If you want to look into packets sent or received by a router, and there is no possible to display them by command, the simplest and fastest way is to use mirroring. Unfortunately, in case of AR routers, you have to go on-site to connect packets’ analyser (for example Wireshark). Comparing to NE routers, AR routers do not support remote mirroring.
There are two types of mirroring on AR routers:
Port mirroring is to copy all packets from mirroring port to another port, which is called monitor port. Monitor port is that where a monitoring device is connected to. AR routers support local port mirroring for inbound and outbound direction.
Traffic mirroring is to copy specified packets, by QoS policy, to a specific destination and send them to an interface for analysis. Traffic mirroring is supported on AR29 and AR49 routers.