在实际的网络环境中，交换机的各种问题层出不穷，这里我遇到一个案例。关于Cisco 2960 S 交换机重启的问题。
故障描述：有那么几台C2960S交换机总是随机的重启。
原因：从show ver来看，可以看到是由于power-on。
实际问题：而实际导致交换机重启的原因并不是power-on，甚至这里没有一个crashinfo的生成。
关于这个问题，在思科官网能找到类似的问题，但是是一个bug：
2960S silent reload with "System returned to ROM by power-on"
CSCtr78622
Symptom:
A 2960S may reload without generating a crash file and reload reason is
reported as "System returned to ROM by power-on".
Conditions:
This issue is observed in Catalyst 2960S platform running 12.2(53)SE2.
Workaround:
None.
This bug is under investigation.
Further Problem Description:
CSCtg09555 should report more detailed reload information.
A 2960S may reload without generating a crash file and reload reason is
reported as "System returned to ROM by power-on".
Conditions:
This issue is observed in Catalyst 2960S platform running 12.2(53)SE2.
Workaround:
None.
This bug is under investigation.
Further Problem Description:
CSCtg09555 should report more detailed reload information.
问题延伸，该问题可能不只是C2960S的问题，其他的型号也有类似的问题，例如如下的Bug：
2960x randomly reloads due to power-on
CSCus47446
Symptom:
Catalyst 2960x may reboot randomly and come up. This can happen when switch is a stack member or standalone. When part of stack as a member, entire stack does not go down when a member reloads, but everything connected to the 2960x that reloaded experiences an outage.
There is no crashinfo written. Reload reason is "power-on".
Conditions:
Only PoE models are affected.
Workaround:
None.
Further Problem Description:
Catalyst 2960x may reboot randomly and come up. This can happen when switch is a stack member or standalone. When part of stack as a member, entire stack does not go down when a member reloads, but everything connected to the 2960x that reloaded experiences an outage.
There is no crashinfo written. Reload reason is "power-on".
Conditions:
Only PoE models are affected.
Workaround:
None.
Further Problem Description:
终结的意思可能是该问题已经通过换硬件解决了，没有通过配置或者软件的升级去解决这个问题。
2960x FPS48 randomly reloads due to power-on
CSCuu90830
Symptom:
Catalyst 2960x may reboot randomly and come up. This can happen when switch is a stack member or standalone. When part of stack as a member, entire stack does not go down when a member reloads, but everything connected to the 2960x that reloaded experiences an outage.
There is no crashinfo written. Reload reason is "power-on".
Conditions:
The switch that reloaded is a PoE capable 2960X
Workaround:
None.
Further Problem Description:
This could be a hardware issue, please contact Cisco TAC for further analysis.
Catalyst 2960x may reboot randomly and come up. This can happen when switch is a stack member or standalone. When part of stack as a member, entire stack does not go down when a member reloads, but everything connected to the 2960x that reloaded experiences an outage.
There is no crashinfo written. Reload reason is "power-on".
Conditions:
The switch that reloaded is a PoE capable 2960X
Workaround:
None.
Further Problem Description:
This could be a hardware issue, please contact Cisco TAC for further analysis.
这应该算是一个严重的错误了。不知该问题后续是否有fixed版本。