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Forum Replies

  1. Can you shed any light on the default information originate and it's use in BGP.

  2. Hi Rouzbeh,
    1. If no mask is specified, default mask is used, that is /8 in your example.
    2. When Rene said "exact mask has to be added in network command" meant that if we have a prefix in routing table (say 192.168.1.0/25), and we want this prefix to be injected in bgp with network command we should use

    router bgp 1
    network 192.168.1.0 255.255.255.128

    in our config.
    If we are going to use:

    router bgp 1
    network 192.168.1.0

    , router will assume an implicit mask (255.255.255.0).
    So 192.168.1.0/24 prefix will not enter bgp table because we do not have 192.168.1.0/24 in routing table. We have 192.168.1.0/25 but not 192.168.1.0/24.
    Briefly, if we have 192.168.1.0/25 in r. table, we should use EXACT prefix (of course) and mask (!) in network statement
    network 192.168.1.0 255.255.255.128
    Hope it helps.
    A.

  3. Hi,

    How do I advertise public IP to a peer? for example, my server 10.123.10.50 should NAT to <public-IP> and routed to neighbor.

    The router only knows the 10.123.10.0/24 network as connected.

    Best.

  4. Hlw Rene,

    Hope you are doing great ..

    One questions ..

    The BGP router will trigger a routing update to neighbor if belonging subnets are flap again & again in internal domain ?? How could we get routing upadate stability if BGP router always send Update. Could you please explain more on it .Many thanks

    br/
    zaman

  5. HI Rene,
    SInce BGP only advertises network which matches in the routing table, why doesn't it advertise prefixes learnt from other neighbor as its own network to other neighbors .
    the show ip route command does show route is being self-originated but the last update still shows that is prefix is being learnt from neighbor
    Please advise

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