Configuring Mad - HP 5130 EI series Configuration Manual

Step
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 those mechanisms in an IRF fabric. However, you can use
BFD MAD, ARP MAD, and ND MAD together.
Table 1 compares the MAD mechanisms and their application scenarios.
Table 1 Comparison of MAD mechanisms
MAD
mechanism
LACP MAD
BFD MAD
Command
irf link-delay interval
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.
Remarks
The default IRF link down report delay is 4
seconds.
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, any two IRF
members must have a
BFD MAD link to each
other.
•
If an intermediate device
is used, every IRF
member must have a BFD
MAD link to the
intermediate device.
26
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.