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OSPF neighbors on either side of a L2 switch, OSPF route updates are lost

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TitleOSPF neighbors on either side of a L2 switch, OSPF route updates are lost
Symptoms
- OSPF route updates lost
- OSPF hellos dropped
Environment
OSPF neighbors on either side of a Layer 2 EXOS switch
Cause
IGMP snooping is trying to predict where the OSPF updates should go, sometimes it gets it wrong. 
Resolution
disable igmp snooping <vlan>

This will cause the switch to flood the packets through all ports on the vlan, causing the updates to go through properly.
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