1
00:00:00,000 --> 00:00:03,430
[AUDIO LOGO]

2
00:00:03,430 --> 00:00:07,360

3
00:00:07,360 --> 00:00:12,010
Welcome to Explain Outbound
BGP Path Selection.

4
00:00:12,010 --> 00:00:16,660
Getting BGP actually up and
running with our neighborships

5
00:00:16,660 --> 00:00:21,250
and learning prefixes is
really only a very small part

6
00:00:21,250 --> 00:00:24,490
of why we want to run
BGP to begin with.

7
00:00:24,490 --> 00:00:29,500
Yes, it's highly scalable, and
we can carry thousands and even

8
00:00:29,500 --> 00:00:31,210
millions of prefixes.

9
00:00:31,210 --> 00:00:34,720
However, at the end of the day,
one of the biggest attributes

10
00:00:34,720 --> 00:00:40,190
of BGP is the ability to
control its routing decisions.

11
00:00:40,190 --> 00:00:43,540
This is often, of course,
referred to as routing

12
00:00:43,540 --> 00:00:47,990
by policy, and well, we
have to write that policy.

13
00:00:47,990 --> 00:00:50,980
So what we're going to be
looking at in this skill

14
00:00:50,980 --> 00:00:53,320
is how to do just that.

15
00:00:53,320 --> 00:00:56,710
How do we manipulate
the BGP attributes

16
00:00:56,710 --> 00:00:59,860
in order to get BGP to
choose the path that we

17
00:00:59,860 --> 00:01:01,240
want it to choose?

18
00:01:01,240 --> 00:01:06,610
So we'll start off here by
looking at the overall BGP path

19
00:01:06,610 --> 00:01:08,050
selection process.

20
00:01:08,050 --> 00:01:11,950
There are quite a few steps
in it, and then the ones

21
00:01:11,950 --> 00:01:14,200
that we normally
use to control path

22
00:01:14,200 --> 00:01:20,050
selection, such as local
preference, AS path prepending,

23
00:01:20,050 --> 00:01:23,140
adjusting the multi-exit
discriminator, or the MED,

24
00:01:23,140 --> 00:01:25,990
or as Cisco calls
it, the metric.

25
00:01:25,990 --> 00:01:27,640
These are things
we're going to be

26
00:01:27,640 --> 00:01:31,760
looking at in more detail in
their own separate videos.

27
00:01:31,760 --> 00:01:34,010
So let's jump in
and get started.

28
00:01:34,010 --> 00:01:35,960
This is a lot of fun.

29
00:01:35,960 --> 00:01:39,270
We'll see you in the next video.

30
00:01:39,270 --> 00:01:43,000