This feature allows you to configure all STP (Spanning Tree Protocol) modes (RSTP/MSTP (Multiple Spanning Tree Protocol)) bridge priority in increments of 1 or 4,096. Allowing this level of granularity of the priority allows a large range of priority values for the backup root functionality.
After priority reaches 0, backup root is unable to provide for rapid recovery in a lost root situation. In that case, priority returns to its initial configured (or default) value, and the process starts again.
Loss of root should be a rare event, but this feature setting provides a buffer in situations where network downtime to reset the root is not often available.
ExtremeSwitching and Summit X450-G2, X460-G2, X670-G2, X770,X440-G2, X590, X620, X870 series switches.
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