05-31-2012 03:34 AM - edited 03-07-2019 06:59 AM
I have a number of 3750 switches stacked with the cables at the back.
I now have a brand new 3750G 24-TS to install and I presume it makes sense for it to be the stack master as its the latest switch with the newest IOS.
Should I just plug it in, or clear the config from the existing ones and give this new one an IP adress before plugging it in?
I have only the default VLAN1 at the moment and none of the switches have been configured with smartports etc. Some have even just picked up DHCP IP addresses.....
Going forwards I will be creating some VLAN's and configuring certain ports for certain systems and functions so I want to ensure the stack is configured correctly from the beginning.
Thanks in advance for any help/advice/suggestions!
05-31-2012 04:04 AM
Hi Paul,
You should make a new switch priority higher than the others before adding it to the stack.
Please see this steps for adding a switch as a master:
Also, the software on the switches should be the same.
Kind Regards,
Ivan
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05-31-2012 06:22 AM
thanks for the advice.
One of the existing switches seems to be a different IOS version, its a IPSERVICESK9-M image rather than a IPBASE-M that the new Master is.
What's the easiest way for me to sort this out?
And also, how do I clear the config on this 2nd switch so its gets all its settings form the new master?
05-31-2012 07:03 AM
Hi Paul,
Here are the steps to upgrade the switches in a stack:
In short, you need to (example for 2 switches in a stack):
1. Check that you have enough space:
dir flash1:
dir flash2:
2. Copy new image file to both switches
copy tftp: flash1:
copy tftp: flash2:
3. Configure the boot variable to boot the switch with the newly copied IOS:
(config)#boot system switch all flash:/
(config)#exit
write memory
4. Reload and Verify
reload
show version
5. To clear configuration, you have to erase both configuration and vlan database:
write erase
delete flash1:vlan.datdelete flash2:vlan.dat
5. Power down the stack. Set new master with priority 15 and connect to the stack, then boot up.
6. Verify it is master and current IOS version:
show switch
remote command all show version
PS: make sure that after adding a master the stack boots with correct IOS version. Master should have the boot string set properly.
Kind Regards,
Ivan
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edited by: Ivan Shirshin
05-31-2012 08:52 AM
Thankyou, I will try this and let you know.
One other question, can a switch connected via fibre to a stack member participate in the stack?
05-31-2012 01:10 PM
Hi,
I had this problem where a stck was meant to be for two 3750s but someone connected three switches and when I removed one and modified the priorities, I didn't have connectivity and it was thinbking that there must be three switches. even teh stand alone switch which was part of teh stack, was thinking it was still a stack member!?
renumbering and write earse did not resolve my problem until I use two new switches to create a new stack of two 3750s.
I performed write erase with cables attached, with cables removed but no result!?
so I was wondering what may have gone wrong? or what imust have done that I had not done to have the original switches work as a stack of two?
thanks,
Masood
05-31-2012 05:48 PM
Your removed stack member could have been a provisioned one. In such case you need to run a command to un-provision it after disconnecting from stack. E.g.:
no switch 2 provision ws-c3750-48ts
Kind Regards,
Ivan
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05-31-2012 03:32 PM
Hey Paul,
Before you go and upgrade the IOS of your switches, make sure you know what are the flash memory capacity of each of the switch stack members. 3750/3750G comes in two sizes: 16 and 32 mb flash memory.
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