How to Avoid a Split-Brain Scenario with Cisco Switches by Enabling Multicast Communication

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Red Hat Enterprise Linux 5+ and Red Hat Enterprise Linux 6+ use multicast for cluster communication by default, and multicast can be enabled in Red Hat Enterprise Linux 4+. Certain Cisco switches, such as the Catalyst line, come with IGMP snooping enabled by default and will not forward multicast traffic without an IGMP querier to determine the intended recipients. In this case, nodes will not...

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