Setting The Irf Link Down Report Delay; Configuring Mad - HP FlexFabric 12500 Series Configuration Manual

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 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

The following MAD mechanisms are available for detecting multi-active collisions in different network
scenarios:
• LACP MAD
BFD MAD
•
ARP MAD
•
ND MAD
•
LACP MAD handles collisions differently than BFD MAD, ARP MAD, and ND MAD. To avoid conflicts, do
not enable LACP MAD together with any of these mechanisms in an IRF fabric. However, you can use
BFD MAD with ARP MAD or ND MAD.
Table 2 provides a reference for you to make a MAD mechanism selection decision.
Table 2 A comparison of the MAD mechanisms
MAD
mechanism
LACP MAD
Command
system-view
irf link-delay interval
Advantages
•
Detection speed is fast.
•
Requires no MAD-dedicated
physical ports or interfaces.
Remarks
N/A
The default IRF link down report delay is 0
seconds.
Recommended value range is 200 to 500
milliseconds. The greater the interval, the
slower the service recovery.
Disadvantages
Requires an intermediate HP
device that supports
extended LACP for MAD.
30
Application scenario
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.