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6 Cards in this Set

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How does LDP discover neighbours

1. Hello (discovery)


- source: interface IP,


destination: 224.0.0.2 (all routers)


- UDP source 646 destination 646


2. Adjacency


- Source/dest IP: Loopback


- TCP dest 646

What port LDP is using

UDP 646


TCP 646

How does MPLS authentication work?

The TCP session is authenticated (TCP option 19)




(config)# mpls ldp neigh x.x.x.x password abc

How to clear LDP neighbors?

clear mpls ldp neighbor *



What type of PE-CE routing is possible via 6PE?

BGP v6 only

What type of PE-CE routing is possible via 6VPE?

EIGRP...TBC