Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 158
Root assignment, Loop guard
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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 Root assignment RPVST+ assigns the root bridge according to the lowest bridge ID. Assign one bridge as 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 (1 to 4093). - primary - Enter the bridge as primary or root bridge (primary bridge value is 24576). - secondary - Enter the bridge as secondary or secondary root bridge (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 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 24577 90b1.1cf4.a523 128.276 ethernet1/1/6 128.280 128 500 LRN 0 24577 90b1.1cf4.a523 128.280 Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ethernet1/1/5 Desg 128.276 128 500 FWD 0 AUTO No ethernet1/1/6 Desg 128.280 128 500 LRN 0 AUTO No Loop guard This information explains how to configure loop guard on an interface. • Enable loop guard on a per-port or port-channel interface in INTERFACE mode. spanning-tree guard {loop | root | none} - loop - Enables loop guard on an interface. - root - Enables root on an interface. - none - Enables the guard mode to none. • Disable loop guard on a port or port-channel interface in INTERFACE mode. no spanning-tree guard loop 158 Layer 2