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Multi-AS tunnel LSP model AS 1 AS 2 AC 3 AC 6 ASBR-1 ASBR-2 PE-1 PE-2 PE-3 PE-4 pseudo-wire Tunnel LSP LDP AC 1 AC 4 Attachment circuit Attachment circuit Auto-discovery (MP-iBGP) Auto-discovery (MP-iBGP) Auto-discovery (MP-eBGP) PE-PE LSP is built as per RFC 2547, option (c) Addresses of PEs + labels carried in BGP PW signaling from PE-PE |