Cisco LAN Switching Fundamentals

Using Syslog Messages

Syslog messages provide a wealth of information as to the possible root cause of the outage by generating, for the most part, meaningful messages such as the reload of module or shielded twisted-pair (STP) root change, and so on. Cisco switches can be configured for various syslog levels on a per-protocol basis or globally for all protocols. For example, it is generally accepted to have spanning-tree syslog level set at 6, meaning the switch will display syslog messages that fall in the range of 0–6. The number of syslog messages generated is directly proportional to the syslog level. A syslog of level 7 generates a lot more syslog messages than a syslog of level 6, and so on. Therefore, syslog level 7 is primarily for ...