LDP Neighbors Down

[Ayush Srinet]

Hi All,

Can sone one help on mention log.

by default hello is 5 sec. and hod is 15 sec in LDP(MPLS), and as per my logg, neighbour ship down at 12:08:27 and it came back at 12:08:30, before expire of ded interval, then why neighbour ship goes down.

please help me.

.Mar  9 12:08:27.652 IST: %LDP-5-NBRCHG: LDP Neighbor 202.56.111.137:0 (6) is DOWN (Discovery Hello Hold Timer expired)

.Mar  9 12:08:30.528 IST: %TDP-4-LDP_SESSION_PARAM: Peer 202.56.111.137:0; Interface GigabitEthernet0/2.31; Peer/Local LDP Loop Detection off/on, Path vector Limit = 0/255

.Mar  9 12:08:30.556 IST: %LDP-5-NBRCHG: LDP Neighbor 202.56.111.137:0 (9) is UP

[Fredrik Lönnman]

12:08:27 was when the hold timer expired, so it actually lost communications with the neighbor 15 secs before that.

[Alessio Andreoli]

Hi there,
I hope this output taken from the rfc 3815 Will help you
pathVector(4) -- Loop Detection is supported by
Path Vector only.

hopCountAndPathVector(5) -- Loop Detection is
supported by both Hop Count
And Path Vector.

Since Loop Detection is determined during
Session Initialization, an individual session
may not be running with loop detection. This
object simply gives an indication of whether or not the
LSR has the ability to support Loop Detection and
which types."


RFC 3815 page 9.

I hope this helps

Alessio

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