nanog mailing list archives
Re: switch speed question
From: "Tony Varriale" <tvarriale () comcast net>
Date: Tue, 24 Feb 2009 10:04:36 -0600
That isn't always true. Some switches are already speced as full. It's best to read the product docs or speak with a rep to be sure.
tv----- Original Message ----- From: "Eric Gearhart" <eric () nixwizard net>
To: "NANOG list" <nanog () nanog org> Sent: Tuesday, February 24, 2009 9:51 AM Subject: Re: switch speed question
On Tue, Feb 24, 2009 at 2:33 AM, Bruce Grobler <bruce () yoafrica com> wrote:Hi,It depends on how heavily loaded your switch is expected to be, for instancetwo machines using the switch will be able to get a full 1Gbps, howeverdepending on the backplane (switching fabric), it limits how many ports willreceive full 1Gbps when the switch is congested, e.g. a 2 gig backplane against a 24 gig. Regards, BruceNote that the traffic to a switch is bi-directional (full duplex) - so a 24 port gigabit switch can max out its 32 Gig backplane, if all 24 ports have a gig coming in and going out (24 X 2 is 48, more than the 32 gig backplane). This isn't immediately apparent - the other day someone at my work asked the exact question "Why's the 32 gig backplane > the 24 ports on the switch?" -- Eric http://nixwizard.net
Current thread:
- switch speed question Deric Kwok (Feb 23)
- Re: switch speed question Brian Feeny (Feb 23)
- RE: switch speed question Bruce Grobler (Feb 24)
- Re: switch speed question Eric Gearhart (Feb 24)
- Re: switch speed question Tony Varriale (Feb 24)
- Re: switch speed question Roy (Feb 24)
- Re: switch speed question Chris Adams (Feb 24)
- Re: switch speed question Eric Gearhart (Feb 24)
- RE: switch speed question Holmes,David A (Feb 24)
- <Possible follow-ups>
- Re: switch speed question deleskie (Feb 24)
- Re: switch speed question Tom Storey (Feb 25)
- Re: switch speed question David Barak (Feb 25)
- Re: switch speed question Tom Storey (Feb 25)
- Re: switch speed question Nathan Ward (Feb 25)
- Re: switch speed question Dave Israel (Feb 25)
- Re: switch speed question David Barak (Feb 25)