[networking] Add a note on bug in keepalived
Describes how a bug in keepalived v1.2.15 and earlier can affect operation of neutron features, and recommends upgrading to a greater version to avoid problems. Change-Id: I05de49e0043347b2cfcce3af8cf68796f70334b9 Closes-Bug: #1497272
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@ -26,6 +26,13 @@ configuring IP addresses on the interfaces in the ``snat`` namespace. In
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environments with more than one backup router, the rules of VRRP are followed
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to select a new master router.
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.. warning::
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There is a known bug with ``keepalived`` v1.2.15 and earlier which can
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cause packet loss when ``max_l3_agents_per_router`` is set to 3 or more.
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Therefore, we recommend that you upgrade to ``keepalived`` v1.2.16
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or greater when using this feature.
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.. note::
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Experimental feature or incomplete documentation.
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@ -27,6 +27,13 @@ that backup router to master router.
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for all routers. Therefore, VRRP promotes the backup router with the
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highest IP address to the master router.
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.. warning::
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There is a known bug with ``keepalived`` v1.2.15 and earlier which can
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cause packet loss when ``max_l3_agents_per_router`` is set to 3 or more.
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Therefore, we recommend that you upgrade to ``keepalived`` v1.2.16
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or greater when using this feature.
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Interruption of VRRP *heartbeat* traffic between network nodes, typically
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due to a network interface or physical network infrastructure failure,
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triggers a failover. Restarting the layer-3 agent, or failure of it, does
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