Considerations for IGMP and MLD Snooping Switches says (p5, bottom):
An IGMP snooping switch should be aware of the link layer topology changes caused by Spanning Tree operation. When a port is enabled or disabled by Spanning Tree, a General Query may be sent on all active non-router ports...
First, I want to make sure that "enabled" and "disabled" really mean "forwarding" and "blocked" and don't refer to administrative state of the port. Is that what others understand?
Second, I'm wondering if that includes the initial transition to Up as the switch comes online. My intuition says it should send queries then but I'm concerned that the list of "active non-router ports" at power up contains all ports. Is there any problem with (or benefit to) sending queries out ports that have routers?
Thanks for any feedback or insight you can provide.
Chris