•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
–Disabled — Indicates the LAG is not participating in the Spanning Tree.
•Path Cost
•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
•Designated Bridge ID — The priority and the MAC Address of the designated bridge.
