BGP next-hop-self

Discussion in 'Cisco' started by COM3, Jan 4, 2009.

  1. COM3

    COM3 Guest

    Hi

    I hava a question about BGP next-hop-self.
    There is a topology below.

    R1------------R2--------------R3
    (AS100) (AS100) (AS200)
    30.1.1.1 30.2.2.2 30.3.3.3

    R1 and R2 have AS100 ,
    R3 has AS200.
    R1,R2 and R3 interfaces are set in OSPF.
    30.1.1.1 30.2.2.2 30.3.3.3 are not in OSPF,
    but those are advertised from R3 in BGP.

    R1 can see 30.1.1.1 30.2.2.2 30.3.3.3 in BGP
    but R1 cannot ping those.

    next,
    "neighbor R1 next-hop-self" is set on R2,
    R1 can ping those.

    I think that next-hop-self is no need since R1 can see those routes.

    Please anyone can say the advise if i mistake something about it.

    Thanks.
    COM3, Jan 4, 2009
    #1
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  2. COM3

    John Agosta Guest

    "COM3" <> wrote in message
    news:...
    > Hi
    >
    > I hava a question about BGP next-hop-self.
    > There is a topology below.
    >
    > R1------------R2--------------R3
    > (AS100) (AS100) (AS200)
    > 30.1.1.1 30.2.2.2 30.3.3.3
    >
    > R1 and R2 have AS100 ,
    > R3 has AS200.
    > R1,R2 and R3 interfaces are set in OSPF.
    > 30.1.1.1 30.2.2.2 30.3.3.3 are not in OSPF,
    > but those are advertised from R3 in BGP.
    >
    > R1 can see 30.1.1.1 30.2.2.2 30.3.3.3 in BGP
    > but R1 cannot ping those.
    >
    > next,
    > "neighbor R1 next-hop-self" is set on R2,
    > R1 can ping those.
    >
    > I think that next-hop-self is no need since R1 can see those routes.
    >
    > Please anyone can say the advise if i mistake something about it.
    >
    > Thanks.




    1) R1 needs a valid route to the next-hop-address,
    and
    2) because 30.1.1.1, 30.2.2.2, and 30.3.3.3
    are not in R1's OSPF, R1 requires the command "no synch" under bgp.
    John Agosta, Jan 5, 2009
    #2
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