HP 12500 SERIES Configuration Manual page 16

Figure 9 ARP MAD application scenario
Each IRF member compares the domain ID and the active ID in incoming extended ARP packets
with its domain ID and active ID:
If the domain IDs are different, the extended ARP packet is from a different IRF fabric, and the
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device does not continue to process the packet with the MAD mechanism.
If the domain IDs are the same, the device compares the active IDs:
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If the active IDs are different, the IRF fabric has split.
If the active IDs are the same, the IRF fabric is integrated.
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