Cisco CCNA Packet Tracer Ultimate labs: BGP Configuration Lab 1: BGP Answers Part 1
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Transcription:
In this topology, I’m using public IPv4 addresses. You can see a list of assigned IPv4 addresses on Wikipedia. This address block 8.8.8.0 belongs to level 3, 15 belongs to HPE, and 17 belongs to Apple. But we’re going to use those address blocks in our network to simulate a BGP network running on the Internet.
I’ve configured the topology with basic IP addressing, so what we need to do here is configure BGP.
sh ip int brief shows us that this address is configured on gigabit 0/0/0 on Router 1 and this loopback address is configured on Router 1…..
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Can Router 1 ping Router 2? Yes it can. So we have IP connectivity between Router 1 and Router 2. Router 2 also has a loopback address configured of 2.2.2.2 and IP address is configured on the Ethernet interfaces.
The same is true for Router 3 loopback address of 3.3.3.3 with IP addresses on Ethernet interfaces, and lastly the same thing is configured on Router 4. Router 4 has a loopback address configured as well as an IP address on the gigabit interface, so let’s configure a BGP.
In global configuration mode router BGP, we need to specify an autonomous system number. In our example it’s 65,001 now unlike IGP such as EIGRP and OSPF, we have to manually configure and neighbour relationships in BGP.
In BGP we use this concept just because I want to be your neighbour and it doesn’t mean that you want to be my neighbour, so both sides need to be configured statically with the IP address of the neighbour to form neighbour relationships with.
We then need to specify the remote autonomous system, which in this example is 65,002. So that’s how you can configure neighbour relationships in BGP. We can then advertise networks, so network and specify network.
Now this is really important, you need to specify a mask, this is not an inverse mask, this is a mask based on the route in the routing table. So sh ip route shows us that we have a /32 network directly connected, that’s the IP address configured on loopback 0.
So sh run shows us that this IP address is configured on the loopback and it appears in the routing table as follows. That means that when we configure BGP, we must configure BGP with the correct IP address and mask in exactly the same way as it appears in the routing table /32 mask.
So we use a /32 mask here. So let’s advertise 8.8.8.0 with the mask for that network. Notice it’s not an inverse mask, it’s a standard mask. Again, that’s based on this information as shown in the routing table.
That’s how you configure basic BGP. You specify your autonomous system number, you specify your neighbour with their autonomous system number and then you advertise routes into the BGP routing table.
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