Cross VLAN Multicast / PIM Config

[DarkNate]

To use VLAN 1 in MT world, one has to speak ROSish quite fluently … it’s not a problem of VID itself, the problem is that it’s used in ROS as implicit default all over place and one has to know how to look to see it. And then change it according to needs. Which might be too much of a hassle, thus recommendation to avoid VID=1 if possible. Effectively it’s the same as Cisco (with it’s native VLAN concept) and many other vendors, who all treat VLAN with ID=1 in some special way (ROS is quite modest at it, it allows one to reconfigure things which is more than some others allow).

You misunderstood me. VLAN 1 has special value or meaning only in Cisco in the world of network engineering as a whole:
https://lostintransit.se/2022/09/05/is-vlan-1-special-in-cisco-networks/

On Juniper, Arista, MikroTik, Cumulus - All these stated vendors, allow you to prune VLAN 1. On MikroTik this means:

/interface bridge
add frame-types=admit-only-vlan-tagged name=bridge vlan-filtering=yes