LDP FRR Procedures
Page 556 7450 ESS MPLS Guide
session goes also down. In this case, LDP sends a neighbor/next-hop down message to the
IOM for this LDP peer only.
5. A BFD session enabled on the LDP interface to a directly connected peer, times-out and
brings down the link LDP session to this peer. In this case, LDP sends a neighbor/next-hop
down message to the IOM for this LDP peer only. BFD support on LDP interfaces is a
new feature introduced for faster tracking of link LDP peers. See Section 1.2.1 for more
details.
The tunnel-down-dump-time option or the label-withdrawal-delay option, when enabled, does not
cause the corresponding timer to be activated for a FEC as long as a backup NHLFE is still
available.
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.
LDP FRR and LDP Shortcut
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