On Fri, 2009-08-28 at 16:36 +0100, [email protected] wrote: > ➢ 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? >
They use unicast to transmit a token. When the token is received, a node may multicast any queued messages. In order to get to the unicast token state, multicast messages have to be sent and received to form the cluster membership. My guess is that your network is using multicast. Regards -steve > Thanks > Darren > _______________________________________________ > Openais mailing list > [email protected] > https://lists.linux-foundation.org/mailman/listinfo/openais _______________________________________________ Openais mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/openais
