OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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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
                              

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