The ESXi dump collector sends VMkernel core contents to a network server when the system encounters a critical failure.

ESXi 5.1 dump collector supports both vSphere standard and distributed switches, as well as Cisco Nexus 1000 series switches. 802.1q tagging is allowed and set to zero (0) by default. The dump collector can also use any available uplink, if that uplink's port group is connected to a team.

Any changes to the IP address for the dump collector interface is automatically updated if the IP addresses for a configured physical network adapter changes. Dump collector also adjusts its default gateway if the gateway configuration changes.

If you try to delete the VMkernel network adapter used by the dump collector, the operation fails and a warning message appears. To delete the VMkernel network adapter used by the dump collector, disable dump collections and delete the adapter.

There is no authentication or encryption in the file transfer session from a crashed host to the dump collector. VMware recommends that you configure dump collector on a separate VLAN when possible to isolate the ESXi core from regular network traffic.

For information about installing and configuring dump collector, see the vSphere Installation and Setup documentation.