3Com 5500G-EI Command Reference Guide - Page 332

336 CHAPTER 10: USING RSTP COMMANDS 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 unnessary network topology change. This can be accomplished by using the timeout-factor command to set the multipler to the desired value. The higher the multipler 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: system-view System View: return to User View with Ctrl+Z. [SW5500]stp timeout-factor 7 stp timer forward-delay Syntax stp timer forward-delay centiseconds undo stp timer forward-delay View System View Parameter centiseconds: Specifies the time of forward delay in centisecond, ranging from 400 to 3000. By default, the value is 1500 centiseconds. Description Use the stp timer forward-delay command to configure the time of forward delay for the Switch.