This attribute specifies the bandwidth pool which is to be used to
support the unspecified bit rate (UBR) service category except for
connections managed by a Vpt CA. The percentage of link capacity
reserved for the given bandwidth pool is the maximum bandwidth
that can be allocated to UBR traffic. The percentage allocated to
each bandwidth pool can be provisioned through the bandwidthPool
attribute under the CA.
The amount of bandwidth reserved for each UBR connection is
specified in the minimumCellRate attribute.