Unique identities of endpoints across layer 3 networks

A system comprising:

• one or more processors;
• and
• at least one computer-readable storage medium having stored therein instructions which, when executed by the one or more processors, cause the one or more processors to:
• receive, by a first networking device of the system in a first Layer 3 (L3) network, a first mapping of an Internet Protocol (IP) address to a first Media Access Control (MAC) address from a second networking device in a second L3 network;
• determine that the first MAC address is associated with a third networking device;
• receive a second mapping of the IP address to a second MAC address from the third networking device;
• determine that the second MAC address is associated with an endpoint in the second L3 network;
• store the IP address and the second MAC address as an identity of the endpoint;
• and
• present network utilization information of the endpoint using network traffic to and from IP address correlated to the endpoint based on the identity of the endpoint.

A non-transitory computer-readable storage medium having stored therein instructions which, when executed by one or more processors of a system, cause the system to:

• receive, by a first networking device of the system in a first Layer 3 (L3) network, a first mapping of an Internet Protocol (IP) address to a first Media Access Control (MAC) address from a second networking device in a second L3 network;
• determine that the first MAC address is associated with a third networking device;
• receive a second mapping of the IP address to a second MAC address from the third networking device;
• determine that the second MAC address is associated with an endpoint in the second L3 network;
• store the IP address and the second MAC address as an identity of the endpoint;
• and
• present network utilization information of the endpoint using network traffic to and from IP address correlated to the endpoint based on the identity of the endpoint.