Re: BGP multihoming issue

It sounds to me that you are not the one advertising this,
but your ISP1 is being very proactive and doing that for you.

By using a looking glass and doing some change like prepending
while both your links are up, you can ensure that the publishing
is being made in fact by you, or else ask ISP1 to let alone
your /23.

-Carlos

jack daniels @ 6/12/2009 2:55 -0300 dixit:
> Hi guys,
>
> I have a scenario where customer connects to 2 diffrent ISP. Customer has
> taken a block of IP ADDRESS from APNIC ( lets says 1.1.0.0/23)
>
> Now via ISP1 I advertise 1.1.0.0/24 and 1.1.1.0/23<<<<<<Primary for
> 1.1.0.0/24 and secondary for 1.1.1.0/24
>
> Now via ISP2 I advertise 1.1.1.0/24 and 1.1.1.0/23<<<<<<Primary for
> 1.1.1.0/24 and secondary for 1.1.0.0/24
>
> ISSUE - when I shut down the link of ISP1 then my 1.1.1.0/24 works but MY
> 1.1.0.0/24 SUBNET IS NOT GOING THROUGH ISP.
> WHEN I CALLED ISP2 they say we see 1.1.0.0/23 VIA ISP1 STILL.
> <<<<<<<<<<POINT 1
>
>
> when we no shut the link to ISP1 then ISP2 say THEY RECIVE 1.1.0.0/23 FROM
> customer connected to ISP2.<<<<<<POINT 2
>
>
> Can some one help me with this issue or if some one has seen this issue in
> past ,,,,, why ISP2 is still recieving route from ISP1 when customer LINK to
> ISP1 is shutdown and
> why we are not preffering route for 1.1.0.0/23 from customer conneted to
> ISP2/
>
> Regards
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net