3143d86b69
Updates for patchset 2 review comments Changed link depth of main Planning index and added some narrative guidance Added planning/openstack as sibling of planning/kubernetes Related additions to abbrevs.txt Added max-workers substitution to accomodate StarlingX/vendor variants Signed-off-by: Ron Stone <ronald.stone@windriver.com> Change-Id: Ibff9af74ab3f2c00958eff0e33c91465f1dab6b4 Signed-off-by: Stone <ronald.stone@windriver.com>
38 lines
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38 lines
1.8 KiB
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Executable File
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.. gss1552671083817
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.. _redundant-top-of-rack-switch-deployment-considerations:
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======================================================
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Redundant Top-of-Rack Switch Deployment Considerations
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======================================================
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For a system that uses link aggregation on some or all networks, you can
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configure redundant |ToR| switches for additional reliability.
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In a redundant |ToR| switch configuration, each link in a link aggregate is
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connected to a different switch, as shown in the accompanying figure. If one
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switch fails, another is available to service the link aggregate.
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.. figure:: ../figures/jow1438030468959.png
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*Redundant Top-of-Rack Switches*
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|org| recommends that you use switches that support |VPC|. When |VPC| is used,
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the aggregated links on the switches act as a single |LAG| interface. Both
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switches are normally active, providing full bandwidth to the |LAG|. If there
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are multiple failed links on both switches, at least one connection in each
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aggregate pair is still functional. If one switch fails, the other continues to
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provide connections for all |LAG| links that are operational on that switch.
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For more about configuring |VPC|, refer to your switch documentation.
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You can use an active/standby failover model for the switches, but at a cost to
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overall reliability. If there are multiple failed links on both switches, then
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the switch with the greatest number of functioning links is activated, but
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links on that switch could be in a failed state. In addition, when only one
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link in an aggregate is connected to an active switch, the |LAG| bandwidth is
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limited to the single link.
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.. note::
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You can enhance system reliability by using redundant routers. For more
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information, refer to your router documentation.
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