--> By default MPLS Transport Address is nothing but LDP Router ID.
--> MPLS enabled router sends transport address in hello message.
--> If other Router dont have the path to reach transport address then the LDP Neighbor relationship won't form.
--> If the path to reach transport address is not the same interface on which LDP hello message is received then also LDP neighbor relationship won't form.
--> To check the LSR router id and Transport address use following command.
# sh mpls ldp discovery detail
--> We can change the transport address either by changing the router-id or by manual.
i) By changing LDP router-id changing the transport address
Router(config)# mpls ldp router-id loo1 force
ii) By Manually Changing the transport address
Router(config)# int loo1
Router(config-if)# mpls ldp discovery transport-address interface
--> MPLS enabled router sends transport address in hello message.
--> If other Router dont have the path to reach transport address then the LDP Neighbor relationship won't form.
--> If the path to reach transport address is not the same interface on which LDP hello message is received then also LDP neighbor relationship won't form.
--> To check the LSR router id and Transport address use following command.
# sh mpls ldp discovery detail
--> We can change the transport address either by changing the router-id or by manual.
i) By changing LDP router-id changing the transport address
Router(config)# mpls ldp router-id loo1 force
ii) By Manually Changing the transport address
Router(config)# int loo1
Router(config-if)# mpls ldp discovery transport-address interface
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