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In the section we're going to talk about BGP basics and applications running protocols are basically
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divided into IGMP and Egypt as you know as it can be understood from the name I keep these are the protocols
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used in the internal network and AGP is a general name for the Pericles to use.
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But when it works in other net.
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In other words between different autonomic systems to get the protocol BGP is also an AGP DGP is very
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different from IGP routing protocols as the working mechanism I use criteria called metric to reach
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at Target that from one point to another.
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For example Ripp uses the metric hop count or SPF and Elijah first try to find the first line and preferred
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that but by taking a loop to the bandwidth delay or something like that unlike BGP it's the polis seabeds
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running protocol that allows you to control traffic flow using many different features.
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The main purpose of BGP is to perform routing between different autonomous systems without the loop
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as you can see in our figure we have two systems.
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And if you want to share the route between these two it on ARM systems we can use BGP many different
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permissions can be used for BGP path selection but if none of these per milliards are configured BGP
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behaves like RIP and decide on the number of hops past the hope count means a number in terminology
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of BJP.
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So let's say the ich ISP has different autonomous number as four and as five let's say that
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HQ wants to reach to branch and if I don't configure any BGP attribute the thing I'm going to just look
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is the last number that I am passing.
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So the rote will be in that direction because I'm just passing I asked the to and oh I'm sure I speak
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4 and 5 let's say and they're going to be 23.
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I'm just passing I asked before an ISP Phife I'm passing through space.
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But any year I'm passing Three-Eyes space so distraught will be perfect.
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All right let's take a look to the tables that we are using in BGP we have BGP table neighbored table
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and periodic table neighbored table consists of all BGP call for your neighbors.
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And please keep in mind that guys neighbors are configured manually on BGP BGP table contains all BGP
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routes.
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And this table can be very very large sometimes and running table contains the best paths for the destination
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networks as happened on the other protocols.
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And lastly we are going to focus on the BGP message types the first messages open after the neighbor
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who rather is recognized it wants to initiate the neighborhood by sending their rather open message
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with this message.
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The two rather start the BGP appearing and the second message type is keeping alive to peers periodically
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send this message to each other.
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Keep alive message is sound.
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Air is six the second and with this message the BJP neighborhood remains active and we update my search
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running informations sent between two neighbored to peer others and network information is contained
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in this update in our search and we have lastly a notification message and this is a message sent by
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Pyrenean growlers when there is a problem with the not for cations message.
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The neighborhood builder pier is and.
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