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Cisco IP Helper-Address

Posted on 2012-08-16
Medium Priority
Last Modified: 2012-09-03
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?
Question by:bsfoote
  • 2
LVL 18

Accepted Solution

Garry Glendown earned 1000 total points
ID: 38301363
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 ...
LVL 11

Expert Comment

ID: 38301429
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

a vlan conf could like like:

conf t
int vlan 2
ip address
ip helper-address

Author Comment

ID: 38306075
Both of you have covered my current setup, is there somewhere in VMware besides the IP and binding on the DHCP server?
LVL 18

Expert Comment

by:Garry Glendown
ID: 38306279
VMWare has interfaces that are usually bound to certain vlans and physical ports. Make sure you're actually in the right vlan...

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