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Demystifying OSPF: How It Works and Connects Devices in Your Network
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What is OSPF? (Open Shortest Path First) How does it work? How does it communicate within the network?
Welcome to our Free Cisco CCNA Training Course. Designed to help you become Cisco Certified in 2022. This series is for anyone who wants to build on their basic network skills and even pass the CCNA 200-301 exam. In this video, you will learn about OSPF Neighbors.
CCNA Routing - Section 2 of this series covers Layer-3/Routing. This covers topics like general routing, routing protocols, OSPF, and QoS (Quality of Service).
The website has additional links for further study to take you to the next level. Links are at the end of the description.
In this video, we’re going to cover:
0:00 Introduction
0:20 Finding Neighbours
10:50 Losing Neighbours
OSPF is a dynamic routing protocol that shares routing information through the network. It does this by detecting adjacent neighbors and forming neighbor relationships with them.
When OSPF is enabled on a router's interfaces, they start sending hello messages. They also start processing hello messages that they receive. These hello messages allow the routers to discover each other, become neighbours, and share routing information.
OSPF is enabled on interfaces with the ‘network’ command. This has a network and wildcard mask included. This tells the router which interfaces to enable OSPF on. This also includes the area that the interface should be part of. Area 0 is the only mandatory area.
Each OSPF router has a Router ID. This is a number that looks like an IP address. This is a unique value that identifies the router in the OSPF topology.
For neighbours to form, several details must match. These include the area number, authentication details, network/subnet details, timers, and MTU.
Neighbours may be lost if:
The OSPF process crashes, shuts down, or restarts
The interface the neighbour is connected on goes down
Hello messages go missing
Hello messages are sent regularly, and if they go missing, then something is wrong with the neighbour or the path to it. This can take a while to detect, so the hello interval and dead interval can be tuned for a faster response.
Thank you for watching out Free CCNA Training Course
LET'S CONNECT
#NetworkDirection
#networking
#CCNA
#200-301
Welcome to our Free Cisco CCNA Training Course. Designed to help you become Cisco Certified in 2022. This series is for anyone who wants to build on their basic network skills and even pass the CCNA 200-301 exam. In this video, you will learn about OSPF Neighbors.
CCNA Routing - Section 2 of this series covers Layer-3/Routing. This covers topics like general routing, routing protocols, OSPF, and QoS (Quality of Service).
The website has additional links for further study to take you to the next level. Links are at the end of the description.
In this video, we’re going to cover:
0:00 Introduction
0:20 Finding Neighbours
10:50 Losing Neighbours
OSPF is a dynamic routing protocol that shares routing information through the network. It does this by detecting adjacent neighbors and forming neighbor relationships with them.
When OSPF is enabled on a router's interfaces, they start sending hello messages. They also start processing hello messages that they receive. These hello messages allow the routers to discover each other, become neighbours, and share routing information.
OSPF is enabled on interfaces with the ‘network’ command. This has a network and wildcard mask included. This tells the router which interfaces to enable OSPF on. This also includes the area that the interface should be part of. Area 0 is the only mandatory area.
Each OSPF router has a Router ID. This is a number that looks like an IP address. This is a unique value that identifies the router in the OSPF topology.
For neighbours to form, several details must match. These include the area number, authentication details, network/subnet details, timers, and MTU.
Neighbours may be lost if:
The OSPF process crashes, shuts down, or restarts
The interface the neighbour is connected on goes down
Hello messages go missing
Hello messages are sent regularly, and if they go missing, then something is wrong with the neighbour or the path to it. This can take a while to detect, so the hello interval and dead interval can be tuned for a faster response.
Thank you for watching out Free CCNA Training Course
LET'S CONNECT
#NetworkDirection
#networking
#CCNA
#200-301
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