From: Danny Cox (dandermanuk@gmail.com)
Date: Sat Oct 29 2005 - 10:11:39 GMT-3
Thanks Leigh
that makes sense and is more or less what I understood. Taking your
example, this would still mean that R1 would show as paths from R2 as
'2 3 i' I think .. agreed?
cheers
Danny
On 29/10/05, Leigh Harrison <ccileigh@gmail.com> wrote:
> Danny,
>
> Use local-as prepend when you are lying to a neighbour about you AS
> number, but don't want to pass that number to anyone.
>
> i.e:
>
> R1 -- bgp1-2 -- r2 -- ibgp3-3 -- r3
>
>
> R1 peers with r2 using AS1 to AS2
> R2 is actually running in AS3 and peers with r3 using ibgp
>
> If you just put the normal neighbour statement on r2 to r1, then they
> will not form a relationship, as they disagree on AS numbers. If you
> put in the "neighbor 1.2.3.4 local-as 2" command, then they will form
> the adjacency.
>
> When any routes from R1 appear in the table of R3, they will have an AS
> path of " 1 2 i "
>
> Putting the command "neighbor 1.2.3.4 local-as 2 no-prepend" in will
> ensure that r3 will only have an AS path of " 1 i "
>
> LH
>
> Danny Cox wrote:
>
> >I've had an interesting time reading about local-as. The solutions to
> >a lab I'm doing indicate that 'local-as 60 no-prepend' should be
> >configured on one of the routers, R6. R6 is in AS 600.
> >
> >My reading of what 'local-as no-prepend' does, is that it will make
> >sure that 60 (not 600) is not prepended to routes learned *by* R6 from
> >its ebgp peers. It doesn't stop 600 being prepended to routes learned
> >from R6 by its peers.
> >
> >Anyone agree with me here?
> >
> >Many thanks!
> >
> >Danny
> >
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