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Asked by kbws1 in Network Routers, Network Design & Methodology, Network Operations
Good day.
I have just setup multi-homing on my network for Internet redundancy using BGP on a Cisco 3745 router. My primary ISP (ISP1) provides a class C netblock that I use. ISP2 is my backup, I receive IP's from them but am not concerned about them as far as redudnancy. I have established default route BGP sessions with each ISP and annouced ISP1's netblock over both. I have done the proper route-maps to restrict annoucement of my isp1 netblock to allow only that netblock to be annouced over each ISP. I have added a route-map to prepend my ASN 2 extra times on the ISP2 connection so that it is less preferrable when the ISP1 route is available. I also have a local pref statement in BGP for ISP 1 so my router likes it better as well
To test I have used several BGP looking glass sites to see the BGP tables to reflect my annoucements. My concern is that they drastically differ. Some only see anoucement from ISP1, a few only see ISP2 annoucement. Most see multiple instances of ISP1's annoucement, a few see both. The ones that see both, some prefer ISP1 others prefer ISP2 because of a shorter AS Path. I imagine I can fix that by increasing my prepend statement to make the AS path longer.
My concern is that is it normal to have such variation across the Internet? I have not actually caused a failure on my network to actually test the redundancy as I'd like to have a better feeling on the configuration is proper before I actually down the ISP1 port.
Thank you!
20091111-EE-VQP-92 / EE_QW_2_20070628
