Syslog messages processed for OSPF monitoring

When syslog message processing is enabled for OSPF,
obtains configuration, change, and OSPF adjacency status information for the managed devices from syslog messages that are sent by the devices.
extracts the information from the syslog messages and updates the attributes of the appropriate topology objects in its repository.
Processing syslog messages is recommended for OSPF, but not required, because
polls the network for status information. However, if neither syslog messages nor SNMP traps are received by
, immediate asynchronous notification of status change is not available; instead, the response time is determined by the length of the SNMP polling interval (240 seconds by default).