Getting Broadcast traffic from one 3745 to another

The topology is simple. Three 3550 switches as the backbone tied together using spanning-tree layer 2 wire speed switching. Very simple stuff there. Introduce 3745 access routers, one attached to each 3550, each loaded with 16port ESW, 1 GigE GBic card, and a 8A/S card.
The problem is we have systems that blow out broadcast traffic that needs to traverse accross all 16-ESWs. We have tried all manor of things but we can not get broadcast traffic to traverse the 1GE port. We can see packets hitting the interface but they are simply getting dropped on the floor.
I can go into more detail if needed but we think we're missing a painfully simple detail. Perhaps something to do with L3 and L2? Perhaps something to do with bridge groups or vlans or helper protocols?
Any wisdom to help us out would be greatly appreciated!

Dwayne
As you probably already know, the helper-address is configured on the interface that receives the broadcast to be forwarded. So if the broadcast source is in a 16ESW then I would expect the helper address to be configured on whatever interface (probably virtual) repersents the layer 3 interface for those layer 2 ports.
The function of helper address is that it takes a broadcast packet and forwards to some destination address. The general assumption is that the destination address will be unicast. The destination address can be a subnet broadcast (directed broadcast) and I assume that this is what you are trying to do. Is this correct? If so then be sure that you have ip directed-broadcast enabled on the interface where the destination subnet is located.
Another potential issue is identification of broadcast packets to be forwarded. Helper address is not intended to forward ALL broadcasts. There is a group of protocols that are enabled by default (DHCP, TFTP, etc). If the broadcast packets that you want to forward are not one of these default protocols then you need to use the ip forward-protocol udp command which would be configured on the interface receiving the initial broadcast (the same interface as the helper-address).
You probably have these already. But I can not find a good description of what is configured where and thought that a review of these principles might be helpful.
It probably would be quite helpful to post configs of at least one 3745 and also its associated 3550. If you do not want to post these on the forum please feel free to EMail them to me. My EMail address is available from my forum profile.
HTH
Rick

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