The value of tRPAdminPSAcptActnAigpMetricVal specifies the value to
add or set for the route AIGP(Accumulated IGP) metric.
When the value of tRPAdminPSAcptActionAigpMetric is set to 'none(1)'
or 'useIgp(4)', the value of tRPAdminPSAcptActnAigpMetricVal is
ignored.