[pve-devel] corosync, multicast problem because of vmbr multicast_snooping enabled

Michael Rasmussen mir at datanom.net
Sat Mar 9 18:31:47 CET 2013


On Sat, 9 Mar 2013 17:31:54 +0100
Michael Rasmussen <mir at datanom.net> wrote:

> tcpdump -i vmbr20 -vv net 224.0.0.0/4                   
> tcpdump: listening on vmbr20, link-type EN10MB (Ethernet), capture size
> 65535 bytes 17:20:45.093219 IP (tos 0xc0, ttl 1, id 0, offset 0, flags
> [DF], proto IGMP (2), length 32, options (RA)) 0.0.0.0 >
> all-systems.mcast.net: igmp query v2
> 
After making some investigation the above request can be interpreted
this way:
ttl 1: Restricted to the local subnet, no router hops
0.0.0.0 (group address): for Host Membership Query

The query router election seems to be disregarded since another host in
my cluster having a numerical higher higher IP than another host also
sends host membership queries:
tcpdump -i vmbr20 -vv net 224.0.0.0/4
tcpdump: listening on vmbr20, link-type EN10MB (Ethernet), capture size
65535 bytes 18:25:20.093126 IP (tos 0xc0, ttl 1, id 0, offset 0, flags
[DF], proto IGMP (2), length 32, options (RA)) 0.0.0.0 >
all-systems.mcast.net: igmp query v2

Maybe this is caused by my setup where the switch drops all multicast
traffic except on the cluster administrative network in which case the
hosts cannot see each other.

@alexandre: Do you have multicast traffic enabled on all vlans on your
switch or is this reserved only on the cluster administrative network?


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