Dell Configuration Guide for the S4048–ON System 9.14.2.6

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
Port path cost 20000, Port priority 128, Port Identifier 128.384
Designated root has priority 32768, address 0001.e806.953e
Designated bridge has priority 32768, address 0001.e809.c24a
Designated port id is 128.384, designated path cost 20000
Number of transitions to forwarding state 1
BPDU (MRecords): sent 39291, received 7547
The port is not in the Edge port mode