3com 4500 50-PORT User Manual

C

HAPTER

 10: U

SING

 RSTP C

OMMANDS

not forward any packets (as if the link to it is disconnected). It will resume normal 
status if it receives no BPDU with higher-priority for a period of time.

To enable Root protection function on Ethernet1/0/1 of the Switch, enter the 
following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]interface Ethernet1/0/1

[4500-Ethernet1/0/1]stp root-protection

System View

number:

 Specifies the multiple of hello time, ranging from 3 to 7. 

Use the 

 command to configure the multiple of hello time 

for the Switch. 

Use the 

 command to restore the default multiple 

value. 

By default, the multiple is 3.

The Ethernet Switch transmits RSTP packets every hello time seconds. By default, if 
the Switch does not receive RSTP packets from the upstream Switch for 3 x hello 
time seconds, the Switch will decide the upstream Switch is dead and will 
recalculate the topology of the network. In a congested network, a system 
administrator may want to increase the timeout interval to prevent an unnecessary 
network topology change. This can be accomplished by using the timeout-factor 
command to set the multiplier to the desired value. The higher the multiplier the 
greater the timeout interval. It is recommended to set 5, 6 or 7 as the value of 
multiple in the steady network. 

To set the multiple value of hello time to 7, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]stp timeout-factor 7