OSPF Multi Area Explained
160.3 هزار بار بازدید -
6 سال پیش
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In this video we're going to be looking at multi area OSPF.
Single area OSPF (Open Shortest Path First) works great in small networks however as the networks grow, some down sides to single area OSPF start to surface.
Huge LSDB!
OSPF will gather the entire network information and create an LSDB. This database will be the same on every router on the entire network. This can become very large filled with information that the router doesn't even really need.
Massive routing tables!
Along with the large LSDB, huge routing tables will be generated on each router. This will contain every subnet within the entire network!
Updates everywhere!
OSPF is great at responding to changes, however in such a large network problem can occur. Every router will need to reevaluate all routes and run the SPF algorithm anytime a change occurs, even if that change is as small as a network cable being unplugged. I’m sure you can imagine the work load required in a large network.
The solution!
OSPF multi areas is designed to segments your network and allows routers to summarise routes between the areas reducing the problems mentioned above.
Designing OSPF multi areas takes some planning to get the full benefit.
Each area should contain subnets that can be summarised.
All areas must connect to the backbone area/Area 0
#ccna #cisco #networking
Discord: discord
---------------------
MY FULL CCNA COURSE
📹 CCNA - https://certbros.teachable.com/p/cisc...
FREE CCNA FLASHCARDS
🃏 CCNA Flashcards - https://certbros.com/ccna/flashcards
HOW TO PASS THE CCNA
📚 Get a great book - https://amzn.to/3f16QA5
📹 Take a video course - https://certbros.teachable.com/p/cisc...
✔ Use practice exams - https://www.certbros.com/ccna/Exsim
SOCIAL
🐦 Twitter - Twitter: certbros
📸 Instagram - Instagram: certbros
👔 LinkedIn - LinkedIn: certbros
💬 Discord - https://www.certbros.com/discord
Disclaimer: These are affiliate links. If you purchase using these links, I'll receive a small commission at no extra charge to you.
---------------------------------------------------------------------------------------------------------------
In this video we're going to be looking at multi area OSPF.
Single area OSPF (Open Shortest Path First) works great in small networks however as the networks grow, some down sides to single area OSPF start to surface.
Huge LSDB!
OSPF will gather the entire network information and create an LSDB. This database will be the same on every router on the entire network. This can become very large filled with information that the router doesn't even really need.
Massive routing tables!
Along with the large LSDB, huge routing tables will be generated on each router. This will contain every subnet within the entire network!
Updates everywhere!
OSPF is great at responding to changes, however in such a large network problem can occur. Every router will need to reevaluate all routes and run the SPF algorithm anytime a change occurs, even if that change is as small as a network cable being unplugged. I’m sure you can imagine the work load required in a large network.
The solution!
OSPF multi areas is designed to segments your network and allows routers to summarise routes between the areas reducing the problems mentioned above.
Designing OSPF multi areas takes some planning to get the full benefit.
Each area should contain subnets that can be summarised.
All areas must connect to the backbone area/Area 0
#ccna #cisco #networking
6 سال پیش
در تاریخ 1397/09/19 منتشر شده
است.
160,351
بـار بازدید شده