In the diagram above, we need to do the following:
1- Enable Eigrpusing AS 10
2- Make surethat EIGRP should operate as classless routing protocol.
3- CNE-Global router has a static route to 192.168.50.0/24,CNE-Italia and CNE-Albania should receive this route via EIGRP without usingredistribution.
4- CNE-Italia and CNE-Albania should have adefault route pointing to the 192.168.50.0/24 network at CNE office. No staticroutes can be used to accomplish this.
5- Make surethat EIGRP should not form neighborrelationships on any interface where EIGRP routers do not exist.
6- CNE-Global router should summarize 172.50.0.0 -172.50.7.255 into a single network advertisement.
7- CNE-Globalrouter should perform unequal load balancing to reach the 10.1.1.0/24 network.
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Ready? Let’s solve it
1- Enable Eigrp using AS 10
Let’s enable EIGRP onCNE-Global
Now let’s enable EIGRP on CNE-Italia
And nowlet’s enable EIGRP on CNE-Albania
So, are we done??
Let’s have a look on CNE-Albania and establish this command “show ip route”
As you can see, network 172.50.0.0/16 is summarized, hmmm.What should we do now??
Let’s hop over CNE-Global and establishing this command “noauto”
Now, we go to CNE-Albania and do a “show ip route” commandagain
Wow, that looks better now Jand this fulfills step 2.
Now I want to show you something which is really nice. Let’sdo a “show ip eigrp topology” command on router CNE-Global.
Can you notice this??
Network 10.1.1.0/24 has two paths, one through CNE-Albaniaand another through CNE-Italia. Do you remember what we call those two paths??First one is the ‘successor’ which has a feasible distance of 5511936, and theother one is the ‘feasible successor’ which has the feasible distance of10511872. Why?
Look to the diagram again. Aha, the path between CNE-Globaland CNE-Italia has a bandwidth of 256 kbps, but the other path to CNE-Albaniais 512 kbps, it is as twice as the first one. That’s why CNE-Albania is the ‘successor’.
3- CNE-Global router has a static route to 192.168.50.0/24,CNE-Italia and CNE-Albania should receive this route via EIGRP without usingredistribution.
Let’s do a ‘showip route’ command on CNE-Global, to see how life is.
Sure enough, router CNE-Global has a static route to192.168.50.0/24 network. All we have to do is the following:
Now let’s make sure that life is good, on CNE-Italia let’sdo a ‘show ip route’ command
Sure enough, looks good now.
4- CNE-Italia and CNE-Albania should have a defaultroute pointing to the 192.168.50.0/24 network at CNE office. No static routescan be used to accomplish this.
Is that possible? A default route pointing to a network?
Yes!
On router CNE-Global, let’s do a ‘ip default-network’command.
Let’s check it out now
Voila! It’s marked with this ‘star’ now, which means ‘candidatedefault’. There is something you need to know about the ip network-defaultcommand, it has to be classful.
5- Make sure that EIGRPshould not form neighbor relationships on any interface where EIGRP routers donot exist.
This is really a very important step, as we all know, EIGRP is sendinghello packets through out all interfaces, and this is really a security wholethat can be used to inject poisoned routes. So, we have to block any interfacethat is not connected to a router. This is how we do it, by using passiveinterfaces, which will still advertise networks, but won’t send hello packets,thus, no enigbor relationships will be formed.
And we will do the same on CNE-Global, and keep only Se0/0 and Se0/1. Andbecause we have a lot of interfaces on CNE- Global, it more easy to do thiscommand first ‘passive-interface default’ to turn all interfaces to passive,then activate only what we need in this example, the two interfaces mentionedabove.
6- CNE-Global router should summarize 172.50.0.0 -172.50.7.255 into a single network advertisement.
Now let’s use our Subnetting skills :).
So now we know what our subnet maskis, how we do this on EIGRP?
We can configure this under eachinterface that is advertising routes.
Let’s check now
Great!
7- CNE-Global router should perform unequal loadbalancing to reach the 10.1.1.0/24 network.
EIGRP, has a very wonderful feature which is ‘Load Balancing’.How can we configure this?
By using ‘variance’ command. Here, we will usevariance 2, which means that EIGRP will load balance across links that are twotimes as bad as my primary.
Let’s check out now
As we can see, EIGRP has two pathsnow to 10.1.1.0 network.
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Download pkt file here http://tinyurl.com/ohqs8ys
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To read more about EIGRP, please visit
1-Introduction to EIGRP http://goo.gl/LxTR6
2- Configuring EIGRP http://goo.gl/Nh2t9y