vRtrIgmpGrpIfHostGrpSrcType 1.3.6.1.4.1.6527.3.1.2.23.4.5.1.3

vRtrIgmpGrpIfHostGrpSrcType indicates how this source entry was learned. If this source entry was learned by IGMP, it will be set to 'dynamic'. For statically configured sources, the value will be set to 'static'.