Logical L3 processing for L2 hardware switches

摘要

A method for learning a MAC address of an end machine that is logically connected to a logical network is described. The method receives configuration data for implementing a distributed logical router having different logical ports each of which is associated with a logical port of a logical switch. The method receives a packet through a first logical port of the logical router that has a destination IP address associated with a particular logical switch that is associated with a second logical port of the logical router. In order to learn the MAC address of the end machine, the method sends a first broadcast packet with a first source MAC address to a first set of forwarding elements that implements the particular logical switch, and sends a second broadcast packet with a second source MAC address to a second set of forwarding elements that also implements the particular logical switch.