Billion Electric Company BiPAC 8501/8521 - Manual (Page 168)

Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router
Chapter 4: Configuration
164
From the example:
VLAN untagged ports for Data/Internet: ethernet, wireless and wireless_wds.
VLAN untagged ports for Video: ethernet1, rfc-1483-0 ~ rfc-1483-6.
Click Apply to made changes effective immediately.
Mapping the VLAN Bridge with Bridge Interface created in Step1, you will see the relationship
in these two screenshots.
Step 4: IGMP Snooping Enable
Go Configuration Advanced IGMP.
IGMP Snooping must be enabled in order to allow video stream forwarding correctly.