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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP and aggregation
RD> Date: Sat, 11 May 2002 17:34:39 -0400 (EDT) RD> From: Ralph Doncaster RD> I have transit in 2 cities. I have a circuit connecting the RD> 2 cities as well. So far I've been using non-contiguous IPs, RD> so there's been no opportunity for aggregation. Having just RD> received my /20 from ARIN, I'm trying to plan my network. RD> Lets say I split the /20 into 2 /21's, one for each city. RD> I'd like to announce the aggregate /20 instead of 2 /21's, as RD> long as the circuit connecting the 2 cities is working. If RD> the circuit goes down I want each city to announce the local RD> /21. Is this possible? (using either a Cisco router or RD> Zebra) * BGP is an EGP, not an IGP * You might want to check out OSPF if you think your net will grow * You don't want your IGP influencing your EGP. Flap, flap. * Redistributing EGP into IGP isn't exactly good, either. Are the upstreams the same in each city? Why not announce the aggregate /20 normally, and set NO_REDISTRIBUTE and use MEDs on the /21s? You're paying for transit, so MEDs are fair game. -- Eddy Brotsman & Dreger, Inc. - EverQuick Internet Division Phone: +1 (316) 794-8922 Wichita/(Inter)national Phone: +1 (785) 865-5885 Lawrence ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Date: Mon, 21 May 2001 11:23:58 +0000 (GMT) From: A Trap <[email protected]> To: [email protected] Subject: Please ignore this portion of my mail signature. These last few lines are a trap for address-harvesting spambots. Do NOT send mail to <[email protected]>, or you are likely to be blocked.
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