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228 CHAPTER 10: USING RSTP COMMANDS
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.
Example
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
stp timeout-factor Syntax
stp timeout-factor number
undo stp timeout-factor
View
System View
Parameter
number: Specifies the multiple of hello time, ranging from 3 to 7.
Description
Use the stp timeout-factor command to configure the multiple of hello time
for the Switch.
Use the undo stp timeout-factor 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.
Example
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
stp timer forward-delay Syntax
stp timer forward-delay centiseconds