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The IRF member devices send extended LACPDUs that convey a domain ID and an active ID. The
intermediate device transparently forwards the extended LACPDUs received from one member device to
all the other member devices.
If the domain IDs and active IDs sent by all the member devices are the same, the IRF fabric is
integrated.
If the extended LACPDUs convey the same domain ID but different active IDs, a split has occurred.
LACP MAD handles this situation as described in
Figure 6 LACP MAD scenario
Intermediate device
Master

BFD MAD

BFD MAD can work with or without intermediate devices.
scenario.
To use BFD MAD:
Set up dedicated BFD MAD link between each pair of IRF members or between each IRF member
and the intermediate device. Do not use the BFD MAD links for any other purpose.
Assign the ports connected by BFD MAD links to the same VLAN.
Create a VLAN interface for the VLAN, and assign a MAD IP address to each member on the VLAN
interface.
NOTE:
The MAD IP addresses identify the member devices and must belong to the same subnet.
Customer
premise
network
LACP-enabled dynamic
link aggregation
IRF fabric
IRF link
Internet
Common traffic path
LACP MAD traffic path
"Collision
handling."
LACP-enabled dynamic
link aggregation
Subordinate
Figure 7
shows a typical BFD MAD application
11

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