Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 45)

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4.4.9.2.3 STP Port Settings
The example shows the screen for an 8-port switch. The screen for a 16- or 24-port
device would merely extend the panel to include all appropriate ports.
Admin Edge State
This option (set to Off by default) can be set On if the attached device falls outside the
RSTP tree. Such a device could be an operator work station or a server. In this case, the
port affected by the Admin Edge would be at the edge of RSTP administration. End nodes
cannot cause loops, so they can pass directly into the Forwarding state. Setting this value
to On provides several benefits :
• gives faster RSTP algorithm solution (convergence)
• reduces flooding needed for rebuilding address tables during reconfiguration
• eliminates an RSTP reconfiguration if the port changes state
• improves other RSTP-related timeout issues
Non STP State
By default, each port has this parameter set to Off so the port can participate in RSTP.
Setting this value to On will remove the port from RSTP, making the port immediately and
constantly available for packet switching — regardless of any RSTP-related activities.
(Figure 35, fifth panel)