button (if you are modifying an existing VLAN) to
save the change to the device's running-config file.
10. Select the Save link at the bottom of the dialog, then select Yes when prompted to save the configuration
change to the startup-config file on the device's flash memory.
Reassigning 802.1p Priorities to Different Queues
Tagged priority applies to tagged packets that come in from tagged ports. These packets have a tag in the header
that specifies the packet's VLAN ID and its 802.1p priority tag value, which is 3 bits long.
NOTE: This section applies to Chassis devices only.
By default, a Foundry device interprets the prioritization information in the 3-bit priority tag as follows.
This is the Foundry default interpretation for the eight prioritization values in every context (VLAN, static MAC
entry, IP access policy, and so on). If the VLAN for the packet uses the default priority (0, equal to the qosp0
queue), then the Foundry device uses the priority information in the packet to assign the packet to a queue on its
incoming port. However, if the VLAN or the incoming port itself has a higher priority than the packet's 802.1p
priority, the Foundry device uses the VLAN priority or incoming port priority, whichever is higher.
You can specify how the Foundry device interprets the 3-bit priority information by reassigning the priority levels to
other queues. For example, if you want the device to disregard the 802.1p priority and instead assign the priority
based on other items (VLAN, port, and so on), configure the device to set all the 802.1p priorities to the best-effort
11 - 14
Priority Level
6, 7
4, 5
2, 3
0, 1
Queue
qosp3
qosp2
qosp1
qosp0
December 2000