SMC Networks 100BASE-TX, 16 10BASE-T manual Queue cos-map, Mapping CoS Values

4 Command Line Interface

•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:

Console(config)#interface ethernet 1/3

Console(config-if)#switchport priority default 5

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-mapqueue_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.

	Table	4-58. Mapping CoS Values
Queue	0		1	2	3
Priority	1,	2	0, 3	4, 5	6, 7

Command Mode

Interface Configuration (Ethernet, Port Channel)

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