The servers that participate in the multiplex share messages and data via Inter-node Communication (INC). INC provides a TCPIP-based communication link between multiplex nodes. The link consists of heartbeat and pooled connections.
The topology view tab in Sybase Central shows the relationships between the nodes of a multiplex. INC links exist between the coordinator to the secondary nodes and from secondary nodes to the coordinator, but not between secondary nodes.
Secondary servers communicate with the coordinator via INC for DDL and global transactions. The coordinator communicates with the secondary servers via inter-node communication when certain stored procedures are executed on the coordinator. Secondary servers never communicate with each other.
