Dell PowerSwitch S4128F-ON EMC SmartFabric OS10 User Guide Release 10.5.0 - Page 483
Root selection, Priority 32768, Address 3417.4455.667f
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ethernet1/1/4:3 Disb 128.34 128 200000000 BLK 0 AUTO No ethernet1/1/4:4 Disb 128.35 128 200000000 BLK 0 AUTO No ethernet1/1/5 Disb 128.40 128 200000000 BLK 0 AUTO No ethernet1/1/6 Disb 128.48 128 200000000 BLK 0 AUTO No ethernet1/1/7 Disb 128.56 128 200000000 BLK 0 AUTO No ethernet1/1/8 Disb 128.64 128 200000000 BLK 0 AUTO No ethernet1/1/9 Disb 128.72 128 200000000 BLK 0 AUTO No ethernet1/1/10 Disb 128.80 128 200000000 BLK 0 AUTO No ethernet1/1/11 Disb 128.88 128 200000000 BLK 0 AUTO No ethernet1/1/12 Disb 128.96 128 200000000 BLK 0 AUTO No ethernet1/1/13 Disb 128.104 128 200000000 BLK 0 AUTO No ethernet1/1/14 Disb 128.112 128 200000000 BLK 0 AUTO No ethernet1/1/15 Disb 128.120 128 200000000 BLK 0 AUTO No ethernet1/1/16 Disb 128.128 128 200000000 BLK 0 AUTO No ethernet1/1/17 Disb 128.136 128 200000000 BLK 0 AUTO No ethernet1/1/18 Disb 128.144 128 200000000 BLK 0 AUTO No ethernet1/1/19 Disb 128.152 128 200000000 BLK 0 AUTO No ethernet1/1/20 Disb 128.160 128 200000000 BLK 0 AUTO No ethernet1/1/21 Disb 128.168 128 200000000 BLK 0 AUTO No ethernet1/1/22 Disb 128.176 128 200000000 BLK 0 AUTO No ethernet1/1/23 Disb 128.184 128 200000000 BLK 0 AUTO No ethernet1/1/24 Disb 128.192 128 200000000 BLK 0 AUTO No ethernet1/1/25 Disb 128.200 128 200000000 BLK 0 AUTO No ethernet1/1/26 Disb 128.208 128 200000000 BLK 0 AUTO No ethernet1/1/27 Disb 128.216 128 200000000 BLK 0 AUTO No ethernet1/1/28 Disb 128.224 128 200000000 BLK 0 AUTO No ethernet1/1/29 Disb 128.232 128 200000000 BLK 0 AUTO No ethernet1/1/30 Disb 128.240 128 200000000 BLK 0 AUTO No ethernet1/1/31 Disb 128.248 128 200000000 BLK 0 AUTO No ethernet1/1/32 Disb 128.256 128 200000000 BLK 0 AUTO No Root selection MSTP determines the root bridge according to the lowest bridge ID. To increase the likelihood of a bridge to be selected as a root bridge, assign a lower bridge priority numerical value to that bridge. You can set the priority value to 0 to force a switch to become the root switch. Value 0 is the highest priority. • Assign a bridge priority number to a specific instance in CONFIGURATION mode, from 0 to 61440 in increments of 4096, default 32768. spanning-tree mst instance-number priority priority Assign root bridge priority OS10(config)# spanning-tree mst 0 priority 32768 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 2 483
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1,118
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