The value of tmnxBsxTransitIpPolicySubsCount indicates the
total number of subscribers within this transit IP policy.
The value of tmnxBsxTransitIpPolicySubsCount is the number of
rows in the table tmnxBsxTransitIpPolicySubTable with matching
tmnxBsxAaGrpPartIndex and tmnxBsxTransitIpPolicyId indices.