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ip helper-address Dependencies

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

 

 

Regards!

3 Replies 3

MHM Cisco World
Advisor
Advisor

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
VIP Expert VIP Expert
VIP Expert

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


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Kind Regards
Paul

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