Internet PC Networking

syslog is a client/server protocol standard uses for forwarding log messages in an IP network. It is typically used for computer system management and security auditing.
Most Cisco devices can use the syslog protocol to manage system logs and alerts.

However Cisco devices does not have large internal storage space for storing its logs. There are [...]

A Cisco IOS Access Control list (ACL) is used to define traffic. Once that “interesting” traffic is defined, some action can then be taken on that traffic.
Logging messages about packets permitted or denied by an IP access list is also available in Cisco IOS.

Logging-enabled ACLs provide insight into traffic as it traverses the network [...]