Difference between igmp_snooping on switch and interface section

[Ultrazauberer]

I did just one more test: I let my iptv box running and made a tcpdump on the entire eth1 interface. I see there IGMP packets. I did the same for the entire eth0 interface and couldn't get a single packet within 5 minutes while the iptv box was running.
Then I enabled in the switch config igmp_snooping for eth1. The subscribed iptv stream began to stutter and hanging for several seconds, I could still see some IGMP packets on eth1 interface. I think this happens because I didn't reboot the iptv box. But then I made a tcpdump on eth0 and now with igmp_snooping enabled on eth1 I also see packets on eth0? This is the same behaviour like described here:

Multicast/switch/snooping/vlan problem. Bug?

Ok, now I've tested swapping the cpu ports. The most annoying thing with that is that the mac addresses are also swapped, so computers on the inside deems that the connection has changed. Not serious, just annoying. But the results are clear. With this setup, the query frames still end up on eth0 (which is now lan), even with igmp snooping enabled globally on all ports. eth1 ends up being isolated (like it should). In other words, this means that eth0 for some reason is special. I did revert ba…

Now the obvious question: I thought this bug is already fixed in the latest build? How would my network config look like if I want to invert the CPU ports for eth0 and eth1?

My current network config (igmp_snooping on switch disabled) looks like this:

root@OpenWrt:~# cat /etc/config/network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fdbc:33fb:8f21::/48'

config interface 'lan'
        option type 'bridge'
        option igmp_snooping '1'
        option ifname 'eth1.1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth0.7'
        option proto 'pppoe'
        option password '[...]'
        option username '[...]'
        option ipv6 'auto'

config interface 'wan6'
        option ifname 'eth0.7'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'
        option igmp_snooping '0'
        option igmp_v3 '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option vid '1'
        option ports '1 2 3 4 5 6t'

config switch_vlan
        option device 'switch0'
        option vlan '7'
        option vid '7'
        option ports '0t 5t'

config interface 'wg0'
        option proto 'wireguard'
        option private_key '[...]'
        option listen_port '[...]'
        list addresses '10.14.0.1/24'

config wireguard_wg0
        option public_key '[...]'
        option persistent_keepalive '25'
        option description '[...]'
        list allowed_ips '10.14.0.3/32'

config wireguard_wg0
        option public_key '[...]'
        option persistent_keepalive '25'
        option description '[...]'
        list allowed_ips '10.14.0.4/32'

config route
        option interface 'wg0'
        option target '10.14.0.0'
        option netmask '255.255.0.0'

root@OpenWrt:~#

Would the config with the inverted CPU ports for eth0 and eth1 (and enabled igmp_snooping) looks like this?

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fdbc:33fb:8f21::/48'

config interface 'lan'
        option type 'bridge'
        option igmp_snooping '1'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth1.7'
        option proto 'pppoe'
        option password '[...]'
        option username '[...]'
        option ipv6 'auto'

config interface 'wan6'
        option ifname 'eth1.7'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'
        option igmp_snooping '1'
        option igmp_v3 '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option vid '1'
        option ports '0t 1 2 3 4 5'

config switch_vlan
        option device 'switch0'
        option vlan '7'
        option vid '7'
        option ports '5t 6t'

config interface 'wg0'
        option proto 'wireguard'
        option private_key '[...]'
        option listen_port '[...]'
        list addresses '10.14.0.1/24'

config wireguard_wg0
        option public_key '[...]'
        option persistent_keepalive '25'
        option description '[...]'
        list allowed_ips '10.14.0.3/32'

config wireguard_wg0
        option public_key '[...]'
        option persistent_keepalive '25'
        option description '[...]'
        list allowed_ips '10.14.0.4/32'

config route
        option interface 'wg0'
        option target '10.14.0.0'
        option netmask '255.255.0.0'

Thanks in advance!