Setting The Irf Link Down Report Delay; Configuring Mad - HP FlexFabric 5700 series Configuration Manual

Setting the IRF link down report delay

To prevent frequent IRF splits and merges during link flapping, configure the IRF ports to delay reporting
link down events.
An IRF port does not report a link down event to the IRF fabric immediately after its link changes from up
to down. If the IRF link state is still down when the delay is reached, the port reports the change to the IRF
fabric.
IRF ports do not delay link up events. They report the link up event immediately after the IRF link comes
up.
When you configure the IRF link down report delay, follow these restrictions and guidelines:
• Make sure the IRF link down report delay is shorter than the heartbeat or hello timeout settings of
upper-layer protocols (for example, CFD and FCoE). If the report delay is longer than the timeout
setting of a protocol, unnecessary recalculations might occur.
Set the delay to 0 seconds in the following situations:
•
The IRF fabric requires a fast master/subordinate or IRF link switchover.
The GR feature is used.
You want to shut down an IRF physical interface or reboot an IRF member device. (After you
complete the operation, reconfigure the delay depending on the network condition.)
To set the IRF link down report delay:
Step
1. Enter system view.
2. Set the IRF link down
report delay.

Configuring MAD

When you configure MAD, follow these restrictions and guidelines:
You can configure ARP MAD and ND MAD together in an IRF fabric for prompt IRF split detection.
•
However, do not configure any of these mechanisms together with LACP MAD, because they
handle collisions differently.
• If LACP MAD, ARP MAD, or ND MAD runs between two IRF fabrics, assign each fabric a unique
IRF domain ID.
An IRF fabric has only one IRF domain ID. You can change the IRF domain ID by using the following
•
commands: irf domain, mad enable, mad arp enable, or mad nd enable. The IRF domain IDs
configured by using these commands overwrite each other.
To prevent a port from being shut down when the IRF fabric transits to the Recovery state, use the
•
mad exclude interface command. To bring up ports in a Recovery-state IRF fabric, use the mad
restore command instead of the undo shutdown command. The mad restore command activates
the Recovery-state IRF fabric.
Command
system-view
irf link-delay interval
23
Remarks
N/A
The default IRF link down report delay is 4
seconds.