From: David Timmons (masterdt@yahoo.com)
Date: Tue Jul 25 2006 - 15:51:33 ART
Hmm,
I do not like the 3750 as a core/distribution switch. This is especially true if you are using the 3750-48TS: supports only 13.1 Mpps. The 3750-TS does support 38.7 Mpps and is very close to Sup IV 48 Mpp; however, when you consider the $14,000 cost per 3750G-TS and 5,000 list per WS-X4548, the cost of the supervisor, chassis and redundant power supplies are comparable after about 144 ports. Since the 4500 is going to support 64 Gbps is a better choice to grow with your company. The 3750G-TS, in my opinion, is not the best choice for network core. I have had very bad luck with the 3750's backplan. Of course, the issues have been cause by activities in the general area of the switch, workers and cable guys, you can quickly watch an entire server farm get washed off the map. The Chassis solutions have been much easier to upgrade. We can upgrade Sup's, line cards, and power supplies to support a changing environment. Anyway....my 2cents.
dt
----- Original Message ----
From: "Guyler, Rik" <rguyler@shp-dayton.org>
To: "ccielab@groupstudy.com" <ccielab@groupstudy.com>
Sent: Tuesday, July 25, 2006 12:41:18 PM
Subject: FW: What's your View about these
If you connect the servers into a single device of any sort it becomes a
single point of failure. In our case, our servers are connected to two
separate switches using a failover NIC team. But, that's somewhat beyond
the scope of network design as such and should be a standard adopted by the
server team provided the network design supports such initiatives.
Rik
-----Original Message-----
From: James Ventre [mailto:messageboard@ventrefamily.com]
Sent: Tuesday, July 25, 2006 1:32 PM
To: Guyler, Rik
Cc: 'ccielab@groupstudy.com'
Subject: Re: What's your View about these
I'd consider your 3750 "stack" a single point of failure, if you're
using the stacking feature. I recently came across a scenario where
the stacking software between the 3750's wasn't functioning and no traffic
passed - in or out.
James
Guyler, Rik wrote:
> Our server farm connects into the network at the distribution layer,
> where we typically have better equipment and higher bandwidth
> backplanes. In our case, we use 4500 switches with Sup4s, which has
> been an excellent combination supporting over 300+ servers, mainframes,
minis, AS400s, etc.
>
> The 3750 series switches should also be a pretty good solution in this
> situation but the backplane will be much less than a more robust
> chassis switch. Be conservative on the number of switches in a single
> stack since I seem to recall the backplane in a stack runs at 32Gb.
>
> I would not directly connect anything directly into the core except
> for distribution and other core switches. Sometimes the demarcation
> point is not clearly defined so if your core and distribution layers
> are collapsed into a single device or layer then really, from an
> architectural perspective the 3750 stacks would be considered access
> layer but the reality is that they are still only a single hop away
> form the core so don't get too wrapped up into the terminology.
>
> Rik
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