11
Figure 9 ARP MAD scenario
ND MAD
ND MAD detects multi-active collisions by using NS packets to transmit the IRF domain ID and the
active ID.
You can set up ND MAD links between neighbor IRF member devices, or between each IRF member
device and an intermediate device (see
). If an intermediate device is used, you must also
run the spanning tree protocol between the IRF fabric and the intermediate device.
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.
Device
Master
Subordinate
IRF
fabric
Internet
Customer
premise
network
IRF link
Common traffic path
Extended ARP traffic path
STP domain (all devices
must run the spanning
tree feature)
