Specifications

Waters Network Systems User’s Manual Page 71
PS-2126M-POE
will treat the root bridge as malfunctioning and issue a Topology Change Notification (TCN)
BPDU to all other bridges. All bridges in the LAN will re-calculate to determine who the root
bridge is. The valid value of Max. Age is 6 ~ 40 seconds. Default is 20 seconds.
Forward Delay:
You can set the root bridge forward delay time. This figure is set by the root bridge only. 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, then total forward delay time will be 30
seconds.
The valid value is 4 ~ 30 seconds, default is 15 seconds.
Force Version:
Two options are offered for the STP algorithm. One is RSTP and the other is STP. If STP is
chosen, RSTP will run as a legacy STP. The switch supports RSTP (802.1w) which is backward
compatible with STP (802.1d).
Figure 5.37 – STP Configuration
5.16.3 STP Port Configuration
Function name:
STP Port Setting
Function description:
In the STP Port Setting, one item selection and five parameters are available for setup. You can
disable and enable each port. You can set “Path Cost” and “Priority” for each port and set “Admin
Edge Port” and “Admin Point To Point”.
Parameter description:
Port Status:
Displays the current state of a port for viewing only. There are three possible states. ( according
to 802.1w specification)
 DISCARDING state indicates that this port can neither forward packets nor contribute