MPLS VPN – Part 3

MPLS VPN – Part 3

In this article I want to show you another MPLS VPN scenario with BGP running as PE-CE protocol. We are free to use any protocol between PE and CE routers, depending on situations. Normally these situations are decided after talking to customers. Anyway, suppose that we, as SP network, and customer have agreed upon running BGP between PE and CE routers. The requirements are as follows: - Customer A owns its AS number (AS #1), customer B owns its AS number too (AS #2) - Customers A and B have 2 offices and…Read more …
MPLS VPN – Part 2

MPLS VPN – Part 2

for the sake of easier reference, I put our topology here and continue. Remember the requirements that emphasis on incapability of R3 router to run MPLS. So we need to create a tunnel between two PE routers, because these two routers don’t have direct access to each other. What we are going to do is creating a tunnel between loopback interfaces of PE routers, assigning IP address on tunnel interfaces and enabling MPLS and changing the protocol from default to LDP. after that we must have our LDP neighborship in place. Just remember…Read more …
MPLS VPN – Part 1

MPLS VPN – Part 1

This topic relates to one of the most important SP technologies, MPLS L3VPNs. You know that there are different ways of creating VPNs, and MPLS L3VPN is just one of them. Discussing the fundamentals of this type of MPLS maybe needs a complete book, and I don’t want to go through it either. But I want to show you the configuration part. So what we need is a topology and its requirements. There are 2 customers, A and B, which are connected to a single service provider, AS 234. Each of these customers…Read more …
interconnecting Cisco and Juniper

interconnecting Cisco and Juniper

In this post I’m going to interconnect 2 routers, a Juniper J-series router and a cisco IOS router in GNS and run OSPF as routing protocol between them. This is just a basic config that shows how we can interconnect routers from two most respected infrastructure/solution providers together. There are so many different parameters regarding routing protocols and specifically OSPF which are beyond the scope of this simple article. Suppose we have this simple topology:   For the sake of test, I configured a loopback interface with 2 different IP addresses on Junos.…Read more …
load sharing with NAT

load sharing with NAT

Hi. my second post is about load sharing with NAT. you know that load balancing and load sharing is different terms. Actually in load balancing, device can really balanced the load between different links considering the actual amount of traffic that is passes through the links. but in load sharing, device can evenly share the connection between links without considering the amount of traffic and actual load. Anyway, with NAT you can do "load sharing" between devices and I'm going to show you the simple scenario here. suppose we have 2 servers inside…Read more …
Dynamic Multi-point VPN (DMVPN)

Dynamic Multi-point VPN (DMVPN)

Here is my first port and you'll see more as I finish pre-post tasks! In the fist post I'm going to publish a sample basic configuration for DMVPN. As you maybe know, this topic is recently added to the CCIE V5 bluprint and it is supposed to be asked in the lab. I think this technology will play a important role in lab, just like FR in V4, and we will have to build it as part of preparing our infrastructure for later tasks. Anyway, here is what I wrote for you: 5Read more …

Hello world!

Hi there! There are tons of technical blogs here and there and they are all part of a big picture already known to us! We need to learn the new ways of doing things which will lead us to the better opportunities, better jobs, more income and finally satisfaction. And I am one of those people who love to learn, to share what I know and help others to go forward. This site is a place for me to share what I want to share about Cisco and Juniper technologies. Maybe you are who have…Read more …