3 Web-based Management
As for the configuration of Hello Time, Forward Delay Time, and Max Age, the following
formulas must be met to prevent frequent network jitter:
2 × (Forward Delay Time – 1 second) >= Max Age, and Max Age >= 2 × (Hello Time + 1
second).
Priority: This value is in the range of 0 to 65535, and is 32768 by default. This parameter is
used in STP and RSTP modes only.
BPDU Guard: Some ports are usually configured as edge ports to achieve rapid transition,
while they will become to non-edge ports automatically upon receiving configuration BPDUs,
which may cause spanning trees regeneration and network topology jitter.
Normally, no configuration BPDU will reach edge ports, but malicious users can attack a
network by sending configuration BPDUs deliberately to edge ports to cause network jitter,
which can be prevented by utilizing this BPDU protection function. With this function enabled
on a switch, the switch shuts down the edge ports that receive configuration BPDUs and then
reports the cases to the network administrator. After a port is shut down, only the
administrator can restore it.
By default, the BPDU protection function is disabled.
3.7.2 STP&RSTP
3.7.2.1 Ports Configuration
This page sets STP, Edge Port, P2P, Migration, Tx Hold Count, External Cost, Priority, and
Root Guard for each port.
Edge Port: selects Enabled to configure the specified Ethernet port as an edge port. By
default, all Ethernet ports are non-edge ports.
An edge port is such a port that is directly connected to a user terminal instead of another
switch or network segment. Rapid transition to the forwarding state is applied to edge ports,
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