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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.
The following table describes the default mapping:
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 VoIP phone SIP
4
3
Video
5
4
Voice Cisco IP phone default
6
4
Interwork Control VoIP phone RTP
7
4
Network Control
By changing the CoS/802.1p to Queue mapping (CoS/802.1p to Queue page), the Queue
schedule method (Queue Scheduling page) and bandwidth allocation (Bandwidth page), it is
possible to achieve the desired quality of service in a network.
The CoS/802.1p to Queue mapping is applicable only if one of the following exists:
•
The device is in QoS Basic mode and CoS/802.1p trusted mode
•
Queue 1 has the lowest priority; queue 4 has the highest priority.
To map CoS /802.1p values to egress queues:
1. Click
Configure> Quality of Service > CoS/802.1p to Queue
.
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.
Either four or eight 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.