Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 343

To change the bridge priority, use the following command: Task Assign a number as the bridge priority. A lower number increases the probability that the bridge becomes the root bridge. Range: 0 to 61440, in increments of 4096 Default: 32768 Command Syntax Command Mode msti instance bridge-priority priority PROTOCOL MSTP The simple configuration (Figure 19-1) by default yields the same forwarding path for both MSTIs. Figure 19-5 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 (Figure 19-5). Figure 19-5. Changing the Bridge Priority FTOS(conf-mstp)#msti 2 bridge-priority 0 FTOS(conf-mstp)#show config ! protocol spanning-tree mstp MSTI 2 bridge-priority 0 FTOS(conf-mstp)# Interoperate with Non-FTOS Bridges FTOS 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 FTOS is null. • Revision is a two-byte number. The default revision number on FTOS 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 matches on all Dell Force10 FTOS equipment. If you have non-FTOS equipment that participates in MSTP, ensure these values to match on all the equipment. Note: Some non-FTOS equipment may implement a non-null default region name. SFTOS, for example, uses the Bridge ID, while others may use a MAC address. Multiple Spanning Tree Protocol (MSTP) | 341