--- name: Adjacency maintainer: Neale Ranns features: - An adjacency represents how to send different traffic types to a peer - The principles properties of an adjacency are the interface and rewrite. The rewrite will be prepended to the packet as it is forward through the interface. - The rewrite is provided either by the interface type. It can be constructed either from fixed interface properties (i.e. src,dst IP address on a P2P tunnel) or from a resolution protocol (like ARP on an Ethernet link). - An Adjacency is said to be complete when the rewrite is present and incomplete when it is not, - An adjacency that is a leaf in the DPO graph is terminal/normal (i.e on a physical interface). When not terminal it is termed a midchain (i.e. one on a virtual interface, e.g. GRE tunnel). Midchain adjacencies can be stacked/joined onto the the DPO graph that described subsequent forwarding (i.e. how to send the the GRE tunnel's destination address). - Glean adjacencies describe how to broadcast packets onto a subnet description: "Adjacencies represent the next-hop information required to reach a directly connected neighbour." state: production properties: [API, CLI, MULTITHREAD]