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Forum Replies

  1. Rene,

    I noticed in the frame-relay “eigrp on Multipoint Frame-Relay” you did not do the ping back to R3.
    So, when I tried it failed of course. I created in GNS3 a loopback on R3 and advertised it on
    EIGRP and it would not ping from router 2(R2). You then have to correct the problem by mapping the DLCI on
    router 3, as well. If you do not add the static DLCI mapping to the interface s0/0 on R3 the entire router
    is not able to be pinged from R2 to R3. Checking the Routing table shows an EIGRP route (R2) through R1 but
    R3 will not respond to the echo reque

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  2. @Forrest That’s right, in that example I only solved the problem for the ping from R3 to R2 by adding a frame-relay map on R2. For the other way around, you should add a map on R3 as well.

    The underlying problem here is that EIGRP expects the network to be multi-access, this means that all devices should be able to reach each other directly. In reality, only the hub can reach the spokes directly. You won’t be able to estalish an EIGRP adjacency between R2/R3 directly with only PVCs to the hub.

    It’s better to use frame-relay point-to-point everywhere instead. Yo

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  3. Hi,

    My question is if we have to configure also the spoke routers with the same type of logical sub-interface that we use in the hub? In other examples, and I used it as well on GNS3, I configured my hub router with logical sub-interfaces (point-to-point)/(multi-point) but for the spoke routers I always used the physical interface regardless the setup on the hub router. Is this approach correct ? Thus my configuration on the spokes was always done with the "frame-relay map ip ", which I take into account both for the hub router and rest of spokes. Thus I use

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  4. Hello Konstantinos!

    The spoke routers can be configured to function using a subinterface or using the physical interface for both point to point configurations (each link between routers has its own subnet) or point to multipoint configurations (all routers are in the same subnet). It is a good idea however to use subinterfaces because the numbers used for the subinterface can correspond to the DLCIs of the PVC. It is also a more symmetric configuration having both ends configured in the same way. The functionality will be the same however.

    I hope this has been helpful!


  5. Hello Oliver

    When configuring subinterfaces to function with Frame Relay, it is necessary to first configure the main physical interface with frame relay encapsulation. There is no need to configure an IP address as each subinterface will have its own IP address.

    I hope this has been helpful!


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