Cisco ESW 500 Administration Manual page 288

Configuring Spanning Tree
Defining Rapid Spanning Tree
ESW 500 Series Switches Administration Guide
•
Role — Indicates the port role assigned by the STP algorithm in order to
provide to STP paths. The possible field values are:
-
Root
— Provides the lowest cost path to forward packets to root switch.
-
Designated
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.
-
Disable
— Indicates the port is not participating in the Spanning Tree.
•
Mode — Indicates the current Spanning Tree mode. The possible field values
are:
-
STP
— Indicates that Classic STP is enabled on the port.
-
RSTP
— Indicates that Rapid STP is enabled on the port.
•
Fast Link Operational Status— Indicates if Fast Link is enabled or disabled for
the port or EtherChannel. If Fast Link is enabled for a port, the port is
automatically placed in the forwarding state.
-
Enable — Fast Link is enabled.
-
Disable
— Fast Link is disabled.
-
Auto
— Fast Link mode is enabled a few seconds after the interface
becomes active.
•
Port State — Indicates the RSTP status on the specific port. The possible field
values are:
-
Disabled — Indicates that STP is currently disabled on the port.
-
Blocking
— Indicates that the port is currently blocked and cannot
forward traffic or learn MAC addresses.
-
Listening
— Indicates that the port is in Listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
-
Learning
— Indicates that the port is in Learning mode. The port cannot
forward traffic, however it can learn new MAC addresses.
— Indicates that the port or EtherChannel via which the
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