You can use netflow technology. See show mls ip or show mls netflow ip commands. Or if you want long-term monitoring you can use any netflow monitoring software. See http://www.cisco.com/go/netflow and commercial or freeware partners section.
There are many ways to check whether traffic is passing through an interface as explained by previous posters. Looking at the interface statistics which would display 5 min input/output rate is one way to check it. I understand your concern that this isn't the closest to real time traffic. The IOS does allow you to lower the display interval to as low as 30 seconds and this is the closest you can get to real time traffic. The command to set the interval to 30 seconds is 'load-interval 30' under the interface mode.
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.