LDP must be enabled in order for the protocol to be active. MPLS does not need to be enabled on the router except if the network interface uses the Packet over Sonet (POS) encapsulation (Sonet path encapsulation type set to ppp-auto). In this case, MPLS must be enabled and the interface name added into MPLS to allow for the MPLSCP to come up on the PPP link between the two peers and for MPLS to be used on the interface. MPLS is enabled in the config>router>mpls context.
Use the following syntax to enable LDP on a router:
ldp
config>router# ldp
The following displays the enabled LDP configuration.
A:ALA-1>config>router# info
----------------------------------------------
...
#------------------------------------------
echo "LDP Configuration"
#------------------------------------------
ldp
session-parameters
exit
interface-parameters
exit
targeted-session
exit
exit
----------------------------------------------
...
A:ALA-1>config>router#