12.1 INTRODUCTION
12.2 INTERDOMAIN CONTROL REQUIREMENTS
12.2.1 Scalability
12.2.2 Intervendor Interoperability
12.2.3 Administrative Partitioning
12.2.4 Deployment and Operations Considerations
12.3 DOMAIN HIERARCHIES
12.3.1 Relationship to Signaling
12.3.2 Routing Hierarchies
12.3.3 Identification of Components within a Hierarchy
12.3.3.1 OSPF Example
12.3.3.2 BGP Example
12.3.3.3 Operational Issues Arising from RA Identifiers
12.3.4 Diversity Services and Domain Representation
12.4 INTERDOMAIN ROUTING
12.4.1 Routing Information Categorization
12.4.1.1 Topology and Resource-Related Information
12.4.1.2 Domain and Node-Related Information
12.4.2 Routing within a Hierarchy
12.4.2.1 Routing Information Flow Up the Hierarchy
12.4.2.2 Routing Information Flow Down the Hierarchy
12.5 DISCOVERY PROCESSES AND HIERARCHY
12.5.1 Interdomain Discovery
12.6 SUMMARY
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