02-10-2012 10:43 AM - edited 03-04-2019 03:13 PM
Helo everyone,
I need help in setting up the routing policy for multihoming. The scenario is we have 1 router connected to ISPA and ISPB. For few destinations I have given higher weight attribute so that it exit through ISPA and few other destinations through ISPB(higher weight attribute) .
How can I make sure that the reverse route is same as the forward path. For example: For Destination1 packet is exiting through ISPA ,then how to make sure that return traffic comes through ISPA only but not through ISPB.
I hope you understand the scenario
Regards,
Rooland
02-11-2012 11:01 AM
Any input would be helpful....
02-11-2012 11:19 AM
You can use AS path-prepending to advertise a longer AS path to one provider and/or BGP communities to influence the local preference on the provider site.
See http://blog.ioshints.info/2008/02/bgp-essentials-as-path-prepending.html for more information about both options and the configuration of the AS-path prepend option.
Regards
Jasper
02-11-2012 11:31 AM
Hi Jasper,
Thanks for the response...
But I think I can use AS path-prepaending/BGP comunities only in ACTIVE/STANDBY connection style.
In my scenario, both ISP's are active .
My requirement is that traffice going out of ISP A should return through ISP A, vice versa traffice going out throught ISP B should return through ISP B.
02-11-2012 12:10 PM
Routing is uni-directional so this is not possible because you cannot influence the way the returning traffic flows based on the source addres of that returning traffic.
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