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Routing

OSPF LOOP PREVENTION

There are two types of routing happens in OSPF. Intra- Area routing - Routes within area. In intra-area routing loops are prevented by OSPF SFP...

Interview topics – OSPF

OSPF packet types.OSPF area types, router types , network types.Neighbor adjacency state machine.OSPF as link state routing protocol, neighbor discovery.How to read OSPF tables(...

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...

Interview Questions – BGP path selection, route filtering, attributes, messages, troubleshooting.

If we have two routers connected to same ISP, which path will be selected as primary and on which parameter if all the attributes...

BFD – Bi-Directional Forwarding Detection

BFD is for faster detection of failures.It is independent of routing protocols, so it can be used with any protocol (known as client protocol).BFD...

BGP Communities – Lets have a look

BGP communities are the nothing but a method of tagging. Tagging can help in path manipulations and filtering. Tagging can be done on all...

IP Packet flow/Fundamentals of Routing

This blog will give a high-level explanation on how the basic packet flow works in a network, which includes your PC, Switches and Routers.We...

FUNDAMENTALS OF RSVP : Lets have a look with lab

When it comes to QOS, we have the three basic models as below: Best Effort (do not use QoS for traffic that does not need any...

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 /...