I can have devices topology display under LMS campus manager. The topology also indicates the status of devices whether its alive (green) or dead (red). What are the method used by CM to get this information? Is it solely by SNMP polling? There is a polling variable a user can set, by default 2 hrs. Isn't 2 hrs is quite too long for someone to realize whether the device is already down or up? Does LMS uses ICMP to track the availability of devices as well?