IGMP IPTV Routing Configuration

Hi.

i have a problem getting my IPTV STB to work. i have found a configuration guide with Mikrotik devise but i have a Sophos XG and is wondering if anyone can helg me getting this to work.

My ISP delivers Internet access via vlan 102 and IPTV multicast streams via vlan 101.

The STB have to access both Internet and the IPTV multicast streams. 

If anyone can help me set this up with Sophos i will be greatful.

Here is the mikrotik commands used for another guy with the same ISP as me:

# 
/interface vlan
add comment=IPTV interface=sfp1 name=vlan101 vlan-id=101
add comment=Internet interface=sfp1 name=vlan102 vlan-id=102

#
/interface bridge 
add admin-mac=xx:xx:xx:xx:xx:xx auto-mac=no fast-forward=no name=IPTV-Bridge

#

/interface bridge port
add bridge=IPTV-Bridge hw=no interface=vlan101

#
/ip dhcp-client
add comment=Internett disabled=no interface=vlan102
add add-default-route=no comment=IPTV dhcp-options=\
"clientid,hostname" disabled=no interface=\
IPTV-Bridge

#
/ip firewall filter
add action=accept chain=input protocol=igmp
add action=accept chain=input protocol=udp
add action=accept chain=forward protocol=udp
add action=drop chain=input dst-port=53 in-interface=vlan102 protocol=udp

#
/ip firewall mangle
add action=mark-routing chain=prerouting dst-address=172.21.0.0/16 \ new-routing-mark=IPTV-Mark passthrough=yes src-address=0.0.0.0/0

#
/ip firewall nat
add action=masquerade chain=srcnat out-interface=vlan102 to-addresses=0.0.0.0
add action=masquerade chain=srcnat out-interface=IPTV-Bridge

#
/ip route
add distance=1 gateway=<iptv gateway> routing-mark=IPTV-Mark

#
/ip route rule
add routing-mark=IPTV-Mark table=IPTV-Mark

#
/routing igmp-proxy
set quick-leave=yes
/routing igmp-proxy interface
add alternative-subnets=0.0.0.0/0 interface=IPTV-Bridge upstream=yes
add interface=LAN