Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 708

msti instance bridge-priority priority A 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 Priority By 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 different root 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 0 1d2h51m: %SYSTEM-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: MSTP root changed for instance 2. My Bridge ID: 0:0001.e809.c24a Old Root: 32768:0001.e806.953e New Root: 0:0001.e809.c24a R3(conf-mstp)#show config ! protocol spanning-tree mstp no disable MSTI 1 VLAN 100 MSTI 2 VLAN 200,300 MSTI 2 bridge-priority 0 Interoperate with Non-Dell Bridges The Dell 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 is null. • Revision is a 2-byte number. The default revision number 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 the name and revision number must match on all Dell Networking OS devices. If there are non-Dell devices that participate in MSTP, ensure that these values match on all devices. NOTE: Some non-Dell equipment may implement a non-null default region name, such as the Bridge ID or a MAC address. Multiple Spanning Tree Protocol (MSTP) 708