Setting The Irf Link Down Report Delay; Configuring Mad - HP 5900 Series Configuration Manual

Setting the IRF link down report delay

You can avoid IRF link flapping causing frequent IRF splits and merges during a short time by configuring
the IRF ports to delay reporting link down events. An IRF port works 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.
To set the IRF link down report delay:
Step
1. Enter system view.
2. Set the IRF link down
report delay.

Configuring MAD

You have the following MAD mechanisms for detecting multi-active collisions in different network
scenarios:
• LACP MAD
BFD MAD
•
• ARP MAD
ND MAD
•
LACP MAD handles collisions in a different way than BFD MAD, ARP MAD, and ND MAD. To avoid
conflicts, do not enable LACP MAD together with any of those mechanisms in an IRF fabric. However,
you can use BFD MAD, ARP MAD, and ND MAD together.
Table 1 provides a reference for you to make a MAD mechanism selection decision.
Command
system-view
irf link-delay interval
23
Remarks
N/A
The default IRF link down report delay is 4
seconds.
The greater the interval, the slower the service
recovery.
If your IRF fabric requires a fast
master/subordinate or IRF link switchover or has
deployed the BFD or GR feature, HP
recommends setting the delay to 0 seconds.
If CFD is enabled in the IRF fabric, the IRF link
down report delay must not exceed the timeout
time of the remote MEP. For more information
about CFD, see High Availability Configuration
Guide.