Re: Duel ISP BGP question

Yes they could be. It could be they have a policy for no prepending
allowed, or they might have a maximum prepend length. You need to contact
them and ask them.

Are you using a public AS, or are they doing an AS re-write? If they are
re-writing; they probably don't allow prepending at all, this way.

Have you checked what communities they permit and if you can prepend that
way?

On Tue, Oct 5, 2010 at 11:25, Fake Name <fname84_at_gmail.com> wrote:

> I did the command below on both routers after
>
> Clear ip bgp * on both routers. Odd....is it possible the IS is stripping
> off my as prepend I think my configuration is correct no?
>
>
>
>
> On Tue, Oct 5, 2010 at 11:14 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar
> >wrote:
>
> > 2 or 3 minutes ?
> > Have you forced your new pollicy by doing a clear soft out ?
> >
> > Fake Name @ 5/10/2010 11:56 -0300 dixit:
> >
> >> I have two ISP's and two routers running BGP between them peering to my
> >> AS.
> >>
> >> Both routers peer with ISP routers and have an IBGP relationship between
> >> them.
> >>
> >> I put the following config into one router asuming my as is 1
> >>
> >> route-map aspend permit 30
> >> set as-path prepend 1 1 1 1 1 1 1 1
> >>
> >> router bgp 1
> >> neighbor x.x.x.x.remote-as 2
> >> neighborx.x.x.x. route-map aspend out
> >>
> >> This should append the as 1 and make it less perfered for traffic to
> come
> >> into the link via the best path algorithm when making the decision which
> >> route to choose from other AS's. We did this configuration and an hour
> >> later on the internet we where unable to see our as prepends from any of
> >> the
> >> looking glasses. How long in the real world will this update take to
> >> propergate via the looking glasses?
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Tue Oct 05 2010 - 11:38:33 ART