[119294] in North American Network Operators' Group
Re: Layer 2 vs. Layer 3 to TOR
daemon@ATHENA.MIT.EDU (Brandon Galbraith)
Thu Nov 12 15:50:22 2009
In-Reply-To: <550031AE4E25FE40BCD5D6894BC95DD5013F17DC@DCPWMF303.polk.com>
Date: Thu, 12 Nov 2009 14:49:37 -0600
From: Brandon Galbraith <brandon.galbraith@gmail.com>
To: "Bulger, Tim" <Tim_Bulger@polk.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Nov 12, 2009 at 2:40 PM, Bulger, Tim <Tim_Bulger@polk.com> wrote:
> If you use stackable switches, you can stack across cabinets (up to 3 with
> 1 meter Cisco 3750 Stackwise), and uplink on the ends. It's a pretty solid
> layout if you plan your port needs properly based on NIC density and cabinet
> size, plus you can cable cleanly to an adjacent cabinet's switch if
> necessary.
>
> Slightly off-topic.. Consider offloading 100Mb connections like PDUs,
> DRAC/iLO, etc. to lower cost switches to get the most out of your premium
> ports.
>
Agreed. We use Netgear gigabit unmanaged switches for what Tim suggests to
save the higher-cost-per-port switchports for server gear.
-brandon
> -Tim
>
> -----Original Message-----
> From: Seth Mattinen [mailto:sethm@rollernet.us]
> Sent: Thursday, November 12, 2009 3:20 PM
> To: 'nanog@nanog.org'
> Subject: Re: Layer 2 vs. Layer 3 to TOR
>
> Steve Feldman wrote:
> >
> > On Nov 12, 2009, at 2:48 PM, Raj Singh wrote:
> >
> >> Guys,
> >>
> >> I am wondering how many of you are doing layer 3 to top of rack
> >> switches and what the pros and cons are. Also, if you are doing layer
> >> 3 to top of rack do you guys have any links to published white papers
> >> on it?
> >
> > Dani Roisman gave an excellent talk on this subject at NANOG 46 in
> > Philadelpha:
> >
> >
> >
> http://www.nanog.org/meetings/nanog46/abstracts.php?pt=MTQwOCZuYW5vZzQ2&nm=nanog46
> >
>
>
> I'd always wondered how you make a subnet available across racks with L3
> rack switching. It seems that you don't.
>
> ~Seth
>
>
--
Brandon Galbraith
Mobile: 630.400.6992
FNAL: 630.840.2141
