Now your job is to do what propagate to provide to a to do for what can we learn?
Run here.
What kind of ship will run here?
What kind of neighbor ship you would run here?
Again I bgp right.
Again I BGP.
So let me go and configure BGP between three and four on this ten 134 link.
Okay.
So let's go to three.
Thereafter BGP minus two three for neighbor ten .1. 34.4.
Remote as 234.
That's it.
I'll go to our for.
I'd say probably two, three, four, maybe ten or 1.30 4.3.
Simultaneous two, three, four.
Right.
And the naval ship is back and they are doing this with a handshake.
They know each other.
The routing table.
They can.
I set up a session.
So yes, the neighbors are for now and if I c show IP BGP summary.
So after we'll have a neighbor ship with r three and here we go.
Membership is listed as blank, so it is established.
Likewise, if I go to three and verify show IP BGP summary, I would enable ship with R first.
Good.
With our power as well and the status blank once it is established.
All good so far.
So now what will happen?
Look into this.
Let's start from number one.
This is BGP advertised, this particular prefix as an BGP update to this web.
OC What was the what was the prefix one, 92 and 11?
It was really connected here.
It was marked as best because.
The next drop.
Next up is all zero, right?
Zero.
And what is a path?
At our one plant right locally you don't have the spot.
But when our one gave it to R two as an EVP, when our two kept it 11 and 192, this two network what's
what what was the next top ten .1.2.1 and what's my path 100?
When are to give it as an BGP update to our three.
But then with the next top shelf feature, right?
With the next top shelf feature with that enabled when Archie received 11 and 192, what is the next
top?
He got 23.2 and the as part is same 100.
Now you have established what membership again here.
So you know that if this route is marked as.
What prelude and best this could be propagated to the next neighbor.
Right.
That means you think that Apple will get the update right now.
That is as of now or will not get done.
Why?
Because there is a BGP to.
We call that as a BGP split horizon rule.
So I received an incoming BGP update.
An incoming BGP update.
The rule says this cannot be forwarded to another BGP peer.
Okay.
So if I'm a reporter.
And if I have an IVP neighbor ship site on that site, if I receive an update inbound from my BGP neighbor,
I can not forward it to another BGP neighbor.
It is used to avoid something called us routing loops.
Now, don't ask me at this point of time how routing loops will happen with respect to BGP and all the
stuff.
It needs a serious discussion later, but as of now you just need to know that if I have a router sitting
kind of a middle order where this side and this said they have BGP neighbors configured.
If the middle daughter receives an BGP update on one direction, he cannot give it the received update
of BGP to another BGP neighbor.
This is not possible.
By default.
This is not possible.
Okay.
So what you should do now if after is not getting the suffixes of BGP can are five get it not possible.
So I need to have I need to make sure that this router gets the BGP update.
Right.
So I'm having a very, very, very big problem over here that although I have an IPG enabled ship made
between RS 3 to 4.
But as for this BGP rule of BGP specialization rule, it says that incoming BGP update cannot be given
due.
Another BGP peer in another direction.
So let me show it to you.
Let me show it to you.
So if I go back to our three hour, three has the update.
I will see this issue IP BGP it has update 11 192 it knows we are not are to as an X stop that's fine
and our three if I c show IP BGP summary, it is enabled with r four as well.
Which is our for.
So if I go to our for.
And if I see show IP BGP, I don't have any updates in the BGP table.
Smartphone is not having any update.
You cannot propagate it to our five.
So now what should I do?
What do you think is?
How can I resolve this problem?
There are multiple ways.
I just need to check if you guys can help me out with something.
What is.
What is the problem here?
The problem is running BGP here.
I BGP here, i BGP here.
That's fine.
Problem is, you receive this update as BGP gave it this as an BGP tool here.
No issues still here.
No issues.
But you cannot forward it to this way because an incoming BGP object cannot be given to another GPO.
If this guy is not having the route, you cannot go and give it to five.
So what I need is I need a concept of.
And elegance of colors.
Full match.
IBP adding.
I need this concept right now inside my BGP domain, inside this BGP domain.
I would need something called as a full mesh VPN.
A word or two has come up with three, three, four, four.
Now I want our two and our four should negotiate with each other.
So that case it is called a full mesh field measurements.
But all the routers insert IGP is every neighbor ship with every other office in that domain.
So what will happen now if R2 is learning this update as BGP from R one, it will generate two copies.
One copy.
He will give it to three and one copy.
He will give it to whom?
After while doing so.
Make sure you do this.
Next up self write for this neighbor.
Make sure you do next op self.
Otherwise what will happen next job will be still kept as this IP address which you won't be able to
reach.
Okay.
So when you say next top shelf it will be kept as this IP so after would know ten 123 network using
what SPF this IP would be reachable.
Right.
So next up, self is important.
So what I would do is do this configuration colors would match up I would in.
Let's do that.
Now, when I go to war, to have to.
To negotiate with are for.
So my job is BGP.
My -- is to be for my neighbor is what are you?
Ten .1. 34.4.
And I know how to reach this neighbor because I know OSPF And also this neighbor is within limit of
divides, right?
So I can read this neighbor within total hops of what, 55 hops, as simple as that.
And this is remote.
So what, two, three, four.
Done.
And of course, what this neighbor.
Ten .1. 24.4, I should say.
Next top steps.
This one is important.
Likewise.
I'll go to our four.
Let's go and set our BGP misses to three for the neighbor ten 1.23.2.
Even more basis to people than let's let the established is enabled.
So we are two, two or four.
We have the neighbor ship right now for BGP.
There we go.
And if you see IP, BGP, somebody right now, you'll have two neighbors.
One is your R3 and one is your R2.
And if you see Schwab BGP now the BGP table last time that I was not there with are four.
Now you are receiving this route.
And it is coming from hour to an hour to hashing.
The next topic to itself is what is 100?
And it is marked as best because this is reachable via USB.
This next stop is reachable via USB.
There is a reason it is marked as best.
If it is marked as best, two things happens.
First of all, this route goes to my routing table.
I pull it out.
I have this note as BGP routing table with BGP as an add value of 200 plus.
If I have enabled ship from after two or five.
I can propagate this route to our files.
So now what kind of neighbor I should have?
Between four to or five?
And if so, let me do that.
Let me go to our four.
We'll do our BGP mitosis two, three, four.
My neighbor is ten 1.45 five.
Simultaneous is two, three, four.
Similarly, I will go and configure five.
Let's see if our BGP mitosis 100 neighbor is standard 1.45 for remote basis.
Before then let establish the neighbor ship.
On the connected link that establishes the BJP membership.
Back to the message shortly.
Yes.
So let me figure.
IP BGP some of.
Despite being ten 145 for it's good.
But this router is creating some problem here.
It's the wrong --.
No rotor GP.
What is I give you?
Do show IP protocols with BGP 500 here.
If they cease to cheer for.
BGP.
Read more cases 34 and 35 for ex-wife.
I think on our for I gave it some I have some problem there.
You.
Oops.
Sorry.
It should be.
What?
500.
I have given this.
You can just check that out.
Then one, two, three, four.
After I told her this IP is situated on a number two three for the Roto-Rooter BGP.
My SS two, two, four give.
You can see that this was a mistake from a.
No to this membership.
And you should say neighbor.
And .1.4.55 remote basis by.
And wait for the issue to come up.
Should be coming up shortly.
Between four and five.
And here we go.
The membership is up.
Now when you propagate the received BGP update to another BGP, that's not a problem at all.
That means you received right now this 11 and this 192 as an IGP update, it is marked as best for you.
So that said, you have got an IGP enabled ship.
You can forward this update to this guy.
When you forward this, you automatically you will change the next stop IP, which will be ten .1. 45.4.
You'll do that automatically and the as part what you would inform will be like you'll be informing
that you have to reach it from this is and is 100 is where it is advertised.
We will have like is two, three, four and is 100.
You will tag your own as and we'll will give it to him so that out of five knows that this particular
prefix 11 192 is located after two as hops.
So if I go and verify that on our five.
So IP BGP summary first of all, to see the membership I have never with it for just good IP BGP.
I learned 11 and 192.
And it does over my next job.
I know how to do this next stop.
So our five knows what we send.
145 four because it's directly connected and we have got to jump to a spot is 108 is 234 as a transit
is.
And this store would be dead inside.
Look.
The BJP's routing table.
Right.
New Zealand has learned us BGP so they got change to 20.
The basic overview of it, how it works.
And this number is having a range from 126465535 on the older code.
On the newer code, the is number is of four bytes, which is got a larger value.
The subject of BGP is really was the more and more you learn I mean.
See you can work as a ISB administrator, as an engineer at ISP level if you think that BGP only BGP
OC.