00:04
Okay, guys, don't be scared. I go away and I come back. And there's a scary looking formula on the on the board. It's not hard, and I will simplify this for you.
00:14
So, yes, J. R. P uses feasible distance
00:19
as this metric and what is feasible distance to find out. Well feasible distance is defined as
00:26
well defined in this formula. So K one into bandwidth
00:30
and I would swim. What K is
00:32
plaice skate you into band with over 2 56 minus the load on the link
00:37
or the current traffic on the link
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plus K three into delay The delay of the link? The delay a packet will incur while transporting that link
00:48
multiplied by care five
00:50
divided by care for into reliability, that reliability of the link being how many times in the past hour sold this ring cast failed and come back up
01:00
mount of the whole thing multiplied or scaled up two by 2 56
01:07
the band with for AARP is actually tend to the power seven,
01:12
divided by the Louis bandwidth between your current position and the destination between the source and the destination.
01:22
The AARP delay is defined as the sum of all delays between source and destination in units off tens off microseconds, though, this little U stands for microbe.
01:34
So whatever the total delays, we will simply divided by 10 because it has to be in units of tens of microseconds
01:42
by default. These K values
01:46
K one and K three are one and kid 24 and five are set to defy zero by default.
01:53
If Kay 50 then you ignore this half of the formula, which is weird. It doesn't work like that in mathematics, but it's discourse for a call. Cisco's rules.
02:04
So if K 50 you ignored this half of the formula,
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kid values range between zero and 255
02:12
Now what exactly is a K value?
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Here is nothing but a weight. It's a *** that you can turn so by default. Okay, one and K three are one, and everything else is set to zero.
02:23
When if I wanted Ta Joppy to also consider the load of the link
02:28
while making its calculations to find which the best route is with the Louis feasible distance, then I might want to increase
02:36
the K to value from zero to maybe five. I wanted to consider the load on the link a little bit more than bandwidth, or I wanted it to consider the loan on the link. Ah, lot more than band with. I can set this to
02:49
255 K to allude to 255
02:52
What if I want a job for you to consider only the delay of the link and not the band with? Well, I can set k 1 to 0 all of the K values to zero, and I can set K three, which is multiplied by delay to a high number or just one.
03:07
If I want your Joppy to only consider bandwith while making his calculation, I can set all other K values to zero, and I can just set k one to the number one or a higher value.
03:20
Now, as I said, T one and K three are won by default and every other K value is zero. Let's see what happens to our formula
03:30
once we set the K values
03:35
it's okay to four and five are zero.
03:38
care to a 00 into something a zero so this goes to zero
03:46
Okay, this whole portion goes to zero. If k 50 we ignore this side of the formula. So the formula produces down to K. One is one.
03:55
Anyone? Anything multiplied by one is the same number.
04:03
que trees one anything multiplied by one again is one
04:09
delay whole thing multiplied by
04:12
2 56 The fish feasible distance formula reduces down to bandwidth plus delay if default values are being used
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multiplied by 2 56 scaled up by 2 56
04:26
This concludes the metric portion or the feasibility feasible distance portion of the lecture.
