Multiple Spanning Tree is an advanced version of STP. In fact, you don’t need to play a lot with VLANs or VRFs for this lab, the topology is ready. It’s a key item for the switching part of the CCNP, and you simply create all the labs you want with four switches. Multiple Spanning Tree (MST) is an awesome protocol that can cut down the resources used by STP. This is probably one of the best things you can do with this CCNP lab setup. Of course, we repeat the process on the other Autonomous System and we are ready to get BGP rocking. To connect them, we create a dedicated VLAN which we make available to RRA as well (the other virtual router on R1). We run the route reflector of A (RRA) on R1, and then create RA1 in a VRF on R1, and RA2 in a VRF on R2. As a result, the link connecting EdgeA and EdgeB is nothing more than the link between R2 and R3. To accomplish this in our lab, we create the entire AS A on R1 and R2 and the AS B on R3 and R4. Here’s what the topology looks like.Įxample of logical topology for a BGP lab, leveraging VRFs to create virtual routers.Īs you can see, we have two systems composed of four routers each which are exactly specular. In fact, you can try eBGP, iBGP, and Route Reflectors in action. In this CCNP lab setup, you can easily try all the BGP concepts in a single-homed connection between two Autonomous Systems. FREE GNS3 LABS FOR CCNA HOW TOSpecifically, we will explain how to divide the lab into different VRFs and VLANs to create a logical topology that best meets a given scenario. In this part of the article, we will show what you can do with such a lab. To enhance your possibilities, however, we recommend using multilayer switches. That’s why our CCNP lab setup uses only four of them. CCNP switching topics can be replicated in a lab with very few switches. When doing the switching, you don’t have the concept of VRF. Boom, we have endless routing possibilities. In fact, you can create sub-interfaces on the routers’ links, and then associate each of them to a different VLAN. VRF is a Layer 3 concept, VLAN is a Layer 2 segregation concept, so they work well together. But the concept we are going to use to increase separation is even simpler: VLANs. Each virtual router has its own routing table and is independent of the other or from the physical router itself. Then, all interfaces with the same VRF name will be part of the same virtual router. You take a router and associate each interface to a given VRF name. In fact, our CCNP lab setup leverages VRF in some specific circumstances.įor the ones of you new to it, VRF is a routing virtualization and abstraction technology. Well, think again, because while we have 4 physical routers, we can easily turn them to 8, 12, or even 16. Multiply the number of routersĪt this point, many people think “Ok, I can get a great lab with 8 devices, but I won’t replicate a real scenario”. In the following paragraphs, we will see how to use it for BGP (eBGP and iBGP), advanced routing, and so on. However, it has a lot of potential in many different areas. The switches are connected together in a full-mesh topology. Our topology is simple is connected to the two other routers and to a multi-layer switch. Then, we connected them in a very special way. With these goals in mind, we took four routers and four switches.
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