IS there a command to track router traffic. I don't need to see what interfaces are up, or connected. But just to verify that traffic is indead passing across router.
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.
HTH
Sundar
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