Date: Sat, 29 May 1999 13:11:31 +0200 From: Andreas Klemm <andreas@klemm.gtn.com> To: freebsd-net@FreeBSD.ORG, zebra@zebra.org, Kunihiro Ishiguro <kunihiro@zebra.org> Subject: Re: OSPF eequal-cost paths, which algorithm, how exactly load balancing ? Message-ID: <19990529131131.A8802@titan.klemm.gtn.com> In-Reply-To: <19990528084002.A41138@titan.klemm.gtn.com>; from Andreas Klemm on Fri, May 28, 1999 at 08:40:02AM %2B0200 References: <19990528084002.A41138@titan.klemm.gtn.com>
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Hi, thanks for the many people answering. I learned the following: a) turning off the fast cache on a Cisco Router with two 2 MBit serial lines puts too much load on the CPU and isn't suggested. b) The routing protocol only fills the routing table with two paths for the destination router / network. How the packets travel to the dstination network is a matter of the router operating system (IOS)... c) If the first packet arrives on the source router (the one who sits on the backbone from which two equal-cost paths lead to the destination router) the router doesn't find an entry in the fast cache and has to look up the routing-table. When finding a route it makes a "random" decision, which path to use, transmits the packet and makes an entry in the fast cache. d) the entry of the fast cache usually has a lifetime of about 10-15 seconds. Subsequent packets will choose the path which is in the fast cache which, and the fast cache will life for another 10-15 seconds. e) If no subsequent packets arrive the fast-cache times out. If a new packet arrives for the destination it starts again at c)... So my initial question wasn't correct, assuming the routing protocol had something to do with the transport through path 1 or 2 ... I thought I should give you something back, after increasing my learning courve ;-) Thanks again Andreas /// -- Andreas Klemm http://www.FreeBSD.ORG/~andreas http://www.freebsd.org/~fsmp/SMP/SMP.html powered by Symmetric MultiProcessor FreeBSD To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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