9
Figure 6 LACP MAD scenario
BFD MAD
BFD MAD can work with or without intermediate devices.
scenario that uses an intermediate device.
shows a typical BFD MAD scenario that does not
use an intermediate device.
To use BFD MAD:
•
Set up dedicated BFD MAD link between each pair of IRF members or between each IRF
member and the intermediate device. Do not use the BFD MAD links for any other purposes.
•
Assign the ports connected by BFD MAD links to the same VLAN.
On the intermediate device (if any), you must also create the VLAN and assign the ports on the
BFD MAD links to the VLAN.
•
Create a VLAN interface for the VLAN, and assign a MAD IP address to each member on the
VLAN interface.
NOTE:
The MAD addresses identify the member devices and must belong to the same subnet.
As a best practice, use an intermediate device to connect IRF member devices if the IRF fabric
has more than two member devices. A full mesh of IRF members might cause broadcast loops.
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
.
Intermediate device
Master
Subordinate
IRF fabric
Internet
Customer
premise
network
IRF link
Common traffic path
LACP MAD traffic path
LACP-enabled dynamic
link aggregation
LACP-enabled dynamic
link aggregation
