T_X<p>for the former case it is broken when you have devices/listeners with <a href="https://chaos.social/tags/IGMP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IGMP</span></a> v1/v2 or <a href="https://chaos.social/tags/MLD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MLD</span></a> v1, instead of IGMPv3 / MLDv2. The issue you'll then potentially run into is IGMP / MLD report suppression. The big thing which <a href="https://chaos.social/tags/RFC4541" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RFC4541</span></a> specifies an ugly workaround for... this whole report suppression has lead to so many hard to debug, subtle breakages for decades and now seems to continue with <a href="https://chaos.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> <a href="https://chaos.social/tags/DSA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DSA</span></a> / <a href="https://chaos.social/tags/switchdev" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>switchdev</span></a>...<br><a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> <a href="https://chaos.social/tags/igmpsnooping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>igmpsnooping</span></a> <a href="https://chaos.social/tags/mldsnooping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mldsnooping</span></a></p>