filmov
tv
Mastering Cisco OSPF: Understanding Link State Database, Network Types, and Neighbor State
Показать описание
In this video, we will be learning more about OSPF.
We’re going to cover:
0:00 The OSPF Database
3:53 Network Types
13:45 Neighbour States
OSPF routers keep a full map of the network topology. Unlike other routing protocols, they don’t just have ‘signposts’ pointing the way, they see the whole thing.
They store topology information in the Link State Database (LSDB). This is populated with information that they learn from their neighbors. This includes Router-IDs (Router Link States) and links (Net Link States).
To share this information, they send first send DBDs (Database Descriptors), containing LSAs (Link State Advertisements) to each other. These are summaries of the database. Another router can request more information with an LSR (Link State Request). It will receive a Link State Update (LSU) in response, and finally acknowledge it with an LSAck.
Once the database has been populated with information, the SPF (Shortest Path First) algorithm is run, and OSPF works out the best paths through the network.
OSPF has four different network types. The two we need to know for CCNA are Broadcast, and Point-to-point. Point-to-point is used when there will only be two routers on a link. Broadcast is used with Ethernet, when there could be many routers on the link.
To keep updates on a broadcast network to a minimum, one router per segment (VLAN) is elected to be the DR, and another is the BDR. These handle distributing OSPF updates to other routers on the segment (called DROthers).
OSPF routers use multicast for their messages. 224.0.0.5 is for all OSPF routers, while 224.0.0.6 is for all DR or BDRs.
While neighbours are forming, they go through several states. These are:
Down - The start of the process
Attempt - Only for an NBMA network (not needed for CCNA)
Init - Hello messages have been sent
2-Way - Bidirectional communication established, DR and BDR are assigned
ExStart - A Master router is selected
Exchange - DBD packets exchanged
Loading - LSRs and LSUs build the database
Full - The process is finished
Thank you for watching out Free CCNA Training Course
LET'S CONNECT
#NetworkDirection
#networking
#CCNA
#200-301
We’re going to cover:
0:00 The OSPF Database
3:53 Network Types
13:45 Neighbour States
OSPF routers keep a full map of the network topology. Unlike other routing protocols, they don’t just have ‘signposts’ pointing the way, they see the whole thing.
They store topology information in the Link State Database (LSDB). This is populated with information that they learn from their neighbors. This includes Router-IDs (Router Link States) and links (Net Link States).
To share this information, they send first send DBDs (Database Descriptors), containing LSAs (Link State Advertisements) to each other. These are summaries of the database. Another router can request more information with an LSR (Link State Request). It will receive a Link State Update (LSU) in response, and finally acknowledge it with an LSAck.
Once the database has been populated with information, the SPF (Shortest Path First) algorithm is run, and OSPF works out the best paths through the network.
OSPF has four different network types. The two we need to know for CCNA are Broadcast, and Point-to-point. Point-to-point is used when there will only be two routers on a link. Broadcast is used with Ethernet, when there could be many routers on the link.
To keep updates on a broadcast network to a minimum, one router per segment (VLAN) is elected to be the DR, and another is the BDR. These handle distributing OSPF updates to other routers on the segment (called DROthers).
OSPF routers use multicast for their messages. 224.0.0.5 is for all OSPF routers, while 224.0.0.6 is for all DR or BDRs.
While neighbours are forming, they go through several states. These are:
Down - The start of the process
Attempt - Only for an NBMA network (not needed for CCNA)
Init - Hello messages have been sent
2-Way - Bidirectional communication established, DR and BDR are assigned
ExStart - A Master router is selected
Exchange - DBD packets exchanged
Loading - LSRs and LSUs build the database
Full - The process is finished
Thank you for watching out Free CCNA Training Course
LET'S CONNECT
#NetworkDirection
#networking
#CCNA
#200-301
0:19:36
Mastering Cisco OSPF: Understanding Link State Database, Network Types, and Neighbor State
0:13:50
OSPF Explained | Step by Step
2:26:28
OSPF Deep Dive
0:04:03
OSPF Link State Database Explained
0:03:02
Mastering OSPF | Cisco OSPF | How OSPF works | OSPF Hidden Trick #cisco
0:10:38
OSPF Neighbor Discovery Process Explained
1:12:37
Lear OSPF Protocol
0:05:35
Mastering OSPF Configuration on Cisco Routers
0:06:55
Tipos de LSA en OSPF. #LSADeRouter, #LSADeRed, #LSADeResumen.Curso completo de enrutamiento IPv4-
0:06:31
How To Configure OSPF Cost
0:00:33
How To Configure OSPF On Cisco Devices
1:25:12
Deep Understanding of OSPF
0:09:52
The Most Important OSPF Design Considerations
1:27:48
OSPF Advance Concepts
0:10:01
OSPF Network Types | Broadcast and Point To Point Networks
0:09:51
22 OSPF OVERVIEW
0:02:56
CCNA 200 - 301 - Lesson 78: Understanding Types of Routers in OSPF
0:16:29
Mastering OSPF: Understanding the Requirements for Establishing Neighborship | Urdu/Hindi
0:14:02
CML2 OSPF Basic Configuration
0:00:54
Cisco Basic OSPF Configuration | 1 Minute Quick Configs | IPCisco.com
0:07:02
OSPF Neighbors In Different Subnets
0:53:42
Cisco Enterprise Series - Routed Infrastructure - OSPF 002 How OSPF Works
1:33:53
CCNA Training - OSPF Configuration
0:05:03
Mastering OSPF Prefix Suppression: Step-by-Step Guide | Network Optimization. CCNP 350-401 ENCOR
Комментарии