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OSPF Troubleshooting

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...

LSA 1 – Router LSA

Router LSA is generated by every router in the OSFP domain. This LSA contains all the information about the LINKS a router has. ...

OSPF DR/BDR

Lets see how OSPF elects DR/BDR, how becomes DR, why BDR is elected first and the election process. Significance of DR/BDR As we are all aware,...

OSPF router stuck in Two way state – Is this a problem?

OSPF stuck in two way state - it is one of the favorite questions in the interview. But to know the possible reason for...

OSPF STUB AREAS

Let's check the what is Stub area, why we need Stub area and what are the different types of Stub area in OSPF.Stub area...