For these reasons, we see that the L2TP IPSec-based VPN environment, the agreement can not be used for network address translation NAT. MP-iBGP protocol based on the MPLS VPN system, there are two levels of routing, ie routing and VPN routing domain. All the PE routers and P router within the backbone to run the route, the routing table generation backbone network will trigger the establishment of LSP, or RSVP by CR-LDP signaling protocol such as establishment of LSP, the label produced for the VPN forwarding outer label switching packet. PE routers run MP-iBGP protocol router across the backbone of the P distribution between the VPN tab in the PE, the formation of VPN routing, MP-iBGP released a VPN routing information contained there: IPv4 addresses, routing specifier, routing target, VPN label and next hop PE address, in which RD IPv4 addresses to eliminate ambiguity in order to reuse the IPv4 address; RT to control the VRF import and export policies to control network connectivity and topology; address of next hop PE is the routing and VPN routing connections within the link, the PE routers in the VRF on the basis of the next hop PE to get the address to find the global routing table to reach the outer layer of the address label should be marked.
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