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The CoS/802.1p to Queue page maps 802.1p priorities to egress queues. The CoS/802.1p to
Q
ueue 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 egre
ss
q
ueue, 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 Configuratio
n
f
ile is updated.
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