In a Cisco SD-WAN high availability (HA) vManage cluster, several components work together to ensure redundancy and availability. The vManage cluster is responsible for network management and configuration and consists of multiple servers that handle different functions.

Application Server: This server handles the core functionalities of vManage, including processing user requests, managing configurations, and executing policies. In an HA setup, multiple application servers work together to provide redundancy and load balancing.

Messaging Server: The messaging server is responsible for inter-server communication within the cluster. It ensures that configuration changes, policy updates, and other important messages are propagated across all vManage servers in the cluster.

These components work in tandem to maintain the operational integrity and availability of the vManage system in an HA configuration.

Cisco SD-WAN vManage Cluster Deployment Guide

Cisco SD-WAN High Availability Configuration Documentation