Brocade Converged Enhanced Ethernet Administrator's Guide v6.1.2_cee (53-1001258-01, June 2009)

Converged Enhanced Ethernet Administrator’s Guide 83
53-1001258-01
DCBX interaction with other vendor devices
6
The priority settings shown in Table 13 are translated to priority groups in the Brocade 8000 CEE
switch.
Priority Flow Control (PFC)
With PFC, it is important to provide lossless packet delivery for certain traffic classes while
maintaining existing LAN behavior for other traffic classes on the converged link. This differs from
the traditional 802.3 PAUSE type of flow control where the pause affects all traffic on an interface.
PFC is defined by a one-byte bitmap. Each bit position stands for a user priority. If a bit is set, the
flow control is enabled in both directions (Rx and Tx).
DCBX interaction with other vendor devices
When the Brocade 8000 CEE switch interacts with other vendor devices, the other vendor devices
might not have support for the same DCBX version as the Brocade 8000 CEE switch.
The Brocade 8000 CEE switch supports two DCBX versions:
• CEE version (1.0.1)—Based on the CEE standard.
• Pre-CEE version.
To accommodate the different DCBX versions, the Brocade 8000 CEE switch provides the following
options.
• Auto-sense (plug and play)
This is the default. The Brocade 8000 CEE switch detects the version used by the link neighbor
and automatically switches between the CEE version and the pre-CEE version.
• CEE version
Forces the use of the CEE version for the link (auto-sense is off).
• Pre-CEE version
Forces the use of the pre-CEE version for the link (auto-sense is off).
TABLE 13 ETS priority grouping of IPC, LAN, and SAN traffic
Priority Priority group Bandwidth check
70 No
62 Yes
52 Yes
42 Yes
31 Yes
21 Yes
12 Yes
02 Yes