It on next section we're going to talk about the choice of optimization in the first lesson of Oist
OSPF optimization.
We'll discuss ferrata summarization which we mentioned earlier in more detail Roths summarization isn't
important.
Permit Taylorville ability in oil spills and helps us.
So two important problems.
The first problem is large routing tables and the second is Fred coomed elysée flu's true autonomy system.
When a route is lost in each area the is in the other area are also required to perform the shortest
path calculation route summarization can be done on the AVR or the or to reduce the area database size
with rocks summarization AB RS or s b rs combine multiple Rutte information into a single route route
summarization directly affects burn rate superior power and memory resources consumed by SBF Rodek with
graphs summarization only summarized drops are propagated into the backbone area which is area 0 and
the stability of the network is enhanced.
Here is how we can summarize the ruds on the AB are the commands we are using on AB are.
To summarize Roths is R-ALA and area ID and range.
This is the more important thing.
When that occurs then we use the IP address and mask.
We are going to take a look at example to if you want to summarize on a spear which is rather one for
this example.
The thing we are using is the summary address command this time here as you can see that we have 00
true fist into Zerah routes on the external s domain which is Jappy and if you want to summarize this
for us.
Or rather want we are using summary address and the IP address mask and that's it.
And let's take a look to the OR IS PERF virtual links right now.
Normally guys when designing OSPF each area must be associated with array or zero.
At this site like in the figure can not be down for oys belief but if areas cannot physically connect
to each other a solution can be used temporally in such a case.
The rock table of rather three and rather foreign 4 does not see or connected to the Internet interface
of rather two.
For this the virtual link between rather three and rather two is configured as shown as you can see
in our figure.
That's the backbone area area one is directly connected to here but the area too is not directly connected
to Beckmann area and it's directly connected just to area of one.
To solve this problem we need to use oil spill for all lengths and the configuration is made on the
rather tree and rather to
which I'd rather roast beef and the processed number and redefine the area of Vonne this area which
is directly connected to array's Zira on both brothers then return a virtual link
and the rather ID of the neighbor rather for other tree we're typing the rather idea of rather two and
four rather to where we are taking the broader idea of the other tree.
And if you want to verify the virtual links we can show why virtual links come at
the oil spill stop and totally substructure was up to reduce the size of the oil sphere database and
the writing table.
For example on rather one type show I peered out it can be seen that you the rug because from the now
or like this guy
are in the writing table of rather one however rather one does not need this rot it only inflates the
writing table of the rather one.
Normally we can solve this problem with the default route or etc..
But our goal is to solve with OSPF to solve this problem.
Stop Me and tour the Turby area conflagrations must be done.
Strt Bay Area.
This guy blurts type five outer space which means Alliss from external and such as a rep.
Or is it I'm sorry or ajor or something like that.
And Todos those Turby area Blur's the site three four and five Alexei's.
And let's check how we can configure the auspice area.
Let's take a look to the rather 3 configuration first or SPF configuration of rather 3 is rather OSPF
and our process number.
Then we advertise our networks and we're using area area number which is Area 2.
And stup when our we type this neighborhood when Rather tree and rather four is down unless we can figure
the oil spill stop flag on rather far and to configure the oil spill Subang rather for we are typing
the same thing.
We just type area area number and stop and that's it.
And let's take a look to the oil spill totally study area configuration to configure Toto's to the Bay
Area or rather to me which is an RV type area.
Area number and this I'm with type stuff.
No summary instead of stop but in rather for we are typing again.
Area area number and just stop.
And this makes this configurations make work area too.
As told of the East Bay area and we block the type 3 4 and 5 Elissa's in this area
OSPF the A.F. say ellos the external routes outside the austere autonomous system to be advertised in
the oil spill.
Autonomous them asap or is found in NASA say an external works flew the NSA with ESPERAR type cell analysts
say the emir which communicates the NSA with the other areas does not allow the transmission of type
cell analysis it receives and coerce them into Type 5 Eliseus and transmits them to the other areas
allowing the oil spill Otome system to the external networks of the other areas.
And here is how we can propagate a default route in oil spill.
If you want to propagate a default route in oys pair of with type brother SBF and process number.
And here is the command for propagating default information and originate propagates or default route
to other guys in or SBF domain.