If you are setting up a new Dell server (according to the approved Hardware Compatibility List available on the Symantec Support site), and if you use 10G SFP+ modules that are not supported by the Intel 10G fiber card, the interfaces will not show up in the Security Analytics Capture Summary page.
Intel 10G cards only support specific SFP+ modules. As of Dec 2014, the Dell 10G appliances use the Intel Ethernet Adapter X520 family adapter. You can confirm that the adapter doesn't support the SFP+ modules by looking at the /var/log/messages file and searching for "SFP" and looking for any messages about the SFP module being "unsupported".
You must use Intel-brand SFP+ modules or contact Dell to confirm that the SFP+ modules are supported with the X520 cards.
NOTE: Once the correct modules are acquired, there is no need to reinstall any software or reconfigure the Security Analytics appliance. The modules will be recognized automatically and will be made available as capture interfaces.