question about 3750 stack

[shahaij]

Hi,

I have 3 3750 switches: WS-C3750G-12S-S, WS-C3750G-16TD, WS-C3750G-16TD.

They are connected via Stack Cable in half-duplex mode.

I have a 10GE module(X2-10GB-LR=) on WS-C3750G-16TD.

the bandwidth of the logical switch should be 32Gbps. My question is about oversubscribe. totally there are 44 Giga ports. how these 44 Giga ports and 1 10Giga port share this 32Gbps? And what's mean half-duplex for stack mode?

Thank you very much.

Regards,

Sha

[Georg Pauwen]

Hello Sha,

this might not directly answer your question, but the way I understand the StackWise technology is that the switches in the stack form a logical ring, with a maximum backplane throughput of 32Gbps, as you already said. Each packet on each switch is load-balanced across the ring. The ring/backplane supports 32Gbps max, if you have more ingress bandwidth than that, the 32Gbps will still be the limit.

I found this article, which explains some of the issues, you might want to have a look at it:

Cisco Catalyst 3750 stackable switches

http://www.networkworld.com/reviews/2003/0811revcisco.html

HTH,

GP

[shahaij]

GP,

Thank you. I think I was confused by GigaStack and StackWise. I will read the article you show. Thanks.

Rgd,

Sha