AirLive SNMP-FSH2602MG v2 - Manual (Page 49)

4. Web Management in SNMP-FSH2602MG v2
AirLive SNMP-FSH2602MG v2 User’s Manual 44
treat the root bridge malfunctioned and issue a Topology Change Notification
(TCN) BPDU to all other bridges. All bridges in the LAN will re-calculate and
determine who the root bridge is. The valid value is from 6 to 40 seconds. The
default is 20 seconds.
„ Hello Time: The time that how long a switch sends BPDU packet to other bridge
checks STP current status. The valid value is from 1 to 10 seconds. The default is
2 seconds.
„ Forward Delay Time: The forward delay time is defined as the time spent from
Listening state moved to Learning state and also from Learning state moved to
Forwarding state of a port in bridge. The forward delay time contains two states,
Listening state to Learning state and Learning state to Forwarding state. It
assumes that forward delay time is 15 seconds, and total forward delay time will
be 30 seconds. This has much to do with the STP convergent time which will be
more than 30 seconds because some other factors. The valid value is from 4 to 30
seconds. The default is 45 seconds.
Note:
(1) Priority must be a multiple of 4096.
(2) 2 x (Forward Delay Time-1) should be greater than or equal to Max Age.
(3) Max Age should be greater than or equal to 2 x (Hello Time + 1).