In this video, we get to take a look at the configuration and verification of
summarization for the IPv4 address family using OSPF version 3.
Now, as a reminder, the summarization that we're going to do uses the command
range.
That's true for traditional OSPF and also for OSPF version 3.
And we're going to implement those summaries, those ranges here at our area
border routers.
So we could summarize networks from area 1 as they're being advertised up here
in area 0.
Meaning those LC type 3s. WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
Meaning those LC type 3s.
We could summarize LC type 3s from area 0 as we're coming down here and same
treatment over here.
We could summarize from area 0 going down to area 2.
We could summarize from area 2 going into area 0.
So having said that, let's put a plan together for some specific summarization
and then we'll
implement it and test it to verify that it works.
So here's what I propose we do.
Let's use R3 as the area border router that's going to do the summarization and
let's summarize
the routes from area 0.
In fact, let's go ahead and summarize anything that begins with 10, 0, anything WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
In fact, let's go ahead and summarize anything that begins with 10, 0, anything
.
So we'll do the summary at 10, 0, 16 for area 0.
And if we do that right here in R3, when R3 is advertising the LSA type 3s down
into area 1,
instead of sending all the individual LSA type 3s down, it will send the 10, 0,
16 and it will hide
or not advertise the LSA type 3s for any of the more detailed routes that fall
under that summary.
So with that in mind, let's go to our topology, we'll do a couple quick checks
first and then we'll WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
first and then we'll
implement the summary and compare the differences.
So to start off, let's go to R5 and just verify it can see the detailed routes
for 10, 0, 13, 10, 0, 12, 10, 0, 24.
So let's go down to R5.
So we're at R5.
We'll do a show IP route for OSPFB3 learned routes and sure enough, as far as
routes to begin with 10, 0, we
have those three and then we have these four and these external type twos,
those are LSA type 5s.
So if we do a summary with the range command, it's not going to catch those WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So if we do a summary with the range command, it's not going to catch those
external routes.
If we wanted to summarize those routes, we'd want to do that up at the
autonomous system boundary
route or R1 as it injected those into OSPF. So with the range command and the
summary at the ABR,
we're just summarizing the LSA type 3s, which is the 10, 0, 1, 2, 4 and 12, 13,
24 and 34, that I'll
begin with 10, 0 and our LSA type 3. So now that we've verified they exist, let
's go up to R3
and we'll look at our topology. R3 is our area border router between the WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
and we'll look at our topology. R3 is our area border router between the
backbone area and area 1
and let's set up our summary. So let's do a show run, pipe section router and
then we'll go in
a configuration mode. We'll go into router OSPFB3, process ID1 and then further
more, we'll go into
address family for IPv4 unicast and here under the address family for IPv4, we
'll go ahead and use our
range command. So we'll say area and then we want to summarize the routes
coming from area 0. So we'll
say area 0. That's the area where the routes for about to summarize are and let
's go ahead and do 10.0.0.0 WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
's go ahead and do 10.0.0.0
and then what do we say 16? Yeah, 16 bits. So we'll do 255.25.0.0. It'll do a
space and question mark
and it says Keith, it looks great. You said range probably but you didn't type
it in. So area 0,
range, space and then we'll go to the end and then we'll do a question mark and
then we're going to
give it a cost. We can't let's give it initial cost of about 10. Great. So that
'll be the cost of
that summary route. So a moment ago down on our five, if we go back to our five
, it had a whole bunch
of these 10.0 routes that were L.C. type 3s and now if we do a show IP route OS WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
of these 10.0 routes that were L.C. type 3s and now if we do a show IP route OS
PFB3 again, those
inter area routes that started with 10.0, they are gone and they've been
replaced with this one
summary route as shown right here. So here in our five, if we did a show OSPFB3
IPV4 database,
press dinner, here's our L.C. type 1s, L.C. type 2s and here's our L.C. type 3s
. You'll notice we have
this one right here with a very short age, that's because we just made it and
that is the summary address.
So here in area 1 on our five, it no longer has the L.S.A.s for the individual WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So here in area 1 on our five, it no longer has the L.S.A.s for the individual
detailed routes like
the 10.0.12 or 13 or 24 or 34. They're all being suppressed and held back at
the area border
router because the summary is in place. So far five is going to ping for
example 10.0.12.1,
that's the IP address on gig 1.0 of R1, let's go ahead and verify which route
it would use.
So this show IP route for 10.0.12.1 and it is going to be using that summary WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So this show IP route for 10.0.12.1 and it is going to be using that summary
route right there
that was advertised by the ABR. So that'd be forwarded up to our three and then
our three would make
its own routing decision and then it forwards the packet to the final
destination. And we're going to do
a quick ping to 10.0.12.1 just to verify it works, that's a good sign too. So
now that we've had the
opportunity to do some configuration and verification with OSPF V3 for IPv4 in
the next video,
I like to present a hands-on lab for you to get your own practice doing exactly
that. So when
you're ready, I'll see you in the lab video in just a moment. WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
you're ready, I'll see you in the lab video in just a moment.