Priority flow control, Lldp configuration guidelines and restrictions – Brocade Network OS Administrator’s Guide v4.1.1 User Manual
Page 452
ETS priority grouping of IPC, LAN, and SAN traffic (Continued)
TABLE 73
Priority
Priority group
Bandwidth check
6
2
Yes
5
2
Yes
4
2
Yes
3
1
Yes
2
1
Yes
1
2
Yes
0
2
Yes
Priority Flow Control
With Priority Flow Control (PFC), it is important to provide lossless frame 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).
NOTE
When PFC is enabled, the Brocade VDX 6740 series platforms support up to three PGIDs with the
execution of cee-map default . By default, PGID 1 (with TC3) and PGID 15.0 (for network control
traffic) are enabled when PFC is enabled.
LLDP configuration guidelines and restrictions
Follow these LLDP configuration guidelines and restrictions when configuring LLDP:
• Brocade’s implementation of LLDP supports Brocade-specific TLV exchange in addition to the
standard LLDP information.
• Mandatory TLVs are always advertised.
• The exchange of LLDP link-level parameters is transparent to the other Layer 2 protocols. The
LLDP link-level parameters are reported by LLDP to other interested protocols.
NOTE
DCBX configuration simply involves configuring DCBX-related TLVs to be advertised. Detailed
information is provided in
on page 453.
Priority Flow Control
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Network OS Administrator’s Guide
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