3750 adding switch to stack

Answered Question

i have a 5 stack switch connecting via stack cables in the data center. i want to add a 6th switch to the stack running from our IDF closet using a fiber connection. the stack doesn't seem to see the additional switch. how can i add this?

Correct Answer by glen.grant about 8 years 4 months ago

You cannot stack using a fiber connection , the only way you can stack a 3750 is using a stack cable in the back, what you have effectively done is make that other switch a standalone switch. No way around the stack cables if you want it to be part of a stack. If the switch is in a different closet then stacking that switch is not an option.

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JamesLuther Thu, 02/12/2009 - 06:41
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Hello,


What model are the current switches in the stack and what model is the new switch?


Why don't you connect the new switch using the stack cable (instead of fibre)?



Thanks

kelvin.blair Thu, 02/12/2009 - 06:48
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Per my experience by splitting the switches off a stack with stacking cables using fiber you are now create another distribution layer or access layer. So with that said, you need to ensure that you are trunking between the stack and the new switch or else route.


The switch must be in the same VTP domain and if a password is specified on the host, then that needs to be added as well. The new switch needs to be setup as a client. The port used to connect this additional switch will need "switchport mode trunk" as well as switchport trunk encapsulation dot1q". The port on the other end will need to match. Once that is done, wait a few minutes for the VLAN information to propagate down. At this point you should be good to go..


If this helps, please rate post.


Correct Answer
glen.grant Thu, 02/12/2009 - 06:59
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You cannot stack using a fiber connection , the only way you can stack a 3750 is using a stack cable in the back, what you have effectively done is make that other switch a standalone switch. No way around the stack cables if you want it to be part of a stack. If the switch is in a different closet then stacking that switch is not an option.

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