EIGRP has been a lot of fun.
And what I'd like to do to close off
this little section of videos regarding EIGRP
is to do a few review questions, specifically three.
And for this set of questions, what we're going to do is this.
I'm going to go ahead and present the question.
And then I'm going to just be silent for like five
to 10 seconds.
Give you a chance to think about it.
Come up with the answer.
And then we'll review what the correct answer is together.
Also, I thought it'd be fun to mix it up a little bit.
And for these questions it's not multiple choice.
It's more like an essay type question, where WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
It's more like an essay type question, where
you have the question and you need
to come up with the answer on your own,
based on the content we've just finished together.
All right.
Here's question number one.
What is a successor in EIGRP?
And the answer is the successor is the winning route.
It is the route that, based on the lowest metric, WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
It is the route that, based on the lowest metric,
is placed in the routing table.
And if we have two equal cost routes, by default,
they will both be successor routes.
And they will both be in the routing table, by default.
And as a quick add-on to that, the successor route,
the metric for that successor route
is also referred to on that local router
as the feasible distance, which is the metric for that winning
route.
All right.
Question number two.
And here's question number two.
What would cause a feasible successor
to actually be promoted and put into the routing table?
WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
And I can think of a couple reasons
why a feasible successor would be promoted and put
in the routing table.
If the successor route went away,
the feasible successor would go ahead and be promoted
and put the routing table.
Or if we had the variance set up.
So if we had a variance that allowed that backup route--
that feasible successor to be put in the routing table, WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
that feasible successor to be put in the routing table,
the variance command could also do that.
And just as a reminder, the feasible successor
has to meet the feasibility condition, which simply
says that the advertised distance for that backup route,
for that feasible successor, the advertised metric has
to be less than the current feasible distance
for the successor route.
So two ways that this guy could be promoted.
The primary goes away.
Or we set up the variance with a multiplier
that's big enough to include that secondary route.
All right.
Question number three.
And this is the last question for our review.
And it's simply this.
What are the two factors, by default, WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
What are the two factors, by default,
that go into the equation for the metric in EIGRP?
So I'm looking for the two elements, by default,
it uses for its equation.
And here's the answer for that.
It is the lowest bandwidth in the path.
So that's one of the factors.
And a sum of all the delays in that path.
So the formula we did in the Nuggets, WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So the formula we did in the Nuggets,
but it's not too critical to remember all the details
for the actual formula.
But it is important to realize that the lowest
bandwidth in the path and a sum of the delays
are the two major factors that are
part of that formula for EIGRP to create its metric.
So I thank you for joining me in these Nuggets and videos
regarding EIGRP.
And I'll see you in the next set of videos.
Meanwhile, I hope this has been informative for you.
And I'd like to thank you for viewing.