I have quite a few V1910 Comware switches running the (second to) latest firmware, they all connect back to a "Core" A5500-24G-SFP switch. I have DHCP running on a Windows Server box connected to the A5500, and it's doing dhcp-relay. I have both the BAGG, and individual ports setup as a dhcp-snooping trust on the V1910 switches, and the port going to the DHCP server on the A5500 is setup as a dhcp-snooping trust... I might have 20 AP's connected to a 1910 at a high school, and hundreds of kids walking around might hit it every hour or two. It seems to fail after a few days for no reason at all, turning DHCP-snooping off at the switch level fixes the issue, but is not a permanent solution. Is there anything required besides turning dhcp-snooping on at the switch level, and designating a port as the trust? This seems to take longer to manifest as an issue in lower traffic buildings and areas.
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