我试图根据发生的停机时间来衡量我们的 cisco 路由器可用性数据。我假设从显示版本，标签“系统返回到 ROM”中提到的时间是重新加载开始的时间，下一行“系统重新启动于”是路由器重新在线的时间。唯一令人困惑的是 RouterA 节点显示返回到 ROM 的确切时间，而 RouterB 则没有。

有人知道不同吗？以及如何让RouterB在show version命令打印出来时显示下一次路由器重新加载的确切时间？

谢谢

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, 11 weeks, 6 days, 16 hours, 29 minutes
Uptime for this control processor is 4 years, 11 weeks, 6 days, 16 hours, 25 minutes
System returned to ROM by reload (SP by reload)
System restarted at 01:04:31 JAVT Wed Oct 10 2012
System image file is "bootdisk:s72033-itpk9v-mz.122-33.IRI.bin"
Last reload type: Normal Reload