Dell(conf-mstp)#msti 2 vlan 200-300Dell(conf-mstp)#show config!protocol spanning-tree mstpno disableMSTI 1 VLAN 100MSTI 2 VLAN 200-300All bridges in the MSTP region must have the same VLAN-to-instance mapping.To view which instance a VLAN is mapped to, use the show spanning-tree mst vlan command from EXEC Privilege mode.Dell(conf-mstp)#name my-mstp-regionDell(conf-mstp)#exitDell(conf)#do show spanning-tree mst configMST region name: my-mstp-regionRevision: 0MSTI VID1 1002 200-300To view the forwarding/discarding state of the ports participating in an MSTI, use the show spanning-tree msti commandfrom EXEC Privilege mode.Dell#show spanning-tree msti 1MSTI 1 VLANs mapped 100Root Identifier has priority 32768, Address 0001.e806.953eRoot Bridge hello time 2, max age 20, forward delay 15, max hops 19Bridge Identifier has priority 32768, Address 0001.e80d.b6d6Configured hello time 2, max age 20, forward delay 15, max hops 20Current root has priority 32768, Address 0001.e806.953eNumber of topology changes 2, last change occured 1d2h ago on Te 1/21Port 374 (TenGigabitEthernet 1/21) is root ForwardingPort path cost 20000, Port priority 128, Port Identifier 128.374Designated root has priority 32768, address 0001.e806.953eDesignated bridge has priority 32768, address 0001.e806.953eDesignated port id is 128.374, designated path cost 20000Number of transitions to forwarding state 1BPDU (MRecords): sent 93671, received 46843The port is not in the Edge port modePort 384 (TenGigabitEthernet 1/31) is alternate DiscardingPort path cost 20000, Port priority 128, Port Identifier 128.384Designated root has priority 32768, address 0001.e806.953eDesignated bridge has priority 32768, address 0001.e809.c24aDesignated port id is 128.384, designated path cost 20000Number of transitions to forwarding state 1BPDU (MRecords): sent 39291, received 7547The port is not in the Edge port modeInfluencing MSTP Root SelectionMSTP determines the root bridge, but you can assign one bridge a lower priority to increase the probability that it becomes the rootbridge.To change the bridge priority, use the following command.• Assign a number as the bridge priority.PROTOCOL MSTP modemsti instance bridge-priority priorityA lower number increases the probability that the bridge becomes the root bridge.Multiple Spanning Tree Protocol (MSTP) 455
