Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 707

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. Dell(conf-mstp)#name my-mstp-region Dell(conf-mstp)#exit Dell(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. Dell#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 Influencing MSTP Root Selection MSTP determines the root bridge, but you can assign one bridge a lower priority to increase the probability that it becomes the root bridge. To change the bridge priority, use the following command. • Assign a number as the bridge priority. PROTOCOL MSTP mode Multiple Spanning Tree Protocol (MSTP) 707