Users Guide

442 Dell PowerConnect 55xx Systems User Guide
– LAG State — Displays the current STP state of the 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 — The LAG does not learn MAC
addresses and does 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 — Displays the LAG role assigned by the STP algorithm that
provides STP paths. The possible options are:
•
Root — This LAG provides the lowest cost path to forward
packets to root switch.
•
Designated — This LAG is the interface through which the
bridge is connected to the LAN, which provides the lowest cost
path from the LAN to the Root Bridge.
•
Alternate — This LAG provides an alternate LAG to the root
switch from the root interface.
•
Backup — This LAG provides a backup path to the designated
port. 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 — This LAG is not participating in the Spanning Tree.