Dell PowerSwitch S4112F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 519

ethernet1/1/27 128.216 128 500 BLK 0 32769 3417.ec37.1400 128.56 ethernet1/1/28 128.224 128 500 BLK 0 32769 3417.ec37.1400 128.64 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ---- ethernet1/1/5 Altr 128.40 128 500 BLK 500 AUTO No ethernet1/1/6 Altr 128.48 128 500 BLK 500 AUTO No ethernet1/1/7 Desg 128.56 128 500 FWD 500 AUTO No ethernet1/1/8 Altr 128.64 128 500 BLK 500 AUTO No ethernet1/1/9 Altr 128.72 128 500 BLK 500 AUTO No ethernet1/1/10 Altr 128.80 128 500 BLK 500 AUTO No ethernet1/1/25 Desg 128.200 128 500 FWD 500 AUTO No ethernet1/1/26 Root 128.208 128 500 FWD 0 AUTO No ethernet1/1/27 Altr 128.216 128 500 BLK 0 AUTO No ethernet1/1/28 Altr 128.224 128 500 BLK 0 AUTO No Select the root bridge Rapid-PVST determines the root bridge by the VLAN bridge priority. Assign one bridge a lower priority to increase the likelihood that it becomes the root bridge. The show spanning-tree brief command displays information about all ports regardless of the operational status. ● Assign a number as the bridge priority or designate it as the root in CONFIGURATION mode, from 0 to 61440. spanning-tree {vlan vlan-id priority priority-value} ○ vlan-id - Enter a value between 1 to 4093. ○ priority priority-value - Enter the priority value in increments of 4096, default is 32768. The lower the number assigned, the more likely this bridge becomes the root bridge. The bridge priority the valid values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, or 61440. All other values are rejected. Configure root bridge OS10(config)# spanning-tree vlan 1 priority 4096 View active configuration OS10(config)# do 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 4097, Address 90b1.1cf4.a523 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 4097, Address 90b1.1cf4.a523 We are the root of VLAN 1 Configured hello time 2, max age 20, forward delay 15 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/5 128.276 128 500 FWD 0 4097 90b1.1cf4.a523 128.276 ethernet1/1/6 128.280 128 500 FWD 0 4097 90b1.1cf4.a523 128.280 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge Layer 2 519