NIC team failover, failback, or VMotion results in loss of network connectivity


When a network adapter or link within a NIC team fails, all traffic is rerouted over the available adapter in the team (in an Active/Standby configuration, the Standby adapter takes over for the failed Active adapter). Also, after a VMotion of a virtual machine, its network traffic is directed over one of the destination’s network adapters. If this does not occur and network connectivity is lost after either of these events, perform the following:
  1. Verify the physical network adapters are supported. For more information, see  ESX Server network adapter compatibility (1003685) .
  2. Verify all network links in the team are up. For more information, see Verifying a network link (1003724) .
  3. Verify that the physical switch ports are configured consistently among all network adapters in the team.
  4. Verify that port security is not configured on the physical switch ports. For more information, see Port security on the physical switch can cause a loss of network connectivity (1002811) .
  5. Verify that portfast (or equivalent) is enabled on all of the ESX Server host’s physical switch ports. For more information, see Spanning tree protocol in an ESX Server environment (1003804) .
  6. If connecting the NIC team adapters to separate physical switches, apply the following patches:
  7. Verify the integrity of the physical network adapter. For more information, see Verifying the integrity of the physical network adapter (1003686).

Full article at VMware.com

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About PiroNet

Didier Pironet is an independent blogger and freelancer with +15 years of IT industry experience. Didier is also a former VMware inc. employee where he specialised in Datacenter and Cloud Infrastructure products as well as Infrastructure, Operations and IT Business Management products. Didier is passionate about technologies and he is found to be a creative and a visionary thinker, expressing with passion and excitement, hopefully inspiring and enrolling people to innovation and change.
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