EPG vs. ESG
The evolution of Cisco ACI’s security model from EPGs to ESGs represents a significant maturation of the platform. While EPGs were instrumental in ACI’s original design, their tightly coupled nature presented challenges in large-scale and complex environments. The ESG model directly addresses these limitations by providing a more flexible, scalable, and operationally efficient approach to security.
The ESG’s ability to decouple security policy from forwarding, expand its scope to the VRF level, and leverage dynamic endpoint selectors allows network professionals to align their security posture with business logic in a way that was not previously possible. This shift not only simplifies complex tasks like route leaking and brownfield migrations but also conserves valuable hardware resources.
The decision of whether to primarily utilize EPGs or ESGs hinges on your specific application requirements and design philosophy.
