Installation manual

4-298
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• This switch provides eight priority queues for each port. It is configured to use
Weighted Round Robin, which can be viewed with the show queue bandwidth
command. Inbound frames that do not have VLAN tags are tagged with the input
port’s default ingress user priority, and then placed in the appropriate priority queue
at the output port. The default priority for all ingress ports is zero. Therefore, any
inbound frames that do not have priority tags will be placed in queue 0 of the output
port. (Note that if the output port is an untagged member of the associated VLAN,
these frames are stripped of all VLAN tags prior to transmission.)
Example
The following example shows how to set a default priority on port 3 to 5:
Related Commands
show interfaces switchport (4-197)
queue cos-map
This command assigns class of service (CoS) values to the priority queues (i.e., hardware
output queues 0 - 3). Use the no form set the CoS map to the default values.
Syntax
queue cos-map queue_id [cos1 ... cosn]
no queue cos-map
• queue_id - The ID of the priority queue.
Ranges are 0 to 3, where 3 is the highest priority queue.
• cos1 .. cosn - The CoS values that are mapped to the queue ID. It is a
space-separated list of numbers. The CoS value is a number from 0 to 7, where
7 is the highest priority.
Default Setting
This switch supports Class of Service by using four priority queues, with Weighted
Round Robin queuing for each port. Eight separate traffic classes are defined in
IEEE 802.1p. The default priority levels are assigned according to
recommendations in the IEEE 802.1p standard as shown below.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Console(config)#interface ethernet 1/3
Console(config-if)#switchport priority default 5
Console(config-if)#
Table 4-78 Default CoS Values to Egress Queues
Queue
0123
Priority
1,2 0,3 4,5 6,7