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Configuring Switch Information 281
Learning
— The port is currently in the learning mode. The port cannot forward traffic
however it can learn new MAC addresses.
Forwarding
— The port is currently in the forwarding mode. The port can forward traffic and
learn new MAC addresses.
Role
—Indicates the port role assigned by the STP algorithm that provides STP paths. The possible
field values are:
Root—Provides the lowest cost path to forward packets to root switch.
Designated
—Indicates that the port via which the designated switch is attached to the LAN.
Alternate
—Provides an alternate path to the root switch from the root interface.
Backup
—Provides a backup path to the designated port path toward the Spanning Tree leaves.
Backup ports occur only when two ports are connected in a loop by a point-to-point link.
Backup ports also occur when a LAN has two or more connections connected to a shared segment.
Disabled
—Indicates the port is not participating in the Spanning Tree.
Speed
— Speed at which the port is operating.
Path Cost (1-200000000)
— The port contribution to the root path cost. The path cost is adjusted
to a higher or lower value, and is used to forward traffic when a path being rerouted.
Default Path Cost
— The default path cost. The default values for long path costs are:
Ethernet
- 2,000,000
Fast Ethernet
- 200,000
Gigabit Ethernet
- 20,000
The default values for short path costs are:
Ethernet
- 100
Fast Ethernet
- 19
Gigabit Ethernet
- 4
Priority (0-240, in steps of 16)
— Priority value of the port. The priority value influences the port
choice when a bridge has two ports connected in a loop. The priority value is between 0 -240. The
priority value is provided in increments of 16.
Designated Bridge ID
— The bridge priority and the MAC Address of the designated bridge.
Designated Port ID
— The designated port’s priority and interface.
Designated Cost
— Cost of the port participating in the STP topology. Ports with a lower cost are
less likely to be blocked if STP detects loops.
Forward Transmission
— Number of times the port has changed from the
Forwarding
state to
Blocking
.
LAG
— The LAG to which the port is attached.