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Configuring Switch Information 337
•
Root Guard
—
Prevents devices outside the network core from being assigned the spanning tree root.
–
Checked
— Root guard is enabled on the port.
–
Unchecked
— Root guard is disabled on the port.
•
LAG State
— Current STP state of a LAG. If enabled, the LAG state determines what forwarding
action is taken on traffic. If the bridge discovers a malfunctioning LAG, the LAG is placed in the
Broken
state. Possible LAG states are:
–
Disabled
— STP is currently disabled on the LAG. The LAG forwards traffic while learning
MAC addresses.
–
Blocking
— The LAG is blocked and cannot be used to forward traffic or learn MAC addresses.
–
RSTP Discarding State
— In this state the port does not learn MAC addresses and do not forward
frames.
– This state is union of Blocking, and Listening state introduced in STP (802.1.D).
–
Listening
— The LAG is in the listening mode and cannot forward traffic or learn MAC addresses.
–
Learning
— The LAG is in the learning mode and cannot forward traffic, but it can learn new
MAC addresses.
–
Forwarding
— The LAG is currently in the forwarding mode, and it can forward traffic and learn
new MAC addresses.
–
Broken
— The LAG is currently malfunctioning and cannot be used for forwarding traffic.
•
Role
— Indicates the LAG 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 via which the designated switch is attached to the LAN.
–
Alternate
— Provides an alternate LAG 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 LAG is not participating in the Spanning Tree.
•
Path Cost (1-200000000)
— Amount the LAG contributes 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 is being rerouted.
The path cost has a value of 1 to 200000000.
•
Default Path Cost
— Indicates if the device uses the default path cost. The possible field values are:
–
Checked
— Device uses the default path cost.
–
Unchecked
— Device uses path cost defined in the Path Cost field above.
•
Priority
— Priority value of the LAG. The priority value influences the LAG choice when a bridge has
looped ports. The priority value is between 0-240, in steps of 16.
•
Designated Bridge ID
— The priority and the MAC Address of the designated bridge.