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25-Routing-OSPF-1-Introduction - OSPF Introduction The IETF...

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1 2005/03/11 (C) Herbert Haas OSPF Introduction The IETF Routing Master Part 1
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2 Dijkstra probably hates me Linus Torvalds in kernel/sched.c
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3 3 (C) Herbert Haas 2005/03/11 "Open Shortest Path First" ° Official (IETF) successor of RIP ± RIP is slow ± RIP is unreliable ± RIP produces too much routing traffic ± RIP only allows 15 hop routes ° OSPF is a link-state routing protocol ± Inherently fast convergence ± Designed for large networks ± Designed to be reliable Yes, RIP is bad Voodoo... OSPF was developed by IETF to replace RIP. In general link-state routing protocols have some advantages over distance vector, like faster convergence, support for lager networks. Some other features of OSPF include the usage of areas, which makes possible a hierarchical network topologies classless behavior,there are no such a problem like in RIP with discontiguous subnets. OSPF also supports VLSM and authentication.
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4 4 (C) Herbert Haas 2005/03/11 OSPF Background ° OSPF is the IGP recommended by the IETF ° "Open" means "not proprietary" ° Dijkstra's Shortest Path First algorithm is used to find the best path ° OSPF's father: John Moy ± Version 1: RFC 1131 ± Version 2: RFC 2328 (244 pages !!!) ± And a lot of additional OSPF related RFCs available... The Internet Engineering Task Force (IETF) strictly recommends to use OSPF for Interior Gateway routing (i. e. within an AS) instead of RIP or other protocols. Integrated IS-IS is an alternative routing protocol but not explicitly recommended by the IETF. Note that IS-IS has been standardized by the ISO world. Both (Integrated) IS-IS and OSPF use Dijkstra's famous Shortest Path First (SPF) algorithm to determine all best paths for a given topology.
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