Hello, I am facing a strange problem. I have delpoyed a network using 5 routers
R1 ----> R2 ---> R3 ---->R4 --> R5
R1 is conencted to R2 using POS STM1
R2 is connected to R3 using GigE
R3 us connecred to R4 using GRE Tunnel over internet
R4 is connected to R5 using GigE
i can see all of the network connected with proper ldp neighbours; all of the routers are able to ping and trace eachother and i can see the lables for all of the remotes
when i try pinging MPLS LSP from R2 to R4 using ping mpls ipv4 <targetip/mask> command, it is stopping at R4 and cannot reach R4 and returns f: FEC mismatch
but when i try the same from R2 to R5, it is going through.
#tr mpls ip 10.1.41.2/32
Tracing MPLS Label Switched Path to 10.1.41.2/32, timeout is 2 seconds
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
'L' - labeled output interface, 'B' - unlabeled output interface,
'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
'P' - no rx intf label prot, 'p' - premature termination of LSP,
'R' - transit router, 'I' - unknown upstream index,
'X' - unknown return code, 'x' - return code 0
Type escape sequence to abort.
0 10.31.71.2 MRU 1500 [Labels: 68 Exp: 0]
L 1 10.31.71.1 MRU 1480 [Labels: implicit-null Exp: 0] 232 ms
f 2 10.31.71.1 4 ms
f 3 10.31.71.1 0 ms
f 4 10.31.71.1 4 ms
f 5 10.31.71.1 0 ms
f 6 10.31.71.1 0 ms
#tr mpls ip 10.1.41.1/32
Tracing MPLS Label Switched Path to 10.1.41.1/32, timeout is 2 seconds
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
'L' - labeled output interface, 'B' - unlabeled output interface,
'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
'P' - no rx intf label prot, 'p' - premature termination of LSP,
'R' - transit router, 'I' - unknown upstream index,
'X' - unknown return code, 'x' - return code 0
Type escape sequence to abort.
0 10.31.71.2 MRU 1500 [Labels: 69 Exp: 0]
L 1 10.31.71.1 MRU 1476 [Labels: 126 Exp: 0] 192 ms
I 2 10.1.41.21 MRU 1504 [Labels: implicit-null Exp: 0] 192 ms
! 3 10.1.41.9 188 ms
Can anyone suggest what course of troubleshooting i should opt?
