Im trying to measure our cisco router availability data based on downtime happened. I assume from show version, the time mentioned in tag "System returned to ROM" is when reload started, and next line "System restarted at" is when router back online again. The only thing confusing is RouterA node showing time when returned to ROM while RouterB is not.
Does anyone know the different? And how to make RouterB shows the exact time router reloaded next time on the show version command?
Thanks Hadit
RouterA#show version Cisco IOS Software, s72033_rp Software (s72033_rp-ITPK9V-M), Version 12.2(33)IRI, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2012 by Cisco Systems, Inc. Compiled Fri 04-May-12 14:04 by prod_rel_team ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1) RouterA uptime is 4 years, 11 weeks, 5 days, 17 hours, 27 minutes Uptime for this control processor is 4 years, 11 weeks, 5 days, 17 hours, 19 minutes System returned to ROM by reload at 00:01:24 JAVT Thu Oct 11 2012 (SP by reload) System restarted at 00:05:58 JAVT Thu Oct 11 2012 System image file is "bootdisk:s72033-itpk9v-mz.122-33.IRI.bin" Last reload type: Normal Reload
RouterB#show version Cisco IOS Software, s72033_rp Software (s72033_rp-ITPK9V-M), Version 12.2(33)IRI, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2012 by Cisco Systems, Inc. Compiled Fri 04-May-12 14:04 by prod_rel_team ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1) RouterB uptime is 4 years, 12 weeks, 6 days, 17 hours, 51 minutes Uptime for this control processor is 4 years, 12 weeks, 6 days, 17 hours, 54 minutes System returned to ROM by reload (SP by reload) System restarted at 00:16:21 JAVT Wed Oct 3 2012 System image file is "bootdisk:s72033-itpk9v-mz.122-33.IRI.bin" Last reload type: Normal Reload
Do not rely on those commands to measure availability, you are much better off using a proper uptime tool to handle this for you, there are several free ones like Zabbix, PRTG and others and commercial ones like Solarwinds, HP NNM and others.
The output of those commands may change without notice hence not a good idea to rely on them for things that c an be automated using proper tools.