xgs360028fMRSTPInstanceConfigurationMaxAge 1.3.6.1.4.1.890.1.5.8.78.2.11.1.1.2.1.6

The maximum age of the information transmitted by the Bridge Instance when it is the Root Bridge. range : 6 - 40 (seconds), and MaxAge must be <= (FwdDelay-1)*2. default: 20.