Alcatel-Lucent 6850-48 参考指南

Distributed Spanning Tree Commands

OmniSwitch CLI Reference Guide

page 15-45

Configures the bridge forward delay time value for an individual VLAN instance. This value is the 
amount of time, in seconds, that determines how fast a port changes its Spanning Tree state until it reaches 
a forwarding state. The forward delay time specifies how long a port stays in the listening and learning 
states, which precede the forwarding state.

bridge 1x1 vid forward delay seconds

An existing VLAN ID number (1–4094).

Forward delay time in seconds (4–30).

By default, the bridge forward delay time value is set to 15 seconds.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• A low forward delay time can cause temporary loops in the network, because data may get forwarded 

before the reconfiguration message has reached all nodes on the network.

• The forward delay time is also used to age out all dynamic MAC address entries in the forwarding 

table (MAC address table) when a topology change occurs. 

• This command is an explicit Spanning Tree command that only applies to the specified VLAN instance 

regardless of which operating mode (flat or 1x1) is active on the switch.

• If the switch is running in the flat mode when this command is used, the specified max age time value 

is not active for the specified VLAN instance until the operating mode for the switch is changed to the 
1x1 mode.

• Note that when a configuration snapshot is taken of the switch, all Spanning Tree commands are saved 

in their explicit format. 

-> bridge mode flat

-> bridge 1x1 2 forward delay 30

-> bridge 1x1 10 forward delay 4

-> bridge mode 1x1

-> bridge 1x1 255 forward delay 25

-> bridge 1x1 455 forward delay 10

Release 6.1; command was introduced.