OS10 Enterprise Edition User Guide Release 10.4.1.0

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Root bridge selection

RSTP determines the root bridge. Assign one bridge a lower priority to increase the likelihood that it is selected as the root bridge.

  • Assign a number as the bridge priority or designate it as the primary or secondary root in CONFIGURATION mode. Configure the priority value range (0 to 65535 in multiples of 4096, default 32768). The lower the number assigned, the more likely this bridge becomes the root bridge.
    spanning-tree rstp priority 
                                           priority-value
                                        

View bridge priority and root bridge assignment

OS10# show spanning-tree active
                                 Spanning tree enabled protocol rstp with force-version rstp
                                 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
                                 Bridge ID    Priority 36864, Address 90b1.1cf4.a523
                                 Configured hello time 2, max age 20, forward delay 15
                                 Interface                                                 Designated
                                 Name              PortID   Prio  Cost  Sts  Cost Bridge ID         PortID
                                 ----------------------------------------------------------------------
                                 ethernet1/1/6:3   128.282  128   2000  FWD  0    32768  3417.4455.667f  128.152
                                 ethernet1/1/6:4   128.283  128   2000  BLK  0    32768  3417.4455.667f  128.153
                                 Interface
                                 Name              Role  PortID  Prio Cost Sts Cost Link-type Edge
                                 -----------------------------------------------------------------
                                 ethernet1/1/6:3   Root  128.282 128  2000 FWD 0    AUTO      No
                                 ethernet1/1/6:4   Altr  128.283 128  2000 BLK 0    AUTO      No
                              

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