Lotus Sametime Unified Telephony supports redundant active/active applications for cluster softswitches. During normal operation a redundant cluster operates in a loadsharing operation (active/active). Both nodes participate in traffic processing, observe each other and backs up the other nodes configuration data.
During normal operation, the cluster operates in an active/active mode:
Traffic is distributed evenly across the available nodes and across the available call processing instances within each node.
Each node serves as a backup to the other node.
During call processing, each process saves its contexts to the backup node at various points in the call.
The Figure shows a normal active/active mode scenario with the RTP. When a hardware or software failure occurs, a backup node takes over the traffic of the failed node, preserving stable calls by accessing the partner context pool.
Normal Active/Active Mode with RTP Support
Parent topic: Cluster Redundancy