You can enable LDP-IGP synchronization on an interface that belongs to an OSPF process and override global LDP-IGP synchronization.

1. Enable LDP-IGP synchronization with OSPF on the interface.

   vyatta@R1# set protocols mpls-ldp discovery interfaces interface dp0p1s1 igp-synchronization-delay <delay>

2. Verify LDP-IGP synchronization with OSPF on the interface.

   vyatta@vyatta:~$ show ip ospf interface dp0p1s1
   dp0p1s1 is up, line protocol is up
     Internet Address 192.166.2.1/30, Area 0.0.0.0, MTU 1500
     Process ID 0, routing-instance (default), Router ID 1.1.1.1, Network Type BROADCAST, Cost: 10
     Transmit Delay is 1 sec,  State DR, Priority 1, TE Metric 10
     LDP-OSPF Sync configured 
       Holddown timer not configured
     Designated Router (ID) 1.1.1.1, Interface Address 192.166.2.1
     Backup Designated Router (ID) 3.3.3.3, Interface Address 192.166.2.2
     Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
       Hello due in 00:00:05
     Neighbor Count is 1, Adjacent neighbor count is 1
     Hello received 197 sent 205, DD received 3 sent 4
     LS-Req received 1 sent 1, LS-Upd received 71 sent 32
     LS-Ack received 9 sent 37, Discarded 0
     No authentication

3. Verify LDP-IGP synchronization with LDP.

   vyatta@vyatta:~$ show mpls ldp igp sync
   lo is up, line protocol is up
     LDP not configured; LDP-IGP Synchronization not enabled.
   dp0s4 is up, line protocol is up
     LDP not configured; LDP-IGP Synchronization not enabled.
   dp0p1s1 is up, line protocol is up
     LDP configured; LDP-IGP Synchronization enabled.
     Session IP Address : 3.3.3.3
       Sync status: Achieved
       Delay timer: Configured, 15 seconds, Not Running
   dp0p1s2 is up, line protocol is up
     LDP not configured; LDP-IGP Synchronization not enabled.
   dp0p1s3 is up, line protocol is up
     LDP configured; LDP-IGP Synchronization enabled.
     Session IP Address : 2.2.2.2
       Sync status: Achieved
       Delay timer: Configured, 15 seconds, Not Running
   dp0p1s4 is up, line protocol is up
     LDP not configured; LDP-IGP Synchronization not enabled.
   lo1 is up, line protocol is up
     LDP not configured; LDP-IGP Synchronization not enabled.