This second choice by design we are going to take a look.
Is Malte aria or OSPF
Matsuri or SBF which is a way of limiting the amount of neighbors in an area is also at design option
for the OSPF by using material as if we are having small Luling state database and routing tables and
we are making Reier SBF calculations.
This design is suitable for suitable solution for large networks to degrees.
Processing our hath as you can see in here we have multiple areas in here and there area of 50 and the
area 60.
And each area is connected to areas zero which is backbone area by an area border rather each additional
area in OSPF domain must have a connection to the oil spill backbone area as I told you and such connections
are maintained by an interconnecting rather known as an area or border rather or a B R and AB are maintained
separately in state databases for each area it serves and maintains summarized routes for all areas
in the network.
For example if the link between rather eights and the rather nine is down area burder rather which is
rather two for this area isolates the fault.
So just the area of 50 is effected from failure and makes SBF recalculation.
Let's go ahead with the auto system boundary rather which is a spear and alter them System bonder rather
is rather that is connected by using more than one running portico and that exchanged routing information
with others Altan them System A is B is typically also run an exterior running Portico for example such
as BGP or use static gruts or both.
And a spear is used to Disturbia routes received from either external autonomous thems through its own
autonomic system.
And here is the OSPF LSA types.
We have seven types of the OSPF ls.
The first elicit type is the rudder elysée and this Elisei is generated by all routers to describe directly
attached links.
This second elysée is network elysée.
And this elysée is generated by dir to describe the neighbors connect to that segment.
This second third and fourth ELAS these are the summary I will say.
And these guys are generated by a beer to describe arrow to a spear to neighbors outside the area.
Type five elysée is the external the say and they are generated by a spear to describe broths to redistribute
it into the area.
The sixth is the multicast elysée and used in multicast or SBF.
And this is not supported in Cisco devices.
And this seven elysée LC type Selam is the NSA external elysée not so Stobie area and generated by an
air or inside an NSA area to describe Rudds redistributed in the not so slobby area.
Let's go ahead with the oil spill from table review.
As you can see here to display the oil spill of us for the rather for we're typing show I ping rods
and or Espey of command and we have some entries in here as you can see we have some keywords which
are I a or some Leather's like all in here and they mean all means for example the oil spill SPF I a
means the sear a make it also CD you and it to as you can see in here.
And these guys are the thoughts redistributed into the area.
This go with the oil spill from summarization in an OSPF design just a B or and a and b or others can
summarize the route's guys.
OSPF entery route summarization and as I told you AP US can summarize the rods between backbone and
the other areas.
And as you can see and as an example in here we have two separate works and they are 10:41 one zero
and 10:41 to zero and slash 24.
As you can see in here and rather true for example which is an AB or is representing destructs by using
a single drop which is from 41 0 0 slash 20 to
is beares also can summarize in or SBF true.
And as Pierce can summarize many Excello runs into one Lincs the advertisement and let's go ahead with
the configuration of the model Turiya or as Peter to configure Ramal Turia OSPF Kreiss we are using
these commands as you can see in here for example or rather to configure the O S and we're typing rather
OSPF and the process number and hitting the enter key then we are in the coffee grinder mode anymore.
The first thing we should do is defining our rather ideal first.
We are defining a rather ID.
Please pay attention.
Remember that as I explained you on our previous slide this is not an IP address or something like that
we are defining a Radway the mostly we are defining these guys similar to our other names for rather
to we can use the 1:58 to mostly but that is arbitrary but in most cases we are using like that.
And then in the third step we're defining our network statements for example.
This guy is rather too is connected to these two networks as you can see them 41 50 zero Slish 24 and
65 10:41 26 zeros slash twenty four with two networks.
As you can see here and we are defining these netbooks that months for example Network 10 14 15 0 with
the wildcard mask of 0 0 0 that 255 because of we're using slushed 24 which means 255 255 2:55 that's
zero.
And if I can if I can work this to the wildcard mask that's the one cat Mackoff the cement mask 000
71 2:55 and this work belonging to the area or 15 area 50 I'm sorry.
And and Taiping the area of 50 with the same logic as you can see we have another network connected
to the other two this network is in area zero.
And we are tapping network and the network ID 10:41 7:34 zero.
And because we're using slushed 24 again the wildcard mask will be 0 0 0 255 and area will be the area
0.
So let's go ahead with the multi-grain OSPF version 3 configuration 2 configuration known as P.F. version
3.
We need to get into the interface mode separately and we need to activate the oil spill for each interface.
For example 4 gig 0 0 we have this network in here.
82 10:41 XPS 50 0 and 4 Gigs 0 1 we have this number again here.
And but we're not using the network IDs in here.
What we are doing just for actuating the and 2006 wording under the interfaces.
By using the IP version 6 or SPF the process number command and we're typing the area and the area number
and that's it to configure route summarization or then AB our guys we are we're using the area arr.
command for example for rather to you find one to configure route summarization.
And if I want to summarize these two guys by using as single network which is 10:41 0 0 sledged 22 the
command line using is the area range command.
OK.
I'm you I'm typing on rather to area 50
range then I'm typing the summerize draft them 41 0 0 with the subnet mask or to reverse 255 2:55 to
return to that 0.
OK.
That makes the summarization for us to where Fido is piff version 2 and as before and through each configuration
we can use the show IP port of call soybean route.
Sure if you are SPF Sharpy OSPF neighbor interface and the database commands.
Please keep in mind that we should use IP version 6 instead of IP to wait for ID or SPF persion 3 configuration
for example show IP version 6.
Instead of show IP route.