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Robustness Variable (1-255 sec): The Robustness Variable allows
adjustment for the expected packet loss on a subnet. If a subnet is
expected to be lossy, the Robustness Variable may be increased. The
Robustness Variable can not be set zero, and SHOULD NOT be one.
Default is 2 seconds.
Last Member Query Interval (1-25 sec): The Last Member Query
Interval is the Max Response Time inserted into Group-Specific
Queries sent in response to Leave Group messages, and is also the
amount of time between Group-Specific Query messages. This value
may be adjusted to modify the "leave latency" of the network. A
reduced value results in reduced time to detect the loss of the last
member of a group. Default is 1 second.
Host Timeout (130-1225 sec): This is the interval after which a learnt
host port entry will be purged. For each host port learnt, a
'PortPurgeTimer' runs for 'HostPortPurgeInterval'. This timer will be
restarted whenever a report message from host is received over that
port. If no report messages are received for 'HostPortPurgeInterval'
time, the learnt host entry will be purged from the multicast group.
Default is 260 seconds.
Router Timeout (60-600 sec): This is the interval after which a learnt
router port entry will be purged. For each router port learnt, a
'RouterPortPurgeTimer' runs for 'RouterPortPurgeInterval'. This timer
will be restarted whenever a router control message is received over
that port. If no router control messages are received for
'RouterPortPurgeInterval' time, the learnt router port entry will be
purged. Default is 125 seconds.
Leave Timer (0-25 sec): This is the interval after which a Leave
message is forwarded on a port. When a leave message from a host for
a group is received, a group-specific query is sent to the port on which
the leave message is received. A timer is started with a time interval
equal to IgsLeaveProcessInterval. If a report message is received