[c-nsp] VRF IP Helper

Steve Mikulasik Steve.Mikulasik at civeo.com
Thu Apr 14 12:23:02 EDT 2016

I am trying to setup ip helper on a 3750G 12.2(55)SE10. The SVIs are on the "GUEST" vrf and the DHCP server is in global. With "ip helper-address global" set on the SVI the switch seems to be forwarding using the SVI's IP rather than an IP in global. This behavior is different on my 3850s where an interface in global is used to forward the DHCP request.

Is there a way to set the source address for ip helper or some other method to make this work?

Here is the debug

000122: 14:36:51: DHCPD: DHCPINFORM received from client 0174.d435.b7c9.bc (
000123: 14:36:51: DHCPD: Finding a relay for client 0174.d435.b7c9.bc on interface Vlan101.
000124: 14:36:51: DHCPD: Looking up binding using address
000125: 14:36:51: DHCPD: setting giaddr to
000126: 14:36:51: DHCPD: BOOTREQUEST from 0174.d435.b7c9.bc forwarded to
000127: 14:36:54: DHCPD: Reload workspace interface Vlan101 tableid 1.
000128: 14:36:54: DHCPD: tableid for on Vlan101 is 1
000129: 14:36:54: DHCPD: client's VPN is GUEST.

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