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Immediate Leave
Select this option if, on each port of the VoIP Gateway, only one
host sends IGMP multicast groups reports (the host can be a
member of multiple multicast groups and a specific group can be on
a few ports).
This option enables the VoIP Gateway to use a simple and faster
Leave algorithm.
Proxy IP
Optional IP address used in IGMP when the unit sends IGMP-
specific queries. If you want the regular IP address to be used,
leave this field blank.
Minimum Query
Interval
General queries received within an interval less than the
Minimum
Query Interval
are not transferred to the IGMP hosts and their
report status is not updated. Response although is transmitted to
the IGMP querier based on reports for the last valid query. The
default value for the
Minimum
Query Interval
is 5 seconds and the
range is 5-2000 seconds.
Last Member Query
Interval
This value, in units of 100 msec, specifies the Maximum Response
Time inserted into Group-Specific Queries which the VoIP Gateway
sends in response to Leave Group messages received on the VoIP
Gateway ports. You may enter values in the range 5-100 (0.5-10
seconds). The default value is 10 (one second). A smaller value
allows less time to detect the leave of the last member of a
multicast group. See
Note
below.
Last Member Query
Count
The number of group-specific queries sent before the unit assumes
that there are no local members. The default value is 2, and the
allowed range is 1-9. The number is effective only if
Immediate
Leave
is not selected.
Enable IP Multicast
Flooding
This field defines how the VoIP Gateway treats IP multicast frames
that were not requested by any host.
If IP Multicast Flooding is
disabled
, then any IP multicast frame
within the range specified by
Min IP address
and
Max IP address
will be filtered if no host reports that it belongs to its multicast group.
If Multicast Flooding is
enabled
, then an IP multicast frame without
any host report is flooded to all host ports.
Min IP address
Max IP address
These fields specify the filtering range of unrequested frames if
IP
Multicast Flooding
is disabled.
NOTE
The VoIP Gateway assumes that the Last Member Query Interval used by the
Querier is the same as the Last Member Query interval configured in the VoIP
Gateway. Using a larger interval by the Querier could cause a short period of
flooding of group multicasts.
11.7
SNMP Configuration
To enable access of the VoIP Gateway from a Network Management Station, you must
configure SNMP parameters.
To view and update the SNMP configuration:
In the left-hand menu of the current VoIP Gateway Web page, select
SNMP (
.
The SNMP Configuration page appears. Make selections
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