Brocade Communications Systems Converged Enhanced Ethernet 8000, Руководство администратора

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Converged Enhanced Ethernet Administrator’s Guide 111
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Queueing
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DRAFT: BROCADE CONFIDENTIAL
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.
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.
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