I have a question regarding VLANS and DHCP server.
I have a Cisco 3750 as a core L3 Switch
I create the 4 VLANS ,vlan 76 ( 172.16.76.0/24) Vlan 77 , Vlan78 and Vlan 81.
I associated one port to Vlan 76, one to Vlan 77 one to vlan 78 and remainimng to Vlan 81 ( DHCP and all other servers are in VLAN 81)
On VLAN 76 vlan 77 and VLAN 78 ,i connected L2 Switch ( all ports of the switch are on same VLAn respectively)
I have set the IP helper address on each VLAN.
Now when i first cconnect the PC to VLAN 76 DHCP server issue the Correct IP to the PC( 172.16.76.X) now when i removed my PC from Vlan 76 and plugged into the Vlan 78 MY PC again get the Ip address from VLAN 76 , where as it should get IP from Vlan 78 ( 172.16 78.x)
Could you please help me in resolving the problem?
Below is the configuration of the port assosiated with VLAN 76
switchport access vlan 76
switchport mode access
ip address 172.16.76.1 255.255.255.0
Ip helper-address 172.16.81.10
172.16.81.10 is the DHCP server.
I want that DHCP should issue the ip address according to VLAN.
Have you created an 'interface vlan78' ? If you have, and if you have given it a 172.16 78.x address, then the DHCP server will assign it an address out of the 172.16 78.x range, providing that you have created a scope on the DHCP server for the 172.16 78.x network.
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