Ecmp Considerations - Alcatel-Lucent 7210 SAS M User Manual

Label Distribution Protocol
As soon as the last Hello adjacency goes down due to BFD timing out, the LDP session goes down
and the LDP FRR procedures will be triggered. This will result in moving the traffic to an LFA
backup next-hop on a different LDP peer.

ECMP Considerations

Whenever the SPF computation determined there is more than one primary next-hop for a prefix, it
will not program any LFA next-hop in RTM. Thus, the LDP FEC will resolve to the multiple
primary next-hops in this case which provides the required protection.
Also note that when the system ECMP value is set to ecmp=1 or to no ecmp, which translates to
the same and is the default value, SPF will be able to use the overflow ECMP links as LFA next-
hops in these two cases.
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7210 SAS M, T, X, R6, Mxp MPLS Configu-