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FAQ: What Are Differences Between the LDP Adjacency and LDP Peer?

Publication Date:  2013-09-03 Views:  42 Downloads:  0
Issue Description

What are differences between the LDP adjacency and LDP peer?

Handling Process

N/A

Root Cause

N/A

Solution

For standard meanings of the LDP adjacency and LDP peer, see the RFC 3036. In this case, the two concepts are explained as follows:
      adj1 --------------------------adj1
RTA    adj2---------------------------adj2    RTB
           adj3---------------------------adj3 
In this networking, two routers, RTA and RTB, are connected through three links and LDP is configured on each port.
1. Two routers with an established LDP session are called LDP peers. The link connecting the two routers is called an adjacency.
2. Two routers can have multiple links between them. That is, two peers can have multiple adjacencies between them.
3. A link connects only to two routers. That is, one adjacency matches two peers.
RTA has three links connected to RTB, so RTB has three adjacencies. The three links connected only to one router RTB, so RTA has only one peer. After you run the display mpls ldp peer command on RTA, the following command output is displayed:
         LDP Peer Information in Public network
 ------------------------------------------------------------------------------
 Peer-ID                Transport-Address          Discovery-Source
 ------------------------------------------------------------------------------
 RTB:0                  1.1.1.1                            GigabitEthernet0/0/0
                                                                    GigabitEthernet2/0/0
                                                                    GigabitEthernet3/0/0
 ------------------------------------------------------------------------------

END