Cisco Systems 200 Manual De Usuario
Spanning Tree
Defining Spanning Tree Interface Settings
197
Cisco Small Business 200 Series Smart Switch Administration Guide
13
Defining Spanning Tree Interface Settings
The STP Interface Settings page enables you to configure STP on a per-port
basis, and to view the information learned by the protocol, such as the designated
bridge.
basis, and to view the information learned by the protocol, such as the designated
bridge.
The defined configuration entered is valid for all flavors of the STP protocol.
To configure STP on an interface:
STEP 1
Click Spanning Tree > STP Interface Settings.
STEP 2
Select an interface and click Edit.
STEP 3
Enter the parameters
•
Interface—Select the Port or LAG on which Spanning Tree is configured.
•
STP—Enables or disables STP on the port.
•
Edge Port—Enables or disables Fast Link on the port. If Fast Link mode is
enabled on a port, the port is automatically set to Forwarding state when
the port link is up. Fast Link optimizes the STP protocol convergence. The
options are:
enabled on a port, the port is automatically set to Forwarding state when
the port link is up. Fast Link optimizes the STP protocol convergence. The
options are:
-
Enable—Enables Fast Link immediately.
-
Auto—Enables Fast Link a few seconds after the interface becomes
active. This allows STP to resolve loops before enabling Fast Link.
active. This allows STP to resolve loops before enabling Fast Link.
-
Disable—Disables Fast Link.
NOTE
It is recommended to set the value to Auto so that the device sets
the port to fast link mode if a host is connected to it, or sets it as a regular
STP port if connected to another device. This helps avoid loops.
STP port if connected to another device. This helps avoid loops.
•
Root Guard—Enables or disables Root Guard on the device. The Root
Guard option provides a way to enforce the root bridge placement in the
network.
Guard option provides a way to enforce the root bridge placement in the
network.
Root Guard ensures that the port on which this feature is enabled is the
designated port. Normally, all root bridge ports are designated ports, unless
two or more ports of the root bridge are connected. If the bridge receives
superior BPDUs on a Root Guard-enabled port, Root Guard moves this port
to a root-inconsistent STP state. This root-inconsistent state is effectively
equal to a listening state. No traffic is forwarded across this port. In this way,
Root Guard enforces the position of the root bridge.
designated port. Normally, all root bridge ports are designated ports, unless
two or more ports of the root bridge are connected. If the bridge receives
superior BPDUs on a Root Guard-enabled port, Root Guard moves this port
to a root-inconsistent STP state. This root-inconsistent state is effectively
equal to a listening state. No traffic is forwarded across this port. In this way,
Root Guard enforces the position of the root bridge.