Inter-AS L3VPN Connectivity Options

Option A : Back-2-Back VRF connectivity

CE2 > (destination IP address) > PE2 > (PE-ASBR2 LDP/TE label | VPN Label L2 | Destination IP address)> PE-ASBR2 > (Destination IP address) > PE-ASBR1 > (PE1 LDP/TE label | VPN Label L1 | Destination address) > PE1 > (Desination IP address ) > CE1

Option B : BP-eBGP via directly connected ASBRs

CE2 > (destination IP address) > PE2 > (PE-ASBR2 LDP/TE label | VPN Label L3 | Destination IP address)> PE-ASBR2 > (VPN Label 2 | Destination IP address) > PE-ASBR1 (PE1 LDP/TE label | VPN Label L1 | Destination IP address) > PE1 > (destination IP address) > CE1

Option C : BP-eBPG via Multi-Hop MP-eBGP between non-directly connected ASBRs

CE2 > (destination IP address) > PE2 > (PE-ASBR2 LDP/TE label | VPN Lable L3 | Destination IP address)> PE-ASBR2 > (PE-ASBE1 LDP/TE label | VPN Label L2 | Desination IP address) > PE-ASBR1 > (PE1 LDP/TE label | VPN Label L1 | Destination IP adress) > PE1 > (destination IP address) > CE1