Configuring the LDP LSR ID
By default, the LSR-ID is the first available loopback interface address. However, you can specify an IP address of your choice to use as the LSR-ID for the LDP identifier.
vyatta@R1# set protocols mpls-ldp lsr-id <ip address>
The following example shows how to configure the LDP router ID as 184.108.40.206.
vyatta@R1# set protocols mpls-ldp lsr-id 220.127.116.11