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New Member

Question on BGP best path routing.

Basically we are some content provider hosted through our website and these service is hosted in the 2 data center Site A and B. We have client 

worldwide. Currently we are going through a network restructuring and we have registered our ASN number (100) and our own ip block of /22 in this diagram. Question is that knowing all the client we had ,can we provide a best routing path for our client to connect to our service using BGP AS_path configuration in our router?  Such that user in ISP C will be directed to Site A rather than site B in this case. Or rather this routing is done via ISP level?





Cisco Employee

Hello, Could you clarify the



Could you clarify the below.

- What are routes advertised from Site A and Site B?

- Why the traffic frim ISP C is going towards the Site A.

- Are you advertising only /22 from both the sites?


If you are advertising same /22 route from both the sites, a better solution would by make subnets of /22 and distribute it between two sites. Then advertise the individual subnets from the sites.

This would optamize the traffic.



New Member

Sorry for not being clear

Sorry for not being clear enough.

-We are running IBGP through VPN to both site

-ISP C and ISP A is in the same country

-yup both site /22 currently.


I am going to break it to /23 and advertise on both site.


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