So far we have discourse about Tier 1 voting in this election we are going to discuss about two tier
architecture.
Now this is actually recommended from William where they can use two tier architecture.
Why.
Because this will be easier for the providers to simplify the routing and other services.
While it will be easier for the tenant managers on management whose managers are the administrators
who are managing the tenant to manage different type of tenants to manage the tier one.
Correct.
So let me quickly show you the diagram you.
What I tried to explain here and by the way this is not a mandatory design but this is recommended from
the here and see that you have Tier 0 Gateway and then you can manage easily the loadings external loadings
and the services and then you have the Tier 1 gateway that can manage the tenants.
Alright so let's quickly see that.
What are the capabilities we have with the Tier 0 and Tier 1 gateway.
Here you can see that Tier 0 Gateway they have connected interfaces now.
So for example you have Tier 0 Gateway.
It can be connected with the external world.
It can be connected with the overlay.
It can be connected with T1 correct.
So arrogantly that it has the overlay and the connected segment it can be connected with the service
interface.
It can be connected with the outside okay.
Now it can do the static road.
It can do the BGP it can do the NAC IP.
It has the IP say local IP.
It can be configured DNS forwarding IP it can configure.
So these are the services routing plus services we have in Tier 0.
Now in this diagram it will be very much clear.
So let's start with the year 1 see their tier 1 has the service interface who's having IP of it is connected
with the violence segment.
Who's having IP of 1 2 1 6 8 10 not 0.
Then it has the overlay segment having IP 172 once extend out zero.
So what is happening here that the Tier 1 having two connected interfaces will they have the services
and the overlay so that we can see that deviancy to and connected these two IP addresses they are getting
advertised to the as you know here you can see it in the red one default around with the next hop IP
as 164 2 to 4.
In between this link is auto installed on Tier 1 as soon as connected with years.
So how Tier 0 is seeing Tier 1 out is where the gateway.
Now let's see this particular nodes that 172 and 192 are seen as Tier 1 connected to T1 see the key
as you can see that all this T1 zeroes apart from that he has his own roads.
So what is on those 172 ones 620 and 192 ones 1 6 8 2 4 0 next extend and load.
So now he can see that he wants it out now he can see the t 0 sit outs T1 connecting zero connected
out now in the third reich Americans see another T Zero Gateway redistribute these zero connected and
T1 connected roads inside BGP to provide North South so you have the D zero connector you have the key
one connector.
Now you can use BGP and you can redistribute these roads to the external world okay.
That's the complete mechanism we have now quickly go and check the Tier 1 features the deal and support
is things we have so they have the connector doubts we have discussed what this strategy now they can
configure the NAC APIs there the Lord Whelan's whip feature the Lord balance is next ABC Local IP and
DNS forwarding IP.
So these are these supported her routing and the service features in Tier 2 architecture it's not mandatory
but we in various recommending that you this type of model and this is very much a scalable and supporting
most of the feature that we have to list the scope here.