There, this is your host Habib Korea. And now we are going to start with chapter eight, which is community attribute. Before we go into it, actually, you can see the topology that we will use, it's from the previous chapter. And basically it's the same IP addressing of the interfaces. We will do basically the same exact setup which has already been done. We will apply ibgp between ISP one and r three ebgp connection or advertisement between ISP one and the customer router.
So that's great. Now, once that is already done, we can actually go and look into two of the common BGP community attributes one is going to be no advertise and the other scenario I will present is about no export. And also within this this topology I will introduce access list. And I will also introduce route map. That's how we will basically use these attributes to advertise using access lists and route map. So this is a refresher for access list and a route map and how we will apply that the syntax.
So So yeah, it will be exciting. So, let's go through the BGP community BGP community attributes are basically a numeric values that you can add to the prefix that you're advertising to the neighboring devices. And knowing that prefix is very important, then you can control the traffic or the routing of the traffic. So there are four known BGP community attributes. One is the internet. If you apply that it is already actually applied because BGP, BGP, his role is to advertise the prefix to all its BGP neighbors.
So that is the default community attribute that BGP has already. So we don't do anything on that. Number two is the no advertise, no advertise if no advertise is assigned to a network that means it will not get itself advertised to any BGP neighbor. Right? That the third one is no export. No export means It will not advertise to any ebgp neighbor.
So that network that you assigned, no export will not be advertised to the ebgp neighbor locally as local as is assigned to a network and that network will only be advertised within the same autonomous system. I hope that's clear. And see you in my next session four. For those two scenarios that I mentioned, no advertise as well as no export. And we will carry on from there