The main function of a gRPC tunnel is to allow tunneling of TCP datagrams between SR OS nodes and third-party software entities. To minimize the impact on existing services, the internal cross-connect sends the decapsulated packets on a preconfigured TCP port using the local host as the destination. In this way, all internal applications receive the same data as they would from an external TCP connection.
The simplified view of the internal SR OS implementation is shown in the following figure.
Figure: Internal SR OS architecture
