Fabric Port Configuration

This feature also configures the fabric between ingress and egress ports to optimize PFC behavior.

When the ingress and egress ports are located on separate BlackDiamond I/O modules or different nodes in a SummitStack, note that some older systems do not support the enhanced fabric mode required for PFC. The following applies:

For BlackDiamond 8800 switches, the BlackDiamond 8900-MSM128 is needed. If other MSMs are installed, a log message is issued indicating that system performance for PFC will not be optimal.
In a SummitStack, PFC cannot be enabled until the following command is executed:

configure stacking protocol enhanced

The fabric can be set up to support the flow control messages only in the following switches:

Summit X450-G2
Summit X460
Summit X460-G2
Summit X480
Summit X670
Summit X670-G2
Summit X770

If any other Summit switch attempts to join the stack after the initial configuration of PFC, it is not allowed to join.

If your situation does not respond well to having flow control enabled on the fabric links, you can turn off flow control in the fabric by using the following command: