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In this video, we get to walk through the summarization at the ABR regarding a

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set of networks.

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So I propose as a demonstration, let's go ahead and let's use R3.

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And at that ABR, let's take all the routes.

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And again, with IPv6 freezing, 2001, DBA6783.

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And then the X right here represents the actual subnet identifier.

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Let's go ahead and take any routes that begin with 2001, DBA6783,

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that 48-bit address space. And let's summarize those into one route as we
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X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000

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that 48-bit address space. And let's summarize those into one route as we

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advertise them up into Area 0.

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So before we do the summarization at the ABR, Area 0, like on R1,

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should be able to see the detailed routes for the 35 subnet, the 57 subnet, and

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the 7 subnet.

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And after we're done, it should only see the one summary route that covers

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those address spaces.

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And the syntax is very similar to what we did in OSPF version 2.

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We are going to go ahead and use the range command.

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So what we'll do on R3 is we'll go into router configuration mode for OSPF

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version 3,
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version 3,

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for process ID number 1.

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Then we'll go into the address family for IPv6.

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And then in that address family, we'll say Area 1,

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and that's my little symbol there for a space.

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We'll put a space following Area 1.

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We'll use the keyword range space there.

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And then we'll put in our summary address.

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So if we wanted to summarize anything that fell within 2001,

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DB8, 678, 3, with a slash 48, which represents those first 48 bits, after that

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summary is in place,

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up here in Area 0, all they should see is that one summary,
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and they wouldn't no longer be able to see the actual detailed routes of 35, 57

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, and 7.

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So that's our game plan of what we want to accomplish.

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Let's go ahead and check the before picture.

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We'll implement our summarization here on R3,

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and then we'll compare the results to what we saw before.

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So here we go.

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Let's go ahead and do our before comparison.

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So we go to R1, and we do a show IPv6 route.

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And we'll go ahead and tack on OSPF for OSPF learned routes.

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Here is the 35 network between R3 and R5.

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Here is the 57 network between R5 and R7.
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Here is the 57 network between R5 and R7.

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And here is the 7 network that's hanging off at gig 00 on R7.

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So to create the summary, we'll go to the right router.

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So let's go to router 3.

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That's our area border router.

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And on R3, let's go ahead and do a show, run, pipe, section router.

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And then it'll save us a little bit of typing.

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Then we'll go into configuration mode.

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We'll go into router OSPF version 3, process ID1, by pasting that in.

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Then we'll go to our address family for R5,

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365 unit gas, by copying that, pasting it in.

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And now in the address family configuration,
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And now in the address family configuration,

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here's where we specify our summary.

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And let's say area 1, space, question mark.

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And we need the range command, as shown right here.

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So we'll type in range.

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And then we'll specify the range which we want to summarize.

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So let's go ahead and let's use 2001, colon, db8, colon, 678, 3.

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And let's just go ahead and use those 48 bits.

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So I'll put a colon, colon slash 48, and press enter.

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So now anything begins with these 48 bits.

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2001, db8, 678, 3.

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Again, those are hexadecimal representations of the binary behind it.
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X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000

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Again, those are hexadecimal representations of the binary behind it.

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A thing that matches that is going to be suppressed and not advertised.

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But instead, just that one summary will show up in the other area.

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So we're summarizing from area 1.

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So let's go back up to router 1.

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Where a moment ago, it could see the 7 subnet.

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And it could see the 57 subnet.

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And also the 35 subnet.

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So now we hit the up arrow key.

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And do a show IPv6 route, OSBF.

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Now notice we have a summary route right here.

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That's been advertised by our ABR.

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That's R3 of 2001, db8, 678, 3.
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That's R3 of 2001, db8, 678, 3.

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Slaps 48.

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And if we go to the end of this,

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you'll notice we no longer have the more detailed LSA type 3s.

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And as a result, we no longer have those more detailed

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inter-area routes.

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So if we look for the 35 network, it is not there.

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There's 34 and 35 would be right below it.

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It's not there.

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There's no 57 network.

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That'd be underneath 46.

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And there's no 7 network.

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And that would be somewhere between 4 and 8.

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So those three more detailed routes have now been suppressed.

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Because we're doing summarization at the area border router.
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Because we're doing summarization at the area border router.

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So another way we have the opportunity to discuss,

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configure and verify many aspects.

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We're going OSBF v3 for the address family of IPv6.

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In the next video, I'm going to put you on a hands-on lab

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so you can get your own hands-on practice.

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I'll see you in the next video when you're ready.