From: kym blair (kymblair@xxxxxxxxxxx)
Date: Sun May 26 2002 - 19:00:25 GMT-3
Eric,
Although R3, R4, and R5 have x.x.x.x in their bgp tables, only R1 can ping
x.x.x.x. You must get x.x.x.x into R2's ip routing table. This can be done
either by adding x.x.x.x to R1's IGP (via network statement, or redistribute
connected), or you must add a static route to R2.
HTH, Kym
>From: eric ong <ongyongk@yahoo.com>
>Reply-To: eric ong <ongyongk@yahoo.com>
>To: ccielab@groupstudy.com
>Subject: Re: [Urgent] What's this simple BGP qn asking for?
>Date: Sun, 26 May 2002 22:31:09 +0800 (CST)
>
>Sorry, I should have given more info:
>
>x.x.x.x -- R1(AS1) -- R2 --- R3(AS3)
> / \
> (AS2)R4 R5(AS2)
>
>- R2 is non-BGP
>- R1 ebgp peers to R4
>- R3 ebgp peers to R5
>- R4 ibgp peers to R5
>- R1 does 'network x.x.x.x'
>- no sync on all
>- IGP connectivity throughout (except for x.x.x.x)
>
>If x.x.x.x doesn't go into IGP (via network or distribute), all BGP
>routers will have x.x.x.x in their routing tables, but will not be
>able to ping it as R2 (non-BGP) will not know about x.x.x.x.
>
>So my question is: given that the requirement only states to
>advertise x.x.x.x through BGP, must x.x.x.x be pingable from BGP
>routers or from all routers (including non-BGP) or it doesn't have to
>be pingable at all?
>
>
>eric ong
>
>
> --- Oliver Boehmer <oboehmer@cisco.com> wrote: >
> > My guess is to assign the IP address (range) to an interface
> > (loopback?) and advertise it using "network x.x.x.x" via BGP. So
> > you can ping it from BGP routers.. It doesn't say anything about
> > advertising it via IGP..
> >
> > oli
> >
> > At 19:30 26.05.2002 +0800, eric ong wrote:
> > >Qn: On R1, assign and advertise x.x.x.x through BGP.
> > >
> > >x.x.x.x is not being advertised by any other protocols.
> > >
> > >So what is this question asking for?
> > >
> > >Just make x.x.x.x appear in all BGP routers' BGP table, don't care
> > if
> > >it's pingable?
> > >
> > >Or must the whole network (non-BGP routers too) be able to ping
> > >x.x.x.x?
> > >
> > >If it's the latter, can I advertise x.x.x.x through IGP or must I
> > >redistribute BGP into IGP on R1?
>
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