Brocade Communications Systems 53-1002163-02 manual Traffic class mapping, Unicast traffic

Queueing 11

3.Activate or apply changes made to the CoS-to-CoS mutation QoS map name. In this example ‘test’ is used.

switch(conf-if-te-0/2)#qos map cos-mutation test

4. Specify the trust mode for incoming traffic.

Use this command to specify the interface ingress QoS trust mode, which controls user priority mapping of incoming traffic. The untrusted mode overrides all incoming priority markings with the Interface Default CoS. The CoS mode sets the user priority based on the incoming CoS value, if the incoming packet is not priority tagged, then fallback is to the Interface Default CoS value.

switch(conf-if-te-0/2)#qos trust cos

5. Enter the copy command to save the running-config file to the startup-config file.

switch(conf-if-te-0/2)#do copy running-config startup-config

Traffic class mapping

Fabric OS v7.0.0 supports eight unicast traffic classes for isolation and to control servicing for different priorities of application data. Traffic classes are numbered from 0 through 7, with higher values designating higher priority.

The traffic class mapping stage provides some flexibility in queue selection:

•The mapping may be many-to-one, such as mapping one byte user priority (256 values) to eight traffic classes.

•There may be a non-linear ordering between the user priorities and traffic classes.

Unicast traffic

Table 25 presents the Layer 2 default traffic class mapping supported for a COS-based user priority to conform to 802.1Q default mapping.

TABLE 25	Default user priority for unicast traffic class mapping
User priority	Traffic class
0	1
1	0
2	2
3	3
4	4
5	5
6	6
7	7

You are allowed to override these default traffic class mappings per port. Once the traffic class mapping has been resolved it is applied consistently across any queueing incurred on the ingress and the egress ports.

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