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Packets are duplicated when you configure a portgroup or a vSwitch to use a route that is based on IP-hash and Beacon Probing policies simultaneously (1017612)

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Details

Configuring a portgroup to use a route based on IP-Hash policy for load balancing and on the Beacon Probing policy for network failover detection at the same time results in duplicate packets.

Starting with the VirtualCenter 2.5 Update 6 release, the VI Client does not allow the configuration and displays the error message:

Setting Network Failover Detection to "Beacon Probing" and Load balancing to "Route based on IP Hash" at the same time is not a valid configuration. Please change your settings.

However, a few corner cases do exist, which allow a portgroup to inherit a policy setting, and therefore have the Route based on IP-hash and Beaconing Probing policies set on it.

Note: For more information, see the VMware VirtualCenter 2.5 Update 6 Release Notes.

Solution

To resolve this issue, perform one of these options:
  • If the uplinks are grouped into an LACP/EtherChannel/trunked/LAG ports configuration, set the Link Status Only option in the Network Failover Detection menu.

    Or

  • Set the Load Balancing policy to Port ID (In rare cases, Mac Hash can be useful). For more information, see the networking configuration document for your version of ESXi/ESX.
Notes:

Keywords

IP-hash, load balancing, Beacon Probing, failover, duplicate packets

This Article Replaces

Duplicated Packets Occur when Beacon Probing Is Selected Using vmnic and VLAN Type 4095 (1004373)

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