Inter-AS routing: BGP
BGP (Border Gateway Protocol): the de facto inter-domain routing protocol
- “glue that holds the Internet together”
BGP provides each AS a means to:
- eBGP: obtain subnet reachability information from neighboring ASes
- iBGP: propagate reachability information to all AS-internal routers.
- Determine “good” routes to other networks based on reachability information and policy
Allows subnet to advertise its existence to rest of Internet: “I am here”
Figure 19 AS3 autonomous system advertises a subnet to AS2, and then AS2 advertises to AS1
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Project
Contact
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
This resource has been released under Creative Commons license CC-BY-SA 4.0.
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- Academic content – The University of Alcalá (https://www.uah.es/en/)
- Technical resource development – The University of the Highlands and Islands Educational Development Unit - EDU (edu@uhi.ac.uk)
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