HP Cisco MDS 9134 Cisco MDS 9000 Family Command Reference - Cisco MDS SAN-OS R - Page 116

Using Debug Commands Chapter 1 CLI Overview Send documentation comments to [email protected] Possible destinations include the console, virtual terminals, internal buffer, and UNIX hosts running a syslog server. The syslog format is compatible with 4.3 Berkeley Standard Distribution (BSD) UNIX and its derivatives. Note Be aware that the debugging destination you use affects system overhead. Logging to the console produces very high overhead, whereas logging to a virtual terminal produces less overhead. Logging to a syslog server produces even less, and logging to an internal buffer produces the least overhead of any method. To configure message logging, you need to be in configuration command mode. To enter this mode, use the configure terminal command at the EXEC prompt. Enabling Message Logging To enable message logging to all supported destinations other than the console, enter the following command: logging on The default condition is logging on. To direct logging to the console only and disable logging output to other destinations, enter the following command: no logging on Setting the Message Logging Levels You can set the logging levels when logging messages to the following devices: • Console • Monitor • Syslog server Table 1-8 lists and briefly describes the logging levels and corresponding keywords you can use to set the logging levels for these types of messages. The highest level of message is level 0, emergencies. The lowest level is level 7, debugging, which also displays the greatest amount of messages. For information about limiting these messages, see sections later in this chapter. Table 1-8 Message Logging Keywords and Levels Level 0 1 2 3 4 5 Keyword emergencies alerts critical errors warnings notification Description System is unusable. Immediate action is needed. Critical conditions exist. Error conditions exist. Warning conditions exist. Normal, but significant, conditions exist. Syslog Definition LOG_EMERG LOG_ALERT LOG_CRIT LOG_ERR LOG_WARNING LOG_NOTICE 1-42 Cisco MDS 9000 Family Command Reference OL-16217-01, Cisco MDS SAN-OS Release 3.x