Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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 bridge in CONFIGURATION mode. Configure the priority value range, from 0 to 65535 in multiples of 4096, default 32768. The lower the number assigned, the more likely the 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