Administrator's Guide v4.1.1 Manual

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 Configuring and managing LLDP on page 453.

Priority Flow Control

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