In order to monitor a router, we can use the following:
Case 1: Monitoring the switch port that the router is connected to:
- In this case, numbered 2 in the previous drawing, we connect our laptop to the switch that the router is connected to
- On the switch, configure the port mirror from the port that the router is connected to, to the port that the laptop is connected to
Case 2: Router with a switch module
- In this case, numbered 5 and 6 in the previous diagram, we have a switch module on the router (for example, Cisco EtherSwitch® or HWIC modules), we can use it the same way as a standard switch (numbered 5 for the LAN port and 6 for the WAN port, in the previous diagram)
In general, a router does not support the port ...