Since you use ACL 160 for each, it's hard to tell.<BR><BR>Basically, the ip helper address and exceptions for bootp should allow the 3550 to act as a relay for dhcp, turning requests (broadcasts ...

So the router needs it on the interface closest to the source of the broadcast.<BR><BR>So if the issue is related to using ip helper stuff, the config is the same for tftp vs dhcp.

The switches can deliver information about the available DHCP IP addresses using the command “show ip dhcp pool”, which returns a display that looks like this: Router# show ip dhcp pool 1 Pool 1: ...