51cto下载-ccnp学习中ospf的精华部分（51CTO download the essence of OSPF in -ccnp learning）.docVIP

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51cto下载-ccnp学习中ospf的精华部分（51CTO download the essence of OSPF in -ccnp learning）.doc

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51cto下载-ccnp学习中ospf的精华部分（51CTO download the essence of OSPF in -ccnp learning）

51cto下载-ccnp学习中ospf的精华部分（51CTO download the essence of OSPF in -ccnp learning） OSPF is a necklace road state technology, such as routing information protocol (RIP) that distance vector relative technology. The OSPF protocol to complete all two functions of routing protocol algorithm: exchange and path. OSPF is an interior gateway protocol (IGP), which means that it belongs to the same in the release of routing information between routers of autonomous systems. OSPF is to solve RIP can not solve the large, scalable network needs to write the OSPF to solve the following problems: The convergence rate of 1 2 of the variable length subnet mask (VLSM) support 3 OSPF, RIPV2 support VLSM, RIP only supports FLSM (FLSM) 4 network accessibility The 5 RIP span of the 16 jump is not reachable, no accessibility limit OSPF theory 6 bandwidth 7 RIP every 30 seconds to broadcast a complete routing, OSPF only changes to update the link 8 path selection method 9 RIP is based on the number of hops to choose the best path, OSPF uses a path cost (cost value for the Cisco router which is based on the connection rate) as the basis for the choice of path. 10 OSPF and RIP, IGRP as straight to the overhead of path 11 OSPF information in IP data packet, protocol No. 89 OSPF can run in the broadcast network or non broadcast network, OSPF run Hello protocol topology in access is responsible for establishing and maintaining the neighbor relationship in broadcast multiaccess, through IP multicast group broadcast , also known as ALLSPFROUTER (all SPF the router address, Hello) packets are periodically sent from each interface in OSPF). One of the essential parts of CCNP learning OSPF: contained in Hello data packet information as follows: Router ID The 32 bit digital within an autonomous system only identifies a router. It is the default active interface the highest IP address. The logo is very important in building neighborhood and municipalities directly under the central government run copies o