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BGP-MPLS VPN extension for IPv4/IPv6 Hybrid Network

BGP-MPLS VPN extension for IPv4/IPv6 Hybrid Network. Defeng Li 77cronux.leed0621@huawei.com Huawei Technologies. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01. Justification

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BGP-MPLS VPN extension for IPv4/IPv6 Hybrid Network

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  1. BGP-MPLS VPN extension for IPv4/IPv6 Hybrid Network Defeng Li 77cronux.leed0621@huawei.com Huawei Technologies

  2. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Justification • IPv6 can’t take the place of IPv4 in the global network in one night, it must co-exist with IPv4 in a long period, then backbone and sites of inter-provider L3VPN will often be IPv4/IPv6 hybrid. • IPv4/IPv6 Hybrid VPN isn’t addressed elsewhere. • Purpose • Proposes some methods for IPv4/IPv6 hybrid VPN • Open to accommodate other methods in the future version

  3. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Contents • Case 1: Both of VPN Backbone and sites are IPv4/IPv6 Hybrid • Method 1 • Method 2 • Case 2: IPv4 backbone with IPv4/IPv6 hybrid VPN sites • Most Concepts inherited from RFC 2547bis • RD • Route Target • VRF • MP-BGP • …

  4. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Method 1 for Case 1

  5. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Route Distribution (Method 1 for Case 1) • Both IPv4 routes and IPv6 routes are distributed between CE-PE, BGP4+,IS-ISv6 and OSPFv3 can carry IPv4/ IPv6 routes simultaneously. • Every two of PEs and ASBR1 in IPv4 AS establish MP-IBGP based on IPv4; • Every two of PEs and ASBR2 in IPv6 AS establish MP-IBGP based on IPv6; • ASBR1 and ASBR2 establish MP-EBGP based on IPv6; • VPN-IPv4 routes and VPN-IPv6 routes can be piggybacked on the same MP-BGP; • PEs maintain VPN-IPv4 routes and VPN-IPv6 routes in respective VRFs, they are differentiated by the AFI of the routes received.

  6. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Address Requirements (Method 1 for Case 1) • Should support two AFI, 1 for IPv4 and 2 for IPv6, SAFI:128; • Two IPv4 sites communicate with IPv4 address; • Two IPv6 sites communicate with IPv6 address; • One IPv4 site and one IPv6 site communicate with IPv6 address; • IPv4 address A.B.C.D/Mask mapped to 0::A:B:C:D/(96+MASK) IPv6 address if necessary; • PEs and ASBRs should support IPv4/IPv6 dual-stack and maintain both VPN-IPv4 routes and VPN-IPv6 routes; • CEs in IPv4 sites which have relations only to other IPv4 sites can support only IPv4 protocol and maintain IPv4 VPN routes, otherwise CE should support IPv4/IPv6 dual-stack;

  7. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Label Distribution (Method 1 for Case 1) • Inherited from RFC 2547bis in every AS; • MP-EBGP between ASBR1 and ASBR2 distributes the labels, and LSPs in AS1 and AS2 can be sticked ; • Packet Forwarding (Method 1 for Case 1) • Packets between sites-PE are forwarded following the IP protocol of the respective version(IPv4/IPv6) • In the backbone packets can be forwarded on the sticked LSP

  8. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Method 2 for Case 1

  9. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Address Requirements (Method 2 for Case 1) • Same with Method 1; • Route Distribution (Method 2 for Case 1) • Every two of PEs in DAS establish MP-IBGP based on IPv4; • Every two of PEs and ASBR2 in PAS establish MP-IBGP based on IPv6; • Every PE in DAS and ASBR2 establish multi-hop MP-EBGP based on IPv4; • VPN routes need to be distributed to sites connected to neighboring AS are distributed by such multi-hop MP-EBGP; • Same with method 1 in other aspects.

  10. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Case 2: IPv4 backbone and IPv4/IPv6 hybrid VPN sites

  11. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Characteristics of Case 2 • Needs no VPN-IPv6 AFI in the backbone; • PE assigns private IPv4 addresses for IPv6 site, and supports private IPv4 address NAT-PT; • Extend MP-BGP protocol by adding an Extended Community attribute: If-V6-Site to identify IPv6 sites; • IPv6 routes are mapped to IPv4 NAT-PT prefix at PE and true IPv6 routes are distributed across backbone as the “value” of If-V6-Site attribute of IPv4 NAT-PT prefix through MP-BGP;

  12. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Characteristics of Case 2 • PE maintains IPv4 routes, IPv6 mapped NAT-PT IPv4 routes and true IPv6 routes; • Communication between IPv4 site and IPv6 site needs NAT-PT translation; • Communication between two IPv6 sites use true IPv6 routes at PE; • Different routes are selected at Ingress PE according to IPv4/IPv6 types of Source/Destination sites when forwarding.

  13. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 • Judgement of IPv4/IPv6 sites • Whether the sites is IPv6 can be identified by the address of the interface between CE and PE, then PE can set the related fields in If-V6-Site attribute when distributing the VPN routes across backbone, and whether the remote site is IPv6 can be identified by If-V6-Site attribute attached to VPN routes received. • If-V6-Site (TLV) Extended Community Attribute 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- |T| length | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+-+-+-+| | IPv6 Route1… | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | IPv6 Routen… | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

  14. draft-defeng-l3vpn-ipv4-ipv6-hybrid-01 What’s Next ? • Can it be accepted as the baseline of wg draft? • Accommodate more mechanism to this draft to address IPv4/IPv6 hybrid VPN.

  15. Thank You!

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