Bfd mad, N in, Figure 7 – H3C Technologies H3C S12500 Series Switches User Manual
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Figure 7 LACP MAD application scenario
BFD MAD
If the IRF fabric has only two member devices, BFD MAD detection can work with or without an
intermediate device. If the IRF fabric has three or four member devices, there must be an intermediate
device.
show two typical BFD MAD application scenarios.
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. Only use the BFD MAD links for BFD MAD.
•
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 IP 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 perform the display bfd session
command, the state of the BFD sessions is Down.
•
When the IRF fabric splits, the IP addresses of the masters in the split IRF fabrics take effect, and the
two masters can establish a BFD session. If you use the display bfd session command, the state of
the BFD session between the two devices is Up.