R3303-HP HSR6800 Routers IRF Configuration Guide

8
• If the extended LACPDUs convey the same domain ID but different active IDs, a split has occurred.
To handle this situation, LACP MAD sets the IRF fabric with higher active ID in Recovery state, and
shuts down all its physical ports except for the console ports, IRF ports, and any ports you have
specified with the mad exclude interface command. The IRF fabric with lower active ID is still in
Detect state and forwards traffic.
Figure 6 LACP MAD application scenario
BFD MAD
BFD MAD can work with or without intermediate devices. Figure 7 shows a typical BFD MAD application
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.
The MAD addresses identify the member devices and must belong to the same subnet.
With BFD MAD, the master tries to establish BFD sessions with the other member devices by using its
MAD IP address as the source IP address:
• If the IRF fabric is integrated, only the MAD IP address of the master is effective, and the master
cannot establish a BFD session with any other member. If you execute the display bfd session
command, the state of the BFD sessions is Down.