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Network design reference

Medium Priority
Last Modified: 2012-05-07
Can someone provide me with a reference on small to small-middle sized LAN planning?
I've got a LAN which is growing.
It had 3 GB 24 port switches and now has 4
We need more ports for clients and I wonder at at what point one should do something other than interconnect identical switches.
Also interested in whether to concentrate to servers on one switch and  the workstations on another. (or some other strategy)
I can buy a book if needed.
It's all MS: Windows 2003/8, Exchange 2007, OCS, SQL, Vista, all workstations are GB NICs.
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can depend on the backhaul ( the amount of bandwidth available on the backplane).
And the amount of 'intelligence' in managed switches as they can have limitations with number of MAC's per port, but if they are just dumb layer 2 switches, I know of no specific limitation anyone has met.
most upgrades seem to come from added functionality (like management), or increases in bandwidth, 10Gig ports for server etc..

Or many are now getting layer 3 switches and arranging VLAN's within the office..

Powered Ethernet is getting more popular.

As are redundant links..


They are just dumb layer 2 switches.
What do you mean by backplane?
each switch has an internal backplane which is the maximum amount of data that can flow through the switch at any moment.

That would be all ports data communication added together, over a second.
So a 24 Port Hub, running at 1Gig continuously, would require a 24Gig backplane.
I'd bet money your one is not that high, but unless that becomes a problem with retransmissions and failures, it is rarely an issue.


No problems, so I just keep adding switches?
And what about what I plug into which switch?


Why would I want a VLAN? Everyone access the same data and apps.


I'd still be interested in a basic reference covering these topics.
obviously, spanning the switches puts a greater load on them, and if all your servers are on the last switch, and most of the active clients are on the first, that is a lot of data going across four switches..

If you had port mirroring, you could sniff the links and look at the utilization of the links under load, otherwise you'll need specialized testing equipment.

Another way is to keep your eye on the network stats of the interfaces in question (usually servers) by using network monitor (included in server) or intermittently by using netstat -e and 'netsh interface ip show interface'



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