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 is the default CoS/802.1p priority assigned to the ingress ports.
Default Mapping for 4 Queues
|
802.1p Values
(0-7, 7 being the highest)
|
Queue
(4 queues 1-4, 4 being the highest priority)
|
|
Notes
|
| 0 |
1 |
|
Background |
| 1 |
1 |
|
Best Effort |
| 2 |
2 |
|
Excellent Effort |
| 3 |
3 |
|
Critical Application - LVS phone SIP |
| 4 |
3 |
|
Video |
| 5 |
4 |
|
Voice - Cisco IP phone default |
| 6 |
4 |
|
Interwork Control - LVS phone RTP |
| 7 |
4 |
|
Network Control |
Default Mapping for 8 Queues
|
802.1p Values
(0-7, 7 being the highest)
|
Queue
(8 queues 1-8, 8 is the highest priority) Standalone
|
7 Queues
(8 is the highest priority used for stack control traffic) (stack)
|
Notes
|
| 0 |
1 |
1 |
Background |
| 1 |
2 |
1 |
Best Effort |
| 2 |
3 |
2 |
Excellent Effort |
| 3 |
6 |
5 |
Critical Application - LVS phone SIP |
| 4 |
5 |
4 |
Video |
| 5 |
8 |
7 |
Voice - Cisco IP phone default |
| 6 |
8 |
7 |
Interwork Control
LVS phone RTP |
| 7 |
7 |
6 |
Network Control |
By changing the CoS/802.1p to Queue mapping (CoS/802.1p to Queue) and the Queue schedule method and bandwidth allocation (Queue page), it is possible to achieve the desired quality of service in a network.
CoS/802.1p to Queue mapping is applicable only if CoS/802.1p is the trusted mode and the packets belong to flows that are CoS trusted.
Queue 1 has the lowest priority, queue 4 or 8 has the highest priority.
To map CoS values to egress queues:
- Click Quality of Service > General > CoS/802.1p to Queue.
- 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. Either four or eight egress queues are supported, where Queue 4 or Queue 8 is the highest priority egress queue and Queue 1 is the lowest priority.
- For each 802.1p priority, select the Output Queue to which it is mapped.
- Click Apply. 801.1p priority values to queues are mapped, and the Running Configuration file is updated.