Command Reference Guide

28 ● bridge stp timer hello 3Com Router 5000 Family and Router 6000 Family
Command Reference
bridge stp timer hello
Purpose Use the bridge stp timer hello command to set the Hello Time timer on the
bridge.
Use the undo bridge stp timer hello command to restore the default.
Syntax bridge stp timer hello seconds
undo bridge stp timer hello
Parameters seconds
Value for the Hello Time timer on the bridge (in
seconds). Valid values are 1 to 10.
If no value is specified, the default value is 2 seconds.
Example Set the Hello Time timer on the bridge to 5 seconds.
[Router] bridge stp timer hello 5
View This command can be used in the following views:
■ System view
Description A Hello Time timer is used to control the interval for sending BPDUs. Enabling STP on
a port starts a Hello Time timer. An appropriately set Hello Time timer allows the
bridge to discover link faults on the network without occupying many resources.
When configuring a Hello Time timer, consider the following:
■ On a spanning tree, all bridges must use the Hello Time timer of the root bridge
instead of their own.
■ Set the Hello Time timer appropriately. A small Hello time timer may increase the
frequency of BPDU sending, increasing undesired CPU load. A large Hello Time
timer, on the contrary, may cause the bridge to take a frame loss for a link failure,
and then to recalculate the spanning tree. You are recommended to use the
default timer setting if possible.