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lan design questions

We plan to migrate our Fast EThernte LAN to Gigabit Ethernet. At first all our trunks will be Gigabit Ethernet, some of them on optic fiber and others on copper. The catalyst 2950 series is perfect for our requirements, we are considering 2950G with GBIC modules, 2950SX and 2950T

The 2950T and 2950SX are stand alone swiches and do not support stack modules. We plan to connect these switches to a Catalyst 4507R (core switch), but can we use the gigabit uplinks ports to connect to other access layer (2950G with GBIC modules) switches on the same floor, like a stack configuration?

4507R

|

| (Gigabit using the uplink port)

2950SX o 2950T

|

2950G

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Re: lan design questions

Yes, you can use the Gigabit Ethernet uplinks on the 2950SX-24 and 2950T-24 switches to connect to other access switches. Each link will function as a point-to-point connection, that will run at full duplex. Configure the uplinks as VLAN trunk ports or as a VLAN access ports, as needed.

On the 2950T-24 you may have to disable autodetect and force it to run at 1000 full, depending on what you're connecting it to over Cat5 cable, but that's not difficult to do.

The uplink ports on those switches are basically no different than if you had purchased all 2950G switches, and then populated the GBIC slots with 1000BASE-SX or 1000BASE-T GBICs. The only thing you can't do with them is host a GigaStack GBIC connection, and that's only because there are no GBIC slots. Other than that, they're functionally identical.

Just be careful how many access switches you chain together. The farther out you go, the more difficult it is for the nodes on the outermost access switches to reach the core when things get busy. This is due to contention for uplink bandwidth. Most data sessions will still get through, they may just take a couple milliseconds longer in most instances. But you could end up with some timeouts if congestion is really, really bad.

Hope this helps.

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