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In this video, I'm going to demonstrate how OSPF Version three routers can form neighbor relationships

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without you manually configuring IP addresses on interfaces.

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In other words, in this topology, we'll form a neighbor relationship between router one and router

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two without configuring IP version six addresses on the gigabit zero zero interfaces.

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This will demonstrate how OSPF forms neighbor relationships using link local addresses and doesn't require

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IP version six addresses to be configured or IP version four addresses.

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So in this topology, the two routers have just booted up.

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There is no configuration on the routers.

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I'll bypass the initial configuration dialog so that we can configure the routers manually.

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So the router on the left will call right of one show IP route.

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Shows us that they are no IP version for routes available on this router show IPV six route shows us

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that they are no IP version six routes available on this router at the moment.

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These routers have just booted up again with no configuration, so show IP route no IP version for routes.

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Show IPV six route no IP version six routes.

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Show IP interface brief no IP addresses configured on router one show.

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IPV six interface.

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Brief shows us that there are no IP version six addresses.

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Same on the site show IP interface brief no IP version for addresses show IPV six interface brief note

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IP Version six addresses configured.

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Okay.

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So IPV six unicast routing needs to be enabled for us to use OSPF.

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What we'll do now is enable OSPF as a routing protocol.

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The router will complain, as you can see there, that no router ID can be selected and that's because

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we have no IP version for addresses configured.

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So I need to select a router ID in dotted decimal notation such as the following.

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IPV six unicast routing.

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IPV six.

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Router OSPF one.

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Once again, we need to configure a router id.

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I'll configure the side as 2.2.

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.2.2.

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So show.

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IPV six OSPF Interface brief shows us that OSPF is not enabled on any interfaces on the rider.

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What we have to do is go on to interfaces.

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And enable IPV six on an interface.

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And then enable OSPF on that interface.

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So on this side, gigabit is zero zero.

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IPV six enable to enable IPV six on the gigabit zero zero interface and then IPV six OSPF process ID

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is one area will set to zero.

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So now show IPV six OSPF Interface brief shows us that OSPF is enabled on gigabit zero zero with a process

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ID of one in area zero.

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At the moment the state is down and that's probably because I didn't enable the interface.

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So let's do that.

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So now show IP.

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V6 OSPF interface brief.

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Notice the state is set to wait on no shut the interface on this side.

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Show IP V6 interface OSPF interface brief OSPF is enabled on gigabit zero zero in area zero using OSPF

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process one.

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The state is wait at the moment show IPV six ospf neighbor.

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We are forming a neighbor relationship with a brother with neighbor ID 1.11.1 on this side show IPV

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six OSPF neighbor.

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Notice the neighbor relationship has now moved to start and.

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Has just moved to full.

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So you can see the neighbor relationship went to full there.

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Writer one is a BTR.

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And on this side we can see that rather two is the designated rider.

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So we have formed a neighbor relationship.

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With the other rota without enabling an IP version six address on the gigabit zero zero interface.

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So notice there's no IP version for address and there's no IPv6 address enabled on this interface.

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And the same is true on the side, but.

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We do have a OSPF neighbor relationship with the other router and if we look at the routing table.

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We can see at the moment that we have a local network in the routing table but no other route exist.

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The show, IPV six rather shows us that a local address is configured on gigabit is zero zero.

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So show IPV six interface gigabit.

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Zero zero.

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Shows us that the interfaces up IPV six is enabled.

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This is the link local address on the interface.

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This router has joined various multicast groups, including two OSPF groups.

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This is all devices on the local segment.

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On the side show run interface gigabit is zero zero.

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Or show IPV six interface gigabit zero zero rather shows us the link local address on this side.

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So to prove that writing works.

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On Rata one.

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I'll configure a loopback.

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IP address.

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So IPV six address and in this case we'll call it 2001 Facebook.

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One colon.

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Colon 1/1 28.

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On this site.

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Interface loopback.

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Zero.

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IPV six Address 2001 Facebook.

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Colon.

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Colon two 128.

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Notice those are 128 networks.

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So these two are separate networks.

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Show IPv6 route.

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We have a loopback address in the routing table, but we don't see this address.

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Because we need to advertise that network into OSPF.

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So now once that network gets advertised, we should see it available in the routing table of router

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two.

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And there you go.

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We have learnt about Facebook one.

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Via the link local address of writer one.

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Once again, show IPV six interface gigabit.

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Zero zero.

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This is the link local address of Writer one, and that's the address that we are learning the route

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from.

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On the side show IPV six route.

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We haven't learnt.

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About the loopback on this side, and I think I made a mistake.

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So let me double check the configuration I made to this zero rather than a two.

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So what I'll do is remove that IP address.

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And put it back.

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As to colon.

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Colon two.

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IPV six.

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SPF one, area zero.

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Once that network gets advertised, we should see it on rather one.

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And there you go.

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The brunch is now available on Rata one.

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So we've learnt the address via OSPF.

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Let's try and ping the address.

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What do you think?

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Will it work?

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So ping.

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IPV six.

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This address.

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Does it work?

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Yes, it does.

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We can ping the loopback of router two on this side.

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Show IPv6 route.

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Can we ping?

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The loopback.

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Yes, we can.

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Notice you don't have to specify IPv6.

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The router is intelligent enough to work out that this is an IPV six ping debug IPV six icmp.

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Let's do that ping again.

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Notice we see that an echo request was received and a reply was sent.

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So again, the gigabit is zero zero interfaces of both these riders.

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Don't have either an IP version for address or an IP version six address configured.

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As soon as we enabled IP version six on the interface, a link local address was allocated as shown

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here and OSPF users link local addresses for neighbor establishment and route advertisement.

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And that's what I've demonstrated here.

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If you enjoyed the video, please like it and please subscribe to my YouTube channel.

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I wish you all the very best.