Mapping CoS/802.1p to a Queue

The CoS/802.1p to Queue page maps 802.1p priorities to egress queues. The CoS/802.1p to Queue Table determines the egress queues of the incoming packets based on the 802.1p priority in their VLAN Tags. For incoming untagged packets, the 802.1p priority will be the default CoS/802.1p priority assigned to the ingress ports.

Default Mapping Queues

802.1p Values
(0-7, 7 being the highest)

Queue
(4 queues 1- 4, 4 being the highest priority)

Queue
(2 queues: Normal and High)

Notes

0

1

Normal

Background

1

1

Normal

Best Effort

2

2

Normal

Excellent Effort

3

3

Normal

Critical Application
LVS phone SIP

4

3

Normal

Video

5

4

High

Voice
Cisco IP phone default

6

4

High

Interwork Control
LVS phone RTP

7

4

High

Network Control

By changing the CoS/802.1p to Queue mapping and the Queue schedule method and bandwidth allocation, it is possible to achieve the desired quality of services in a network.

The CoS/802.1p to Queue mapping is applicable only if one of the following exists:

Queue 1 has the lowest priority, queue 4 has the highest priority.

To map CoS values to egress queues:

  1. Click Quality of Service > General > CoS/802.1p to Queue. The CoS/802.1p to Queue page opens.
  2. Enter the parameters.
    • 802.1p--Displays the 802.1p priority tag values to be assigned to an egress queue, where 0 is the lowest and 7 is the highest priority.
    • Output Queue--Select the egress queue to which the 802.1p priority is mapped. Four egress queues are supported, where Queue 4 is the highest priority egress queue and Queue 1 is the lowest priority.
  3. For each 802.1p priority, select the Output Queue to which it is mapped.
  4. Click Apply. 801.1p priority values to queues are mapped, and the Running Configuration file is updated.