Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 342

www.dell.com | support.dell.com Figure 19-3. Mapping VLANs to MSTI Instances FTOS(conf)#protocol spanning-tree mstp FTOS(conf-mstp)#msti 1 vlan 100 FTOS(conf-mstp)#msti 2 vlan 200-300 FTOS(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, use the show spanning-tree mst vlan command from EXEC Privilege mode. To view the forwarding/discarding state of the ports participating in an MSTI, use the show spanning-tree msti command from EXEC Privilege mode (Figure 19-4). Figure 19-4. Viewing MSTP Port States FTOS#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 TenGig 1/21 Port 374 (TenGigabitEthernet 1/21) is root Forwarding Port path cost 2000, 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 2000 Number of transitions to forwarding state 1 BPDU (MRecords): sent 93671, received 46843 The port isnot in the Edge port mode, bpdu filter is disabled Port 384 (TenGigabitEthernet 1/31) is alternate Discarding Port path cost 2000, 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 2000 Number of transitions to forwarding state 1 BPDU (MRecords): sent 39291, received 7547 The port isnot in the Edge port mode, bpdu filter is disabled Influence MSTP Root Selection MSTP determines the root bridge, but you can assign one bridge a lower priority to increase the probability of it becoming the root bridge. 340 | Multiple Spanning Tree Protocol (MSTP)