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OSPF

Interview Questions – OSPF DR/BDR

How is DR elected in an network and how can others know who is DR, which specific address are used?On which network DR/BDR is...

Interview Questions: OSPF area types, router types , network types.

Why area 0 is called backbone area?How does summarization work in OSPF in case have A1-A0-A2?Can we connect a router which is not...

OSPF Adjacency States

Let’s check the OSPF adjacency State Machine, how OSPF routers go through various states before becoming adjacent. OSPF Routers goes through below 7 states /...

LSA 9 ,10, 11 – Opaque LSA

Coming soon this week...Stay Tuned

OSPF MTU MISTMATCH ISSUE AND FIX

While maintaining and creating neighbor adjacency OSPF sends IP MTU in its DBD packets. MTU should match on both ends for forming and even to...

OSPF Packets: Lets have a close look at OSPF packets

OSPF uses the following 5 packets(Click on the buttons, to view in details) between two routers to form and maintain the adjacency, topology table...

OSPF Packets: DBD

Let’s open the DBD packet and use what's inside, why DBD is required and how DBD are exchanged DBD: DATABASE Description packet, which has message...

OSPF Packets : LSR

Let’s continue to dive deep in the remaining packets: LSR: LSR i.e. Link state request packet is used to request a specific prefix or route which...

OSPF PACKETS: LSU

Link State Update packet: Link State Update (LSU) packets are OSPF message Type 4 in the OSPF header.The local router advertises LSA within an LSU...

OSPF PACKET: LSACK

Link State Acknowledgment packet: LSACK is message type 5 inside OSPF header.As the name suggests it is an acknowledgement sent in return to all the...