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DGS-6600 Series Switch m spanning-tree fast-forwarding

CLI Reference Guide

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spanning-tree fast-forwarding

To enable fast forwarding mode, use the spanning-tree fast-forwarding

command. When fast forwarding is enabled the interface will be immediately put

into the forwarding state upon linkup without waiting for the timer to expire.

spanning-tree fast-forwarding

no spanning-tree fast-forwarding

Syntax None.

Default Default fast forwarding is automatically derived from an IEEE Std 802.1D-2004

Bridge Detection state machine.

Command Mode Interface configuration.

Usage Guideline Use this command only with interfaces that connect to end stations; otherwise,

an accidental topology loop could cause a data-packet loop and disrupt the

switch and network operations.

During linkup, when an interface, with fast-forwarding mode enabled, is moved

directly to the spanning-tree forwarding state, then it is not necessary to wait for

the standard forward-time delay.

This command has two states:

• spanning-tree fast-forwarding -This command enables fast forwarding

state unconditionally on the given port.

• no spanning-tree fast-forwarding -The fast-forwarding state for the given

port is returned to the default settings.

This configuration will take effect on all the spanning-tree modes. Both the

physical port and the port-channel interfaces are valid for this command.

Example This example shows how to configure the fast-forwarding state at eth1.7.

Verify the settings by entering the show spanning-tree interface command.

Switch(config)#interface eth1.7

Switch(config-if)#spanning-tree fast-forwarding