One of the most intimidating topics for CCIE Lab certification candidates in the Route/Switch track is considered to be the Border Gateway Protocol (BGP). Let’s have an overview of the BGP, but before that, if you would be seeking the CCIE Certification and wish to clear the CCIE Lab Certification, you should gain the study dumps which are being offered at the SPOTO Club.
An Overview of BGP
BGP or Border Gateway Protocol is beloved to be just incredibly unique, especially when we would be comparing it to other routing protocols. The very first thing that would be making the BGP so unique is what it would be doing for us. It is considered to be the only EGP (Exterior Gateway Protocol) in major use today. We would be able to know about our Interior Gateway Protocols (IGPs), as well as that would be like OSPF which would be running inside of an autonomous system. But BGP is an EGP, which means that it would be usually going to take prefixes that would be inside an autonomous system as well as sending those to other autonomous systems. In the below-mentioned Diagram 1, there’s an example of a BGP topology.
Diagram 1: A Sample BGP Topology
This is why BGP is considered to be the protocol that would be making the Internet function. ISPs (Internet Service Providers) could be utilizing the BGP in order to move prefix information between other Internet Service Providers. The unique characteristics of BGP wouldn’t be just ending here, though. One of the things that would be considered to be unique about the protocol is that it would be forming point-to-point peerings with other BGP speakers, as well as you are required to create these peerings manually.
With BGP, the designers would be deciding not to engineer all those types of reliability controls into the protocol. They would be just relying on the wonders that would be the reliable communications of TCP. Particularly, BGP would be utilizing TCP port 179.
When you would be thinking of our routing protocols, you should know that there is going to be some value that would be serving as a metric value for measuring distance. For instance, in the case of OSPF, you would be able to know the metric is cost, and cost would be based directly on bandwidth.
When you would be forming a peering between autonomous systems, this is known as the EBGP (Exterior Border Gateway Protocol). Note: Some literature would be writing EBGP as eBGP. Remember, the reason BGP would be distinguishing between an EBGP peering and an IBGP peering is considered to be that operational characteristics would be going to need to change which would be based on how the peering is done.
You could refer back to Diagram 1 in order to see these diverse peering types in action. So, the rules change when we would be talking EBGP versus IBGP, in order to keep things consistent as well as error-free. And the unique properties of BGP wouldn’t be just ending here. You would be going to see, again and again, as you would be examining BGP in this chapter, that there would be just going to be case after case, where the protocol would be operating in a very different manner from what you would be expected with our IGP brethren.
So, if you wish to clear the CCIE Lab, you are required to have in-depth knowledge about the BGP and hence for more knowledge, you should acquire the study dumps, which are being offered at the SPOTO Club.