From: WorkerBee (ciscobee@gmail.com)
Date: Tue Jul 25 2006 - 15:15:13 ART
By connecting the servers directly to core/distribution, you need to administer
alot of Layer 2 issues such as HSRP, VTP domain, etc. Hence, make your Layer 3
core / distribution less scalable.
Hence I will prefer to offload these Layer 2 to dedicated pair of
Server Access switches
such as 6500 or 4500 with 10GE uplinks. Hence I run Layer 3 routing
between my server
farms switches and backbone.
Hence, I have the Layer 3 demarcation point between Server Farms and Backbone
which is useful for creating Security Policy.
On 7/26/06, Guyler, Rik <rguyler@shp-dayton.org> wrote:
> 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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