EIGRP over a vNET trunk

New IOS release 15.x introduced Easy Virtual Network (EVN) functionality to leverage some existing deployment features such as VRF-Lite and QinQ.

Its ease of configuration is a real advantage. The idea is very simple: tag each VRF and trunk them to other vNET routers (PE). We will show an example of how it runs on an EIGRP deployment of CEs connecting to each other through PEs that are vNET routers.

VPNv4 BGP AS-Override Feature into play!

AS-Override feature applies to sites that have the same AS number and are linked by another AS number.

In BGP, loop prevention would prevent any site from learning other site routes due to the presence of the same AS number in the AS_PATH of the advertised routes.

Fig. 1: setup network