BGP query
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01-21-2007 06:00 AM - edited 03-03-2019 03:26 PM
Hello,
I hv two ISP connection. ISP1 peering has done on one router for 3 of my networks(x.x.x.x). ISP2 peering has done for one network (y.y.y.y) on another router.HSRP is running between these two routers. I am advertising all my 4 networks via both router (ISP 1 and ISP2)But the problem i'm facing is that i'm receiving advertisement via my 2nd ISP and not via ISP1.
I want to rx x.x.x.x n/w via ISP 1 and y.y.y.y via ISP2. But both n/w (i.e x.x.x.x and y.y.y.y) is rxed by ISP 2.
I hv done the prepending of ISP2 network block in ISP1 router and ISP1 network block in ISP2 router.
Please find the attached ISP 1 and ISP 2 router configuration.
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Routing Protocols
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01-21-2007 06:14 AM
Hi there,
Lets agree on a couple of facts, using perpending has nothing to do with receiving advertisements from you ISPs, its all about filtering (using destribute-list, prefix-list or route-map), accordingly i can't understand the use of "neighbor x.x.x.x distribute-list 40 in" ?
regards,
Mohammed Mahmoud.
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01-21-2007 07:31 AM
Hi!!!,
Ya i know that.I want x.x.x.x n/w to be available via ISP 1 and same x.x.x.x n/w to rx via ISP 2 but as a backup path and y.y.y.y n/w to be be rx from ISP 2 as primary and y.y.y.y n/w to be rx from ISP 1 as backup.With Distribute list we can either filter the ip network block.
In my case i want to rxe all ip blocks and not to block and ip blocks.i.e i want x.x.x.x/24 to rx via ISP 1 as primary and x.x.x.x/24 to rx via ISP 2 as backup when primary fails.same way for y.y.y.y/24 ip network block.
Please do let me know ur reply.
Waiting for ur reply.
Regards,
Yash
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01-21-2007 07:32 AM
Hi!!!,
Ya i know that.I want x.x.x.x n/w to be available via ISP 1 and same x.x.x.x n/w to rx via ISP 2 but as a backup path and y.y.y.y n/w to be be rx from ISP 2 as primary and y.y.y.y n/w to be rx from ISP 1 as backup.With Distribute list we can either filter the ip network block.
In my case i want to rxe all ip blocks and not to block and ip blocks.i.e i want x.x.x.x/24 to rx via ISP 1 as primary and x.x.x.x/24 to rx via ISP 2 as backup when primary fails.same way for y.y.y.y/24 ip network block.
Please do let me know ur reply.
Waiting for ur reply.
Regards,
Yash
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01-21-2007 07:32 AM
Hi!!!,
Ya i know that.I want x.x.x.x n/w to be available via ISP 1 and same x.x.x.x n/w to rx via ISP 2 but as a backup path and y.y.y.y n/w to be be rx from ISP 2 as primary and y.y.y.y n/w to be rx from ISP 1 as backup.With Distribute list we can either filter the ip network block.
In my case i want to rxe all ip blocks and not to block and ip blocks.i.e i want x.x.x.x/24 to rx via ISP 1 as primary and x.x.x.x/24 to rx via ISP 2 as backup when primary fails.same way for y.y.y.y/24 ip network block.
Please do let me know ur reply.
Waiting for ur reply.
Regards,
Yash
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01-21-2007 09:24 AM
Hi there,
Ok i got you now, your prepending configuration seems ok, look what you're gonna do now is contact your 2 providers to make sure that they receive your routes with the correct prepending as this can't be checked from your local routers.
regards,
Mohammed Mahmoud.
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01-21-2007 10:06 AM
Ok fine thanks for ur suggestion
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01-21-2007 08:30 PM
Hi Yash,
Check with ISP1 whether they are doing route Aggregation/summarization and if the AS path information are being advertised intact by them to their upstream.
thanks and regards
Ashish
