ZyXEL Communications ES 3500 Series Troubleshooting Manual page 46

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Can the Zyxel switch receive the multicast stream?
You can verify whether the switch is receiving multicast frames by looking at the port
counters. Locate the port of the switch in the direction of the multicast server.
Afterwards, check the port counters for received multicast packets. Check the port
counters again after a few seconds. A consistent increase of received multicast
packets is an indication that the port is receiving multicast streams.
Using Web GUI:
Figure 11 Status (Homepage) > Port Status > Port <number>
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