Locator/identifier split using the data link layer

TL;DR

This paper proposes redefining MAC addresses as pure layer-2 locators to improve Ethernet scalability and reduce routing pressure by enabling multihoming and traffic engineering at the data link layer.

Contribution

It introduces a novel reinterpretation of MAC addresses as locators, facilitating a clearer separation of locator and identifier functions at Layer 2.

Findings

Redefining MAC addresses as locators can enhance Ethernet scalability.

Layer-2 locator use enables multihoming and traffic engineering.

Potential reduction in routing complexity at higher layers.

Abstract

The locator/identifier split approach assumes separating functions of a locator (i.e. topology--dependent attachment point address) and identifier (topology-independent unique identifier) currently both served by an IP address. This work is an attempt to redefine semantics of MAC address to make it a pure layer-2 locator instead of a pure globally-unique identifier. Such an exercise might be interesting from the standpoint of Ethernet scaling and Metro Ethernet technologies. From the global routing perspective, introduction of multihoming, traffic engineering and failover at the 2nd layer may reduce pressure on the 3rd layer.