Pseudo IGP protocol is a prototype of a simplified ISIS protocol that is used as a control Plane for SPB(Shortest-path-forwarding) algorithm in layer 2 topologies such as the Ethernet meshes, etc. This prototype is basedon CLI application created used C.It supports various modes to help and assist the developer such as the config, show,debug mode.It also has noticeable features such as parsing and cooking of protocol packets. It also has a neighbor shipmanagement state machine and a link state database for managing link state packets.
To Understand the architecture more checkout the Notes