1
00:00:00,000 --> 00:00:03,824
[AUDIO LOGO]

2
00:00:03,824 --> 00:00:07,180

3
00:00:07,180 --> 00:00:09,940
So now it's time to jump
onto the command line

4
00:00:09,940 --> 00:00:15,970
and actually configure our IS-IS
environment to support IPv6.

5
00:00:15,970 --> 00:00:18,460
Now as we jump in
here, we're going

6
00:00:18,460 --> 00:00:22,570
to see that this is just as
easy as enabling the address

7
00:00:22,570 --> 00:00:26,150
family under the
interfaces and the process.

8
00:00:26,150 --> 00:00:32,020
So we'll take a look at this
in iOS XR as well as iOS XE.

9
00:00:32,020 --> 00:00:34,270
So once again, let's
bring up our topology

10
00:00:34,270 --> 00:00:36,800
real quickly just so we have
an idea of what's going on.

11
00:00:36,800 --> 00:00:38,530
And then we'll jump
into the command line

12
00:00:38,530 --> 00:00:44,880
and get IPv6
configured for IS-IS.

13
00:00:44,880 --> 00:00:46,710
So for this
demonstration, we'll again

14
00:00:46,710 --> 00:00:51,060
be on IS-IS IPv6 6 Topology 1.

15
00:00:51,060 --> 00:00:53,670
And we're going to be
using the same basic area

16
00:00:53,670 --> 00:00:58,210
structure that we used
in our IPv4 skills.

17
00:00:58,210 --> 00:01:02,790
However, clearly, these are
now running IPv6 addresses.

18
00:01:02,790 --> 00:01:06,720
We want to look at our
configuration on both iOS XR

19
00:01:06,720 --> 00:01:08,760
and iOS XE.

20
00:01:08,760 --> 00:01:10,590
So we're just
going to focus here

21
00:01:10,590 --> 00:01:13,260
on looking at the
configuration on router 1

22
00:01:13,260 --> 00:01:15,870
which, of course,
is running iOS XR,

23
00:01:15,870 --> 00:01:21,600
and then also on router 6, which
is, of course, running iOS XE.

24
00:01:21,600 --> 00:01:23,370
So let's jump into
the command line

25
00:01:23,370 --> 00:01:27,600
and get IS-IS configured
for IPv6 support.

26
00:01:27,600 --> 00:01:30,040
We'll start on router 1.

27
00:01:30,040 --> 00:01:33,850
So let's begin here on
router 1 with a show IPv6

28
00:01:33,850 --> 00:01:37,780
interface brief just to
verify which interfaces

29
00:01:37,780 --> 00:01:40,480
are, in fact, running IPv6.

30
00:01:40,480 --> 00:01:44,830
Now here's the interesting thing
about configuring IPv6 support

31
00:01:44,830 --> 00:01:46,660
in IS-IS.

32
00:01:46,660 --> 00:01:49,370
We have to go into
configuration mode, of course.

33
00:01:49,370 --> 00:01:52,600
We go into router IS-IS 1.

34
00:01:52,600 --> 00:01:55,580
We go into our loopback
interface, for example.

35
00:01:55,580 --> 00:01:58,690
This is our first interface
we have that's running IPv6.

36
00:01:58,690 --> 00:02:03,910
And we simply say, address
family, IPv6 unicast.

37
00:02:03,910 --> 00:02:04,850
That's it.

38
00:02:04,850 --> 00:02:06,430
That's all we have to do.

39
00:02:06,430 --> 00:02:09,220
We then go into our
other interfaces,

40
00:02:09,220 --> 00:02:12,290
and we enable the address
family for those as well.

41
00:02:12,290 --> 00:02:17,600
So we need gigabit 0,
gigabit 1, and gigabit 3.

42
00:02:17,600 --> 00:02:22,300
We'll commit our changes,
exit configuration mode.

43
00:02:22,300 --> 00:02:27,100
And we can verify by
saying, show protocol IPv6.

44
00:02:27,100 --> 00:02:29,680
And what we see
here is that, IS-IS

45
00:02:29,680 --> 00:02:33,550
is, in fact, enabled for IPv6.

46
00:02:33,550 --> 00:02:37,360
So there's really nothing
more to configure in IS-IS,

47
00:02:37,360 --> 00:02:40,840
then enabling this
additional address family.

48
00:02:40,840 --> 00:02:44,350
We can also see here
on iOS XR, since it's

49
00:02:44,350 --> 00:02:46,750
listing these
different topologies,

50
00:02:46,750 --> 00:02:52,870
that iOS XR actually defaults
to multitopology support.

51
00:02:52,870 --> 00:02:55,600
So now let's go
configure router 6.

52
00:02:55,600 --> 00:02:57,280
The first thing
we see on router 6

53
00:02:57,280 --> 00:03:00,430
here is, it's already
complaining about its adjacency

54
00:03:00,430 --> 00:03:03,880
to router 1 because the
topology has changed,

55
00:03:03,880 --> 00:03:06,810
but this router
doesn't support that.

56
00:03:06,810 --> 00:03:09,710
So the first thing, of course,
we're going to have to do,

57
00:03:09,710 --> 00:03:16,610
we'll go into our interfaces and
simply do IPv6 router IS-IS 1.

58
00:03:16,610 --> 00:03:19,820
This is how we enable
this on iOS XE.

59
00:03:19,820 --> 00:03:24,440
Again, we need interface
gigabit 1 also here on router 6,

60
00:03:24,440 --> 00:03:27,600
and then we can exit out
of configuration mode.

61
00:03:27,600 --> 00:03:31,670
Now for some verification,
let's do a show IPv6 protocol.

62
00:03:31,670 --> 00:03:34,850
We see here that IPv6
routing is enabled

63
00:03:34,850 --> 00:03:40,370
for BGP 100 as well as IS-IS 1.

64
00:03:40,370 --> 00:03:42,740
And we see that it's
configured for our loopback

65
00:03:42,740 --> 00:03:45,270
0 and our gigabit 1 interface.

66
00:03:45,270 --> 00:03:47,430
So so far, this is looking good.

67
00:03:47,430 --> 00:03:50,540
Let's do a show CLNS protocol.

68
00:03:50,540 --> 00:03:53,840
We see here that both
of our interfaces

69
00:03:53,840 --> 00:03:57,950
are supporting IP and IPv6.

70
00:03:57,950 --> 00:04:01,160
If we do a show
IS-IS neighbor, we

71
00:04:01,160 --> 00:04:05,210
see that we have a neighborship
with router 1 and router 7.

72
00:04:05,210 --> 00:04:09,800
If we do a show
IP route IS-IS, we

73
00:04:09,800 --> 00:04:12,950
see that we still have all
of our IPv6 four routes.

74
00:04:12,950 --> 00:04:16,670
And if we do a show
IPv6 route IS-IS,

75
00:04:16,670 --> 00:04:19,560
we see that we
don't have anything.

76
00:04:19,560 --> 00:04:24,620
So we have neighborships, but
we're not learning any prefixes

77
00:04:24,620 --> 00:04:27,440
from IPv6.

78
00:04:27,440 --> 00:04:31,520
Now the reason for this might
not be quite so obvious,

79
00:04:31,520 --> 00:04:33,590
but we did see some hints.

80
00:04:33,590 --> 00:04:38,420
We saw that iOS XR
defaults to multitopology.

81
00:04:38,420 --> 00:04:41,360
It was listing two
different topologies.

82
00:04:41,360 --> 00:04:44,720
IOS XE on the other
hand, does not.

83
00:04:44,720 --> 00:04:47,600
It defaults to single topology.

84
00:04:47,600 --> 00:04:50,670
And if you remember in one
of our previous videos,

85
00:04:50,670 --> 00:04:53,480
we mentioned that the
adjacencies will not

86
00:04:53,480 --> 00:04:57,530
come up if we don't
match on the topologies.

87
00:04:57,530 --> 00:05:00,120
Now the neighborship
itself comes up.

88
00:05:00,120 --> 00:05:04,200
But as you can see, we're not
properly exchanging databases.

89
00:05:04,200 --> 00:05:08,840
So let's change router
6 to be multitopology.

90
00:05:08,840 --> 00:05:10,680
This is a real easy fix.

91
00:05:10,680 --> 00:05:13,970
We just have to go back
into router IS-IS 1.

92
00:05:13,970 --> 00:05:20,060
And under address family IPv6
unicast, all we have to say

93
00:05:20,060 --> 00:05:22,290
is multitopology.

94
00:05:22,290 --> 00:05:24,770
We'll exit out of
our configuration.

95
00:05:24,770 --> 00:05:28,250
We'll do a show
IPv6 route IS-IS.

96
00:05:28,250 --> 00:05:32,210
We see that now we're
learning routes from router 1.

97
00:05:32,210 --> 00:05:35,840
We can verify this on
router 1 side as well.

98
00:05:35,840 --> 00:05:39,740
Here we'll say, show
IS-IS neighbor detail.

99
00:05:39,740 --> 00:05:42,650
And we see right
here towards router 6

100
00:05:42,650 --> 00:05:48,020
that it actually supports
IPv4 unicast and IPv6 unicast

101
00:05:48,020 --> 00:05:49,490
topologies.

102
00:05:49,490 --> 00:05:52,620
As one final test, let's make
sure we have reachability.

103
00:05:52,620 --> 00:05:55,130
So let's ping--
router 6 is loopback.

104
00:05:55,130 --> 00:05:56,930
It's 2001.

105
00:05:56,930 --> 00:05:58,706
Colon db8.

106
00:05:58,706 --> 00:05:59,540
Colon 10.

107
00:05:59,540 --> 00:06:01,100
Colon, colon 6.

108
00:06:01,100 --> 00:06:04,740
And we will source that from
our loopback interface as well.

109
00:06:04,740 --> 00:06:06,600
We see that this is successful.

110
00:06:06,600 --> 00:06:09,770
So we know we have routes
in both directions.

111
00:06:09,770 --> 00:06:14,690
As one final check, let's
go look at the IS-IS hellos

112
00:06:14,690 --> 00:06:16,850
in Wireshark.

113
00:06:16,850 --> 00:06:21,590
So right here at packet
1, we have an IS-IS Hello.

114
00:06:21,590 --> 00:06:23,000
So let's go ahead
and take a look

115
00:06:23,000 --> 00:06:26,090
at the detail in
the IS-IS Hello.

116
00:06:26,090 --> 00:06:30,410
If we expand the IS-IS Hello,
scroll down a little bit,

117
00:06:30,410 --> 00:06:32,040
a couple of things to note.

118
00:06:32,040 --> 00:06:34,970
First, under
protocols supported,

119
00:06:34,970 --> 00:06:37,460
if we open this field,
we see that it's

120
00:06:37,460 --> 00:06:41,480
supporting both IP and IPv6.

121
00:06:41,480 --> 00:06:47,900
And we see those values of
0xcc and 0x8e corresponding

122
00:06:47,900 --> 00:06:50,810
to those NLP IDs.

123
00:06:50,810 --> 00:06:55,700
Also, if we scroll down, we also
see here our traditional IPv6

124
00:06:55,700 --> 00:06:59,990
for interface addresses
at a type 132.

125
00:06:59,990 --> 00:07:03,110
Right below this, we
see the IPv6 interface

126
00:07:03,110 --> 00:07:06,080
addresses at a type 232.

127
00:07:06,080 --> 00:07:09,200
And we also see that
this is carrying

128
00:07:09,200 --> 00:07:13,250
the multitopology
information TLV.

129
00:07:13,250 --> 00:07:16,460
So here we can see all
of this information being

130
00:07:16,460 --> 00:07:19,800
carried on the wire.

131
00:07:19,800 --> 00:07:22,860
In this video, we
saw how to configure

132
00:07:22,860 --> 00:07:26,490
IS-IS to support IPv6.

133
00:07:26,490 --> 00:07:30,990
And given that we already
have our IS-IS structure built

134
00:07:30,990 --> 00:07:34,390
as far as areas, and net
numbers, and all of that,

135
00:07:34,390 --> 00:07:37,770
this is just as easy
as enabling the address

136
00:07:37,770 --> 00:07:41,040
family under the
appropriate interfaces.

137
00:07:41,040 --> 00:07:43,380
As such, I'm not
going to take us

138
00:07:43,380 --> 00:07:46,800
through every single interface
on every single router that

139
00:07:46,800 --> 00:07:48,330
needs to be configured.

140
00:07:48,330 --> 00:07:50,430
I'll configure those offline.

141
00:07:50,430 --> 00:07:52,770
And then in the
next video, we're

142
00:07:52,770 --> 00:07:56,190
just going to take a look at
how to do some summarization

143
00:07:56,190 --> 00:08:01,170
and redistribution
with IPv6 in IS-IS.

144
00:08:01,170 --> 00:08:06,150
All of the routers will
already be configured for IPv6.

145
00:08:06,150 --> 00:08:08,250
I hope this has been
informative for you,

146
00:08:08,250 --> 00:08:11,270
and I'd like to thank
you for viewing.

147
00:08:11,270 --> 00:08:15,000