[Linux-cluster] rhel 6.2 network bonding interface in cluster environment

Alan Brown ajb2 at mssl.ucl.ac.uk
Mon Jan 9 14:14:46 UTC 2012

On 09/01/12 13:33, Rajagopal Swaminathan wrote:

>> Switches used for this purpose are best completely isolated from the rest of
>> the network and multicast traffic control should be DISABLED.
> I distinctly remember asking the network guys Multicast mode to be on
> for the Heartbeat network (for the clusters that I have built).

You need multicast.

What you don't want, is any form of filtering based on packet rates 
(broadcast/multicast rate limiting). This gets in the way.

I can't emphasise enough that the heartbeat equipment is best separated 
from everything else. A spanning tree rebuild initiated elsewhere in the 
LAN may be enough to cause an outage long enough to generate a fence event

(Ethernet fabric switching is spreading, but spanning tree will be 
around for quite a while yet)

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