H3C S9500E Series Configuration Manual page 38

If the domain IDs are the same, the switch 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 operating normally.
Network requirements
2.
Set up ARP MAD links between neighbor IRF member switches, or more commonly, between each IRF
member switch and an intermediate switch (see
enable MSTP on the intermediate switch and the IRF fabric.
CAUTION:
If the intermediate device is in an IRF fabric, you must assign this fabric a different domain ID than the ARP
MAD-enabled fabric to avoid false detection of IRF partition.
Figure 12 Network diagram
Master
Configuring ARP MAD detection
3.
To configure ARP MAD:
To do...
Enter system view
Assign a domain ID to the IRF
fabric
Terminal
network
To avoid loops, all devices
Device
configured with the MSTP
IRF
IRF link
Internet
Transmission path for common service packets
Transmission path for gratuitous ARP packets
Use the command...
system-view
irf domain domain-id
Figure 12). If an intermediate switch is used, you must
STP Domain
in the domain have to be
function.
Slave
30
Remarks
—
Required
By default, the domain ID of an
IRF fabric is 0.