I'm trying to diagnose a problem with an AVB endpoint. I have a Summit X440-8t with the latest software build and the avb license pack. Three ports are connected: one to the endpoint module I'm trying to debug, one to a Windows PC running an application that sends and receives avb traffic to/from the endpoint, and a third connected to a Linux PC running Wireshark. I have configured a mirror on the switch to duplicate all ingress traffic on the port connected to the endpoint to the monitoring port connected to the Wireshark PC.
When I set all of this going, I find that very little of the avb traffic actually ends up appearing on monitoring port, and the switch reports a high degree of congestion/packet loss on that port. There is no packet loss on either the port connected to the endpoint or on the port connected to the pc running the avb software - all 8000 packets per second appear to be flowing in both directions on these ports. But the number of packets appearing at the output of the monitoring port is of the order of a few 10s per second rather than the 8000 I might expect. The traffic that does turn up at the monitoring port has all the classes of packet I expect, but it seems to be dropping about 95% of the packets. This is puzzling (not to say more than a little frustrating).
I'm not an expert on switches, protocols, or related technologies, but I thought I had understood enough to set up what seems to me to be a very straightforward test. There must be something very fundamental I'm missing. Any ideas what I could try?