Basic L3VPN (BGP/MPLS VPN or VPRN) configuration. Nokia (Alcatel-Lucent) & Juniper


This time I will cover in details basic Layer 3 VPN (L3VPN or VPRN) configuration, and I decided to kill two birds with one stone by inviting Juniper vMX (read here on how to add vMX to Unetlab) to our cozy Alcatel-Lucent environment.

In this post we will configure BGP/MPLS VPN [RFC 4364] including:

  • PE-PE relationship configuration with VPN IPv4 family introduction
  • PE-CE routing configuration with both BGP and OSPF as routing protocols
  • Export policy configuration for advertising VPN routes on PE routers
  • AS override configuration
  • and many more

As a bonus track I will share with you Control Plane and Data Plane evaluation diagrams which help a lot for understanding the whole BGP VPN picture. Take your seats, there is no flying from VPNs!


Nokia (Alcatel-Lucent) virtual 7750 SR (vRR/vSR, TiMOS) first boot provisioning

Slice 1

I advertised to you recently another great virtual lab environment – Unified Networking Lab – with tools like that one I practiced the cool technologies of Alcatel-Lucent Service Routing platform and prepared to many certification exams. And I encourage you to go the same way, not just read the books and force the dumps, but actually build a topology and walk through interesting scenarios.

If you boot a Cisco router like 7210 one, or even Juniper vMX, you could configure some interfaces, protocols and so on right away. With Alcatel-Lucent 7750 SR this approach doomed to fail, you should know how bring to life 7750 virtual Service Router (vSR) once you booted it before any further configuration steps.

And this short post will be just about that, what should you configure on 7750 SR after the first boot to make it running with Unetlab or GNS3?  


Nokia (Alcatel-Lucent) BGP configuration tutorial. Part 2 – BGP policies. Community


In the first part of this BGP tutorial we prepared the ground by configuring eBGP/iBGP peering. We did a good job overall, yet plain BGP peering relationship is useless, the power of BGP in its ability for granular management of multiple routes from multiple sources. And the tools that help BGP to handle this complex task are BGP policies at their full glory.

In this part we will discuss and practice:

  • BGP export/import policies for route advertisement/filtering;
  • BGP communities operations;
  • Aggregation of BGP routes: route summarization technique and the corresponding aggregate  and atomic-aggregate path attributes



Unified Networking Lab for Nokia (Alcatel-Lucent), Juniper, Cisco and many more…


A long time ago in a galaxy far, far away engineers hunted eBay for used routers to meet their demand for home labbing. Rack-rental services were kings and an ability to run cisco ios under dynamips felt like pure magic. Those dark days are gone… Thanks to massive eruption of virtualization technologies.

In this topic I will introduce you to Unified Networking Lab (UNL) – web-based tool which is capable to run so many images in a so convenient way that you might read this whole topic with your jaw opened.

Want to know how to run Cisco, Juniper, Alcatel-Lucent, F5, Vyatta, Mikrotik and dozens of other networking OSes? You came to the right place.

This post is the most popular one at this blog, it outstands other topics by far and the reason is simple — UNL is a solid tool that helped many of us to reach our goals and it was completely free.

At this moment UNL team is looking for our help in their pursuit of making a better product — EVE-NG — which is an evolution of UNL and has a lot of planned improvements and new features. For a complete list of features and a demo of EVE refer to their campaign on Indiegogo.

We are community, we help each other.


Nokia (Alcatel-Lucent) BGP configuration tutorial. Part 1 – basic eBGP, iBGP


When we say Service Provider, we imply BGP and when we say BGP, we imply Service Provider. There is no way I would leave you without covering configuration steps for one of the most versatile, scalable and robust internet protocols also known as BGP. And here it is – BGP configuration guide for Alcatel-Lucent Service Routers. As with OSPF configuration tutorial I will cover configuration process for various BGP scenarios along with verification and troubleshooting steps bundled with colorful figures, detailed code snippets and useful remarks.

BGP is so huge that I had no option but to write about it in several parts:

Part 1 dedicated to basic eBGP/iBGP configuration. We will practice with common BGP configuration procedures at first, then learn how to export routes into BGP process and prevent unnecessary route reflection by means of split-horizon over eBGP links. After that we will see how to configure iBGP to spread eBGP learned routes across Autonomous Systems. I will cover the necessity of full-mesh iBGP topology and the use of the  next-hop-self  command for iBGP peers.

It’s perfect time to configure some BGP, right?


How to achieve Alcatel-Lucent’s Network Routing Specialist I (NRS I) certification


Almost every networks-oriented vendor has its own certification program. Some of them are familiar to every network engineer (like Cisco or Juniper certification programs) other are less popular (say Huawei or Brocade certification). And if you are reading this post, then you know (or at least wanna to know) about Alcatel-Lucent’s Service Routing Certification (SRC) program.

In this post I will talk about the very first Alcatel-Lucent Service Routing CertificationNetwork Routing Specialist I (NRS I) and its corresponding exam Alcatel-Lucent Scalable IP Networks #4A0-100. I will shortly describe what is NRS I course about,  and will mostly talk about what the #4A0-100 exam: what Alcatel-Lucent-specific topics you should focus on and what preparation materials to use?

Fasten your seatbelt, newcomer, you’re gonna achieve another certification soon!

If you already have a networking background jump right to the ALU-specific questions section


Nokia (Alcatel-Lucent). Configuring Packet (IP) Filters

Packet filters (or in Cisco terminology Access Control Lists aka ACL) are one of the most used tools in a network engineer’s tool set. Blocking telnet/ssh access, restricting specific traffic flows, implementing policy-based routing or NATing – all of these tasks use IP filter’s capabilities.

In this example I’ll show you how to configure basic SSH-blocking IP filter on Alcatel-Lucent Service Routing OS running  TiMOS-B-12.0.R8 both/i386 ALCATEL SR 7750 Copyright (c) 2000-2015 Alcatel-Lucent .


Nokia (Alcatel-Lucent) OSPF configuration tutorial

The purpose of this post is to cover basic OSPF configuration steps and commands. Intended readers are engineers with basic OSPF knowledge who want to know how to configure OSPF on Alcatel-Lucent Service Routers (7750-SR, 7705-SR, 7210-SR). All the examples are valid for TiMOS-B-12.0.R8 both/i386 ALCATEL SR 7750 Copyright (c) 2000-2015 Alcatel-Lucent.  software.


OSPF. Neighbors on a “point-to-broadcast” network

When it comes to basic OSPF troubleshooting the first-aid kit is Neighbor states and things, that should match to form an adjacency. And on one early morning while refreshing my memory on OSPF neighbor states I accidentally ran into quite interesting problem.

But before we start, answer the short question:

Will adjacency be formed between directly connected via Gig. Ethernet interfaces routers R1 and R2 if

  • R1’s OSPF interface type configured as point-to-point
  • R2’s OSPF interface type configured as broadcast

 Time’s up. The answer is – yes and no. Wanna know why? Jump in, I have to show you something.