BGP multihoming issue

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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Received on Sun Dec 06 2009 - 11:25:07 ART