Dell Force10 S4820T S4820T Configuration Guide - Page 664

www.dell.com | support.dell.com For a bridge to be in the same MSTP region as another, all three of these qualities must match exactly. The default values for name and revision will match on all Dell Force10 FTOS equipment. If you have non-FTOS equipment that will participate in MSTP, ensure these values to match on all the equipment. Note: Some non-FTOS equipment may implement a non-null default region name. SFTOS, for example, uses the Bridge ID, while others may use a MAC address. To change the region name or revision: Task Change the region name. Change the region revision number. • Range: 0 to 65535 • Default: 0 Command Syntax name name revision number Command Mode PROTOCOL MSTP PROTOCOL MSTP View the current region name and revision using the command show spanning-tree mst configuration from EXEC Privilege mode, as shown in Figure 31-6. Figure 31-6. Viewing the MSTP Region Name and Revision FTOS(conf-mstp)#name my-mstp-region FTOS(conf-mstp)#exit FTOS(conf)#do show spanning-tree mst config MST region name: my-mstp-region Revision: 0 MSTI VID 1 100 2 200-300 Modify 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 is the amount of time an interface waits in the Listening State and the Learning State before it transitions to the Forwarding State. • Hello-time is the time interval in which the bridge sends MSTP Bridge Protocol Data Units (BPDUs). • Max-age is the length of time the bridge maintains configuration information before it refreshes that information by recomputing the MST topology. • Max-hops is the maximum number of hops a BPDU can travel before a receiving switch discards it. Note: Dell Force10 recommends that only experienced network administrators change MSTP parameters. Poorly planned modification of MSTP parameters can negatively impact network performance. 664 | Multiple Spanning Tree Protocol (MSTP)