Igmp Querier; Igmp Settings - Hirschmann RS20 User Manual

Network load control

IGMP Querier

"IGMP Querier active" allows you to enable/disable the Query function.
The Protocol selection fields allow you to select IGMP version 1, 2 or 3.
In "Sending interval" you specify the interval at which the device sends
query packets (valid entries: 2-3599 s, default setting: 125 s). All 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 net-
work 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 router that
has the query function.
In "Response Time" you specify the period within which the Multicast
group members respond to a query (valid values: 1-3598 s, default
setting: 10 s).
The Multicast group members select a random value within the
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: 3-3600 s, default setting:
260 s).
Basic Configuration L2P
Release 4.2 07/08
7.2 Multicast application
101