The Primary MDT node is selected in MCT cluster to determine which MCT peer must initiate the PIM-SSM Join to all discovered remote VTEPs and join the IP Fabric MDT to receive the traffic. The selection is based on MCT keep-alive (KA) client isolation role configuration and local and peer node status.
| MCT KA Role Configured/Selected | ||
|---|---|---|
| Primary | Secondary | |
| Local node status | Up | Shut |
| Peer node status | Up | Down |
Note
The MCT KA role is either configured or selected. The MCT node with highest IP address is the Primary node.
The local node status is based on shutdown status in cluster configuration.
The peer node status is based on Keep-Alive status.
If both MCT peer nodes have the MCT KA role configured as Primary, MDT join role is also selected as Primary in both the nodes and both MCT peer nodes receive MDT traffic.