bridge only PPPoE packets or PPPoE relay server

RouterOS General
1

is it possible to bridge only pppoe frames/packets between LAN & WAN.
i have pppoe server at wan side, & i dont want to mix all traffic.
how can I forward the PPPoE ethernet packets between the two networks wihtout introducing lots of unnecessary broadcast traffic?
relay pppoe server or something like that???

thnx

2

Without going into too many specifics the simplest in your case could be to use the bridge filters available on Mikrotik.

Add the appropriate ports to a bridge; then review the bridge filters and only allow the specified frame types.