BGP MULTIHOMING

Unanswered Question
Feb 10th, 2012
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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

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rooland12 Sat, 02/11/2012 - 11:31
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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.

jgraafmans Sat, 02/11/2012 - 12:10
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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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