BGP inbound route filtering

[Danilo Dy]

How can I filter inbound traffic from specific ISP's. I have two upstream ISP (ISP1 and ISP2), can I prepend my AS to some AS behind ISP2 but not all AS behind ISP2?

There is one AS behind ISP2 that I want it to choose ISP1 path to my AS, I want it to filter by not affecting other AS. How to do it?

Any other BGP filtering for manipulating incoming traffic beside prepending?

Thanks in advance.

[cjousten · Accepted solution]

Hi,

I'm afraid there is no way to achieve this.

You will need to either talk to ISP2 or to the administrator of the AS behind the ISP2.

Regards,

Chris

[Danilo Dy]

I think so also. Just checking if someone have made a tweaking or workaround to do that (but I think that's impossible).

Hope in the future BGP in Cisco can do it. It will give more flexibility (and money).

Thanks.

[ruwhite]

You might be able by adding a community to the route that tells the ISP to do the as path prepend on certain borders, or not advertise a route along certain border. Talk to your ISP and see if they have filters of this type, based on communities, configured on their routers.

Russ.W