Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 590

Changing the Region Name or Revision To change the region name or revision, use the following commands. • Change the region name. PROTOCOL MSTP mode name name • Change the region revision number. PROTOCOL MSTP mode revision number Example of the name Command To view the current region name and revision, use the show spanning-tree mst configuration command from EXEC Privilege mode. DellEMC(conf-mstp)#name my-mstp-region DellEMC(conf-mstp)#exit DellEMC(conf)#do show spanning-tree mst config MST region name: my-mstp-region Revision: 0 MSTI VID 1 100 2 200-300 Modifying Global Parameters The root bridge sets the values for forward-delay, hello-time, max-age, and max-hops and overwrites the values set on other MSTP bridges. • Forward-delay - the amount of time an interface waits in the Listening state and the Learning state before it transitions to the Forwarding state. • Hello-time - the time interval in which the bridge sends MSTP bridge protocol data units (BPDUs). • Max-age - the length of time the bridge maintains configuration information before it refreshes that information by recomputing the MST topology. • Max-hops - the maximum number of hops a BPDU can travel before a receiving switch discards it. NOTE: Dell EMC Networking recommends that only experienced network administrators change MSTP parameters. Poorly planned modification of MSTP parameters can negatively affect network performance. To change the MSTP parameters, use the following commands on the root bridge. 1 Change the forward-delay parameter. PROTOCOL MSTP mode forward-delay seconds The range is from 4 to 30. The default is 15 seconds. 2 Change the hello-time parameter. PROTOCOL MSTP mode hello-time seconds 590 Multiple Spanning Tree Protocol (MSTP)