Migration of users in different vlans of 3750 Switches

[peguayapero]

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?

[mahmoodmkl]

HI

I would suggest u to use VTP i.e if u create the new vlan on the vtp server it is going to be propagated to all switches in the VTP domain.And where r all these vlans are terminating i mean where is the SVI for this vlan create a SVi for this vlan and assign it a DHCP HELPER-ADDRESS user it.then as u change the vlan ports on the switches they are going to get the ip address form the range u specified.

Thanks

Mahmood

[amit-singh]

Hi,

No you cannot make a port part of 2 vlans. What really you can od is to use the range command and assign all the ports that you want from vlan 1 to vlan 2 on every switch.

conf t

interface range gig 0/1/0 - 12

switchport access vlan 2

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225sed/cr/cli1.htm#wp2235379

HTH, Please rate if it does.

-amit singh

[ycae]

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