A ratio used in allocating the allocatable bandwidth among the
various Service classes. This value is the amount of the overall
allocatable bw that can be allocated to VBR. The values are 1-255.
For a more detailed description of value useage see
sfcsBwPortPoolLimitsBwConstant. Total of all service classes for a
given direction should not exceed 256. (If it has never been set,
the value will be -1.)
WARNING - Setting this limit to an arbitrarily low value may
cause the switch to become inoperable as an SVC switch. PNNI
establishes VBR connections for switch to switch communications.
If an arbitrarily low limit is established, it may preclude
PNNI inter-switch operability.