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OSPFv3 over IPv4 for IPv6 Transition

Explore the benefits of utilizing OSPFv3 over IPv4 as a transition strategy for some networks, reducing costs and complexity while maintaining existing topology. Learn how to optimize the transition process efficiently.

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OSPFv3 over IPv4 for IPv6 Transition

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  1. OSPFv3 over IPv4 for IPv6 Transition draft-chen-ospf-transition-to-ospfv3-01 I. Chen, A. Lindem & R. Atkinson

  2. Existing Approach • Transport OSPFv2 over IPv4 • Use OSPFv2 only for IPv4 • Transport OSPFv3 over IPv6 • Use OSPFv3 only for IPv6 • Manage 2 IGPs at the same time for the same site • This can increase operational complexity. • This also increases operational cost.

  3. Proposal • OSPFv3 over IPv4 is an alternative transition strategy for some sites • Use existing Address Family extension to carry both IPv4 prefixes & IPv6 prefixes in OSPFv3 at the same time • Use IP protocol number 89. • Start with transporting OSPFv3 over IPv4 • To accommodate sites without IPv6. • Transition to transport OSPFv3 over IPV6 • One transport technology is necessary • This lowers operational complexity & cost for some sites

  4. Version 01 Updates • IPv4-only use case • Help some sites transition to IPv6 • Reduce operational costs • General use case • Opportunity to focus future OSPF extensions on OSPFv3

  5. IPv4-only Use Case • Some equipment only supports IPv4 and ARP. • Has fixed filters to allow IPv4-related EtherTypes. • IPv4 Ethertype 0x0800 • ARP Ethertype 0x0806 • Fixed filters drop everything else • Example: IPv6 Ethertype 0x86dd • Some equipment with serial interfaces only supports IPv4-over-PPP, not IPv6-over-PPP. • Example: commonly used VSAT terminals

  6. Virtual Link Transport • Destination address must be a routable address. • OSPFv2 virtual link • IPv4 destination address • IPv4 encapsulation and transport • OSPFv3 virtual link • IPv4 unicast address family • IPv4 destination address • IPv4 encapsulation and transport • IPv6 unicast address family • IPv6 destination address • IPv6 encapsulation and transport

  7. Working Group Adoption?

  8. End of Presentation

  9. OSPFv3 Packet in IPv4 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 4 | IHL |Type of Service| Total Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Identification |Flags| Fragment Offset | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Time to Live | Protocol 89 | Header Checksum | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Destination Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Options | Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 3 | Type | Packet length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Router ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Area ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Checksum | Instance ID | 0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OSPFv3 Body ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ IPv4 Header OSPFv3 Header

  10. Transition to OSPFv3 Establish full adjacency R1:OSPFv3 R2: OSPFv3 20.1.1.1/24 20.1.1.2/24 2001:1::1/64 2001:1::2/64 Retain original OSPFv3 domain/topology

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