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[AUDIO LOGO]

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So now let's take a
look at summarization

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and redistribution
in IS-IS for IPv6.

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Now, keep in mind
that as we said

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at the end of the
last video, I've

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already gone through offline
and enabled all of our devices

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in all of our areas to
support IPv6 in IS-IS.

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So basically, I just added
a lot of address families

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to a lot of interfaces.

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So everything's up and
running in all of our areas,

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that's going to allow us
to do our summarization

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and redistribution.

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So let's take a look
at the topology,

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talk about what
we're going to do,

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and then we'll jump into the
command line and get it set up.

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So for this summarization, what
will be focusing on is router

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eight loopback
coming in to IS-IS,

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right now it's
coming in as a /128.

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And we'll go ahead and
summarize that as it's

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coming in to IS-IS.

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We'll look at it on
router nine up here

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just so we can see what
it looks like as it

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comes all the way through
all of the different areas.

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Then we'll do our
redistribution,

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and we'll be focusing on
redistributing between BGP

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and IS-IS here on router six.

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So let's go ahead and jump
into the command line.

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We'll start on router
nine looking at router

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eight current situation
for its loopback.

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So we'll just start with
a show IPv6 route IS-IS.

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And as we said, we're going to
be focusing in on router eight

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loopback here, which is
currently coming in as a /128.

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Well, let's go over to router
eight and summarize it.

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So on router eight, we'll
go into router IS-IS one,

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under our address
family IPv6 unicast,

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we'll do summary prefix.

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And here it wants us
to put in the prefix

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we're going to summarize too.

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So for this particular example,
it would be 2001:db8:10::

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And we're going to
make this a slash 64.

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As far as options here,
we can control which level

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it's going to summarize into--

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it's going to summarize
into level two by default.

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So we can just do
something maybe

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we want to tag this
as an 8 since it's

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coming from router 8.

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We'll go ahead and
exit configuration.

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And now that it's
summarized, let's

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go back to router 9, and see
what that route looks like now.

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So on router 9, we'll
start just by repeating

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our previous command.

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And we see that now
that route is coming

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in as a 2001:db8:10::/64.

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Let's see what it looks like if
we ask for more detail on it.

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We'll say show IPv6
route, and then we'll say

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2001:db8:10::/64.

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And here we see the
information on the route.

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Although notice, it is
not showing the tag.

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We can see the tag if
we go over to router 1.

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On router 1, we'll
do the same command.

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Show route IPv6 for
2001:db8:10::/64.

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And notice on this route,
it is, in fact, showing us

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that it's tagged with an 8.

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So this tells us that the
summarization is working.

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Now, let's take a look
at redistribution.

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For this, we'll, of course,
go over to router 6.

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We'll go into router isis again,
into our address family IPv6

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unicast.

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And all we have to do is
say redistribute bgp 100.

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We'll exit configuration.

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And let's hop on to another
router to make sure this route

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is being propagated.

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We'll just use router 7.

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Well, let's do a
show IPv6 route isis.

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And what we're
looking for here is

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we should have a 10:10 entry,
which is router 10's loopback.

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And we can see right
here that we do.

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Let's look at the
detail of that entry.

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But I want to see the
prefix attributes.

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So let's go ahead
and look at the rib

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instead of the routing table.

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So we'll say show isis IPv6 rib.

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And this is going
to be, of course,

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for the 2001:db8:10::/128.

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So, of course, what we're
looking for specifically here

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is that prefix attribute where
x is set to 1 just like it

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was in IPv4 indicating that
this is a route that has

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been redistributed into isis.

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In this video, we saw
how to do summarization

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and redistribution
with IPv6 in isis.

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And one thing that I hope
we take away from this

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is that configuring
IPv6 in isis really

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isn't that much different
from configuring IPv4 other

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than, of course, the addresses
themselves are very different.

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I hope this has been
informative for you.

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And I'd like to thank
you for viewing.

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