[ClusterLabs] corosync in multicast mode produces lots of unicast traffic

Jan Friesse jfriesse at redhat.com
Wed Oct 17 03:25:52 EDT 2018


> Hi!
> I have a Proxmox cluster which uses Corosync as cluster engine. Corosync 
> uses the "default" multicast configuration. Nevertheless, using tcpdump 
> I see much more packets sent by corosync using unicast between the node 
> members than multicast packets.
> Is this normal behavior? If yes, please point me to some documentation. 

It really depends. If cluster is quiet (no configuration changes) so it 
basically only heartbeats then it's pretty normal that unicast trafic 
(used for heartbeats) is bigger than multicast one.

> If no, does this mean I have some broken configuration? Everthing seems 
> to work fine with my setup.

So then you don't have to worry :)


> Thanks
> Klaus
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