Patent Document ID: 9118572
Application ID: 14022382
Patent Flag: 1

Claim One:
1. A method, comprising: discovering, by a particular autonomous system border router (ASBR) in a control-plane media access control (MAC) learning (CPML) network, one or more other ASBRs in the CPML network, wherein the particular ASBR and one or more other ASBRs are interconnected with respective ASBRs of a data-plane MAC learning (DPML) network; calculating one or more internal shortest path first (SPF) trees rooted respectively at each of the other ASBRs in the CPML network; receiving a MAC advertisement route for a given MAC address with a given next-hop Internet Protocol (IP) address; determining a distance from the particular ASBR and from each other ASBR in the CPML network to the given IP address based on the internal SPF trees; and in response to the distance from the particular ASBR being shorter than the distance from each other ASBR, designating the particular ASBR as a designated forwarder (DF) for traffic sourced from the given MAC address.