Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 141

ethernet1/1/17 128.324 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.324 ethernet1/1/18 128.328 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.328 ethernet1/1/19 128.332 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.332 ethernet1/1/20 128.336 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.336 ethernet1/1/21 128.340 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.340 ethernet1/1/22 128.344 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.344 ethernet1/1/23 128.348 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.348 ethernet1/1/24 128.352 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.352 ethernet1/1/25 128.356 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.356 ethernet1/1/26 128.360 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.360 ethernet1/1/27 128.364 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.364 ethernet1/1/28 128.368 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.368 ethernet1/1/29 128.372 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.372 ethernet1/1/30 128.376 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.376 ethernet1/1/31 128.380 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.380 ethernet1/1/32 128.384 128 200000000 BLK 0 32768 90b1.1cf4.a523 128.384 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ethernet1/1/1 Disb 128.260 128 200000000 BLK 0 AUTO No ethernet1/1/2 Disb 128.264 128 200000000 BLK 0 AUTO No ethernet1/1/3 Disb 128.268 128 200000000 BLK 0 AUTO No ethernet1/1/4 Disb 128.272 128 200000000 BLK 0 AUTO No ethernet1/1/5 Root 128.276 128 500 FWD 0 AUTO No ethernet1/1/6 Altr 128.280 128 500 BLK 0 AUTO No ethernet1/1/7 Disb 128.284 128 200000000 BLK 0 AUTO No ethernet1/1/8 Disb 128.288 128 200000000 BLK 0 AUTO No 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 Layer 2 141