Script to shutdown/reactive 3G interface based on monthly traffic

[Rui Carlos Antunes]

Hello.

Is it possible to have a script that can shutdown a 3G interface when a pre-defined monthly traffic is reached and that reactivates the interface on the first day of the following month?

The scenario is that a customer has a Cisco 800 3G routers with a 3G card from a Service Provider, that offers a rate for X Mbytes per month and that when those monthly X Mbps are exceeded, a differente rate (much more expensive) is applied for the excess traffic that month.

The customer would like to have the router NOT to active the 3G access when the X Mbytes (on that month) are exceeded.

What additional features should the script use? ip accounting? netflow?

Does anyone have an example of a script with a similar functionality?

Thanks in advance.

Best regards,

Rui Antunes

[Joe Clarke]

You don't need ip accounting or Netflow, really.  You could do this with SNMP byte counters.  The problem is reloads.  If the device reloads, you lose state.  Is that a concern?  Other than that, what you want is very doable.

[Rui Carlos Antunes]

Hello Joseph.

Thank you for your help.

Losing state due to a device reload is a concern, since for that month, we won't be able to guarantee that the 3G plafond is not exceeded. However, since a device reload should be rare, that is not very serious.

Is there any scripting examples for a similar function?

Best regards,

Rui Antunes

[Joe Clarke]

Try this.  You'll need to set a few EEM environment variables first:

event manager environment mobile_interface Cellular0

event manager environment mobile_datafile flash:mobile.dat

event manager environment mobile_threshold 100000000

The threshold is specified in bytes.