This object indicates the hop limit of the corresponding
traffic flow.
If version 4 of the IP carries the traffic flow, then the value
of this column corresponds to the 'Time to Live' field of the IP
header contained by packets in the traffic flow (as observed by
the flow monitor).
If version 6 of the IP carries the traffic flow, then the value
of this column corresponds to the 'Hop Limit' field of the IP
header contained by packets in the traffic flow (as observed by
the flow monitor).
The value of this column is valid only if the 'hopLimit' bit of
the corresponding instance of cfmFlowIpValid is '1'.