Gigabit Ethernet Switch User's Manual

WGS3 Layer 3 Switch User’s Manual
- 51 -
Parameter Default Description
Type Shows port type as:
100TX : 10BASE-T / 100BASE-TX
1000T : 1000BASE-T
1000FX: 1000Base-SX or 1000Base-LX
Priority 128 Defines the priority for the use of a port in the STA algorithm. If the path
cost for all ports on a switch are the same, the port with the highest
priority (that is, lowest value) will be configured as an active link in the
Spanning Tree. Where more than one port is assigned the highest
priority, the port with lowest numeric identifier will be enabled. The range
is 0 - 255.
(Path) Cost 100/19/4 This parameter is used by the STA algorithm 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.)
The default and recommended range is:
Ethernet: 100 (50~600)
Fast Ethernet: 19 (10~60)
Gigabit Ethernet: 4 (3~10)
The full range is 0 - 65535.
Fast
Forwarding
Disabled This parameter is used to enable/disabled the Fast Spanning Tree mode
for the selected port. In this mode, ports skip the Blocked, Listening and
Learning states and proceed straight to Forwarding.
NOTE: Since end-nodes cannot cause forwarding loops, they can pass through the Spanning Tree
state changes more quickly than allowed by standard convergence time. Fast Forwarding can
achieve quicker convergence for end-node workstations and servers, and also overcome other
STA related time-out problems. (Remember that Fast Forwarding should only be enabled for
ports connected to an end-node device.)