In traditional networking, if you want to route traffic between two external networks, you connect them to a router, configure your routing protocols, and let them exchange routes. But Cisco ACI doesn’t work that way. To make Cisco ACI act as a transit network, you must explicitly tell the fabric’s control plane to advertise external routes between L3Outs using the export route control option.
In this video-based article, we’ll see the exact step-by-step workflow for seamlessly making transit routing between two external routers via an ACI fabric.
Summary
- The Export Route Control Subnet scope controls which route should be advertised as a transit out of the L3Out.
- It is an exact prefix and length match (not LPM).
- This scope must be configured on an L3Out that advertises the subnet.
- The Aggregate Export scope allows prefixes to be aggregated together in the export direction (0.0.0.0/0 or ::/0 only).
- Is used in conjunction with the ‘Export Route Control Subnet’ and allows you to export all routes from one L3Out to another without having to list each prefix and prefix length.
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Additional Resources:
Migrating Existing Networks to Cisco ACI
What and Why Cisco ACI? (The Easy Way)
