LSMS Connectivity

The main function of the LSMS is to provision LNP data through the ELAP to the EAGLE. To perform this task, the LSMS maintains active connections with one or more NPAC region servers and one or more EAGLE nodes. While it is the goal of the LSMS to maintain active connections to each NPAC server and EAGLE node as nearly full-time as possible, the more important goal is to reliably forward the data from the NPAC to the EAGLE as quickly as possible. To that end, a number of protective problem detection and recovery mechanisms are built into the LSMS design. Several of these protections actually allow for the termination of application connectivity in order to gracefully restore full connectivity and guarantee total recovery of data.

The performance of the LSMS is based on network connectivity that meets a Quality of Service expectation. The expectations by Oracle for network Quality of Service are as follows:

Network RTT latency of <= 70ms and network loss due to network error <= 0.1%

Network RTT latency of <= 120ms and network loss due to network error <= 0.01%

In the following situations, the LSMS proactively terminates and re-establishes application connectivity with the NPAC and EAGLE nodes:

If the LSMS detects network level connectivity failures with either the NPAC or EAGLE, the respective LSMS processes terminate the socket level connection and then reconnect. This disconnect and reconnect occurs in a matter of seconds. Built in resynchronization mechanisms ensure data recovery. The data transmission is delayed by the time required to disconnect and reconnect, but the execution of the recovery procedures prevents data loss.
If the LSMS detects critical internal errors that would cause system outages, the LSMS processes are designed to terminate and allow the LSMS sentry process to restart them. This is only done for significant internal errors that jeopardize internal LSMS communications. Once the sentry process restarts the LSMS processes, resynchronization provides full data recovery.