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