narbiks new foundation for v5 sample


this lab is a sample from narbik’s new foundation book v5 which can be downloaded here… 90 pages of free labs…

this first lab was instructive in getting used to how narbik operates. his v5 books should be interesting. below is the topology i used in gns3 to accomplish this lab.


and here is the zipped .net and configs…


have at it…

3.5.g Implement EIGRP [multi-address] named mode

  • 3.5.g [i] Types of families
  • 3.5.g [ii] IPv4 address-family
  • 3.5.g [iii] IPv6 address-family

piece of cake if you are familiar with address families…


R1(config)#do sh ver
Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M), Version 15.2(4)S, RELEASE SOFTWARE (fc1)

you’ll need a relatively new version of ios to support this

use a name instead of a number

R1(config)#router eigrp ?
<1-65535>  Autonomous System
WORD       EIGRP Virtual-Instance Name

R1(config)#router eigrp OZ

R1(config-router)#address-fam ipv4 autonomo 1
*Apr 26 14:55:15.199: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor (FastEthernet1/0) is up: new adjacency

older versions in address-family mode the autonomous system was configured on a separate line… now just put it on the same line with address-fam ipv4

use af-interface mode for interface specific commands:


topology base mode gives you the usual manipualation set:

R1(config-router-af)#topology base
Address Family Topology configuration commands:
auto-summary         Enable automatic network number summarization
default              Set a command to its defaults
default-information  Control distribution of default information
default-metric       Set metric of redistributed routes
distance             Define an administrative distance
distribute-list      Filter entries in eigrp updates
eigrp                EIGRP specific commands
exit-af-topology     Exit from Address Family Topology configuration mode
fast-reroute         Configure Fast-Reroute
maximum-paths        Forward packets over multiple paths
metric               Modify metrics and parameters for advertisement
no                   Negate a command or set its defaults
offset-list          Add or subtract offset from EIGRP metrics
redistribute         Redistribute IPv4 routes from another routing protocol
snmp                 Modify snmp parameters
summary-metric       Specify summary to apply metric/filtering
timers               Adjust topology specific timers
traffic-share        How to compute traffic share over alternate paths
variance             Control load balancing variance






How To Calculate an Idle PC in 0.8.6


Historically, and often for new users of GNS3 this can be frustrating. However, in the last couple of releases this has become much more stable, reliable and effective. We will be covering two methods to accomplish this.


Method 1


  1. Start GNS3 (optional but recommended; run as administrator) and drag a router or two to the workspace. Select the green start button to get it running.
  2. Start a performance monitoring tool as shown below.



Note the high cpu utilization. Selecting a good Idle PC value will remedy this.


  1. Right click on a router and select Idle PC from the drop down menu. This will issue a warning; click yes to calculate a new Idle PC value.



4. The GNS3 logo will come up on the screen while it is calculating the Idle PC value.




5. Once that is complete, you will be presented with drop down value choices, as below:




6. There should be a few choices for values in the drop down. If presented with a value that has an asterisk *, choose that one.

7. Your cpu utilization should drop significantly once an Idle PC value is selected. If not, repeat the process and select a different value.




Method 2 (Preferred)


  1. As in method 1, drag a router to the workspace, start it, then select Edit—IOS images and hypervisors.
  2. In the pop-up, Highlight the image you are calculating for and select auto calculation to the right of the empty Idle PC field.





3. Select Yes.

4. GNS3 will calculate the value. Select close.







5. Check performance with your performance monitor.


This How-To was performed on a notebook with a lower end Pentium B940 @ 2 GHz with only 4 G ram. Better results can be achieved with more ram and a stronger processor. However, it is safe to say with this latest release the folks at GNS3 have made substantial improvements. A third party program such as Process Lasso can also help with performance issues.


In the screenshot below there are 16 7200 routers operational.



Note that while the cpu is doing fine, ram is taking a big hit.