Giga Stacks 3550 xl and smi

[network_team]

I have over 50 switch stacked in sets of 3 or 4 giga stacked together. they appear to run at half duplex is this correct and should i force this to full dulplex. Could this cause slowness between the switches.

[Bobby Thekkekandam]

Hi,

The GigaStack GBIC will auto negotiate to either full-duplex or half-duplex depending on the way the cables are connected and the number of switches in the stack.

Note that although duplex can be forced, it is not supported. The only supported option for duplex is to leave it to auto-negotiate.

If they are stacked point-to-point (one GigaStack GBIC per switch and only one connection between the modules) then the gigastack will negotiate as full-duplex.

If they are stacked in a cascade (one GigaStack GBIC per switch with multiple connections between the modules), they will negotiate to half-duplex.

This is documented here:

http://www.cisco.com/warp/customer/473/150.html#topic1

HTH,

Bobby

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