I have 4 vlans currently, 100,200,300,400. I have 2 offices and they both used the same numbers, but now I need to change on office because of a DR system that we are putting in. I need to change one office to VLANs 111-114. I understand that I can't just change the number. I have to create these new vlans and move the associated IP addresses. Here is what I did.
I created the new vlans
config t
int vlan 111
int vlan 112
int vlan 113
int vlan 114
remove the IP from the old vlans
int vlan 100
no ip address
int vlan 200
no ip address
int vlan 300
no ip address
int vlan 400
no ip address
add the ip to the new vlan
int vlan 111
ip address 192.168.1.1 255.255.255.0
ip helper-address 192.168.1.20
int vlan 112
ip address 192.168.2.1 255.255.255.0
ip helper-address 192.168.1.20
int vlan 113
ip address 192.168.3.1 255.255.255.0
ip helper-address 192.168.1.20
int vlan 114
ip address 192.168.4.1 255.255.255.0
ip helper-address 192.168.1.20
Then I change the DHCP server (192.168.1.20) to use the new VLAN numbers. Then I change the Port channels to the access switches to the new vlan ids. Then the access ports on those switches. I then flushed the arp cache.
Here is the problem. All routing seems to be broken now. I can pull and IP from the DHCP server on the vlan 111 only. From the DHCP server I can ping 192.168.1.1, but not 192.168.2.1 or any of the other vlan ips.
What did I do wrong? Was I suppose to flush the MAC address table? Was I suppose to shutdown the old VLAN ids?
