Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 214

• Change the region revision number in MULTIPLE-SPANNING-TREE mode (0 to 65535, default 0). revision number Configure and verify region name OS10(conf-mstp)# name my-mstp-region OS10(conf-mstp)# do show spanning-tree mst config MST region name: my-mstp-region Revision: 0 MSTI VID 1 100 2 200-300 Modify parameters The root bridge sets the values for forward-delay, hello-time, max-age, and max-hops and overwrites the values set on other MST bridges. Forward-time Time an interface waits in the Discarding state and Learning state before it transitions to the Forwarding state. Hello-time Interval in which the bridge sends MST BPDUs. Max-age Length of time the bridge maintains configuration information before it refreshes that information by recomputing the MST topology. Max-hops Maximum number of hops a BPDU travels before a receiving device discards it. Dell EMC recommends that only experienced network administrators change MST parameters. Poorly planned modification of the MST parameters can negatively affect network performance. 1 Change the forward-time parameter in CONFIGURATION mode (4 to 30, default 15). spanning-tree mst forward-time seconds 2 Change the hello-time parameter in CONFIGURATION mode (1 to 10, default 2). Dell EMC recommends increasing the hello-time for large configurations (especially configurations with more ports). spanning-tree mst hello-time seconds 3 Change the max-age parameter in CONFIGURATION mode (6 to 40, default 20). spanning-tree mst max-age seconds 4 Change the max-hops parameter in CONFIGURATION mode (1 to 40, default 20). spanning-tree mst max-hops number MST configuration OS10(config)# spanning-tree mst OS10(config)# spanning-tree mst forward-time 16 OS10(config)# spanning-tree mst hello-time 5 OS10(config)# spanning-tree mst max-age 10 OS10(config)# spanning-tree mst max-hops 30 View MSTP parameter values OS10# show spanning-tree active Spanning tree enabled protocol msti with force-version mst MSTI 0 VLANs mapped 1,31-4093 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32768, Address 3417.4455.667f Root Bridge hello time 2, max age 20, forward delay 15, max hops 20 Bridge ID Priority 32768, Address 90b1.1cf4.a523 Configured hello time 10, max age 40, forward delay 30, max hops 40 CIST regional root ID Priority 32768, Address 90b1.1cf4.a523 CIST external path cost 500 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/5 128.276 128 500 FWD 0 32768 3417.4455.667f 128.146 214 Layer 2