DHCP snooping and ip helper address

From: Geert Nijs (Geert.Nijs@simac.be)
Date: Tue Jan 15 2008 - 18:53:37 ARST

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Hi group,

I am looking for details regarding DHCP snooping when implemented on the standard 3-tier design:

[L3 switch - ip and HSRP defined for vlan x] ----------------- [L2 Access switch with ip for management in vlan x]

The L2 access switch is running DHCP snooping.
Wheir do i have to configure my ip helper address ? On the L3 switch or on the L2 switch ?
I have the impression that my DHCP is not working anymore if i enable ip helper on L3 switch and DHCP snooping on the L2 switch...
It only works when ip helper is defined on the L2 switch. Why ?

Does anyone have details regarding the interaction of ip helper address and DHCP snooping ?

regards,
Geert

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