Hi folks,

After my youtube video with 40 routers I read some posts on Twitter from @Centronix , @Addizins and @mss7082 about someone who did 45 routers on a Windows machine.

I got curious about what the actual limit would be of the numbers of routers you can run on a single machine. If you add a lot of routers GNS3 becomes very unresponsive when you click and drag new routers to the screen. So far I got 107 routers and the system is running without any problems. I made a video to show you:

I've been messing around before with Gnome Terminal but was unable to make GNS3 automatically open all router telnet sessions in a single window and multiple tabs. There are some solutions when you google for it but it includes download scripts and making some changes.

Thanks to Darren who posted this in the forum there's an easier way to do it:

1. Make sure you have "konsole" installed otherwise install it by using 'sudo apt-get install konsole'
2. Start GNS3.
3. Go to "Edit" then "Preferences".
4. Open the "Terminal Settings" tab.
5. Enter this line at the "Terminal Command" box:

/usr/bin/konsole --new-tab -p %d -e telnet %h %p >/dev/null 2>&1 &

That's it. If you want to see an example check this youtube video:

Unfortunately it's not possible to run switches in GNS3 or Dynamips but if you want to pass the CCNP SWITCH you will need the practical experience to beat the exam. I just uploaded a huge lab that I use when i'm teaching switching/ccnp and you can find it in the switching section.

This lab will teach you everything you need to know for the CCNP Switch and it covers portchannels (etherchannel), spanning-tree, VTP (Vlan Trunking Protocol), vlans, private vlans, port-security, trunking and security features.

Let me know what you think of it, I'm curious if you like it!

Have fun!

Rene

Hi all!

Finally here it is...the OSPF troubleshooting lab!

If you are are preparing for CCNP and have the feeling you have a good idea how OSPF works you should check this one out. I tried to add pretty much anything that could possibly go wrong with OSPF into a single lab. This will help you understand the routing protocol and to pass the ROUTE or TSHOOT exam.

Keep in mind..try to solve this one without using the show run command, work your way through this by using debug or show ip ospf command and you'll become a true troubleshooting master. Perhaps it'll take you a couple of hours but I believe it's a good investment in your study progress!

Have fun!

Rene

Hi Folks!

Today i've been uploading some of the EIGRP (Enhanced Interior Gateway Routing Protocol pffew) labs that I didn't convert from my notes/paper/notepad to some nice GNS3 labs. I believe these will be helpful to you when you are studying for your CCNA or perhaps CCNP. Some of the labs will teach you the basics like how to let EIGRP only send unicast traffic or how to enable MD5 authentication.

Some of the more advanced ones show you how to play around with load balancing over (un)equal cost paths and will teach you more about the advertised and feasible distance which EIGRP uses. If that's not enough you can mess around with running EIGRP over a Frame-Relay point-to-multipoint setup or do some summarization!

The last one for today is the EIGRP Stub with a leak map...I guess if you want to use OSPF names you could kinda call this the "Not So Stubby" EIGRP version ;) Hopefully you have fun playing around with these labs...I got a few more coming. There will be plenty of labs to cover the "routing" part of the CCNP. If you think you know enough about EIGRP give the "Troubleshooting" lab a try.

Have fun!

Rene