Today’s show is about Locator/ID Separation Protocol (LISP), a project that’s has been in development with various standards bodies since 2007.
An IP address is an overloaded construct. Today’s networking uses the IP address to determine both “who you are” and “where you are.” That is, an IP address is a name as well as a location.
This isn’t scaling; it runs into operational problems because there is no abstraction. A router must know all possible locations to select a forwarding path. And this means ever-larger forwarding tables in network devices.
In very simple terms, LISP separates the HOST ADDRESS from the ROUTING PATH in the same way DNS solved the HOSTS file back in the 1980s. It uses overlay networking, has dynamic path control, and a central mapping server that looks like an SDN controller.
We talked about LISP back in 2012, so it seemed like a good time for an update to find out what’s new.
Greg Ferro chats with LISP expert Dino Farinacci, a consultant and former Cisco Fellow and network engineer.