On Mon, Aug 09, 2004 at 01:32:23PM +0200, Lazar Obradovic wrote: > > > You also mentioned in another email that the "cman_tool leave" should issue > > a setsockopt to leave the multicast group, does this not happen automatically > > when the socket is closed? > > Actually no. When you close the socket that was a member of Mcast Group, > node does not sent "IGMP leave" message to router, so mcast packets > continue to arrive until router issues "membership refresh" procedure > (which, depending on configuration, is at every 30 seconds). > > If node does not confirm it's membership (and it won't since kernel > can't find any socket for the multicast group), mcast path gets pruned > at a router, but stays valid for another 2-3 minutes (also depending on > configuration). > > > If it isn't then cman_tool leave can do this I > > suppose. In the case where the cluster software exits without the help of > > cman_tool it will be fenced anyway so there shoudn't be a problem :-) > > That's true for fenced nodes, but it's not a clean solution, so, if it > isn't much of a trouble, I'd really like to have membership drop > implemented before socket gets closed. > OK, thanks for clearing that up. It seems I have some thinking to do... patrick
