Nortel BayStack 450-24T Using Manual page 274

Using the BayStack 450 10/100/1000 Series Switch
Table 3-39. Spanning Tree Port Configuration Screen Fields
Field Description
Participation Allows you to configure any (or all) of the switch ports for spanning tree participation.
When an individual port is a trunk member (see Trunk field), changing this setting for one
of the trunk members changes the setting for all members of that trunk. You should
consider how this can change your network topology before you change this setting (see
"MultiLink Trunking Configuration Rules" on page 1-90).
The Fast Learning parameter is the same as Normal Learning, except that the state
transition timer is shortened to 2 seconds.
Default
Range
Priority This read-only field is a bridge spanning tree parameter that prioritizes the port's lowest
path cost to the root. When one or more ports have the same path cost, the STA selects
the path with the highest priority (lowest numerical value). See also Path Cost.
Default
Range
Path Cost This read-only field is a bridge spanning tree parameter that determines the lowest path
cost to the root.
Default
Range
State This read-only field indicates the current port state within the spanning tree network.
Each port can transition to various states, as determined by the Participation field setting.
For example, when the Participation field is set to Disabled, the port does not participate
in the STA and transitions to the Forwarding state (the default). When the Participation
field is set to Normal Learning or Fast Learning, the port transitions from the Disabled
state through the Blocking, Listening, and Learning states before entering the
Forwarding state.
Default
Range
3-114
Normal Learning
Normal Learning, Fast Learning, Disabled
128
0 to 255
10 or 100 (1 for gigabit port)
Path Cost = 1000/LAN speed (in Mb/s)
The higher the LAN speed, the lower the path cost.
See also Priority.
1 to 65535
Topology dependent
Disabled, Blocking, Listening, Learning, Forwarding
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