HPE FlexFabric 12900E Series Configuration Manual page 16

NOTE:
• The MAD addresses identify the member devices and must belong to the same subnet.
• Of all management Ethernet ports on an IRF fabric, only the master's management Ethernet port
is accessible.
Figure 10 shows a typical BFD MAD scenario that uses an intermediate device. On the intermediate
device, assign the ports on the BFD MAD links to the same VLAN.
Figure 11 shows a 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
session
•
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
command, the state of the BFD session between the two devices is Up.
Figure 10 BFD MAD scenario with an intermediate device
BFD MAD link
192.168.1.2/24
Master
Figure 11 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 a 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.
command, the state of the BFD sessions is Down.
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
12
display bfd
display bfd session