Configuration Guide MSTP Configuration
If the BPDU message is received from the Port Fast enabled port, its Port Fast
operational state is disabled. At this time, this port will execute the forwarding by
normal STP algorithm.
Understanding AutoEdge
If the specified port doesn’t receive the BPDU message sent by the downstream
port within a certain period of time (3 seconds), the port will be considered that it
connects a network device and set as an edge port to enter the Forwarding
status directly. An edge port will be automatically identified as a non-edge port
after receiving the BPDU message.
You can disable the automatic identification function of the edge port by the
spanning-tree autoedge disabled command.
This function is enabled by default.
1) When the AutoEdge function conflicts with the
manually-configured Port Fast function, the latter shall prevail.
2) AutoEdge function can be used for rapid negotiation forwarding
between the designated port and the downstream port, so the
STP protocol doesn’t support AutoEdge. If the designated port is
in the forwarding status, Autoedge does not take effect on the
port. It will take effect during repaid renegotiation such as
pluging/unpluging network cables.
3) If a port enables the BPUD Filter, it forwards the BPDU message
directly, but not be identified as the edge port automatically.
4) AutoEdge function is only applicable for the designated port.
5) AutoEdge complies with the standard definition of IEEE 802.1D
(version 2004), in which the parameter range of Bridge Hello Time
has been modified as 1.0-2.0. Therefore, you shall confirm that
the Hello Time value is within the range when using AutoEdge
function, or the risk of temporary loop will occur. It is
recommended to disable AutoEdge function if it is neccesary to
exceed the range of Hello Time.
Understanding BPDU Guard
The BPDU guard can be enabled globally or on individual interface. There are
some slightly difference between these two ways.
You can use the spanning-tree portfast bpduguard default command to open
the global BPDU guard enabled status in the privileged mode. In this status, if
the BPDU message is received through a Port Fast-enabled port or a AutoEdge
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