Routing protocols

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tmt
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36153
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Routing protocols
Updated:
2010-09-20 21:45:40
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Routing protocols
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Routing protocols
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  1. Routing
    Information Protocol (RIP)
    • RIP is a distance vector routing
    • protocol used for routing within an autonomous system (i.e.an IGP).
    • RIP uses the hop count as the metric.
    • RIP networks are limited in size to a maximum of 15
    • hops between any two networks. A network with a hop count of 16 indicates
    • an unreachable network.
    • RIP v1 is a classful protocol; RIP v2 is a classless
    • protocol.

    RIP is best suited for small private networks.
  • Enhanced
    Interior Gateway Routing Protocol (EIGRP)
    • EIGRP is a hybrid routing protocol
    • developed by Cisco for routing within an AS.



    • EIGRP uses a composite number for the metric that
    • indicates bandwidth and delay for a link. The higher the bandwidth, the
    • lower the metric.
    • EIGRP is a classless protocol.


    • EIGRP is best suited for medium to large private
    • networks.
  • Open Shortest Path First (OSPF)
    OSPF is a link state routing protocol used for routing within an AS.


    • OSPF uses a relative link cost for the metric.
    • OSPF is a classless protocol.
    • OSPF divides a large network into areas.

    • Each autonomous system requires an area 0 that
    • identifies the network backbone.
    • All areas are connected to area 0, either directly
    • or indirectly through another area.
    • Routes between areas must pass through area 0.

    • Internal routers share routes within an area;
    • area border routers share routes between areas; autonomous system
    • boundary routers share routes outside of the AS.
    • A router is the boundary between one area and another
    • area.
    • OSPF is best suited for large private networks.
  • Intermediate System to Intermediate System (IS-IS)
    IS-IS is a link state routing protocol used for routing within an AS.



    • IS-IS uses a relative link cost for the metric.
    • IS-IS is a classless protocol.
    • The original IS-IS protocol was not used for routing IP
    • packets; use Integrated IS-IS to include IP routing support.
    • IS-IS divides a large network into areas. There is no
    • area 0 requirement, and IS-IS provides greater flexibility than OSPF for
    • creating and connecting areas.
    • L1 routers share routes within an area; L2
    • routers share routes between areas; an L1/L2 router can share
    • routes with both L1 and L2 routers.
    • A network link is the boundary between one area and
    • another area.


    • IS-IS is best suited for large private networks,
    • supporting larger networks than OSPF. IS-IS is typically used within an ISP,
    • and easily supports IPv6 routing.
  • Border Gateway Protocol (BGP)
    BGP is an advanced distance vector protocol (also called a path vector protocol). BGP is an exterior gateway protocol (EGP) used for routing between autonomous systems.
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