Intra-AS routing: OSPF
Also known as interior gateway protocols (IGP)
Most common intra-AS routing protocols:
- RIP: Routing Information Protocol
- OSPF: Open Shortest Path First (IS-IS protocol essentially same as OSPF)
OSPF (Open Shortest Path First)
- It is “open”: publicly available
- Uses link-state algorithm
- Link state packet dissemination
- Topology map at each node
- Route computation using Dijkstra’s algorithm
- Router floods OSPF link-state advertisements to all other routers in entire AS
- Carried in OSPF messages directly over IP (rather than TCP or UDP)
- Link state: for each attached link
- IS-IS routing protocol: nearly identical to OSPF
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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.
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- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
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