ctIGMPVlanRobustness 1.3.6.1.4.1.52.4.1.3.5.1.2.1.7

The Robustness Variable allows tuning for the expected packet loss on a Vlan. If a Vlan is expected to be lossy, the Robustness Variable may be increased. IGMP is robust to (Robustness Variable-1) packet losses.