Multicast Bandwidth Map Example; Table 4: Adaptive Mode Algorithm Values - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

period T
T
The first two sampling interval calculations are as follows:
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.
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
to R
at least a threshold value (specified as a percentage, P) of the measured peak
bandwidth. This calculation is as follows:
R = Rt, if and only if the absolute value of (R - Rt) > P * R.
Table 4 on page 13 lists values assigned to variables associated with this algorithm.

Table 4: Adaptive Mode Algorithm Values

Multicast Bandwidth Map Example

The following example creates a multicast bandwidth map for both multicast traffic
admission control and QoS adjustment:
NOTE: In this example, you can replace the set admission-bandwidth command
and set qos-bandwidth command with their adaptive command counterparts.
to yield the average rate. This process is repeated every sampling interval,
1
, to yield rates R1, R2, R3, and so on.
2
= (N - N )/5
1 5 0
= (N - N )/5
2 #+5 #
. A rate update occurs whenever a newly calculated rate (R) differs from R
1
Variable Value Units
T1 5 Seconds
T2 0 Seconds
H 12 Samples
M 12 Samples
P 1 Percent
Chapter 1: Configuring IPv4 Multicast
is computed at time t = 5 seconds, R is set
s
Description
Sampling period; the time in which a sample is taken
Sampling interval; zero (0) seconds indicates continuous
sampling
Number of history samples over which to compute
measurement
Maximum number of samples maintained in history
Threshold value; percent difference by which a newly
calculated rate must differ from the measured peak
bandwidth before a rate update occurs
Defining a Multicast Bandwidth Map
by
1
13