[nsp] how to force specific subnet out specific interface

Stephen J. Wilcox steve at telecomplete.co.uk
Tue Feb 17 05:52:02 EST 2004

Well, you can do policy routing so build a route map to match the ips and set 
next hop to isp2 then apply the policy to the other interfaces on the router (to 
catch packets as they come in)

But I'm not sure why you need to do this, is isp1 filtering you? you should be 
able to send packets sourced from your new subnet out via isp1 and receive the 
retujrn packets back via isp2 without issue.. if they are filtering perhaps you 
can persuade them to modify their filters even if they dont wish to accept your 
bgp prefix.


On Mon, 16 Feb 2004, Chris Hale wrote:

> All -
> I need to force a specific subnet out a specific interface.  All other 
> traffic I want to balance using BGP between two transit providers.
> My issue is that ISP#1 is forcing me to register with a routing registry 
> before they'll let me announce any of my IP space from ISP#2.  I have a 
> customer of ours who needs to get up and running and we were provided 
> new IP space from ISP#2.  Until I get my routing registries done, I want 
> to use the new IP space and use the transit of ISP#2 for this new customer.
> Is this accomplished through some policy routing?  I'm using a PA-FE-TX 
> on a 7206, 12.2(15)T10.  Any reference URLs would be great.
> Thanks,
> Chris

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