Cisco ACI L3Out Configuration Examples

Set Up the MP-BGP Route Reflector

This section shows an example of Infra MP-BGP configuration within each pod. This set up is a prerequisite to use any Cisco ACI L3Out configurations. All the examples in this document assume the Infra MP-BGP is configured.

Note

See the Cisco ACI Multi-Pod White Paper for more details about Infra MP-BGP between each pod (called external MP-BGP between spine switches).

Figure 1. Example Topology of Infra MP-BGP in Multi-Pod Setup

The preceding topology diagram displays an example where Cisco ACI is configured with infra MP-BGP AS number 65001 along with two route reflector spine switches in each pod. Infra MP-BGP sessions are established within each pod between the spine switches and the leaf switches. Leaf switches in each pod do not peer with route reflector spine switches in other pods. The following diagram explains how to configure the MP-BGP route reflector in this example.

Figure 2. Diagram of the MP-BGP Route Reflector Configuration

First, configure the AS number 65001 as Cisco ACI infra MP-BGP which is used for all the pods. Next, specify the spine switches to be the route reflector in each pod as follows:

Pod 1 node: 1001, 1002
Pod 2: node 2001, 2002.

Note

In this example, all spine switches are configured as route reflectors. However, if you have more than two spine switches per pod, not all spine switches are required to be configured as route reflectors. It is recommended to have two route reflector spine switches per pod.

For Policy Group name, in this example we use PodPG. In your example, you can use any name that you chooose. However, for the BGP Route Reflector policy, we choose the default policy, and you must use the default policy. Next, assign the default policy to the pod policy group and the PodPG to the pod profile as displayed in the preceding Figure.

Further details are displayed in the following related screenshots: