11-28-2006 06:55 AM - edited 03-03-2019 02:50 PM
Currently have BGP set up at our NOC through two upstream peers, for 4 Class C networks. We want to split off a /26 to a remote site, using a third, different ISP for client use. What's the best way to advertise the route to this new subnet? Just advertise the new route through our current BGP speaker, or? Thanks.
11-28-2006 07:30 AM
Your biggest issue is that most ISP's will not accept /26. Even if they do their upstream BGP neighbors will more than likely filter to /24.
If this was for example a /22 and a /24 all you would do is have your new third isp advertise the network and continue to advertise the summaries into your other 2 isp's since the more specific route will be preferred all will work.
This same theory works with the /26 but it will be a matter if all the ISP's involved allow it. It might if the third ISP is a customer of both your current ISP and they configure things to make it work.
11-28-2006 07:49 AM
I agree with Tim.
I had a similar requirement wherein i had to advertise /27 subnets, but these were rejected by my ISP.
The least which can be advertised is a /24 subnet.
HTH
Narayan
11-28-2006 07:59 AM
Thanks to both, I thought the same issue might arise... Would you think a PIX-PIX VPN tunnel between here and there, thus putting both routers in the same space would be a viable option? At our end is 45Mbs Fiber, there is 10 Mbs Copper-Fiber. Thanks again.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide