Internet approach to scalable routing
Aggregate routers into regions known as “autonomous systems” (AS). We distinguish between Intra-AS and Inter-AS routing.
Intra-AS routing protocols configure routers to make possible routing among host, routers in same AS (“network”). All routers in AS must run same intra-domain protocol. Routers in different AS can run different intra-domain routing protocol. A gateway router is at “edge” of its own AS, has link(s) to router(s) in other AS’es.
Inter-AS routing is focused on routing among AS’es. Gateways perform interdomain routing (as well as intra-domain routing).
Figure 18 Example of three interconnected autonomous systems
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This resource was developed as part of an Erasmus+ project, funded with support from the European Commission under grant agreement 2016-1-SE01-KA203-22064.
The project was a collaboration between:
- The University of Borås, Sweden
- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
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