Hirschmann RS20 User Manual page 129

Network Load Control
IGMP Querier
"IGMP Querier active" allows you to enable/disable the Query function.
"Protocol version" allow you to select IGMP version 1, 2 or 3.
In "Send interval [s]" you specify the interval at which the device sends
query packets (valid entries: 2-3,599 s, default setting: 125 s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
"Parameter Values").
IGMP-capable terminal devices respond to a query with a report
message, thus generating a network load.
Select large sending intervals if you want to reduce the load on your
network and can accept the resulting longer switching times.
Select small sending intervals if you require short switching times and
can accept the resulting network load.
IGMP Settings
"Current querier IP address" shows you the IP address of the device
that has the query function.
In "Max. Response Time" you specify the period within which the
Multicast group members respond to a query (valid values: 1-3,598 s,
default setting: 10 s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
"Parameter Values").
The Multicast group members select a random value within the
maximum response time for their response, to prevent all the Multicast
group members responding to the query at the same time.
Select a large value if you want to reduce the load on your network and
can accept the resulting longer switching times.
Select a small value if you require short switching times and can accept
the resulting network load.
In "Group Membership Interval" you specify the period for which a
dynamic Multicast group remains entered in the device if it does not
receive any report messages (valid values: 3-3,600 s, default setting:
260 s).
Note the connection between the parameters Max. Response Time,
Send Interval and Group Membership Interval
"Parameter Values").
Basic Configuration
Release 6.0 07/2010
8.2 Multicast Application
(see on page 130
(see on page 130
(see on page 130
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