Alcatel-Lucent 7450 ESS Series Configuration Manual page 56

BFD Over LAG and VSM Interfaces
A second application for a central BFD implementation is so BFD can be supported over LAG or
VSM interface. This is useful where BFD is not used for link failure detection but instead for node
failure detection. In this application, the BFD session can run between the IP interfaces associated
with the LAG or VSM interface, but there is only one session between the two nodes. There is no
requirement for the message flow to across a certain link, or VSM, to get to the remote node.
IES
Note:
In this case BFD is run between the
IES interfaces independent
of the LAG or its members
Page 56
LAG i/f
2
BFD
Figure 11: BFD over LAG
BFD
L2 Switch
2
4
BFD
LAG i/f
IES
7450 ESS OS Router Configuration Guide
IES
LAG i/f
Fig_32A