i know that LSP without vpn MPLS , is performed like that : CUST1 (10.10.10.1) ---PE1 ----P ------P ----PE2 ----- CUST2 (188.8.131.52) PE2 assigned a label (L1) to FEC 184.108.40.206 and sent at P this last receive (L1) and swap it to P with (L2) and the same thing for PE1. the P in this case without vpn MPLS know the CEF 220.127.116.11 in LFIB table because it assigned label at 18.104.22.168 my problem is that in MPLS VPN the P not known CEF 22.214.171.124 (VRF A + label VPN) therefore how LSP is established in step when PE2 add 2 label ,one for VPN and second label for which FEC ? it is 126.96.36.199 if yes the 188.8.131.52 is not known in RIB please some one explain me step to performed LSP in above case. i have the same for 6PE (LSP for P )
For MPLS VPN network, usually all PEs know how to get to other PE routers via LSP tunnels. These are transport/outer tunnels/labels.
Over the transport tunnel, PE2 advertises to PE1 via BGP, to use a label L for 184.108.40.206. This L is inner label that is put on the packet leaving PE1, then PE1 also puts an outer/transport label on the packet as it exists out. All intermediate P routers just look at the transport/outer label to guide the packet all the way to PE2. PE2 knows what inner label is and guides the packet to correct interface for 220.127.116.11.
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