Date: Tue, 24 Aug 2010 02:33:03 +0200 (CEST) From: Ingo Flaschberger <if@xip.at> To: "Li, Qing" <qing.li@bluecoat.com> Cc: net@freebsd.org Subject: RE: funny ECMP Message-ID: <alpine.LFD.2.00.1008240223240.12708@filebunker.xip.at> In-Reply-To: <B583FBF374231F4A89607B4D08578A4307F1FC70@bcs-mail03.internal.cacheflow.com> References: <alpine.LFD.2.00.1008230154280.29368@filebunker.xip.at> <alpine.LFD.2.00.1008240144350.12708@filebunker.xip.at> <B583FBF374231F4A89607B4D08578A4307F1FC70@bcs-mail03.internal.cacheflow.com>
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Dear Li, nice to hear from you. 1st: i have send in a bugfix: http://www.freebsd.org/cgi/query-pr.cgi?pr=149917 >> >> I have changed the route selection code of ecmp to >> balance only between routes of the same weight. >> (see attached file) > >> As Qing Li mentioned months ago, there are problems with static routes >> and interfaces. >> > > Do you have the exact link to the email thread? > There were no pending ECMP related issues since my last round of > commits > as far as I can remember. http://lists.freebsd.org/pipermail/freebsd-net/2010-January/024420.html http://lists.freebsd.org/pipermail/freebsd-net/2010-February/024539.html >> Example 1: >> ifconfig em1 alias 10.13.13.90/24 >> ping 10.13.13.95 ok >> route add 10.13.13.0/24 10.11.11.1 -weight 2 >> ping 10.13.13.95 broken (arpresolve: can't allocate llinfo for >> 10.13.13.95) >> > > Could you please explain a bit on exactly what you try to > accomplish here with this configuration? rebuilding my core-routers. it's a very special setup: 2 redundat core routers, connected via ospf (quagga), vrrp to server-side. currently I use a very modfied ucarp version because freebsd 6 only allows on route. problem is with standard freebsd and carp, that there is at the failover router a via ospf received route to the server-side interface. when now carp tries to add the route during failover, it fails. and seconds later the ospf route times out. so, i hoped to use carp, quagga and freebsd ecmp to be able to avoid this problems now. so I need route-merics (weights?) to prefer direct interface routes (connected) before static ones. perhaps I also need to change quagga to send also the merics to the kernel, as in differnce to, for example, cisco router, connected and static routes have the same weight. >> deleting the last static multipath routes seems to affect?, destroy? >> the interface route. >> system crashes in: >> /usr/src/sys/net/route.c:370 >> rn = rnh->rnh_matchaddr(dst, rnh); >> if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) { >> newrt = rt = RNTORT(rn); >> here -> RT_LOCK(newrt); >> RT_ADDREF(newrt); >> if (needlock) >> > > I will take a look. thanks. Kind regards, Ingo Flaschberger
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