ZyXEL Communications GS1920 User Handbook Manual page 40

2. The tree features are depend on the device and it's design, some of the
device can only configured 2 tree. Select and check how many STP to be
configured in MRSTP.
Figure 2,
3. Select and check which port to be configured and choose which STP (Tree) is it
configured in Figure 2, then Apply to save the configuration.
Figure 3,
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