The network is an interconnection of systems and devices. Any change on one device may lead to changes on other devices that might be directly connected or even multiple hops away. As an example, a high CPU on a device can lead to failure routing protocol packets from the neighbors and the routing adjacency going down. This will appear as separate log messages on the two devices.
In order to correlate the different log messages across devices, it is important that the log messages be timestamped, and should have a common time reference. This time reference is provided by Network Time Protocol (NTP).
In the absence of NTP, all devices will run a clock based on their local clock source that might not be very accurate. ...
