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In the previous section, we already learn
about dynamic routing eigrp and ospf.

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Next in this section, we are going to learn
about dynamic routing BGP.

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So what is the differences between eigrp ospf and bgp? EIGRP
and OSPF is IGP or interior gateway protocol,

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but BGP is EGP or exterior gateway protocol.

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What is IGP and EGP?

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IGP is used inside autonomous system. And
EGP is used between Autonomous System.

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What is Autonomous System? In simple word, we
can say that Autonomous System is a Company.

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So let’s say here we have Google,
absolutely google have a network right?

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So we have many router inside google. And
we also have many server inside google.

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All of server and router is connected each
others. So here we have an autonomous system.

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Every autonomous system will have an identifier,

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which is a number, so let’s say the
autonomous system number of google is 100.

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Next, let’s say here we have facebook, inside
facebook, we also have many router an many server.

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So here we also have an autonomous
system, let’s say autonomous system 200.

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Next, let’s say here we also have twitter,
we have many router and server here,

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so here we also have an autonomous
system, let’s say autonomous system 300.

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So the summary is, autonomous system
is a network inside a company.

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To connecting many router inside autonomous
system, we can use IGP, you are free to choose

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between EIGRP or OSPF or actually, we also
have other choices for IGP, which is IS-IS.

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So let’s say in google, we use eigrp, ospf,
or is-is. If all of the router is cisco,

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we can use EIGRP, but if the router not
only cisco, let’s say we have juniper,

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Huawei, hp and others, so
we can use OSPF or IS-IS.

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And then to connecting between autonomous
system or between company, we will use EGP.

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In EGP, we just have 1 choice, which is
BGP. So to connecting google and twitter,

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connecting google and facebook, connecting
facebook and twitter, and others, we must use BGP.

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Okay so that is the concept of Autonomous system.

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I think enough for this video, in the next video we are going to learn about BGP.

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Thankyou for watching and see you on the next video.