I am using a Cisco 3750 for my VLAN's off a Cisco ASA firewall. These VLAN's are just for Internet websites, and some WAN's.
Anyway, I have a 2nd Cisco 3750 that is racked below and has the same config which I update manually through the serial port just in case this switch fails I can swap the cables out of the main 3750 and put them is this 2nd 3750.
A very manual failover.
I had a couple of Cisco guys in today for something else and they just said I should stack them both so I can manage both via telnet/ssh and there would be failover should one fail.
They said make sure both 3750's are using the same IOS which they are and when I add the stack cable they will both reboot.
One chap said on the second (spare) 3750 remove all the IP stuff to stop conflicts, is this right? Please look at my config as I would like to do this soon.
The simplest option is to auto-provision the switch to the first switch in the stack. The configuration of the second switch can either be auto-provisioned or defaulted when added:-
Take a look at the following document:-
The first thing that you should do it ensure you have copies of your configurations.
Prior to provisioning the second switch, configure the first switch to Master, 'switch 1 priority 5', this will ensure that when you add the second switch it is not elected as Master.
The next step is to auto-provision the switch on this Master switch 'switch 2 provision ws-c3750-48ts' providing they are of the same type.
You will then discover that new ports have been added to the configuration starting 2/0/1 - 2/0/48.
Now you have the choice of auto-provising the configuration, by taking the configuration of the ports on the second switch and overlay them on the new port range.
If you don't do this now, all that will happen is that the second switch when added to the stack will have the default configuration applied to it and then you change the port configuration.
Hope this helps.
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