Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 480)

The DCB Priority Group Table defines each Priority Group ID (PGID) and its scheduling policy (Strict
Priority versus DWRR, DWRR weight, relative priority), and partially defines the congestion control
(PFC) configuration. There are 16 rows in the DCB Priority Group Table.
The table below presents the default DCB Priority Group Table configuration.
Default DCB Priority Group Table configuration TABLE 79
PGID Bandwidth% PFC
15.0 – Y
15.1 – N
15.2 – N
15.3 – N
15.4 – N
15.5 – N
15.6 – N
15.7 – N
0 0 N
1 0 Y
2 0 N
3 0 N
4 0 N
5 0 N
6 0 N
7 0 N
NOTE
Only a single CoS can be mapped to a PFC-enabled priority queue. The switch automatically maps
the CoS number to the same TC number when PFC is enabled. The PGID can be anything from 0
through 7. If your configuration violates this restriction an error message displays and the Priority
Group Table is set back to the default values. When the DCB map is applied, and the interface is
connected to the CNA, only one Strict Priority PGID (PGID 15.0 through PGID 15.7) is allowed.
Strict Priority versus DWRR is derived directly from the PGID value. All PGIDs with prefix 15 receive
Strict Priority scheduling policy, and all PGIDs in the range 0 through 7 receive DWRR scheduling
policy. Relative priority between Priority Group is exactly the ordering of entries listed in the table, with
PGID 15.0 being highest priority and PGID 7 being lowest priority. Congestion control configuration is
partially specified by toggling the PFC column On or Off. This provides only partial configuration of
Configuring QoS
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