Cisco IOS Logging, SNMP, and EEM: Syslog Levels, Traps, and Automation
Working reference for Cisco IOS visibility and automation. The 8 syslog severity levels (Emergency 0 through Debug 7) and how to threshold each destination, syslog config (buffered / console / host / source-interface Loopback0 for stable identity), service timestamps log datetime msec for correlation, SNMP v2c with ACL-restricted community strings vs SNMPv3 with auth+priv security level, EEM applets for event-driven automation (syslog pattern matching, time-based cron schedules, counters), example applets for interface-down alerting and auto-saving config, and the pitfalls (console at debug, missing source-interface, community without ACL, EEM runaway loops, no timestamps).