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OSPF Protocol Extension

OSPF Protocol Extension. Acee Lindem/Cisco Systems. OSPF Extension Chronology. RFC 1247, RFC 1583, RFC 2178, and RFC 2328 – Evolution of base OSPFv2 protocol Area Hierarchy with full link state topology within an area 5 Basic LSA Types 32 bit aligned fields

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OSPF Protocol Extension

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  1. OSPF Protocol Extension Acee Lindem/Cisco Systems OSPF WG – IETF 62

  2. OSPF Extension Chronology • RFC 1247, RFC 1583, RFC 2178, and RFC 2328 – Evolution of base OSPFv2 protocol • Area Hierarchy with full link state topology within an area • 5 Basic LSA Types • 32 bit aligned fields • RFC 1584 - MOSPF adds Multicast trees and Type 6 LSAs • RFC 1583 Adds NSSAs and Type 7 LSAs OSPF WG – IETF 62

  3. OSPF Extension Chronology • RFC 2370 – Adds Opaque LSAs with flooding scope built into types. Backward compatible introduction of new LSAs. • RFC 2740 – OSPFv3 • Generalized flooding of unknown LSAs • LSID no longer denotes route prefix • Separation of intra-area topology and prefix information • RFC 3623 – OSPFv2 Graceful Restart – Uses link scoped opaque LSA. • RFC 3630 – OSPFv2 Traffic Engineering Uses area scoped LSAs • OSPFv2 MTR – Reuses TOS routing metrics OSPF WG – IETF 62

  4. Future OSPF Expansion Options • Option #1 – Continue adding new LSA types for OSPFv3 and new opaque types for OSPFv2. • Option #2 – Go to TLV based approach with everything in one or two advertisements (ala ISIS). • Option #3 – Evolve to TLV based approach based on existing LSA types – draft-mirtorabi-mt-ospfv3-01.txt OSPF WG – IETF 62

  5. Options #1 Advantages • Advertisements contain only what changes – although this is already skewing with OSPFv2 MTR. • Potentially smaller LSAs • Maintains status quo – we don’t change the way we are moving. OSPF WG – IETF 62

  6. Option #3 Advantages • No synchronization issues between LSAs. Fewer lookups and less searching • Flexible extension while still maintaining reasonable LSA granularity • Fewer LSAs to manage – Less header overhead • Unified approach for protocol extension • Most important :^) – Other IGPs will no longer be able to say we’re inflexible OSPF WG – IETF 62

  7. OSPF WG Vision – Single IP IGP Enterprise/ISP/Wireless Networks OSPFv3 MANET Multi-AF/MTR TLV Extensions OSPFv3 Base OSPF WG – IETF 62

  8. Given Option #3 – Questions?? • What about OSPFv2 in the near future? • Could extend like OSPFv2 using opaque LSAs and TLVs and gain the same benefits • Trade-off of requirements versus duplication of effort • How do we avoid protocol bloat? OSPF WG – IETF 62

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