R3303-HP HSR6800 Routers IRF Configuration Guide

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Setting the IRF link down report delay
You can avoid 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 thus 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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Set the IRF link down report
delay.
irf link-delay interval
The default IRF link down report delay is 0
milliseconds.
Recommended value range is 200 to 2000
milliseconds. The greater the interval, the
slower the service recovery.
Configuring MAD
The following MAD mechanisms are available for detecting multi-active collisions in different network
scenarios:
• LACP MAD
• BFD MAD
• ARP MAD
These MAD mechanisms operate independently. You can configure all of them for an IRF fabric.
Table 1 pr
ovides a reference for you to make a MAD mechanism selection decision.
Table 1 A comparison of the MAD mechanisms
MAD
mechanism
Advantages Disadvantages Application scenario
LACP MAD
• Detection speed is fast.
• Requires no MAD-dedicated
physical ports or interfaces.
Requires an intermediate HP
device that supports LACP
MAD packets.
Link aggregation is used
between the IRF fabric
and its upstream or
downstream device.
For information about
LACP, see Layer 2—LAN
Switching Configuration
Guide.