This document provides comprehensive configuration procedures for establishing Layer 3 connectivity between the Cisco ACI fabric and external networks. It details the implementation of L3Out policies, including the configuration of dynamic routing protocols—such as BGP, OSPF, and EIGRP—as well as static routing. The guide serves as a foundational resource for integrating the ACI fabric into broader enterprise or service provider network infrastructures, ensuring robust traffic distribution and reachability.
This chapter contains the following sections:
Layer 3 routed connectivity to outside networks
Describes how Layer 3 outside network configurations manage traffic flow between the Cisco ACI fabric and external networks, including route discovery, quality-of-service selection, and traffic forwarding.
Create L3Out wizard
Describes how the Create L3Out wizard simplifies connections between the ACI fabric and external Layer 3 networks by guiding you through the required settings, routing protocols, and interface profiles.
Advertise host routes
Describes how the Advertise Host Routes feature advertises individual host routes from border leaf switches to external networks based on local endpoint connectivity and bridge domain associations.
Route reflectors
Describes how MP-BGP route reflectors distribute external routes across an ACI fabric and provide redundant connectivity between fabric leaf switches and external networks.