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DES-7200 Configuration Guide Chapter 10 MSTP Configuration
10-4
Figure-1
Figure-2
Figure-3
There are three port states for every port to indicate whether the data packet is
forwarded and control the topology of the whole spanning tree.
z Discarding: Neither forward the received frame nor learn about the source
Mac address.
z Learning: Do not forward the received frame, but learn about the source
Mac address, so it is a transitional status.
z Forwarding: Both forward the received frame and learn about the source
Mac address.
For the stable network topology, only the root port and designated port can be
the forwarding status, while other ports are only in the discarding status.