[pve-devel] corosync, multicast problem because of vmbr multicast_snooping enabled
aderumier at odiso.com
Sun Mar 3 18:11:41 CET 2013
Also, I use corosync in my vms for some virtuals cluster, and I also have problems because of vmbrX igmp_snooping
I also found a redhat bugzilla about it here:
----- Mail original -----
De: "Alexandre DERUMIER" <aderumier at odiso.com>
À: pve-devel at pve.proxmox.com
Envoyé: Dimanche 3 Mars 2013 18:02:15
Objet: [pve-devel] corosync, multicast problem because of vmbr multicast_snooping enabled
I had worked on a problem this week,
Since some month, I have corosync random failures.
Thanks to omping, I had check the multicast layer, and it seem that sometime it's hanging.
Also, I have had a strange thing, shutdown down a node had killed multicast between all my others nodes ....
I had found article here:
Telling that multicast_snooping on bridge can lead to problems.
(Multicast snooping is used to filter multicast, listen igmp packet to create groups, and avoid to send multicast to all ports).
I don't known how exactly it's works with linux bridge, But as my proxmox host ip is on vmbr0 (the default proxmox setup),
echo 0 > /sys/class/net/vmbr0/bridge/multicast_snooping
has resolved all my problems.
I'm not sure, but I think we should disable multicast_snooping by default. (Don't known if it can cause regression ?)
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