After long vacation, I continue with l2vpn series. In this post I would like to share about the disconnection of label switch path but xconnect session never terminates. The sesion establish because of ip reachability not of ldp. So if the ldp is broken anywhere in the path , it won’t terminates the xconnect connection but the main problem is hpw to troubleshoot. The troubleshooting of the same is very easy with the help of ping mpls pseudosire . If the path is mpls enabled you would definately receive the ping acknowledgement else it will be dropped.