Quality of Service
General
420 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
23
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.
The following table describes the default mapping when there are 8 queues:
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.
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
• The device is in QoS Advanced mode and the packets belong to flows that are CoS/
802.1p trusted
802.1p Values
(0-7, 7 being the
highest)
Queue
(8 queues 1-8, 8
is the highest
priority)
7 Queues
(8 is the highest
priority used for
stack control traffic)
Stack
Notes
011 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
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