Alcatel-Lucent 6850-48 参考指南

Distributed Spanning Tree Commands

OmniSwitch CLI Reference Guide

page 15-31

Configures the bridge hello time value for the flat mode Common and Internal Spanning Tree (CIST) 
instance. This value is the amount of time, in seconds, between each transmission of a BPDU on any port 
that is the Spanning Tree root or is attempting to become the Spanning Tree root.

bridge cist hello time seconds

Hello time value in seconds (1–10).

By default, the bridge hello time value is set to 2 seconds.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• Lowering the Hello Time interval improves the robustness of the Spanning Tree Algorithm. Increasing 

the Hello Time interval lowers the overhead of the Spanning Tree Algorithm.

• This command is an explicit Spanning Tree command that only applies to the CIST instance regard-

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

• If the switch is running in 1x1 mode when this command is used, the specified hello time value is not 

active for the CIST instance until the operating mode for the switch is changed to the flat 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 cist hello time 5

-> bridge cist hello time 10

-> bridge mode 1x1

-> bridge cist hello time 5

-> bridge cist hello time 10

Release 6.1; command was introduced.