62ef3d1ab8
Correct conditionalization on 2 blocks per install procedure Add note about initial controller unlock and IPMG (except simplex) Signed-off-by: Ron Stone <ronald.stone@windriver.com> Change-Id: I65d9f149abf754654822457ea564062b1c203910
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914 B
ReStructuredText
16 lines
914 B
ReStructuredText
.. note::
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Controller-0 and controller-1 use IP multicast messaging for
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synchronization. If loss of synchronization occurs a few minutes after
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controller-1 becomes available, ensure that the switches and other devices
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on the management and infrastructure networks are configured with
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appropriate settings.
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In particular, if |IGMP| snooping is enabled on |ToR| switches, then a
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device acting as an |IGMP| querier is required on the network \(on the same
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|VLAN|\) to prevent nodes from being dropped from the multicast group. The
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|IGMP| querier periodically sends |IGMP| queries to all nodes on the
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network, and each node sends an |IGMP| join or report in response. Without
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an |IGMP| querier, the nodes do not periodically send |IGMP| join messages
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after the initial join sent when the link first goes up, and they are
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eventually dropped from the multicast group.
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