➢ Hello everyone.

➢ We are implementing a 2 node HA cluster, using OpenAIS 0.80.3 on SLES 11 HAE. 
We have found out our service provider is using Cisco switches which don’t 
support IP multicasting.

➢ We have checked and can’t see any multicast traffic running on the LAN, 
whereas on the virtual test development environment we have, it is.

➢ The odd thing is – the cluster is working fine. Can anyone tell me how it is 
communicating / establishing quorum etc. without multicast working? If it has 
found another communication route what are the reliability and performance 
implications?

➢ Regards,
➢ Darren Mansell


From extra investigation it seems the 2 nodes are talking using unicast on UDP 
5150. Does this mean we can't use any more than 2 nodes with Cisco switches?

Thanks
Darren
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