12.4. Interdomain Routing
The only true domain-to-domain protocol in use in the Internet today is the BGP protocol. BGP usage is not predicated on the use of specific routing protocols within domains. For example, BGP is frequently used between domains running different and incompatible internal routing protocols (typically, OSPF or IS-IS). Unfortunately, BGP does not have mechanisms to deliver the topology and link status information that is important in computing routes in optical networks. Nor does it have mechanisms for dealing with multiple hierarchical levels. In this section, we examine how a hierarchical link state protocol can be used for interdomain (i.e., domain-to-domain) routing.
12.4.1. Routing Information Categorization
Different ...
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