Configuration Guide MSTP Configuration
Figure-6
If the path between Switch B and Switch C fails, Switch C will automatically
switch the alternate port to the root port. Consequently, the network topology is
generated as shown in Figure 7.
Figure-7
Rapid Convergence of RSTP
The following introduces the special function of RSTP: enabling rapid
forwarding on a port.
The STP protocol will forward packets after 30s since the port roles are selected,
which is twice as the Forward-Delay Time (you can set the Forward-Delay Time,
which is 15s by default). Furthermore, the root port and designated port of each
bridge will carry out the forwarding again after 30s, so it will take about 50s to
stabilize the tree-type structure of the whole network topology.
The forwarding procedure of the RSTP protocol is different from that of the STP
protocol. As shown in Figure 8, Switch A sends the specific proposal message
of the RSTP protocol. Switch B detects that the priority of Switch A is higher
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