思科交换机自动冷重启动

恋恋笔记本

最近公司有两个汇聚节点（相隔20多公里）出现了一个现象：交换机会全部自动重启，日志显示是冷启动。其中汇聚节点一的汇聚交换机和接入交换机都在同一个机房内，全部冷启动；汇聚节点二的汇聚交换机和接入交换机分属于不同楼层（一共7台处于5处机房），除了汇聚交换机和1台接入，其他都冷启动。电工查看过机房，未发现断电情况，请问是什么原因？其中一台相关日志如下：
*Mar  1 00:02:43.803: %SNMP-5-COLDSTART: SNMP agent on host QLSBGL-2F-JRJH-2960-1 is undergoing a cold start
*Mar  1 00:02:43.824: %SSH-5-ENABLED: SSH 1.99 has been enabled
*Mar  1 00:02:44.547: %USB_CONSOLE-6-MEDIA_RJ45: Console media-type is RJ45.

QLSBGL-2F-JRJH-2960-1#show ver
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Mon 28-Jan-13 10:28 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01B00000

ROM: Bootstrap program is Alpha board boot loader
BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(55r)SE, RELEASE SOFTWARE (fc1)

QLSBGL-2F-JRJH-2960-1 uptime is 21 minutes
System returned to ROM by power-on
System restarted at 15:05:39 beijing Mon May 8 2017
System image file is "flash:/c2960s-universalk9-mz.122-55.SE7/c2960s-universalk9-mz.122-55.SE7.bin"