Date: Wed, 31 Mar 2004 01:32:02 -0700 From: "Chance Whaley" <chance@dreamscope.com> To: "'Wes Peters'" <wes@softweyr.com>, "'Steven Stremciuc'" <steve@freeslacker.net>, <freebsd-net@freebsd.org> Subject: RE: Looking for switch recommendations ... Message-ID: <20040331083141.948604CA35@caliban.dreamscope.com> In-Reply-To: <200403301406.05470.wes@softweyr.com>
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> -----Original Message----- > From: owner-freebsd-net@freebsd.org > [mailto:owner-freebsd-net@freebsd.org] On Behalf Of Wes Peters > Sent: Tuesday, March 30, 2004 3:06 PM > To: Steven Stremciuc; freebsd-net@freebsd.org > Subject: Re: Looking for switch recommendations ... > > > Every switch that does port mirroring probably has some > problems related to port mirroring, because mirroring > typically cannot be done in hardware. If nothing else, you > can expect some degraded performance on the port(s) being > mirrored and on the port doing the mirroring, because the > packets have to be fondled by the CPU before they can be > switched. Even with a really fast processor, this will > increase the latency a bit. This is an untrue statement. There are several switch vendors that pride themselves on their wire-speed mirroring capabilities - specifically their ability to do it in hardware. Foundry's BigIron and the like comes to mind as a highly reliable and fairly inexpensive (subjective) switch that is very capable of doing multi-port wirespeed mirroring at line rate. .chance
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