Cisco Switch Stack

Unanswered Question
Mar 14th, 2007
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Hi all,

I have a pair of Cisco Catalyst 3750. I connect this two switches using stack cable.Can the two stackwise ports to be configured as trunk?


Wan Hwai

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dgahm Wed, 03/14/2007 - 12:13
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When you stack 3750s they become one virtual switch. There is no need to configure a trunk between the switches, all VLANs will be available to all ports.

Cisco StackWise Technology offers Stackable Resiliency

Cisco StackWise technology is a stacking architecture optimized for Gigabit Ethernet. This technology is designed to respond to additions, deletions, and redeployment while maintaining constant performance. Cisco StackWise technology unites up to nine individual switches into a single logical unit, using special stack-interconnect cables and stacking software. The individual switches can be any combination of Cisco Catalyst 3750 and Cisco Catalyst 3750-E Series Switches. The stack behaves as a single switching unit that is managed by a master switch, elected from one of the member switches. The master switch automatically creates and updates all the switching and optional routing tables. A working stack can accept new members or delete old ones without service interruption.

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wanhwai Thu, 03/15/2007 - 01:59
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hi dgahm,

Can this stackwise port replace fiber port or Ethernet port. Which mean i do not want to see 2 switches as one virtual switch.


Wan Hwai

dgahm Thu, 03/15/2007 - 09:42
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If you want to keep the switches separate you will not use the stackwise ports. In that case you would use copper or fiber ports between the switches configured as trunks.

Why do you want to keep the switches separate?


wanhwai Fri, 03/16/2007 - 00:29
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Hi dgahm,

I got short of ports. So i am thinking of whether can use stackwise port to replace normal copper or fiber port.

Besides, the throughput is higher.

Steven Hoo

dgahm Fri, 03/16/2007 - 09:03
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The stackwise ports can not be used as ethernet ports.


frederic.nilsso... Fri, 03/16/2007 - 11:34
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Hello Steven, if you have an shortage of ports on the switch you should be able to consolidate the two switches into one with the stackwise cable and thus freeing up the ports you are using today as a trunk/channel between them.

The stack ports aren't Ethernet ports, it's more of an extended backplane making your ports to be addressed with 1/0/1-48 and 2/0/1-48 instead..

Hope this was in some way enlightening.



wil_amaya Tue, 04/17/2007 - 19:43
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or he can add another 3750 to his stack and have another bunch of ports available to him.


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