R211x-HP Flexfabric 11900 IRF Command Reference
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In an MDC environment, the irf domain command is available only on the default MDC, but the mad
enable command is available on all MDCs. If you change the IRF domain ID in one MDC, the IRF
domain IDs in all other MDCs change automatically.
Examples
# Set the IRF domain ID to 30.
<Sysname> system-view
[Sysname] irf domain 30
irf link-delay
Use irf link-delay to set a delay for the IRF ports to report a link down event.
Use undo irf link-delay to restore the default.
Syntax
irf link-delay interval
undo irf link-delay
Default
The IRF link down event report delay is 4000 milliseconds (4 seconds).
Views
System view
Predefined user roles
network-admin
mdc-admin
Parameters
interval: Sets the IRF link down report delay in the range of 0 to 10000 milliseconds. If the interval is set
to 0, link down events are reported without any delay.
Usage guidelines
This command is available in IRF mode. Changing the operating mode from IRF to standalone can cause
loss of the irf link-delay command configuration even if you have saved the configuration.
Link flapping causes frequent IRF splits and merges during a short time. You can avoid this situation by
configuring the IRF ports to delay reporting link down events.
An IRF port handles link down and link up events as follows:
• When the IRF link changes from up to down, the port does not immediately report the change to the
IRF fabric. If the IRF link state is still down when the delay time is reached, the port reports the
change to the IRF fabric.
• When the IRF link changes from down to up, the link layer immediately reports the event to the IRF
fabric.
HP recommends setting the delay to 0 seconds in one of the following situations:
• The IRF fabric requires a quick master/subordinate or IRF link switchover.
• The BFD or GR feature is used.
If the CFD feature is used in the IRF fabric, make sure the delay interval is shorter than the maximum CCM
lifetime. For more information about CFD, see High Availability Configuration Guide.