[c-nsp] Sporadic loss of LDP neighbor ...

Vitkovsky, Adam avitkovsky at emea.att.com
Tue Dec 13 04:48:18 EST 2011

In this case I'd be careful with these features 
Even though the advantage is that you won't loose the label mappings from the particular neighbor in case the direct link fails as the ldp hellos would be exchanged between the loopbacks and can be routed around the failed link same as the tcp session would 
But in this particular case this can mask the underlying issues that have not yet been identified
7200 definitely supports both of these commands 


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pshem Kowalczyk
Sent: Monday, December 12, 2011 9:37 PM
To: Garry
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Sporadic loss of LDP neighbor ...


On 13 December 2011 06:52, Garry <gkg at gmx.de> wrote:
> On 12.12.2011 09:16, Robert Raszuk wrote:
>> Garry,
>> Do you see the same with "mpls ldp targeted-sessions" enabled (even for
>> normal LDP p2p peers) ? At least this is something I would try first ...
> Neither the 7200s nor the ASR support this command ...

I'm not sure if those commands are supported (and have no access to
7200 or ASR1k right now to verify), but try this:

mpls ldp neighbor targeted
(use the loopback address of the peer, this works for individual peers)


mpls ldp session protection

(this enables targeted hellos for all ldp neighbours - it has to be
enabled on both peers)

To see if it's working use show mpls ldp nei detail, you should see
something like this:

Peer LDP Ident:; Local LDP Ident
        TCP connection: -
        State: Oper; Msgs sent/rcvd: 53/51; Downstream; Last TIB rev sent 74
        Up time: 00:11:32; UID: 1; Peer Id 0;
        LDP discovery sources:
          Targeted Hello ->, active, passive;
<----- this is the targeted session
            holdtime: infinite, hello interval: 10000 ms
        Addresses bound to peer LDP Ident:

        Peer holdtime: 180000 ms; KA interval: 60000 ms; Peer state: estab
        Clients: Dir Adj Client
        LDP Session Protection enabled, state: Protecting
            duration: infinite

the active,passive means that the router is both sending and accepting
targeted hellos.

kind regards
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