BPDU (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 theprobability that it becomes the root bridge.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.The range is from 0 to 61440, in increments of 4096.The default is 32768.Example of Assigning and Verifying the Root Bridge PriorityBy default, the simple configuration shown previously yields the same forwarding path for both MSTIs.The following example shows how R3 is assigned bridge priority 0 for MSTI 2, which elects a differentroot bridge than MSTI 2.To view the bridge priority, use the show config command from PROTOCOL MSTP mode.R3(conf-mstp)#msti 2 bridge-priority 01d2h51m: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: MSTP root changed for instance2. MyBridge ID: 0:0001.e809.c24a Old Root: 32768:0001.e806.953e New Root:0:0001.e809.c24aR3(conf-mstp)#show config!protocol spanning-tree mstpno disableMSTI 1 VLAN 100MSTI 2 VLAN 200,300MSTI 2 bridge-priority 0Interoperate with Non-Dell Networking OS BridgesDell Networking OS supports only one MSTP region.A region is a combination of three unique qualities:• Name is a mnemonic string you assign to the region. The default region name on Dell Networking OSis null.• Revision is a 2-byte number. The default revision number on Dell Networking OS is 0.• VLAN-to-instance mapping is the placement of a VLAN in an MSTI.For a bridge to be in the same MSTP region as another, all three of these qualities must match exactly.The default values for name and revision match on all Dell Networking OS equipment. If you have non-Multiple Spanning Tree Protocol (MSTP) 521
