In that section we're not taking you to the O S peer protocol.
Let's start with the oil SPF over we all the shortest path OSPF is an interior gateway particle IGP
and commonly used in large enterprise networks OSPF is a link state routing protocol providing thrust
Colewort Jones and excellent scalability to find the best path OSPF uses Dykstra algorithm and uses
the cost value as the metric OSPF has fast convergence and an administrative distance volleyer of one
hundred and ten.
Let's go with the OSPF components in an oil spill running rather.
We have three main tables and they are our neighbor table topology table and the routing table neighbor
table kips the list of directly connected to and always be affronting neighbors.
For example in the neighbor table of rather one we have the information or through other two and the
rather tree and in the neighboring table of the other three we have the information for the other two
and the other one and the topology table kips the topology map which lists all possible paths for destination.
For example in the topology table of through other tree to reach this network we have two options as
you can see and they are few from here and from here and all these guys will be in the topology table
and we have also the running table which keeps the best paths for the destination version.
And as you know we have two options to reach here from the other two out of three and they are huge
and here and one of this guys this guy or this guy will be selected as the best throughout and will
be installed into our writing table.
We have two types of OSPF design and there single area and multi-layers SBF in a single area network.
All were others belong to just one area and that is mostly the backbone area which is areas zero.
This kind of design is suitable for small sized networks mostly as you can see in here we have the aerial
zero which is the backbone the real backbone area and all routers are built in the area to area zero
as you can see the secondo SPF design option is Monterrey or SBF in this design we have more than one
areas and other areas must connect to to orea zero.
This design is suitable solution for larger works.
Two degrees processing the overhead as you can see in here we are area 50 0 and areas 60 and other areas.
Each area is connected to the area zero for example area 60 is connected.
Two areas or by using rather three which is an area of border rather and area 50 is connected to area
zero.
By using the rudder 2 which is an area about the other again an area border rather a B or is a kind
of rudder that is located near to border between one or more oil spill areas.
It is used to establish a connection between backbone area and the other was bay area as its a member
of both the main backbone network and the specific areas to which it connects.
As you can see in here we are two area of border others and they are rather two and there are other
tree one interface of through other 3s in backbone area and the other interface is in the area 60 and
one interface of the rather two in the area zero and the other interface is in the area 50 and these
guys are known as the area border rather lets go ahead with the OSPF Peck types.
There are several types of packet's exchange between oil spill for others to provide communication each
other and they are.
Hello there the base description links that request link state update and links that acknowledgement
Hello packet discovers the other voice bespeaking Browder's on the common subnets and declares permit
theirs on which two others must agree to become neighbors.
Hello Pickert are also used to elect deer and media or rudders and Sandt as a multicast to two hundred
and twenty four.
0 0 5 4 IP version 4 networks.
Please pay attention that hello.
And that intervals must match on boat rudders to establish air adjacency between each rudder for internet
links.
Default Hello interval is 10 seconds and the dead interval is 40 seconds.
But these intervals can be modified with the commands as you can see in here.
For example you get into the interface mode and you can define a new hello and that interval time.
For example let's say that we have two others rather one and rather two connected to each other.
And as you know the default Hello timer is 10 seconds for this interface.
Let's say that we are sending Kallos for each 10 seconds rather two and this guy is also sending help
packets each 10 seconds.
For example if I change the hello interval in year to 5 the OSPF neighbors shift between Rather one
or rather two fails immediately.
If I change this guy's Hello interval to 5 seconds to the neighbor ship will come back.
Let's go ahead with the DVD for the links that routing protocols.
It is essential that the links to the database for all the others to Moine synchronized this synchronization
will begin as soon as as an edgy sincere form but when the neighbors or SBF uses the DVD Packards for
the purpose after DPD pickets exchange process do rather may find that it does not have an up to date
database.
The Elazar packet that is used to request pieces of neighbor database that is more up to date of packet
used for sending specifically requests that links state informations which are requested by LSR.
LS You Packards can contain one or more.
LS As always of records the acknowledgment for the receipt of each Elisei multiple Eliseus can be acknowledged
in a single LSA packet.
Let's go ahead with the router.
I determine the choice of rather ID is used to identify a specific device within an OSPF database and
must be unique to prevent unintended or SBF database problems.
Guys keep in mind that while their ID is not an IP address and is not part of any ridable subnet in
the network rather ID is determined as you can see in a year.
First you can define your rather ID by manual configuration on the rider.
Secondly why is IP on a loop.
Big will be selected as the rather ID and third highest IP owner.
None loopback interface will be chosen as a rather ID lets go ahead with the OSPF network types.
We have point a point that works which is a direct connection between two others.
As you can see here we have broadcast multi multi access.
Yes there is a connection between multiple rodders over an Internet network.
As you can see in here we are MDMA.
None bull non-broadcast multi-axis.
There is a connection between multiple rodders again but all were err and answer over x twenty four
five or Frahm relay Network point to multipoint is a connection for multiple rodders over and MDMA with
a hub and spoke says you can see here we're Hobsons boards and we have also virtual links which are
used for connection to backbone area.
If there is a physical problem let's go in with the oil spill designated Grada turn luch look clarionet
works then men are riding devices can produce heavy control traffic as links.
Advertisements are fluted across the network as you can see in here.
OSPF as their signal routes Brodeur's are the collection points are of Eliseus and used to alleviate
the potential traffic problem on all multi-axis networks broadcast and the NBN may be their backup designated
rather is elected.
In case designated RR Grodner fails none the are and none BT or others are known as the DA or other
Durer other dear brothers communicate with the DEA or others or multi-course by using 224 0 0 5.
And please pay attention that is that's an important point.
Every other established fool Edisons the only with the DVR and the BTR it stays in the two ways it with
all other neighbors.
Let's go ahead with the election process in the election process rather with the highest interface.
Priority is elected.
TR And the second highest is the media.
If there is a tie at the interface priority rather with the highest rather ID is elected dier and the
second highest will be DDR and the boot up sequence influence the election process.
We can also change the interface priority by using the IP OSPF property and we can define a property
value for the interface
between rodders Atlanta methods can be used for OSPF security and we have two types of authentication
which are simple password and the and the five in simple password a thumb staycation password is sent
as plaintext at update message and in the M.D for Everton occasion passport is that mean by default
algorithm and that is the most secure method.
And here is the configuration for the end the five ways.
End the five core authentication can be globally enabled for all interfaces or can be configured on
a per interface basis as you can see here.
For example if you want the enable it we are getting into the oil spill.
I'm sorry we are getting into coffee rather more by typing rather OSPF and the process number then we
are typing areas 0 often cation.
Message digest.
Which means I'm going to use message digest upon occasion for the area zero.
Then we can get into the interface mode and we can use the IP or SPF message that is key and the key
number will be in the 5 and our key will be network.
For example an Let's go with the single-A area or SBF version to configure it.
Let's go ahead with the network command network command is used to activate OSPF underspecified interfaces
specifying an interface with the command will include the interface into the OSPF frowning process for
example to configure no SPF in here.
We are typing rather ROIs P.F. and we are choosing a process number.
Then we are typing the network statement as you can see and we are using the wildcard masks and the
area keyword and the name of the areas you can see.
Let's go with the passive interface comment.
The passive interface command is used to disable sending updates out from a specific interface or SBF
does not send help packets on interfaces configured with passive interface Kamat passive interface command
is security an efficient use of sources such as bandwidth.
For example in rather one as you can see in here we are typing a passive interface command passive interface
gig 00 which is this interface.
And that means we're not going to send Telapak Telepictures from here OK do we need to you do we need
to send hello packets from this interface.
Actually no because we don't have any brothers in here to form and neighbor ship let's go with the OSPF
cost OSPF calculates the metric with cost value.
You can find the cost by dividing the referenced bandwidth to interface with the According to the default
or OSPF of metric cost Vallecano calculation the default OSPF cost for fast Internet interface for example.
As you can see here and the gigabit ethernet interfaces are assumed to be the same.
And there seemed to be just one for example if you want to check the cost you can use the show IP or
OSPF interface and the name of the interface and you can see the cost of the gigabit ethernet interface
as one to verify the choice of neighbors we are using the show IP OSPF neighbor command for example.
Or rather one.
If we tightly show IP OSPF name command as you can see here we are seeing the rather ID of the rather
two which is 2 2 2 2 and we are seeing the State of the neighbor ship which is a full state and we're
seeing the IP address of the remote site and we are seeing the interface that we are forming the neighbor
ship our ok to fight the OSPF portico.
We can use the Shway people of course command and we can check the oil spill.
And the process number and we can also see we can also see that if there is an outgoing or the incoming
filter or not we can check the rudder write the values and the numbers that we are running for.
Let's go with the singularly OSPF version 3 configuration with a spear version 3 is the worst beer version
that supports the IP version 6 to make IP routing IP version 6 must be enabled on rather with IPV 6
unicast Walding command.
Firstly And here is the configuration for the OSPF version 3 to configure and OSPF version 3 but we
rather one and rather two on rather one we should make these configurations for example.
The first thing we should do is enabling the IP version 6 running by typing IP V-6 unicast routing.
Then we are typing.
I PVC's rather OSPF and the process number them we are getting into the coffee rather more as you can
see and we can define our rather I.D. in this Maut then what we can do is we need to get into the interface
mode.
And we need to type I previous six I'm sorry in here IPV 6 or SPF the process number and the area and
the area number two way fight OSPF version 3 neighbors.
We are using again the show IP OSPF Nabl commands and we can check the neighbor ID for example.
That is the wrong thing.
I think that would be too true too true for this scenario and we can see the stay the timer interface
informations again.
And we can also use the show IP version 6 porticos command and check the output for the work for kasian
of the OS be a version 3.