Protocols that have inter-server functions as well as the regular client–server communications include the following:
Some of these protocols employ multicast strategies to efficiently deliver information to multiple servers at once.
Zhou, Jingya; Fan, Jianxi; Cheng, Baolei; Jia, Juncheng (2016). "Optimizing Inter-server Communications by Exploiting Overlapping Communities in Online Social Networks". In Carretero, Jesus; Garcia-Blas, Javier; Ko, Ryan K.L.; Mueller, Peter; Nakano, Koji (eds.). Algorithms and Architectures for Parallel Processing. Lecture Notes in Computer Science. Vol. 10048. Cham: Springer International Publishing. pp. 231–244. doi:10.1007/978-3-319-49583-5_18. ISBN 978-3-319-49583-5. 978-3-319-49583-5 ↩