We help IT Professionals succeed at work.

Cisco IP Helper-Address

bsfoote
bsfoote asked
on
On a Cisco 3750x and ME3600's, do you need to put an ip helper-address on the layer 2 switches ofrjust the layer 3 switches?
Comment
Watch Question

Consulting and Network/Security Specialist
CERTIFIED EXPERT
Commented:
Normally, you put an IP helper on a L3 device in order to allow for L2-protocols like DHCP to contact other devices on other networks ... if you need to use a device from a separate  L3 subnet, you should have a router in place ... put the helper in there and you should be fine ...

Commented:
Garry-G is correct.

If for example;

you have a L3 core with connected L2 access switches with multiple vlans 2-10 and a dhcp server on 192.168.10.150

a vlan conf could like like:

en
conf t
int vlan 2
ip address 192.168.2.254 255.255.255.0
ip helper-address 192.168.10.150

Author

Commented:
Both of you have covered my current setup, is there somewhere in VMware besides the IP and binding on the DHCP server?
Garry GlendownConsulting and Network/Security Specialist
CERTIFIED EXPERT

Commented:
VMWare has interfaces that are usually bound to certain vlans and physical ports. Make sure you're actually in the right vlan...