The value of tmnxMcPathChassisPlnLimSecCap specifies the part of the
total chassis forwarding bandwidth that can be used for multicast
secondary paths when not all switch cards are functional.
The value must be less than or equal to the value of
tmnxMcPathChassisPlnLimPriCap.
The default value is 8750 when removable switch-fabric is supported and
9000 otherwise.