I understand. That visio is in direct relation to the affinity config guide and affinity is not only based on how many vSmart controllers are available, but a also is dictated by groups of vSmart controlers.
Configuring the maximum number of control connections for the Cisco vEdge device is a two-part process:
At the system level, configure the maximum number of control connections that the Cisco vEdge device can establish to vSmart controllers.
For each tunnel interface in VPN 0 , configure the maximum number of control connections that the tunnel can establish to vSmart controllers.
By default, a Cisco vEdge device can establish two OMP sessions for control connections to vSmart controllers. To modify the maximum number of OMP sessions:
vEdge(config)#system max-omp-sessions number
The number of OMP sessions can be from 0 through 100.
A Cisco vEdge device establishes OMP sessions as follows:
Each DTLS and and each TLS control plane tunnel creates a separate OMP session.
It is the Cisco vEdge device as a whole, not the individual tunnel interfaces in VPN 0 , that establishes OMP sessions with vSmart controllers. When different tunnel interfaces on the router have affinity with the same vSmart controller group, the Cisco vEdge device creates a single OMP session to one of the vSmart controllers in that group, and the different tunnel interfaces use this single OMP session.
By default, each tunnel interface in VPN 0 can establish two control connections. To change this:
vEdge(config-vpn-0-interface)#vpn 0 interface interface-name tunnel-interface max-control-connections number
The number of control connections can be from 0 through 100. The default value is the maximum number of OMP sessions configured with the system max-omp-sessions command.
When a Cisco vEdge device s has multiple WAN transport connections, and hence has multiple tunnel interfaces in VPN 0 , the sum of the maximum number of control connections that all the tunnels can establish cannot exceed the maximum number allowed on the router itself.
To display the maximum number of control connections configured on an interface, use the show control local-properties command.
To display the actual number of control connections for each tunnel interface, use the show control affinity config command.
High Availability Configuration Guide for vEdge Routers, Cisco SD-WAN Release 20
