H3C Technologies H3C S12500 Series Switches - Manual (Page 20)

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Figure 9 BFD MAD application scenario (with an intermediate device)
ARP MAD
ARP MAD detects multi-active collisions by using extended gratuitous ARP packets that convey the IRF
domain ID and the active ID.
You can set up ARP MAD links between neighbor IRF member devices, or between each IRF member
device and an intermediate device (see
Figure 10 ). If an intermediate device is used, you must also run
the spanning tree feature between the IRF fabric and the intermediate device.
Master Subordinate
IRF
Internet
Customer
premise
network
Aggregation group on
Device, used for
forwarding service
packets
Device
Subordinate Subordinate
Intermediate switch
Common Ethernet link
BFD MAD link
IRF link