On the Nexus 7000 you need to disable OMF for each VLAN with IPv6 traffic. Otherwise IPv6 Neighbor Solicitations and all other IPv4/IPv6 source-only groups are not flooded within the VLAN.
Q1: In my eyes the better workaround is to enable MLD snooping for IPv6 traffic and leave OMF enabled. Is this correct? I didn't have the equipment yet to test.
Q2: On the Nexus 5000 OMF is also enabled by default but IPv6 traffic works (including Neighbor Discovery) even when OMF is still enabled and MLD Snooping is turned off. Do you know why?
Tested with 5548UP/5.2(1) and 5596UP/6.0(2) code.
Q3: It seems that the Sup2T on the catalyst 6500/6800 also implements OMF by default. Does anyone know if IPv6 traffic is forwarded by Sup2T without turning off OMF and without turning on MLD snooping?
Robert
