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Router:
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sends
Membership Query messages to All Hosts (224.0.0.1)
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query-interval
= 125 secs default
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router
with lowest IP address is Querier (rest non-queriers)
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If
lower-IP address query heard, backoff to non-querier state
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Other
Querier Present Interval default: (robust-count x query-interval) +
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(0.5
x query-response-interval) =
255 secs
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listens
for reports (whether querier or not) and adds group to membership
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list
for that interface
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query-response-interval
= 10 secs default
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timeout
(Group member interval) default:
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(robust-count
x query-interval) + (1 x query-response-interval) =
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260
sec
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robust-count
- provides fine-tuning to allow for expected packet loss on a
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subnet.
Default = 2 (tunable from 2-10)
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