HP 5120-24G EI Configuration Manual page 14

Figure 6 ARP MAD application scenario
Each IRF member compares the domain ID and the active ID in incoming extended gratuitous ARP
packets with its domain ID and active ID:
• If the domain IDs are different, the extended gratuitous ARP packet is from a different IRF fabric, and
the 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:
•
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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