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Observed IP range does not show network in ESX or ESXi (1006744)

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Symptoms

  • In vCenter Server, the observed IP range does not show the network.
  • While using NIC teaming, only one of the NICs in the team shows a range and the others display None for Observed IP ranges.

Resolution

Observed IP range is picked up by physical traffic or if CDP has been enabled on your physical network switch.
This range is generated based on the incoming broadcast packets it detects. Therefore, for NICs that see only unicast/multicast traffic, it displays None.
 
To resolve this issue, verify that there is traffic going over all of the NICs using the esxtop command (when running enter n to select network statistics). You can also do this at the switch level with the counters provided by the vendor. If every link sees a fair share of frames/packets, your form of link aggregation is probably only sending broadcast traffic over the link which is displaying information for Observed IP range.

Additional Information

It has been reported that in some cases a reboot of the physical switch is required to resolve the issue.

See Also

Update History

05/20/2013 - Added 5.1 to the products list 03/28/2014 - Added ESXi and vCenter Server 5.5.x to products

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