Operation Manual

110
The following entries are displayed on this screen:

Global Config
STP:
Enable/Disable STP function globally on the switch.
Version: Select the desired STP version on the switch.
 STP: Spanning Tree Protocol.
 RSTP: Rapid Spanning Tree Protocol.

MSTP: Multiple Spanning Tree Protocol.

Parameters Config
CIST Priority:
Enter a value from 0 to 61440 to specify the priority of the switch for
com
parison in the CIST. CIST priority is an important criterion on
determining the root bridge. In the same condition, the switch with
the highest priority will be chosen as the root bridge. The lower
value has the higher priority. The default value is 32768 and should
be exact divisor of 4096.
Hello Time Enter a value from 1 to 10 in seconds to specify the interval to send
BPDU packets. It is used to test the links. 2*(Hello Time + 1) ≤ Max
Age. The default value is 2 seconds.
Max Age: Enter a value from 6 to 40 in seconds to specify the maximum time
the switch can wait without receiving a BPDU before attempting to
reconfigure. The default value is 20 seconds.
Forward Delay: Enter a value from 4 to 30 in seconds to specify the time for the port
to transit its state after the network topology is changed. 2*(Forward
Delay-1) ≥ Max Age. The default value is 15 seconds.
TxHoldCount: Enter a value from 1 to 20 to set the maximum number of BPDU
packets transmitted per Hello Time interval. The default value is
5pps.
Max Hops: Enter a value from 1 to 40 to set the maximum number of hops that
occur in a specific region before the BPDU is discarded. The default
value is 20 hops.
Note:
1. The forward delay parameter and the network diameter are correlated. A too small forward
delay parameter may result in temporary loops. A too large forward delay may cause a
network unable to resume the normal state in time. The default value is recommended.
2. An adequate hello time parameter can enable the switch to discover the link failures
occurred in the network without occupying too much network resources. A too large hello
time parameter may result in normal links being regarded as invalid when packets drop
occurred in the links, which in turn result in spanning tree being regenerated. A too small
hello time parameter may result in duplicated configuration being sent frequently, which