Re: ip helper-address Dependencies

Carlos Melo Romero · ‎06-16-2022

is it mandatory to enable "IP routing" on switches that require the use of an ip helper-address???

Regards!

MHM Cisco World · ‎06-16-2022

Yes if vlan you config ip helper is vlan x and DHCP server in vlan y
how VLAN x connect to vlan y without ip routing.
so you need ip routing

paul driver · ‎06-16-2022

Hello
you apply dhcp to a L3 interface - be it on a switch / rtr or any host that can forward dhcp requests

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Richard Burts · ‎06-16-2022

MHM is on the right track. helper-address processing requires layer 3 logic to be able to forward the dhcp request. And for the switch to have layer 3 logic enabled there must be ip routing enabled.

HTH

Rick