Table 9: Adaptive Mode Algorithm Values - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

JUNOSe 11.0.x Multicast Routing Configuration Guide
To calculate the measured bandwidth of a stream, the router uses the following
equation:
R = (N
Where
R = Calculated bandwidth of the stream during each sampling interval
N
N
NOTE: When the mroute is first installed in the FC (at t = 0), R
For multicast admission control no joins are admitted until the first bandwidth
measurement is computed (that is, for admission control, R
infinite). Similarly, no QoS adjustment occurs until the first bandwidth measurement
is computed (that is, for QoS adjustment, R
Using the earlier graph as a reference, the first bandwidth rate (R1
(N
to yield the average rate. This process is repeated every sampling interval, T
yield rates R1, R2, R3, and so on.
The first two sampling interval calculations would look like the following:
R
R
The router maintains a history of bandwidth measurements (H) for each mroute, up
to a maximum of M measurements. The actual rate, R, reported to the SRP is the
maximum rate measured in those H samples.
In order to minimize the IC to SRP traffic generated by the rate measurements, the
IC reports a bandwidth change only when a newly computed rate (R#) differs from
the current rate by a specified threshold. When R
R is set to R
R
bandwidth. This calculation would look like the following:
R = Rt, if and only if the absolute value of (R - Rt) > P * R.
The values assigned to variables associated with this algorithm are as shown in Table
9 on page 156.

Table 9: Adaptive Mode Algorithm Values

156
Defining a Multicast Bandwidth Map
– N ) / 5
t+5 t
= Bytes measured at the start of each sampling period (t seconds)
t
= Bytes measured at the end of each sampling period (t+5 seconds)
t+5
) and the bytes received values are subtracted and divided by the time period T
5
= (N - N )/5
1 5 0
= (N - N )/5
2 #+5 #
. A rate update occurs whenever a newly calculated rate (R) differs from
1
by at least a threshold value (specified as a percentage, P) of the measured peak
1
Variable Value Units
T1 5 Seconds
0
is considered to be zero [0]).
0
is computed at time t = 5 seconds,
s
Description
Sampling period; the time in which a sample is taken
is undetermined.
0
is considered to be
) and at time t
0 5
1
, to
2