关于archive（feature）
配置如下archive命令，可以记录登录到设备，具体配置了哪些命令：
R3(config)#archive
R3(config-archive)#log config
R3(config-archive-log-cfg)#
R3(config-archive-log-cfg)#logging enable
R3(config-archive-log-cfg)#notify syslog
R3#sho logging
Syslog logging: enabled (11 messages dropped, 0 messages rate-limited,
0 flushes, 0 overruns, xml disabled, filtering disabled)
Console logging: level debugging, 35 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 16 messages logged, xml disabled,
filtering disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: disabled
No active filter modules.
Trap logging: level informational, 38 message lines logged
Log Buffer (4096 bytes):
*Mar 1 00:19:35.555: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:19:52.779: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:20:44.227: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:logging enable
*Mar 1 00:20:47.935: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:20:56.847: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:interface Ethernet0/0
*Mar 1 00:21:00.967: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:ip address 23.1.1.3 255.255.255.0
*Mar 1 00:21:01.731: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:22:12.543: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:username cisco password cisco
*Mar 1 00:22:12.543: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:!config: USER TABLE MODIFIED
*Mar 1 00:22:13.327: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:22:45.299: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:archive
*Mar 1 00:22:50.751: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:log config
*Mar 1 00:23:00.003: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:notify syslog
*Mar 1 00:23:12.295: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:logging enable
*Mar 1 00:33:32.739: %PARSER-5-CFGLOG_LOGGEDCMD: User:console logged command:notify syslog
*Mar 1 00:33:38.299: %SYS-5-CONFIG_I: Configured from console by console
