Switches, Hubs, and Modems
cancel
Showing results for 
Search instead for 
Did you mean: 

Changing Subnet Mask on a bunch of switches?

Changing Subnet Mask on a bunch of switches?

I have to change the subnet mask on a bunch of 26XX switches (about 300 of em). Does anyone have an easier way to do this than going to each and every switch with a console cable and changing it?
2 REPLIES
Matt Hobbs
Honored Contributor

Re: Changing Subnet Mask on a bunch of switches?

I'm thinking the way to do it remotely is to upload a new config with the revised subnet mask.

Mohieddin Kharnoub
Honored Contributor

Re: Changing Subnet Mask on a bunch of switches?

Hi

Say you have 172.16.0.0/16 network range, and you need to change it to 192.168.1.1/24 range.

Add another IP address to your computer, say 192.168.1.10/24, then telnet to first switch, example 172.16.0.1,

Then what you have to do is, add another secondary IP address to Vlan1 (or to the same Vlan you are in with the switch),

Switch(Config)#vlan 1 ip add 192.168.1.100/24

then remove the old IP address:
Switch(Config)#no vlan 1 ip add 172.16.0.100/16

You will disconnected in this case, then ping the other switch's IP 192.168.1.100, and telnet to it, and you can add another new IP address or change the one you've set (192.168.1.100) ....

Good Luck !!!
Science for Everyone