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Inter-AS Option B between NVO3 and BGP/MPLS IP VPN network draft-hao-l3vpn-inter-nvo3-vpn-00

Inter-AS Option B between NVO3 and BGP/MPLS IP VPN network draft-hao-l3vpn-inter-nvo3-vpn-00. Weiguo Hao ( Huawei ) L ucy Yong ( Huawei ) S usan Hares ( Huawei ). haoweiguo@huawei.com lucy.yong @huawei.com shares@ndzh.com. July, 2014 Toronto Canada. Scenario. CE1. CE2. CE3. CE4.

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Inter-AS Option B between NVO3 and BGP/MPLS IP VPN network draft-hao-l3vpn-inter-nvo3-vpn-00

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  1. Inter-AS Option B between NVO3 and BGP/MPLS IP VPN networkdraft-hao-l3vpn-inter-nvo3-vpn-00 WeiguoHao(Huawei) Lucy Yong(Huawei) Susan Hares(Huawei) haoweiguo@huawei.com lucy.yong@huawei.com shares@ndzh.com July, 2014 Toronto Canada Inter-as NVO3 and MPLS/IP VPN

  2. Scenario CE1 CE2 CE3 CE4 PE1 PE2 MPLS/IP VPN Network Inter-as connection should be setup between ASBRs. Two solutions: Option-A Option-B. ASBR2 WAN Network AS2 AS1 Data center Network ASBR1 NVO3 Network NVE1 NVE2 Green VPN Purple VPN TS1 TS2 TS3 TS4 Inter-as NVO3 and MPLS/IP VPN

  3. Option-A solution Option-A inter-as solution issues: Huge number of sub-interfaces and EBGP session need to exist between ASBRs. CE1 CE2 CE3 CE4 PE1 PE2 MPLS/IP VPN Network ASBR2 Sub-interfaces are used for VPN traffic separation. ASBR1 NVO3 Network NVE1 NVE2 TS1 TS2 TS3 TS4 Inter-as NVO3 and MPLS/IP VPN

  4. Option-B solution：outgoing direction CE1 CE2 CE3 CE4 PE1 PE2 MPLS/IP VPN Network MPLS VPN Label 3000 MPLS VPN Label 4000 ASBR2 MPLS VPN Label 3000 MPLS VPN Label 4000 packet ASBR1 VN ID is allocated per MPLS VPN Label. NVO3 Network NVE1 NVE2 Outgoing forwarding table TS1 TS2 TS3 TS4 Inter-as NVO3 and MPLS/IP VPN

  5. Option-B solution：incoming direction CE1 CE2 CE3 CE4 PE1 PE2 MPLS/IP VPN Network ASBR2 packet MPLS VPN Label is allocated per VN per NVE ASBR1 NVO3 Network Incoming forwarding table NVE1 NVE2 VN 20 VN 10 TS1 TS2 TS3 TS4 Inter-as NVO3 and MPLS/IP VPN

  6. Vanilla Option-B solution characteristics • No VRF exists on ASBR • No sub-interface associated with each VRF exists between ASBRs • No EBGP session associated with each VRF exists between ASBRs • Only VN ID and MPLS Label switching on ASBR Inter-as NVO3 and MPLS/IP VPN

  7. Comments from Robert • ASBR for some VPNs can be just pure vanillaoption B and for those which have a lot of prefixes can be enhanced with per VRF aggregation function. Robert's solution can reduce routing fluctuations in NVO3 network . In WAN to DC direction , VPN option-B connection terminates on ASBR-1 in Robert’s solution. In this draft, VPN option-B connection extends to local NVE in data center. • Define few modes of VN_ID allocations on ASBR1. • The above points will be adopted in next version. Inter-as NVO3 and MPLS/IP VPN

  8. Next Steps • Solicit other comments and suggestions. Inter-as NVO3 and MPLS/IP VPN

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