Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 3 Bridge Configuration Commands
3Com Corporation
3-10
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:
z On a spanning tree, all bridges must use the Hello Time timer of the root bridge
instead of their own.
z 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.
Example
# Set the Hello Time timer on the bridge to 5 seconds.
[Router] bridge stp timer hello 5
3.1.14 bridge-set
Syntax
bridge-set bridge-set
undo bridge-set bridge-set
View
Interface view
Parameter
bridge-set: Bridge set number; an integer in the range 1 to 255.
Description
Use the bridge set command to add an interface to a bridge set.
Use the undo bridge set command to delete the interface from the bridge set.
By default, no interface is added to the bridge set.
Bridging can only be implemented between interfaces of a same bridge set.
When configuring bridge over dial interface, you need to configure this command on
the top-layer dial interface.
Example
# Add Ethernet0/0/0 to bridge set 1.
[3Com] interface ethernet0/0/0
[3Com-Ethernet0/0/0] bridge-set 1