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If the active IRF fabric fails before the failure is recovered, enable the inactive IRF fabric to take over
the active IRF fabric. Then, recover the MAD failure.

MAD mechanisms

IRF provides MAD mechanisms by extending LACP and BFD.
IMPORTANT:
Do not configure BFD MAD with LACP MAD, because they handle collisions differently.
Table 1
compares the MAD mechanisms and their application scenarios.
Table 1 Comparison of MAD mechanisms
MAD
mechanism

LACP MAD

BFD MAD
LACP MAD
As shown in
Every IRF member must have a link with an intermediate device.
All the links form a dynamic link aggregation group.
The intermediate device must be an HP device that supports extended LACP for MAD.
Advantages
Detection speed is fast.
Does not require
MAD-dedicated physical
links or Layer 3 interfaces.
Detection speed is fast.
No intermediate device is
required.
Intermediate device, if used,
can come from any vendor.
Figure
6, LACP MAD has the following requirements:
Disadvantages
Requires an intermediate
device that supports
extended LACP for MAD.
Requires MAD dedicated
physical links and Layer 3
interfaces, which cannot
be used for transmitting
user traffic.
If no intermediate device
is used, the IRF members
must be fully meshed.
If an intermediate device
is used, every IRF
member must connect to
the intermediate device.
10
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.
No special
requirements for
network scenarios.
If no intermediate
device is used, this
mechanism is only
suitable for IRF fabrics
that have a small
number of members
that are
geographically close
to one another.
For information about
BFD, see High
Availability
Configuration Guide.

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