SNMP between subnets?

I have two subnets on the local network, with the network management station on one subnet only.

There is a Cisco ethernet switch on the other subnet that I would like to monitor via SNMP

In order for the second subnet to see the SNMP (UDP port 161/162) traps is it just a matter of setting up some router rules between the networks, or is it trickier than that? (I have a simple Netgear router in place doing lan-to-lan routing and basic access-control-list stuff between subnets).

Or is there a magical Cisco IOS switch feature that allows SNMP packets to hop over to the other subnet?