LDP TARGET SESSION

[Ratheesh mv]

I have read about MPLS targeted LDP session and MPLS LDP session protect. As per my understanding both the features are doing same thing .May I know the exact difference between them and the situation where can I use these features ?

Thanks in advance.  

[loris.marcellini]

Hey there, I am sure you can find a much better answer online on the Cisco
website but in essence:

A targeted session is just a session between non-adjacent devices. The
session protect is a mechanism by which a session is maintained up for a
while even when the actual control plane experiences disruption, this
allows the data plane traffic to be switched based on the last known labels
exchanged across the LDP session that is having problems.

[Harold Ritter · Accepted solution]

Hi Ratheesh,

Targeted LDP sessions are used to exchange labels between two peers that are generally not directly connected. It can be to exchange service labels (L2VPN), IGP labels (LDP overs MPLS TE tunnels) or LDP path protection.

LDP session protection uses targeted LDP session, but it is a different features. LDP session protection uses a LDP targeted session to exchange labels with a peer over a backup path that is not directly connected. This way if the directly connected path to the peer goes down, labels are already available over the non-directly connected backup path, which accelerates the convergence.

Regards,