I am studying with Cisco Packet Tracer. Now I have a problem:
- A DHCP Server connect to switch A, with 3 VLAN 1,2,3
- 2 switches B,C connect to switch A, B is VLAN 2 and C is VLAN 3
- Some computer connect to B and C
I can use IP helper to help the computers in different VLANs contact DHCP server if all computers and server is connected into 1 switch, but I dont know how to do it in the above scenario with multiple switch. So how can I do that? And a bit of explaining is great.
Edit: I mean that: Should I set the port between 2 switches as Trunk or just Access? Should I set the other Switches with IP address, IP helper address, VLAN database like the main switch?
Edit: Follow Dougrritzer and Teun Vink answer, I set as follow:
Switch A:
enable
conf t
int fa0/1
switchport trunk encapsulation dot1q
switchport native vlan 2
switchport mode trunk
exit
int fa0/3
switchport access vlan 1
switchport mode access
exit
int vlan 1
ip address 192.168.1.1 255.255.255.0
exit
int vlan 2
ip address 192.168.2.1 255.255.255.0
exit
ip routing
end
Switch B:
enable
conf t
int fa0/1
switchport trunk encapsulation dot1q
switchport native vlan 2
switchport mode trunk
exit
int fa0/2
switchport access vlan 2
switchport mode access
exit
int fa0/2
switchport access vlan 2
switchport mode access
exit
int vlan 2
ip helper-address 192.168.1.2
end
And the computers on port fa0/2 still "DHCP request failed". Am I wrong at some points?
ip helper-address
from the downrange switches (i.e. B and C) and place it on Switch A.