VPN Models – Advantages-DisAdvantages So let us see what are the advantages and disadvantages and the drawbacks of the overlay model and the pet to pin mode. So when you talk about overlay we need to think about Frame delay or IPsec GRE GRE kind of implementations. So frame lays not much used in the production networks now in today’s networks but still so when you talk about overlay model the they are very well known because we have been using for many years so they are very easy to…

VPN – Introduction In this section I’m going to introduce you with some of the most commonly used Van technology called VPN kind of implementation. So the first thing we’ll see the concept of VPNs and then later on we’ll see the different reasons why and how the VPNs were introduced and how they are much better technology than when you compare with the least line connections. And then finally we’ll also discuss some of the different kinds of VPN models. And in that our in this course we’ll be…

VPNv4 Peering – PE-PE Routers So in this section, we’ll continue with our VPN. MPLS l three VPN configurations. Like what we did in our previous scenarios is we have configured IGP inside the service portal network and then we also enable LDP inside the second step. And then we have configured P to C routing. I think we used static and default combinations. Sorry. Third step, we created a VRF and assign the interface facing towards the customer under the VRF. And then the fourth step we have configured…

VRF Configuration Now in this section we’ll see how to configure VRF on the provider edge routers. If you remember in the previous classes we have seen what is the concept of VRF. VRF is a virtual forwarding which is going to differentiate each and every customer. Let’s take an example called a router, a customer router which is blue, red, yellow. Even though they are connecting to the same router, still the provider edge router is going to maintain three separate routing tables in the form of PRF. But…

Virtual Route Forwarding -VRF – Route Distinguisher(RD) – Route Target(RT) Mplist. L three VPNs. Now in this section we’ll be focusing on three major things like first one will start with what is VRF and how exactly VRF useful in MPs responder networks. And then we’ll see something called Rod Value and Rtvalues. We call them as route distinguisher and route target values. How exactly they are going to relate with VRFs. So first let’s get started with the concept of VRF initially. Now, VRF stands for virtual route routing…

MPLS Layer 3 VPN In this video I’m going to show you how MPLS VPNs are going to work a little bit differently. So I’m just going to give some overview of how it’s going to work. But in fact, we’ll probably get into some more practical based MPLS and three VPNs later on sessions. So, as we have already discussed in our previous session, if you remember, we have seen some of the basic things about the lease line connections. Like we have been using dedicated lines for over…

MPLS LDP Troubleshooting MPLS LDP troubleshooting. Now, we are on the last step of the LDP. Probably we’ll see how to how to verify and troubleshoot your MPL configurations. So I have listed some of the possible issues here like MLS IP and then I have listed some of the specific Show commands which I generally use if I want to verify LDP configurations. Let’s go back and check check what are the possible issues you may come across in case if there is no LDP neighborship is established. So…

Penultimate Hop Popping Penalty made hop popping. So penalty made hop popping is actually a built in feature inside the MLS service for network which is going to optimize the MP’s performance. Now how it is going to optimize. So PHP is actually a behavior which is going to remove the requirement of doing the label lookup two times on the provider edge router. Now which means on the edge router before the label packet comes inside, before it goes outside as a normal IP packet, it’s not going to…

MPLS Label Forwarding MPLS label forwarding. Now in this section we’ll continue with our LDP configurations. Like if you remember, we have seen how to configure LDP inside the service powerful network initially by using something called MPLS IP command. Now in this section will verify how LDP is going to work or how it’s going to do the label forwarding. So the entire process goes in five steps. The first step will be IGP is built based on the routing table based on your Fib table. Now inside the…

Sharing Label Information In this section, I’m going to explain you how the sharing of the label information is done inside the service for network. In most of the cases, like in the previous session, we have seen that MPLS is a technology which is going to enter as a normal IP packet and then it’s going to forward the information by seeing the label lookup instead of a normal IP lookup. But in order for that to happen, like the router should should be able to forward the packet…