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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
166
• Priority
Defines the priority used for this port in the Spanning Tree Protocol.
If the path cost for all ports on a switch are the same, the port with the highest
priority (i.e., lowest value) will be configured as an active link in the Spanning
Tree. This makes a port with higher priority less likely to be blocked if the
Spanning Tree Protocol is detecting network loops. Where more than one port is
assigned the highest priority, the port with lowest numeric identifier will be
enabled.
Default: 128
Range: 0-240, in steps of 16
• Admin Path Cost
This parameter is used by the STA to determine the best path between devices.
Therefore, lower values should be assigned to ports attached to faster media,
and higher values assigned to ports with slower media. (Path cost takes
precedence over port priority.)
(Range: 0 for auto-configuration, 1-65535 for the short path cost method11,
1-200,000,000 for the long path cost method)
• Admin Link Type
The link type attached to this interface.
• Point-to-Point – A connection to exactly one other bridge.
• Shared – A connection to two or more bridges.
• Auto – The switch automatically determines if the interface is attached to a
point-to-point link or to shared media.
Default setting: Auto
• Admin Edge Port (Fast
Forwarding)
You can enable this option if an interface is attached to a LAN segment that is at
the end of a bridged LAN or to an end node. Since end nodes cannot cause
forwarding loops, they can pass directly through to the spanning tree forwarding
state. Specifying Edge Ports provides quicker convergence for devices such as
workstations or servers, retains the current forwarding database to reduce the
amount of frame flooding required to rebuild address tables during
reconfiguration events, does not cause the spanning tree to initiate
reconfiguration when the interface changes state, and also overcomes other
STA-related timeout problems. However, remember that Edge Port should only
be enabled for ports connected to an end-node device.
(Default: Disabled)
• Migration
If at any time the switch detects STP BPDUs, including Configuration or Topology
Change Notification BPDUs, it will automatically set the selected interface to
forced STP-compatible mode. However, you can also use the Protocol Migration
button to manually re-check the appropriate BPDU format (RSTP or
STP-compatible) to send on the selected interfaces.
(Default: Disabled)