There is a command show inventory which appears to give the serial number of the router. My experience is that on some platforms (like 1841) it gives the correct value when visually compared to the number printed on the chassis but that some platforms (7200) give a value which is not correct. I do not have experience of show inventory and the 3640. Perhaps someone who does have experience with that platform can share their experience. Or if you have a 3640 that is local you can do the command and verify the results to know whether to expect the correct value on the remote router.
There are some people who believe that the serial number is shown in the output of show version. It may be so for some platforms. But I would try the show inventory first.
Below is for 3660 (which I have).. can't see it being different to the 3640.
As described in previous post, the 'sh ver' displays the 'Processor Board ID' which is the same as the Serial no label printed on the back of the router.
RME in Ciscoworks picks it up as 'User Defined Serial no' and Ciscoview displays it as 'Chassis ID'. On the 3660 it's all and the same serial number so chances are it'll be the same on 3640. Below is output from all three sources which corresponds with physical label at back of router.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.