Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 213
Root selection, Non-Dell hardware, Region name or revision
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ethernet1/1/9 Disb 128.292 128 200000000 BLK 0 AUTO No ethernet1/1/10 Disb 128.296 128 200000000 BLK Root selection MSTP determines the root bridge according to the lowest bridge ID. Assign a lower bridge priority to increase its likelihood of becoming the root bridge. • Assign a bridge priority number to a specific instance in CONFIGURATION mode (0 to 61440 in increments of 4096, default 32768). Use a lower priority number to increase the likelihood of the bridge to become a root bridge. spanning-tree mst instance-number priority priority Assign root bridge priority OS10(config)# spanning-tree mst 0 Verify root bridge priority OS10# show spanning-tree active Spanning tree enabled protocol msti with force-version mst MSTI 0 VLANs mapped 1,31-4093 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32768, Address 3417.4455.667f Root Bridge hello time 2, max age 20, forward delay 15, max hops 20 Bridge ID Priority 32768, Address 90b1.1cf4.a523 Configured hello time 2, max age 20, forward delay 15, max hops 20 CIST regional root ID Priority 32768, Address 90b1.1cf4.a523 CIST external path cost 500 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/5 128.276 128 500 FWD 0 32768 3417.4455.667f 128.146 ethernet1/1/6 128.280 128 500 BLK 0 32768 3417.4455.667f 128.150 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ethernet1/1/5 Root 128.276 128 500 FWD 0 AUTO No ethernet1/1/6 Altr 128.280 128 500 BLK 0 AUTO No Non-Dell hardware OS10 supports only one MST region. For a bridge to be in the same MST region as another, the three unique attributes (name, revision, and VLAN-to-instance-mapping) must match. The default values for name and revision number match on all Dell hardware. If you have non-Dell hardware that participates in MST, ensure these values match on all devices. A region is a combination of three unique attributes: • Name - A mnemonic string you assign to the region (default is the system MAC address). • Revision - A 2-byte number (default is 0). • VLAN-to-instance mapping - Placement of a VLAN in an MSTI. Region name or revision You can change the MSTP region name or revision. • Change the region name in MULTIPLE-SPANNING-TREE mode (up to 32 characters). name name Layer 2 213