Analysis of Cisco IOS between 12 years ccie dump

For a while,  Beijing sent us a router with a 12-year licensed software version and the description is self-destruction for 12 years. Let's look at this case:

2901(config)# do sh lice all

Evaluation total period: 608 weeks 2 days

Evaluation period left: 608 weeks 2 days

License Count: Non-Counted

License Priority: Low

Storelndex: 1 Feature: securityk9 Version: 1.0

License Type: Evaluation License State: Inactive

Evaluation total period: 608 weeks 2 days

Evaluation period left: 608 weeks 2 days

As you can see from the above, this license is 12 years. Let’s take a look at the trial version of several commands.

2901(config)#do sh run | in boot

boot-start-marker

boot system flash0:/c2900-universalk9-mz.SPA.151-3.Tl.bin

boot system flash0:/c2900-universalk9-mz.SPA.153-3.Ml.bin

boot-end-marker

license boot module c2900 technology-package securityk9

license boot module c2900 technology-package uck9

license boot module c2900 technology-package datak9

2901(config)#

These orders are the most important. If you want to try the license, you only need to apply these few items. The general trial time is 8 weeks.

license boot module c2900 technology-package securityk9

license boot module c2900 technology-package uck9

license boot module c2900 technology-package datak9

This license is Cisco's RTU license mainly used to test the performance of some routers. If you do not purchase Cisco's license after expiration, it will continue to report some ambitions. Of course, the function will not be reduced but for some high requirements. Places, such as securities, banks, Separation, courts, etc. It will indeed bring some hidden dangers. For example, some important ambitions and these useless ambitions are reported at the same time. It is likely that some net workers have not noticed these important ambitions. Some have no necessary consequences.

How were these 12-year licenses formed?  Is the person in Beijing talking about cracking? At the beginning, I also believe that they have the means to crack this license but as the learning continues to deepen and the problems encountered in the project more and more, so do not believe in cracking this statement.

At that time, I specifically asked friends who worked at Cisco to check whether Cisco had a 12-year license. The results were checked for a long time, and there was no result. Cisco gave me the answer: no denial, no Determine this 12-year license. In actual use, it is true that this license. In addition to reporting some of the license expired, there is no problem need to buy the log,

After a long period of verification and determination of this matter, today I finally found out that this is a bug in Cisco's software. As long as you upgrade the IOS of a particular router, you can get a 12-year license.

This IOS with software bug is:

2901(config)#do sh run | in boot

boot-start-marker

boot system flash0:/c2900-universalk9-mz.SPA.151-3.Tl.bin

boot system flash0:/c2900-universalk9-mz.SPA.153-3.Ml.bin

boot-end-marker

In fact, there is a certain reason for this. The main reason is that the first IOS has no way to start it. It can be started from the second IOS. This is also a summary of experience. Everyone should have the awareness of alternatives when configuring.

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