The value of tRPOperPSAcptActnAigpMetricVal indicates the value to
be added or set for the route AIGP(Accumulated IGP) metric.
When the value of tRPOperPSAcptActionAigpMetric is set to 'none(1)'
or 'useIgp(4)', the value of tRPOperPSAcptActnAigpMetricVal is
ignored.