Editing The Dcb Map; Adding A Traffic Class Map - Brocade Communications Systems StoreFabric SN6500B Administrator's Manual

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Quality of Service configuration
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Editing the DCB map

The DCB map defines priority and priority group tables that support Enhanced Transmission
Selection (ETS). ETS allows bandwidth to be allocated based on priority settings through an
exchange of priority group tables.
To edit the DCB map, perform the following steps.
1. Select the DCB tab on the Switch Administration window.
2. Select the QoS tab.
3. Select the DCB Map tab.
4. Select the default DCB map, and click Edit.
5. Enter a precedence value in the Precedence field.
6. Create a new priority group by clicking Add next to the Priority Group table.
7.
8. Change the Priority Flow Control Status to Enabled to enable PFC for the entry.
9. Click OK.

Adding a traffic class map

CoS priorities can be mapped to traffic classes using a traffic class map.
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You can edit the DCB map. The DCB map defines priority and priority group tables that support
Enhanced Transmission Selection (ETS). ETS allows allocation of bandwidth to different traffic
classes. DCB maps also allow you to enable Priority Flow Control (PFC).
You can create a traffic class map. A traffic class map can be used to map a specific class of
traffic to a specific Class of Service (CoS).
The DCB Map Configuration dialog box displays.
The value is specified as a number. The allowable range is 1 to 100. The default is 1.
The precedence value controls QoS scheduling policies. The scheduler gives precedence to the
highest precedence value.
When the DCB Map Configuration dialog box displays, the default values shown in the Priority
Group Map match the IEEE 802.1Q recommendation for systems supporting eight traffic
classes. The Priority Group Map displays the Layer 2 Cos values mapped to Priority Group ID
(PGID). PGID values are in the form
Priority values run from 0 (highest priority) to 7 (lowest priority). Note that this is contrary to the
CoS values, which run from 7 (highest priority) to 0 (lowest priority).
An entry is added to the Priority Group table.
NOTE
When you add an entry, a PGID is automatically assigned. The PGID is an integer from 0 to 7.
The first added entry is given a PGID of 0, and the PGID increments by one for each additional
added entry until a PGID of 7 is reached.
Edit the Bandwidth entry to indicate the desired percentage of total bandwidth.
The new priority group displays in the Priority Group Map.
. A policy value of 15 indicates
<policy>.<priority>
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