We are continuing the logical switching and you will see that inside and as its key what major feature
and how the NSA is doing the logical switching and it's one of the very important feature of NSA it's
key that white customers will choose.
And as it stands over other windows or over other product if we have same type of product who is doing
the virtualization for their datacenter why NSX has advantages and it's a huge advantage over any other
product.
So let's see that how we are it is doing the logical switching.
Now if you see any of the data center you'll find that now we have the class fabric.
That means we have a leaf spine structure.
So you have for example a spine when an aspiring to and this is find one and it's fine to suppose you
have leaf one leaf to a leaf tree for example.
So you have lift to the spine connectivity so you can see.
Let me give you one more time.
Supposedly it was fine when aspiring to suppose I have a leaf when I leave to leave will go and connect
with this.
Finally we will go and connect with a spine.
There is no connectivity in between live to live and inspired just by doing something like class architecture.
So whenever they will form any dynamic channel those channel are very much direct Bennett.
So you can refer any ECI design document or even you can refer my easier course.
But I will explain this class architecture right now here in our next realm in NSX keyword.
What is happening.
You find that mostly everything is what you are.
Even if it if it is a physical it is represented as a virtual way.
So for example here you can see that I have hypervisor hypervisor is there representing the external
endpoint.
So you have hypervisor a.k.a. for example we have dipped in a point.
So I have I've always had one hypervisor to hypervisor three like that you can see in the other leagues
I suppose I have Raekwon.
This is again just the physical representation of the virtual solution.
Something like that so frequent rate to retreat and over the rate you have hyper wages over the hypervisor
see a virtual machine.
Now suppose a virtual machine of hypervisor one that's the VM one wants to communicate with the virtual
machine that is VM 5 of hypervisor five.
So how they will communicate obviously in close architecture they will send their request or the request
will go by the control plane control plan.
I read that Okay you have to create dynamic tunnel between leaf to leaf or for example the end point
to end point to be in between type 1 2 5 we are creating the dynamic tunnel to do the communication
but in women everything will be connected with the segment or they are inside the same transport.
So you can see that the logical representation is simply that volume one wants to communicate over William
vibe with one's switch in between.
That said that's how the William where makes.
Has simplified their datacenter graphic
pattern or traffic flow to be more precise.
Just the explanation you have that we have seen and in that diagram which is not showing that courts
the controller backup up in case of a single transport.
Obviously the frame does oppose VM one of hypervisor one wants to communicate with V M 5 of hypervisor
five that frame will be flagged and we'll see that what methods we have.
But this does simplicity we have that they can go and communicate.
Now I have one note there is no detailing the benefit of any sixty or will you model is that it allowed
direct connectivity between the Transport node irrespective of a specific underlay inter rail connectivity
L2 or Rotary segments L2 or L3 segments can also be created dynamically without any configuration of
physical infrastructure so they will build create the dynamic kernel to do the communication from one
VM whose take over are installed one hypervisor to other VM on other hypervisor.
Now we can see that what is happening in case of logic traffic how they can do the communication now
that one of the we can see the drawback all for any that they are not understand or they are unable
to do the distinction between between the bum traffic light broadcast and non unique classroom take
us to all the traffic they are taking as the same type of traffic and they are flagging it Okay so to
do this to react with this flooded traffic we have actually to method for flagging traffic or those
method whose method are head and replication mode to the hierarchical modes so select see one by one
what does it mean by head and replication mode what is happening in case of head and application more
that simply the frame is flooded throughout the transport node throughout the transport and whoever
get that flood packet if that is the destination he will respond back.
Now the problem with this that you are sending the packet over all the available links let me show you
the diagram I have an idea.
So here you can see the diagram there suppose the same situation VM one of hypervisor one once you communicate
with the VM five of hypervisor five then what is happening that the frame from the VM one you can say
you can see here that it is going to this fine one spy in two so you have multiple aspects of whatever
response we are supposing I have two a spine spine one and this fine too.
So here you can see that it is going to all the hypervisor so one two three four five and then you can
see here six and seven.
So same packet you are sending seven replication or same frame has the seven replicas that he's going
to watch all the rigs all the hypervisor all Libyans in this case this is not part of transportation
so that's why we don't have any diagram here attaching this this is not part of transport so the part
of transport we can see the green arrows it is showing here so what is happening is that we are unnecessarily
over utilizing the bandwidth capability or bandwidth and that's not the picture design.
So we have the better design that is a two tier hierarchical mode give her a little more what is happening
that all the rates I suppose I have read one two three and those risks I can give different set of top
actresses.
So what will happen with that.
Let's discuss that.
So here can see it to be a hurricane more transport nodes are grouped according to the subnet of the
IP address of their tip.
So we have the grouping of the transport nodes transport node in the same rate to really say the same
subnet.
It's not mega city.
Just this the way to react to the flag traffic in the two tier hierarchical mode.
So let's see the diagram may reconsider diagram what is happening in this case that you have 10 20 30
heritage showing public IP but it can be any private against us.
For simplicity we have 10 20 30.
It should be private IP only within within the premises.
So I have three different subnet 10 20 30.
What is happening the same situation and B William one of hypervisor you want to communicate with the
VM vibe of hypervisor then in Alaska remember we have seen all the replicas of the frame.
But here what is happening and it's very interesting to hear how little more is that too.
So for example you are here and you are sending one copy to copy next to local.
So within local Rick you are doing flag I am flooding in segment local Rick but to the other lake what
is happening.
You are sending only one copy and here the system can take decision.
Either that copy can go to the hypervisor for or it can go to the hypervisor five hypervisor six is
not in the transportation so either it can go to four or five either one either it go to four or go
to five.
What is happening here that so for example ones for guard this packet and then he will send the replicated
packet to all the other hypervisor.
Okay let me try one more time.
So for example you're sending that one frame packet.
Either he can say send a system will choose he can send that frame to hypervisor seven eight or nine.
Suppose you have sent that frame to this final destination DP 7 destination to hypervisor 7.
Now this hypervisor 7 will send the replica to other hypervisor us and whoever is their destination
who will respond in this way can see that you're using only to dynamic tunnel.
Rather you are then using so for example five or six dynamic tunnel and say Hey you see we Europe the
banquet.
So for the floodgate type of traffic we should use this methodology and then 60 is recommending this
particular methodology to use because this is the optimal way to use R to handle Leaf electric traffic
light.
So let's stop here.