FortiSwitchOS 3.6.8 (https://docs.fortinet.com/uploaded/files/4585/fortiswitch-v3.6.8-release-notes.pdf) is out.
Looks like about two pages of fixed bugs, including the fix for IGMP snooping on 2XX and 4XX switch models.
If anybody has updated, please share your experience with the new version (and if you're managing them from the FortiGate or not). Thanks!
