Avaya 8600 Configuration Manual page 15

source subnet address S[0].S[1].S[2].S[3]
source mask SM[0].SM[1].SM[2].SM[3]
The port is calculated by using:
( ( ( (( G[0] AND GM[0] ) XOR ( S[0] AND SM[0] ) ) XOR ( (G[1] AND GM[1] ) XOR ( S[1] AND
SM[1] )) ) XOR ( (G[2] AND GM[2] ) XOR ( S[2] AND SM[2] )) ) XOR ( ( G[3] AND GM[3] ) XOR
( S[3] AND SM[3] )) ) MOD (active ports of the MLT)
Algorithm example
The traffic distribution algorithm causes sequential distribution if the streams are similar in the
following example.
Assume that the MLT ports are 1/1 to 1/4, the source mask configuration is 0.0.0.0 and the
group mask configuration is 255.255.255.255. The source A.B.C.D. is sent to the following
groups:
X.Y.Z.1
X.Y.Z.2
X.Y.Z.3 to X.Y.Z.10
The algorithm chooses link 1/1 for group X.Y.Z.1, X.Y.Z.2 goes on port 1/2, X.Y.Z.3 goes on
port 1/3, X.Y.Z.4 goes on port 1/4, X.Y.Z.5 goes on port 1/1, and so on.
Multicast traffic distribution
The goal of traffic distribution is to achieve stream distribution on the MultiLink trunk links when
an MLT configuration change takes place. Traffic distribution is based on the IP multicast MLT
distribution algorithm, which is the same for all modules.
Traffic distribution is disabled by default. When you add or remove a link from the MultiLink
trunk, the active streams continue to flow on the original links. If distribution is enabled, the
active streams redistribute according to the distribution algorithm on the links of the MultiLink
trunk links.
When changing the state parameters of multicast traffic distribution, minor traffic interruptions
can occur.
To minimize the effect of multicast traffic distribution on the MultiLink trunks, the implementation
does not move the streams to the appropriate links at one time. Instead, it redistributes a few
streams at every time tick of the system. When an MLT port becomes inactive and distribution
is disabled, only affected streams are redistributed on the remaining active ports.
If you enable distribution, all streams redistribute on the MLT ports based on the distribution
algorithm assignment.
Configuration — Link Aggregation, MLT, and SMLT
MultiLink Trunking
January 2012 15