Mpls ldp session not forming

S97 and S57 have direct route.

please try S97 and S57 configure the follow command to form ldp session.  and configure the connected interface mpls ldp.

[PE1] mpls lsr-id 1.1.1.9 

[PE1] mpls 

[PE1-mpls] quit 

[PE1] mpls ldp 

[PE1-mpls-ldp] quit 

[PE1] interface gigabitethernet 3/0/0 

[PE1-GigabitEthernet3/0/0] mpls 

[PE1-GigabitEthernet3/0/0] mpls ldp 

[PE1-GigabitEthernet3/0/0] quit

the same configure command in S97 and S57. and check use command "display mpls ldp session"