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Stacking 2 Cisco 3750 switches

Posted on 2009-04-01
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Last Modified: 2012-05-06
I have a core switch that is a 3750 24 port and another 3750 that is a 48 port, I want to stack the switches so that the core switch will be the master. Both switch are on the network and configured with 2 vlans, the core switch is the root bridge and I want to keep it the root bridge. I'm wanting to know how to stack them and any problems I might encounter?

The IOS's are:
(C3750-IPSERVICESK9-M), Version 12.2(50)SE, RELEASE SOFTWARE (fc1)

Thank you,
DSterling
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Question by:dsterling
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atlas_shuddered earned 500 total points
ID: 24042087
You will need to set the stack priority number of your core switch to a higher value than the slave(s).  Priority numbers can be assigned in the range of 0 - 15.  The higher the value the higher the selection priority.  On your slave(s), set a priority value less than the priority of the master.  I generally set my masters to 15 and all others to 10.

To set stack priority issue the command:

switch stack-member-number priority new-priority-value

Prior to stacking, the switches should have a stack-member-number of 1.  To verify this, issue the command:

show switch

*make a note of the switch mac address

After configuring your core switch with the higher priority, shut both switches down and cable them together with the smartstack cabling provided with your initial shipment.  After cabling is completed, reboot the switches.

Issue the command:

show switch

Using the mac you recorded above, verfiy that your core switch has been elected the stack master.

So far as problems you may encounter, none are readily expected.  At most I would be concerned with any vlan or vtp information that you have previously configured on the devices independently.  Port vlan assignments should remain the same but if the switches contain differing vlans I believe that your master will re-write the vlan database to show only what it currently has configured.  If this is the case, the ports that you have assigned to removed vlans would revert to default.
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by:dsterling
ID: 24042480
Thank you, I'll try this as soon as I get a chance
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