Can discovery cause some routers to crash?
A snmpget or snmpwalk to an unimplemented SNMP variable will cause a router running Cisco IOS version 8.2 to crash. (CSCdi11581) A router running Cisco IOS versions 11.2(08)SA3, 11.3, 11.3T, 11.3NA, 11.3WA4, may crash when trying to get a CDP enabled device’s address information when no IP address is assigned to that device.