HP FlexFabric 12500 Series Configuration Manual page 17

Figure 10 ND MAD application scenario
Each IRF member device compares the domain ID and the active ID in incoming NS packets with its
domain ID and active ID:
If the domain IDs are different, the NS packet is from a different IRF fabric. 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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