[c-nsp] AToM

[M K]

Hi allI am using GNS3 to simulate some AToM scenarios My topology is R1 -- R2 -- R3 -- R4 -- R5Where R1 and R5 are my CE routersWhen i am using fastethernet all over the network everything is working normally and i established OSPF between the CEs without issuesnow , i changed the connection between R1 and R2 to Serial and between R4 and R5 to POSNow the issue is when i configure the xconnect command on R2 , R1's s1/0 becomes up downR1#sh int s1/0 | inc lineSerial1/0 is up, line protocol is down I changed both encapsulations (PPP and HDLC) without solvingThe same is happening on POS interface (MTU 4470)R5#sh int pos1/0 | inc linePOS1/0 is up, line protocol is down

R2#sh run int s1/0Building configuration...
Current configuration : 138 bytes!interface Serial1/0 no ip address serial restart-delay 0 clock rate 64000 xconnect 4.4.4.4 15 encapsulation mpls pw-class MSSKend
R4#sh run int pos2/0Building configuration...
Current configuration : 93 bytes!interface POS2/0 no ip address xconnect 2.2.2.2 15 encapsulation mpls pw-class MSSKend
Eventhough the LDP peering between R2 and R4 is up
R4#sh mpls ldp neighbor     Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 4.4.4.4:0        TCP connection: 3.3.3.3.646 - 4.4.4.4.23983        State: Oper; Msgs sent/rcvd: 1328/1328; Downstream        Up time: 19:16:51        LDP discovery sources:          FastEthernet1/0, Src IP addr: 192.1.34.3        Addresses bound to peer LDP Ident:          3.3.3.3         192.1.23.3      192.1.34.3          Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 4.4.4.4:0        TCP connection: 2.2.2.2.646 - 4.4.4.4.52161        State: Oper; Msgs sent/rcvd: 22/23; Downstream        Up time: 00:11:58        LDP discovery sources:          Targeted Hello 4.4.4.4 -> 2.2.2.2, active, passive        Addresses bound to peer LDP Ident:          2.2.2.2         192.1.23.2  Any ideas?
Thanks