Users Guide

204 Network Administration: Spanning Tree and LAG
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\User
Guide\Dell_Astute_Network_Admin_STP.fm
DELL CONFIDENTIAL – PRELIMINARY 8/9/16 - FOR PROOF ONLY
• 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 the root bridge.
•
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 path to the root
bridge from the root port.
•
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.
–
Path Cost — Enter the 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.
–
Use Default — Check to cause the device to use the default path cost.
These are set in Global Settings.
–
Priority — Select the priority value of the LAG. The priority value
influences the LAG choice when a bridge has looped ports. The
priority value is given in steps of 16.