Can Cisco switches/routers be discovered by any SNMP NMS on their broadcast IP addresses?
Came across an external link saying that they drop SNMP requests on subnet broadcast addresses.
What is the typical behavior?
A need for it? You mean a use for it? I think some people like to use it for SNMP discoveries (i.e. finding new SNMP hosts/devices on their network). However, as I said, many network management systems do not support broadcast addresses (e.g. CiscoWorks no longer supports them, and hasn't since ~ 1998).