Figure 11: Bfd Over Lag - Alcatel-Lucent 7450 Configuration Manual

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Bi-directional Forwarding Detection

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.

In this case BFD is run between the

IES interfaces independent

of the LAG or its members

Figure 11: BFD over LAG

7450 ESS Router Configuration Guide