17.1.2.6 Compatibility with MSTP, RSTP and STP
Protocol
For the STP protocol, the MSTP will send the STP BPDU to be compatible with it like the
RSTP. For detailed information, refer to the "Compatibility of RSTP and STP‖ section.
For the RSTP protocol, it will process the CIST part of the MSTP BPDU, so it is not
necessary for the MSTP to send the RSTP BPDU to be compatible with it.
Each device that runs STP or RSTP is an independent Region, and does not form the same
Region with any other device.
17.2 Overview of Optional Features of
MSTP
17.2.1 Understanding Port Fast
If the port of the device is connected with the network terminal directly, this port can be set as
the Port Fast and be Forwarding directly, by which to avoid the waiting process for the port to
the Forwarding (If the port of the Port Fast is not configured, it needs to wait for 30s before
the forwarding). The following figure indicates which ports of one device can be set as the
Port Fast enabled.
Figure 17-21
If the BPDU is received from the port with the Port Fast set, its Port Fast Operational State is
disabled. At this time, this port will execute the forwarding by normal STP algorithm.
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