Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 588
Creating Multiple Spanning Tree Instances
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• spanning-tree 0 To remove an interface from the MSTP topology, use the no spanning-tree 0 command. Creating Multiple Spanning Tree Instances To create multiple spanning tree instances, use the following command. A single MSTI provides no more benefit than RSTP. To take full advantage of MSTP, create multiple MSTIs and map VLANs to them. • Create an MSTI. PROTOCOL MSTP mode msti Specify the keyword vlan then the VLANs that you want to participate in the MSTI. Examples of Configuring and Viewing MSTI The following examples shows the msti command. DellEMC(conf)#protocol spanning-tree mstp DellEMC(conf-mstp)#msti 1 vlan 100 DellEMC(conf-mstp)#msti 2 vlan 200-300 DellEMC(conf-mstp)#show config ! protocol spanning-tree mstp no disable MSTI 1 VLAN 100 MSTI 2 VLAN 200-300 All 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. 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 To view the forwarding/discarding state of the ports participating in an MSTI, use the show spanning-tree msti command from EXEC Privilege mode. DellEMC#show spanning-tree msti 1 MSTI 1 VLANs mapped 100 Root Identifier has priority 32768, Address 0001.e806.953e Root Bridge hello time 2, max age 20, forward delay 15, max hops 19 Bridge Identifier has priority 32768, Address 0001.e80d.b6d6 Configured hello time 2, max age 20, forward delay 15, max hops 20 Current root has priority 32768, Address 0001.e806.953e Number of topology changes 2, last change occured 1d2h ago on Te 1/21 Port 374 (TenGigabitEthernet 1/21) is root Forwarding Port path cost 20000, Port priority 128, Port Identifier 128.374 Designated root has priority 32768, address 0001.e806.953e Designated bridge has priority 32768, address 0001.e806.953e Designated port id is 128.374, designated path cost 20000 Number of transitions to forwarding state 1 BPDU (MRecords): sent 93671, received 46843 The port is not in the Edge port mode Port 384 (TenGigabitEthernet 1/31) is alternate Discarding 588 Multiple Spanning Tree Protocol (MSTP)
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