Routing - PfR MC and BR on same device

When implementing PfR, the architecture requires the assignment of particular roles to routers. Specifically, the role of the Border Router (BR) and that of the Master Controller (MC).

For smaller networks, the MC and BR roles can be configured on the same router. This is particularly common in smaller network deployments where there are only two routers.

In a two-router setup, one router can be set up as both the MC and a BR, while the other router can be set up as a BR.

Although this is possible, it may not be the best solution for larger networks due to potential performance issues. The dual role of MC and BR can put a significant load on a single router in a larger network environment. In such a case, it is preferrable to give different routers these roles whenever possible.

https://networklessons.com/cisco/ccie-routing-switching-written/cisco-performance-routing-pfr