Re: Duel ISP BGP question

Zack is spot on here.

Send an email to the carrier to get the current list of communties supported
and/or call to see what they will do for or with you. It makes things go a
lot smoother instead of trying to figure out what they do. :-)

Paul

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
www.micronicstraining.com
> From: Zack Tennant <ccie_at_tnan.net>
> Reply-To: Zack Tennant <ccie_at_tnan.net>
> Date: Tue, 5 Oct 2010 11:38:33 -0400
> To: Fake Name <fname84_at_gmail.com>
> Cc: Carlos G Mendioroz <tron_at_huapi.ba.ar>, Cisco certification
> <ccielab_at_groupstudy.com>
> Subject: 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
>>>> 
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>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> --
>>> Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
>> 
>> 
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>> 
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> 
> 
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