agentSwitchIGMPSnoopingIntfVlanIDs 1.3.6.1.4.1.4526.10.1.2.8.7.1.1.8

This field lists all the VlanIDs (each VlanID server is separated by comma and the list is terminated by semi-colon) which include the selected interface, an example would be 1,2,3;(no spaces in between).