![]() ![]() However, Cluster communication will only go through one network at a time. Heartbeats are always traversing all Cluster enabled adapters and networks. Destination node’s NetFT adapter receives the UDP packet and then sends the TCP connection to the destination node’s Cluster Service.NetFT sends this UDP packet over one of the cluster-enabled physical NIC adapters to the destination node targeted for destination node’s NetFT adapter.NetFT wraps the TCP connection inside of a UDP packet (source port 3343).Cluster Service establishes TCP connection over NetFT adapter using the private NetFT IP address (source port 3343).Cluster Service plumbs network routes over NIC1, NIC2 on NetFT.The communications from the Cluster Service to other nodes through the NetFT adapter looks like this. The NetFT adapter will dynamically switch intra-cluster traffic to another available Cluster network if it goes down or isn’t responding. Cluster communication is constantly going on as things progress. Bandwidth is not as important as quality of service.Ĭluster communication between nodes is crucial so that all nodes are currently in sync.Latency delays could mean performance issues, including removal of nodes from membership. Communication is sensitive to latency and packet loss.Ensure any firewall rules have this port open for both TCP and UDP ![]() There is more to heartbeats, but will defer to my other blog No Such Thing as a Heartbeat Network for more details on it.įor Cluster communication and heartbeats, there are several considerations that must be taken into account.
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