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Forum Replies

  1. Hi ,
    I did not understand this
    “As soon as router John receives the hello packet from Jack it will respond by sending update packets that contain all the routing information that it has in its routing table. The only routes that are not sent on this interface are the one that John learned on this interface because of split-horizon”

    router will send an UPDATE without forming a neighbor relationship??
    Jack has not shared any update to john, then how john will come to know the prefix of jack so there is no point of split horizon here.
    please correct me if am wrong…

  2. Hi Rene,

    On below config advertisement

    John(config)#router eigrp 1
    John(config-router)#no auto-summary 

    if i add below config on it

    John(config)#router eigrp 1
    John(config-router)#passive-interface loopback 0

    That means traffic for network and won’t pass on interface loop back 0 ?

  3. Hi Taslim,

    There are a couple of parameters that have to match:

    • Authentication
    • AS Number
    • K values
    • Subnet
    You can also take a look at this post where I walk you through the most common issues with the EIGRP neigbor adjacency:

    EIGRP Neighbor Adjacency Troubleshooting


  4. Hi @wisamani,

    If you don’t supply a wildcard then EIGRP will assume you want the whole network to be advertised. Here’s an example:

    Router(config)#router eigrp 1
    Router(config-router)#no auto-summary 

    This is what is stored in the running config:

    Router#show run | begin router eigrp
    router eigrp 1
 falls under the class A range so that’s what EIGRP adds to the running config. If you don’t want this, you have to add a wildcard:

    Router(config)#router eigrp 1
    Router(config-router)#no network
    ... Continue reading in our forum

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