Expanded Uses for BGP
In this chapter, you will learn more about the newer features of Border Gateway Protocol (BGP). BGP, as we have seen, is the main way that information about routes gets around the global public Internet. Once used exclusively for spreading “routing about routing” information, BGP now forms the basis for many advanced capabilities.
We will examine the two advantages BGP enjoys when used for new purposes. First, BGP was designed to be extensible, so new features can be added without inventing a completely new protocol. In most cases, if a BGP peer does not know how to parse and use a certain type of update inside a network layer reachability information (NLRI) update, the receiver can simply ignore it (although ...