mjhjmtu

This article https://openwrt.org/docs/guide-user/network/wifi/dumbap about creating a bridged access point only is clearly incomplete, but mentions this example:

config interface lan
 option type 'bridge'
 option ifname 'eth0 eth1' # Bridges lan and wan
 option proto 'dhcp' # Change as appropriate

then later this which is for devices with a dedicated switch (my situation, I suppose, but I don't understand the eth0.1 VLAN)

config interface lan
 option type 'bridge'
 option ifname 'eth0.1 eth1' # Bridges vlan 1 and wan
 option proto 'dhcp' # Change as appropriat

Now call me out if I'm wrong, but eth0 and eth1 represent two different physical interfaces. This begs the question: Which MAC address do I use to tell the main router's dhcp server to reserve a static ip address. The device I am using for the access point is a Netgear R7800.

root@netgear-r7800:~# ls -l /sys/class/net
lrwxrwxrwx 1 root root 0 Oct 20 16:05 br-lan -> ../../devices/virtual/net/br-lan
lrwxrwxrwx 1 root root 0 Jan 1 1970 eth0 -> ../../devices/platform/soc/37200000.ethernet/net/eth0
lrwxrwxrwx 1 root root 0 Jan 1 1970 eth1 -> ../../devices/platform/soc/37400000.ethernet/net/eth1
lrwxrwxrwx 1 root root 0 Nov 1 07:57 gre0 -> ../../devices/virtual/net/gre0
lrwxrwxrwx 1 root root 0 Nov 1 07:57 gretap0 -> ../../devices/virtual/net/gretap0
lrwxrwxrwx 1 root root 0 Nov 1 07:57 ifb0 -> ../../devices/virtual/net/ifb0
lrwxrwxrwx 1 root root 0 Nov 1 07:57 ifb1 -> ../../devices/virtual/net/ifb1
lrwxrwxrwx 1 root root 0 Jan 1 1970 lo -> ../../devices/virtual/net/lo
lrwxrwxrwx 1 root root 0 Nov 1 07:57 sit0 -> ../../devices/virtual/net/sit0
lrwxrwxrwx 1 root root 0 Oct 20 16:05 wlan0 -> ../../devices/platform/soc/1b500000.pci/pci0000:00/0000:00:00.0/0000:01:00.0/net/wlan0
lrwxrwxrwx 1 root root 0 Oct 20 16:05 wlan1 -> ../../devices/platform/soc/1b700000.pci/pci0001:00/0001:00:00.0/0001:01:00.0/net/wlan1
lrwxrwxrwx 1 root root 0 Oct 20 16:05 wlan1-1 -> ../../devices/platform/soc/1b700000.pci/pci0001:00/0001:00:00.0/0001:01:00.0/net/wlan1-1