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Forum Replies

  1. why would u need to run more than 1 routing protocol in your network. wouldn’t you either run in todays world purely eigrp or ospf? why both?

  2. Hi Ruby,

    If you design a network, you will always use one routing protocol (if possible). Here are some scenarios where you might have to use two routing protocols:

    • You are migrating your company network with the network from another company. Maybe you are running OSPF and they are running EIGRP. As a temporary solution you could use redistribution and run both protocols.
    • You run OSPF on your internal network and are installing a new site. Your SP offers you a MPLS VPN connection but only supports BGP as the routing protocol.
    • You use EIGRP on your network b
    ... Continue reading in our forum

  3. Thanks Laz, it kind of helps by giving me a basic concept.

  4. I would add when it comes to more specific routes, for example a router learns 192.168.1.0/24 from OSPF (AD 110) and 192.168.1.0/25 from RIP (AD 120), the router will choose the more specific route, so the RIP one, despite it has a higher (worse) AD .
    So, if we want to reach the host 192.168.1.1 from this router, it will use the /25 route from RIP.

  5. Hello Juan,

    The key thing to remember is that AD only applies when you have two exact routes.

    192.168.1.0/24 and 192.168.1.0/25 are not the same routes.

    Rene

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