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Forum Replies

  1. Hi Rene,
    Can you please explain why do neighbors need to be activated ? In the old syntax ( without address families) these was no “activate”. After declaring the neighbors they were activated by default ? But in the new format they are “born” not activated so we need to activate them ?
    Thank you.
    BR
    Adrian

  2. Hi Thomas,

    That’s right. Even though 1+2 are possible, I’d stick to option 3 :slight_smile:

    Rene

  3. BGP by default, only has the IPv4 unicast family activated so you can advertise IPv4 unicast prefixes, that’s it. By enabling other address families, you can advertise things like multicast routes or VPN routes. BGP doesn’t use multicast addresses itself, it will always use a TCP session between two neighbors, that’s it.

  4. diff AS so the route-map to change the NEXTHOP has to be applied outbound not inbound i hv tested it

  5. Hello Brian,

    With MP-BGP, there’s basically two things:

    • The session itself, established through IPv4 or IPv6 and TCP is the transport protocol.
    • The stuff we advertise…different address families: IPv4 unicast, IPv6 unicast, IPv6 unicast, IPv6 multicast, VPN routes, etc.

    It’s best to see the stuff that we advertise as “objects” or something. Once a session is established, you can advertise whatever you want. It’s possible to have an IPv4 neighbor adjacency and advertise IPv6 prefixes or the other way around, an IPv6 neighbor adjacency and advertise IPv4 prefixe

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