Open Shortest Path First cbt

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Published on August 4, 2017 2:27:38 PM ● Video Link: https://www.youtube.com/watch?v=-6TKWk1hf8Q

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Open standard
Successor of RIP
Shortest Path First
Algorithm
Classless routing
protocol
Updates are sent
Multicast IP address
Triggered Updates
Hello packets
sent every 10 seconds
Administrative
distance is 110
Unlimited
Hop Count
designated
backbone area
physical
interface
Router
ID.
highest IP
assigned
logical interface
Hello and
Dead Intervals
Authentication
database details
exchanged.
DR and BDR
priority is 1
Complex
configuration

OSPF is an interior gateway routing protocol that uses link states rather than distance vectors for path
selection. OSPF propagates link-state advertisements rather than routing table updates. Because only
LSAs are exchanged instead of the entire routing tables, OSPF networks converge more quickly than RIP
networks.
OSPF uses a link-state algorithm to build and calculate the shortest path to all known destinations. Each
router in an OSPF area contains an identical link-state database, which is a list of each of the router
usable interfaces and reachable neighbors.
The advantages of OSPF over RIP include the following:
• OSPF link-state database updates are sent less frequently than RIP updates, and the link-state
database is updated instantly rather than gradually as stale information is timed out.
• Routing decisions are based on cost, which is an indication of the overhead required to send packets
across a certain interface. The ASA calculates the cost of an interface based on link bandwidth rather
than the number of hops to the destination. The cost can be configured to specify preferred paths.
The disadvantage of shortest path first algorithms is that they require a lot of CPU cycles and memor

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