![]() On the other hand, older routers make things more confusing. Even better, you can access this unique number via Telnet, SSH, or SNMP. On newer routers such as the Cisco 2800 Series and 3800 Series, the serial number on the outside of the router, the processor ID, and the hardware chassis serial number are all the same. In addition, the results that you get will vary from router platform to router platform. In some cases, you may even find that none of the serial numbers that you find by connecting to the router actually match the serial number on the sticker on the outside of the router. One challenge with determining the serial number of your router is that there are so many different serial numbers - the processor board ID, serial numbers on every interface card, the chassis serial number, and many others. ![]() How do you collect these numbers without physically going to each and every router in your organization? Here's how to determine those serial numbers remotely. I mention the serial number specifically because you need it to both track your routers and to register for a Cisco SMARTnet service contract. At some point, it's a good idea to conduct a router inventory to determine which routers you have as well as their models, RAM, Flash, IOS versions, and serial numbers.
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