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Forum Replies

  1. Hi Diego,

    Good question. Technically it is possible to configure this without OSPF, you'd have to advertise the 192.168.24.0/24 and 192.168.34.0/24 networks on router Jack in BGP so that Jim and John can reach each other.

    It is a best practice so use an IGP to advertise the prefixes within the autonomous system so that's why I used OSPF. It's also a best practice to use loopback interfaces for IBGP (for failover) but that doesn't apply to this topology since there are no backup links within AS2.

    Rene

  2. You can use community strings to set local preference on remote EBGP peers

  3. Hi Rene,

    I always get confused with the in and out direction. Would you please explain more about the when i should use direction in and when i should use out?

    Thank you in advance.

  4. Hi Helen,

    It really depends on what you are trying to change, first of all, keep in mind that inbound/outbound is from the router's perspective.

    Local preference is something we change for OUR autonomous system so we have to apply it to prefixes that we receive. This means we'll have to do it inbound.

    AS Path prepending is something we want to do when we send it to a neighbor, so it has to be outbound. The same for MED...it is advertised to a neighbor.

    Rene

  5. yes, I kind of have the same question. Why do we have to use a protocol like OSPF on top of BGP? faster convergence ? looking for more of a real world kinda answer please

    thank you

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