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Need some help with helper addresses

D

djdrastic

Senior member
Hi guys jsut a slight problem atm

I have 2 VLAN's [ VLAN 5 and VLAN 7] on a C4003 , that are being trunked into their respective port channels [ Port Channel 1 , Port Channel 5 , Port Channel 7] .

My problem being , I have a DHCP Server located in the VLAN 5 segment and I need to have clients in VLAN 7 being able to contact the DCHP Server .

With my routers I'd normally , just use the ip-helper address command on the correct interface , but it doesn't seem to be an option in the port-channel1.X interfaces .

Anyone perhaps know of a way of getting those UDP Broadcasts to the DHCP Server ?

Thanks
djd
 
you have to have some sort of routing to get this there. Not sure what "Cisco 4000" you have, is that a switch? L2 or L3?

Iphelper is a ROUTER command, telling it where to route requests/replies. You cannot configure this on a switch unless it has L3 capabilities.
 
Do you have routing setup between vlans? (Not sure what that switch supports, I'm used to the CatOS based 6500's basic stuff, and smaller switches, like the 3550's)
 
yep, you need it on the router. don't know if that switch does routing. If is is sup1 then most likely not.

If you can type the command "ip routing" or "interface vlan 7" and assign IP addresses to it then it supports routing.

otherwise you'll need something else to do your routing for you.
 
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