OSPF Type3 Message / LSR Packet (Link State Request)

LSR (Link State Request / Type3 OSPF Packets) is simply a request as obvious from its name. After DBD phase for first time, routers keep on sending LSR to keep the LSDB in sync.

 

 

Consider the simple below topology with two Routers:

After the Hello & DBD, Requests are made from Routers to query the missing Database Parts.

It is obvious from the below detail, spend some time with it to understand it fully:

 

 

Written by 

Waqas Karim is a seasoned Network Expert … Geek. He is the founder of ATech. ATech was started for learning & sharing. Over time the platform has grown to include other resources which continue to attract fellow networkers. Today it sees upward trend of a hundred thousand visitors per month, scattered all over the globe. His specialty is networking, but his interest & expertise spans from traditional IT to Network Security including Programming, Virtualization, Service Provider & so on... no matter the badge on the box. He is CCIE Certified (CCIE#56732) in addition to below badges: Telecom Engineer (BE) + CCIE-RS (CCIE#56732) + Huawei Certified (HW#706632) + MBA Microsoft Certified MCITP, MCSE#109*26, CCNP-Sec, CCNP-SP, CCNA-DC, CompTIA Security+, Nokia NRS-I, JNCIA, ITIL Certified (ITIL#*6373), CEH (Certified Ethical Hacker).

avatar
7 Comment threads
5 Thread replies
0 Followers
 
Most reacted comment
Hottest comment thread
3 Comment authors
Vivaan.TDominic LeoWaqas KarimDominic LeoAdrian Recent comment authors
  Subscribe  
newest oldest most voted
Notify of
Vivaan.T
Guest
Vivaan.T

Good, especially the detailed answers to the questions asked

Dominic Leo
Guest
Dominic Leo

If OSPF neighborship in “down” state then how can i know its cause?

Adrian
Guest
Adrian

Why does’t DR and BDR election happen in OSPF P2P and P2MP Network?

Ajay
Guest
Ajay

There is any specified IP for dr/bdr?

Aaron Thomas
Guest
Aaron Thomas

What is OSPF Router ID and how is it elected?

Viktor Vaughn
Guest
Viktor Vaughn

Thanks, these posts really are great. Revising for ICND2.

Casey Barry
Guest
Casey Barry

Its nice