Migration of users in different vlans of 3750 Switches

I have 30 switches of access (3750). I require To migrate 1200 users connected to this switches of vlan 1 (172.23.8.0 /22) to vlan 2 (172.23.52.0 /22). They changed in server DHCP the rank 172.23.8.0 /22 to 172.23.52.0 /22. ¿In this case the only solution is to change the ports of switches of vlan 1 to vlan 2?. Can i configure 2 vlans in the ports of switches 3750?. What you recommend to make this migration in the efficient form?

well you could use the command interface range fastehternet 0/1 - 48 (change the command according to your ports) and then execute the switchport access vlan 2 command.
Like this all the ports will be changed in one shot. When to do it.....well during a weekend.
The biggest problem is see is that the workstations have to get a new IP address from DHCP after the migration so i suggest that you put the lease expiration to one day. Like this all the workstations will ask for a new ip address every day and after the change to vlan 2 they will ask an ip and everybody will have connectivity and it should be transparent for the user than.
FYI A switch port can always only belong to a single vlan or it has to be a trunk port to support multiple vlans what is not recommended in your situation.
Yves
rate this post if it helped
Yves

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