The value of tRPAdminPSDefActionAigpMetric specifies the editing
action to be taken for the AIGP (Accumulated IGP) attribute when
the route satisfies the match criteria of the policy.
The value of tRPAdminPSDefActionAigpMetric decides how to apply
tRPAdminPSDefActnAigpMetricVal to the route. When the value of
tRPAdminPSDefActionAigpMetric is set to 'none(1)' or 'useIgp(4)',
the value of tRPAdminPSDefActnAigpMetricVal is ignored.