Determining bandwidth utilization by IP or MAC

[garycarter]

Is it possible to determine the bandwidth utilization of specific IPs or MACs over a T1 interface? If so, what's the command on a 3620 router?

Thanks.

[dgahm]

About as close as you can get on the router is ip accounting or ip netflow top talkers (requires 12.3(11)T). Both will give you the number of packets and bytes, but won't give you actual bandwidth. You can clear the count, and do a rough calculation based on bytes in a measured interval, but it is crude. If you have a Netflow collector (we use a NAM module)in your network you would be able to view the bandwidth.

interface s0/0

ip accounting output-packets

show ip accounting

clear ip accounting

[garycarter]

I'm not familiar with the Netflow collector. If you had one installed in a Cisco router, can it see traffic on other routers' interfaces as well as it's own?

[dgahm]

The Netflow collector is a client application that typically runs on a server. A NAM (network analysis module) can perform this function, and yes it can see flows from whatever routers are configured to use it. The NAMs are only available for 6500/7600 switches (I think).

Here is a link to info on the Cisco Netflow Collection Engine:

http://www.cisco.com/en/US/customer/products/sw/netmgtsw/ps1964/index.html