Dell PowerSwitch S5212F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 342
Root assignment
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ethernet1/1/10 128.296 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/11 128.300 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/12 128.304 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/13 128.308 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/14 128.312 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/15 128.316 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/16 128.320 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/17 128.324 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/18 128.328 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/19 128.332 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/20 128.336 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/21 128.340 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/22 128.344 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/23 128.348 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/24 128.352 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/25 128.356 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/26 128.360 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/27 128.364 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/28 128.368 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/29 128.372 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/30 128.376 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/31 128.380 128 200000000 FWD 0 32769 0000.0000.0000 ethernet1/1/32 128.384 128 200000000 FWD 0 32769 0000.0000.0000 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ethernet1/1/1 Disb 128.260 128 200000000 FWD 0 AUTO No ethernet1/1/2 Disb 128.264 128 200000000 FWD 0 AUTO No ethernet1/1/3 Disb 128.268 128 200000000 FWD 0 AUTO No ethernet1/1/4 Disb 128.272 128 200000000 FWD 0 AUTO No ethernet1/1/5 Desg 128.276 128 500 FWD 0 AUTO No ethernet1/1/6 Desg 128.280 128 500 FWD 0 AUTO No ethernet1/1/7 Disb 128.284 128 200000000 FWD 0 AUTO No ethernet1/1/8 Disb 128.288 128 200000000 FWD 0 AUTO No ethernet1/1/9 Disb 128.292 128 200000000 FWD 0 AUTO No ethernet1/1/10 Disb 128.296 128 200000000 FWD 0 AUTO No ethernet1/1/11 Disb 128.300 128 200000000 FWD 0 AUTO No 128.296 128.300 128.304 128.308 128.312 128.316 128.320 128.324 128.328 128.332 128.336 128.340 128.344 128.348 128.352 128.356 128.360 128.364 128.368 128.372 128.376 128.380 128.384 Root assignment RPVST+ assigns the root bridge according to the lowest bridge ID. Assign one bridge as the root bridge and the other as a secondary root bridge. • Configure the device as the root or secondary root in CONFIGURATION mode. spanning-tree vlan vlan-id root {primary | secondary} - vlan-id - Enter the VLAN ID number, from 1 to 4093. - primary - Enter the bridge as primary or root bridge. The primary bridge value is 24576. - secondary - Enter the bridge as secondary or secondary root bridge. The secondary bridge value is 28672. Configure root bridge as primary OS10(config)# spanning-tree vlan 1 root primary Verify root bridge information OS10# show spanning-tree active Spanning tree enabled protocol rapid-pvst with force-version rstp VLAN 1 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 24577, Address 90b1.1cf4.a523 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 24577, Address 90b1.1cf4.a523 We are the root of VLAN 1 342 Layer 2