Monitor your top protocols on your cisco router

What if you want to find out what’s taking up your bandwidth but you don’t have netflow or any monitoring tool available? All you have if your Cisco router. The answer is NBAR (Network-Based Application Recognition). It is so simple! On the WAN interface, configure terminal interface fa0/4 ip nbar protocol-discovery To see the stats: show ip nbar protocol-discovery stats bit-rate top-n 5 The show command is basically asking to show the top 5 protocols being used in the network. Obviously my router is not connected to a network, so it wouldn’t capture any traffic for the time you have activated nbar.