HPE FlexFabric 5700 Series Configuration Manual page 14

Figure 6 shows a typical BFD MAD scenario that uses an intermediate device.
typical BFD MAD scenario that does not use an intermediate device.
With BFD MAD, the master attempts to establish BFD sessions with other member devices by using
its MAD IP address as the source IP address.
•
If the IRF fabric is integrated, only the MAD IP address of the master takes effect. The master
cannot establish a BFD session with any other member. If you execute the display bfd
session command, the state of the BFD sessions is Down.
•
When the IRF fabric splits, the IP addresses of the masters in the split IRF fabrics take effect.
The masters can establish a BFD session. If you execute the display bfd session command,
the state of the BFD session between the two devices is Up.
Figure 6 BFD MAD scenario with an intermediate device
BFD MAD link
192.168.1.2/24
Master
Figure 7 BFD MAD scenario without an intermediate device
Master
ARP MAD
ARP MAD detects multi-active collisions by using extended ARP packets that convey the IRF
domain ID and the active ID.
You can use common or management Ethernet ports for ARP MAD.
•
If management Ethernet ports are used, ARP MAD must work with an intermediate device.
Make sure the following requirements are met:
Connect the management Ethernet port on each member device to the intermediate device.

On the intermediate device, you must assign the ports used for ARP MAD to the same

VLAN.
•
If common Ethernet ports are used, ARP MAD can work with or without an intermediate device.
Make sure the following requirements are met:
If an intermediate device is used, connect each IRF member device to the intermediate

device. Run the spanning tree feature between the IRF fabric and the intermediate device.
In this situation, data links can be used.
If an intermediate device is not used, connect each IRF member device to all other member

devices. In this situation, IRF links cannot be used for ARP MAD.
Device
IRF fabric
IRF link
IRF fabric
BFD MAD link
VLAN 2
192.168.1.2/24
IRF link
BFD MAD link
192.168.1.3/24
Subordinate
VLAN 2
192.168.1.3/24
Subordinate
10
Figure 7 shows a