Date: Fri, 14 Dec 2007 00:24:34 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Julian Elischer <julian@elischer.org> Cc: freebsd-net@freebsd.org, "Bruce M. Simpson" <bms@FreeBSD.org> Subject: Re: bikeshed for all! Message-ID: <20071213235843.Q81630@maildrop.int.zabbadoz.net> In-Reply-To: <4761B9CC.1020008@elischer.org> References: <476061FD.8050500@elischer.org> <200712130021.56473.max@love2party.net> <476072DB.3090600@elischer.org> <200712131549.21669.nvass@teledomenet.gr> <476190F2.2030105@elischer.org> <47619502.5070404@FreeBSD.org> <4761AC47.2010904@elischer.org> <20071213221607.Q81630@maildrop.int.zabbadoz.net> <4761B9CC.1020008@elischer.org>
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On Thu, 13 Dec 2007, Julian Elischer wrote: Hi, > since I've never heard of it before I don't know how standard FIB is? FIB (Forwarding Information Base) has been very standard for years and is often confused with foo and bar;-) [ Trying to get very simplistic explanation together at 1:15am ] A RIB (Routing Information Base, ...) might know lot's of different nexthops/paths to a given destination network usually learnt from various peers by routing protocols or ARP. In contrast to a RIB, a FIB only knows the "prefered nexthop for a network" or might even be a cache only for the most recently/often used network/nexthop lookups. (Search for CEF on your employers website for example). Basically that is what we (should) have in the kernel. So while I still have seen VRF in your last table, VRF, as the name says (Virtual Routing and Forwarding) is (usually) a combination of both. You have multiple FIBs together with at least one RIB (with the RIBs and related protocolls beeing well aware of your 'fibid', very simplistic view of all that). It get's a bit more complicated with all that stuff and I highly suggest to read the vendor documentations and RFCs on those topics. So to be precise VRF is not the right term for what you are doing either. To my best understanding you are doing a multiple FIB tables implementation. -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT Software is harder than hardware so better get it right the first time.
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