3750 Uplink Question

Answered Question
Jun 8th, 2007

We are looking to upgrade our Communication Clostes. In our ground floor closet we have 8 24 port 10/100 switches with 1gb uplink.

We would like to replace them with 4 3750G-48PS-S and would stack them for easy of administration. In a stack situation could I plugin all 8 uplink cables or would I be restrict to 4 via SFP?

Thanks!

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This would depend on your topology.

Will all 8 of your uplinks be going to the same core/distribution switch. Or will 4 be going to one switch and 4 to another.

The 3750's support cross stack etherchannel and will allow up to 8 links within a single etherchannel. so if all uplinks are going to the same device spanning-tree will not block any of the ports and all 8 will forward traffic. If you are triagulating the stack with 2 core/dist switches and have 4 uplinks to each then 4 will are likely to be in blocking state and the other 4 in forwarding state providing that the link between the two core/distribution switches are not blocking.

Hope this helps

Martin

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Correct Answer

This would depend on your topology.

Will all 8 of your uplinks be going to the same core/distribution switch. Or will 4 be going to one switch and 4 to another.

The 3750's support cross stack etherchannel and will allow up to 8 links within a single etherchannel. so if all uplinks are going to the same device spanning-tree will not block any of the ports and all 8 will forward traffic. If you are triagulating the stack with 2 core/dist switches and have 4 uplinks to each then 4 will are likely to be in blocking state and the other 4 in forwarding state providing that the link between the two core/distribution switches are not blocking.

Hope this helps

Martin

bleucube Fri, 06/08/2007 - 06:53

Thanks Martin, definitely helps. The 8 links does go to the same core.

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