Enables and disables the backup root feature.
| stpd_name | Specifies an STPD (Spanning Tree Domain) name on the switch. |
| on | Enables backup root. |
| off | Disable backup root. |
By default, the backup root feature is disabled.
The backup root feature is used to get faster convergence when the root bridge connectivity is lost.
Backup root feature enabled bridge port should be connected to Root with point to point link. When backup root bridge loses contact with the root bridge, the backup root bridge automatically lowers its bridge priority below the priority of the lost root. This causes the backup root bridge to become the new root. If a reboot occurs, the new root will have its priority restored to the original configured value.
If the priority of the root bridge is zero and the backup root loses connectivity to the root bridge, automatic assignment of the priority value for the backup root will be the initial configured value.
This feature is activated only when connectivity with the root bridge is lost. Raising the priority on the root does not cause the backup root feature to be activated.
The following example enables the backup root feature on the STP (Spanning Tree Protocol) domain r1:
configure stpd r1 backup-root on
This command was first available in ExtremeXOS 15.7.1.
This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X590, X620, X690, X870 series switches.
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