Okay, guys, I am going to simulate
three networks. The ones I had on the board. The 30 that 10.8 dot 8 30 dot Tenn 30.0.9 dot nine and 30 dot Tenn dot Tenn 18.104.22.168 slash 24 on router to a one.
I'm going to simulate these by creating what are called Luke back interfaces.
Lou, back interfaces are basically virtual interfaces on the router.
So how do I create a loop back interface? I simply say interface
And if I execute the help feature by saying question mark or by typing question, Mark rather,
you see that I can basically pick any number out of this range
for my lube back interface I d.
I'm gonna pick eight Blue Back eight Interface, Lou back eight. And you see, as soon as I enter
the loo, Back into face was created, and the line protocol has been changed to up
signing tonight P address I p.
Then I create my next Lou back. I'm gonna make this loop back nine
and my i p address is going to be 30 dot Tenn 30.0.9 dot nine slash 24 quickly create Blew Back into face 10. All I'm doing is hitting the up arrow key to school through my commands and bring the command back up
and then just changing the relevant fields
on my interface. So Lou, back 10 is going to have an address of 30 dot Tenn dot Tenn 22.214.171.124 so use my up arrow key to bring up the 30 dot tender 9.9 just changed the nines to 10.
Now, if you notice I haven't done a new shut on these interfaces
if I said you show i p interface
you see that these interfaces are already up up without me having to say no shutdown blew back into fishes. You can manually shut one down. So let's shut down, Lou. Back 10
with the shutdown command.
And look at our show. I'd be interface brief command again
and see I can manually shut it down. And now it says administratively down, down. But by default they are up
as soon as you create them.
So once again, do show I'd be into face brief
and are interfaces are up, up
now I'm going to include these interfaces in e r g r p.
Can I see around her? E j r p 100 from this configured prompt. Of course I can router e I g r p 100
and my prompt changes to the router prompt.
And then I'm going to do a network statement that encompasses all three interfaces. So
dot Tenn 0.0.0 dot zero Since the third and the fourth octet are changing,
I can say match the first octet completely
match the second knocked it completely since all zeros in the first octet in the wild card
means match it completely
and off. Bit in a wild card is a care bit, which means match it completely.
For the third and fourth octet, I can see I can use all ones, which is I don't care bits and I can see all ones, which makes it to 55 the third octet
and the last doctor 255 like, I don't care what goes here.
So my range becomes 30. That tender
for the tornado attend a 0.0 network. My range becomes 30 that 10.0 dot 12 30 to 10.255254 And these three addresses are included in that range. So these three Lou backs get included inside of E a G R people.
Now let's go check to see if I can see these networks on Router two or three. Let's check on Router three.
So show I p. Route E I g R P
dot a toady to attend at 8 $30.10 Not nine and $30.10 dollars. 10 networks available. Why Router one?
Now let's pretend that
I am in charge of router to a one and router one and some other admin network engineer is in charge of router 23 and four. And that guy comes up to me and say is I don't want you cluttering up my routing table with all the 30 networks.
I don't want you sending me all three networks. Could you please summarize this
and send me one network instead?
So we saw the summary ization process,
and now all we have to do is apply it.
So I go to my router one since
this side of the network, the network between rather 123 and four is supposed to see that a summary. I go to my router one
and I go to my interface connected on that land between router 234 and one,
which is fast Ethernet
interviews fast, Ethernet zero slash zero
and execute the command. I'd be summary address.
E i g R P. Then autonomous system number, which is 100.
Then the summary address, which was 30 dot Tenn 30.0.8 dot zero
and then my summarized mass, which was $255.255 to 48.0,
Now, you see, the neighbor ship was bounced,
it went down and came back up, which means this should have worked. But my previous experience has been now at work. You wouldn't have to do this on a real router, but with practice. Tracer. Since it's a virtual router, I have to shut down this interface.
Wait a few seconds and then no, shut. This is just a practice tracer anomaly that has you shut down the interface and then no *** for it to work
now. I should have this summary address that I just entered.
The 30 dot Tenn dot a 126.96.36.199
in my router 23 and four is routing table instead of the individual Lou Back networks.
Let's go to rot or two and check
show i p Route E I g R P
and See, I have the 30.8 10.80 slash 21
network in my routing table. Instead, off all three.
Let's check around or three.
Show I p Route B I. G R p.
And once again, on Router three, I see the 30 dot Tenn 30.0.8 network instead of all three. Previously, I saw all 3 30 10 98 $30.10 not nine and 30 dot Tenn 30.0.10. Now I only see the 30 dot Tenn 30.0.8 dot zero network, which is my summarized address.
Let's check around or four also,
you should once again see the 30 dot Tenn 30.0.8 instead of all three.
This concludes our e i g r P lecture