R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

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• After specifying the current device as the root bridge or a secondary root bridge, you cannot
change the priority of the device.
• If two or more devices have been designated to be root bridges of the same spanning tree instance,
MSTP will select the device with the lowest MAC address as the root bridge.
• The values of forward delay, hello time, and max age are interdependent. Inappropriate settings of
these values may cause network flapping. HP recommends you to set the network diameter and let
the device automatically set an optimal hello time, forward delay, and max age.
• If the device is not enabled with BPDU guard, when a boundary port receives a BPDU from another
port, it transits into a non-boundary port. To restore its port role as a boundary port, you need to
restart the port.
• Configure ports that are directly connected to terminals as boundary ports and enable BPDU guard
for them. In this way, these ports can rapidly transit to the forwarding state, and the network security
can be ensured.