The value of vRtrInetAggrAggregatorAS4Byte specifies the
aggregator's Autonomous System Number (ASN).
When vRtrInetAggrAggregatorAS4Byte is set to non zero, and
vRtrInetAggrAggregatorIPAddr is set to non-zero,
the supplied ASN and IP address will be used for the
aggregator path attributes.
When vRtrInetAggrAggregatorAS4Byte is not set, the aggregate
routes ASN and Router-ID will be used for the aggregator
path attributes.