H3C S3100-52P Command Manual

Also see for S3100-52P: Operation manual Operation manual Operation manual Operation manual Operation manual

Contents

Command Manual – MSTPH3C S3100-52P Ethernet Switches Chapter 1 MSTP Configuration Commands1-47As for the configuration of the three time-related parameters (namely, the hello time,forward delay, and max age parameters), the following formulas must be met to preventfrequent network jitter.2 × (forward delay – 1 second) >= max ageMax age >= 2 × (hello time + 1 second)You are recommended to specify the network diameter of the switched network and thehello time by using the stp root primary or stp root secondary command. After that,the three proper time-related parameters are automatically calculated by MSTP.Related command: stp timer forward-delay, stp timer max-age, and stpbridge-diameter.Example# Set the hello time to 400 centiseconds. system-viewSystem View: return to User View with Ctrl+Z.[H3C] stp timer hello 4001.1.44 stp timer max-ageSyntaxstp timer max-age centi-secondsundo stp timer max-ageViewSystem viewParametercenti-seconds: Max age in centiseconds to be set. This argument ranges from 600 to4,000 and defaults to 2,000.DescriptionUse the stp timer max-age command to set the max age of the switch.Use the undo stp timer max-age command to restore the max age to the defaultvalue.MSTP is capable of detecting link failures and automatically restoring redundant links tothe forwarding state. In CIST, switches use the max age parameter to judge whether ornot a received configuration BPDU times out. Spanning trees will be recalculated if aconfiguration BPDU received by a port times out.The max age is meaningless to MSTIs. The max age configured for the root bridge ofthe CIST applies to all switches operating on the CIST, including the root bridge.