Configuring Spanning Tree
Defining Spanning Tree
Cisco Small Business SFE/SGE Managed Switches Administration Guide 262
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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.
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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.
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Rapid STP
— 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 LAG. 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.
-
Forwarding
— Indicates that the port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
• Point-to-Point Admin Status — Indicates whether a point-to-point link is
established on the port. Ports defined as Full Duplex are considered Point-to-
Point port links. The possible field values are:
-
Enable
— Device establishes point-to-point, full duplex links.
-
Disable
— Device establishes shared, half duplex links.
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