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BGP

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...

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...

BGP Introduction

BGP - Border Gateway Protocol is the backbone of internet. It is a type of Exterior Gateway protocol and successor of EGP protocol. BGP...

BGP Message Types

BGP relies on different types of messages as with any other protocol. Let’s look at the different message types of BGP and their significance. ...

BGP states in details

BGP converges through different states before exchanging prefixes (NLRIs). It starts from IDLE state and converges to ESTABLISHED state. Now there are multiple states...

BGP Path attributes

As we discussed about the BGP in our BGP introduction article, we mentioned that BGP is a PATH vector protocol. What do we mean...

BGP Path Selection mechanism

IGPs such as RIP and OSPF chooses the best path on the basis of metric defined by the protocol i.e RIP metric is HOP...

BGP Split Horizon

BGP was build for Internet Routing keeping in mind, so when we see any rules or implication of BGP like why it is so...

BGP Route Reflector

As discussed in the article for Split Horizon Rule, IBGP neighbor doesn't forward routing update received from an IBGP neighbor to another. To...

BGP Communities Part 1 – Well known Communities

As mentioned by Jeff Doyle in his iconic "TCPIP volume 2" book - communities allows you to apply policies to a group of routes....