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What is Ospf in Networking | basic configuration | Tamil | IP Software S...

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Click here to view my video on youtube for below mentioned case study with real routers   Open Shortest Path First: OSPF is an OPen source Link State Routing Protocol that Makes its metric as Cost which is equal to 10^8 / bandwidth. OSPF is a Area Based and process based Routing Protocol. It is based on Dijikstra Link State Routing Algorithm IT does not send updates often like RIP The Complete convergence time is 30 minutes It has HEllo timer and dead timer which is 4 times the Hello timer It's protocol number is 89 Ospf maintains link state database (lSA) there are 7 types of lsa The OSPF's important Aspect is that BACKBONE AREA is 0 Multicast Address: 224.0.0.5 224.0.0.6 Hello Interval: default of 10 seconds Dead interval four times the Hello interval Administrative Distance Value is 110 Packets in OSPF hello packets Dead Packets update packets LSAs Request acknowledgement Tables inOSPF Routing Table- Basic table for routes Topology table - The com...
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OSPF Virtual Link Configuration Case Study_4

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OSPF Virtual Link This Blog contains the OSPF virtual link concepts with configuration on Cisco Routers. To know the basic concepts and configuration of ospf- ping here After the rush up of those concepts it may ease to follow though this blog. WHY Virtual Link ? Area 0 is the backbone of the OSPF network. It means that all the areas in the OSPF network must connect to the Area 0 . What happens if particular area is  not able to connect to the Area 0 ? There is two solutions one is that we can take a cable from the router from one area that is not connected to the backbone and connect the cable to the Nearest ABR-- This is funny and most probably it is not going to be possible. Second is the most Good and Wonder full technique of OSPF that is VIRTUAL LINK. [caption id="attachment_215" align="alignnone" width="590"] OSPF Virtual Link[/caption] Let us take the above example It has Four Routes R1 R2 R3 R4 R1 is ASBR (Autonomous Sys...
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