Brocade Communications Systems 53-1001761-01 Manual De Usuario
106
Converged Enhanced Ethernet Administrator’s Guide
53-1001761-01
Converged Enhanced Ethernet map configuration
9
DRAFT: BROCADE CONFIDENTIAL
Converged Enhanced Ethernet map configuration
The CEE QoS covers frame classification, priority and traffic class (queue) mapping, congestion
control, and scheduling. Under the CEE Provisioning model all of these features are configured
utilizing two configuration tables, Priority Group Table and Priority Table.
control, and scheduling. Under the CEE Provisioning model all of these features are configured
utilizing two configuration tables, Priority Group Table and Priority Table.
CEE 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 CEE Priority Group Table.
Priority versus DWRR, DWRR weight, relative priority), and partially defines the congestion control
(PFC) configuration. There are 16 rows in the CEE Priority Group Table.
presents the
default CEE Priority Group Table configuration.
NOTE
Only a single CoS can be mapped to a PFC-enabled priority queue. The CoS number must be
identical to the priority queue number. If your configuration violates this restriction an error message
displays and the Priority Group Table is set back to the default values.
identical to the priority queue number. If your configuration violates this restriction an error message
displays and the Priority Group Table is set back to the default values.
When the CEE map is applied, and the interface is connected to the CNA, only one strict priority PGID
(PGID 15.0 to PGID 15.7) is allowed.
(PGID 15.0 to 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 congestion control because the set of priorities mapped to the Priority Group is not
known, which leads into the CEE Priority Table.
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 congestion control because the set of priorities mapped to the Priority Group is not
known, which leads into the CEE Priority Table.
TABLE 21
Default CEE Priority Group Table configuration
PGID
Bandwidth%
PFC
15.0
—
N
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
N
2
0
N
3
0
N
4
0
N
5
0
N
6
0
N
7
0
N