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Service providers frequently interconnect multiple autonomous systems and require seamless L3VPN service continuity across AS boundaries. We verified SR-MPLS interworking across two ASs following RFC 4364 Inter-AS Option C. We established end-to-end MP-BGP VPN reachability between two PEs, while the ASBRs in between were used to provide labeled transport across the AS boundary by means of BGP Labeled Unicast (BGP-LU). As the table below shows, we executed multiple role combinations, rotating PE and ASBR roles to test the end-to-end service. The L3VPN service exchange remained on the PE-to-PE MP-BGP control plane, while the ASBRs provided labeled transport across the AS boundary. To validate data plane forwarding, we connected traffic generators to both PEs and generated bidirectional PE-to-PE traffic across the inter-AS SR-MPLS network. Traffic forwarded successfully end-to-end in both directions with zero packet loss, confirming correct VPN reachability and correct inter-AS labeled transport using BGP-LU under the Option C model. Each AS operated its own IGP domain running IS-IS as the SR-MPLS control plane. |
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[[~[~[Figure 65: SR-MPLS Inter AS~>~>image:485164879113551873_SRMPLS-05-INTERAS-Generic-1-v1.png~|~|alt="Figure 65" width="550"~]~]>>attach:485164879113551873_SRMPLS-05-INTERAS-Generic-1-v1.png||target="_blank"]] |
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|=**Combination**|=**PE1**|=**ASBR1**|=**ASBR2**|=**PE2** |
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|1|Ericsson RAN Connect 6682|Ribbon NPT-2507|Raisecom RAX721-T-4C24|Raisecom iTN8800-A |
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|2|Ribbon NPT-2507|ZTE ZXCTN 6120H-E|Raisecom RAX721-T-4C25|ZTE ZXR10 M6000-2S16 |
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|3|Ribbon NPT-2507|Ericsson RAN Connect 6682|Raisecom RAX721-T-4C26|Raisecom iTN8800-A |
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Table 35: Combinations |
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|[[< Previous>>doc:Topology Independent Loop Free Alternative over SRMPLS]]|[[Next ~>>>doc:SR-MPLS - SRTE Traffic Steering (per destination)]] |
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