anchor.diff:  [options="header",cols="2,1,1,1",width="90%"]
   |=================
   | link:https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver[SFP+]  | Intel Ethernet Converged X710-DAX |  Silicom link:http://www.silicom-usa.com/PE310G4i71L_Quad_Port_Fiber_SFP+_10_Gigabit_Ethernet_PCI_Express_Server_Adapter_49[PE310G4i71L] (Open optic) | 82599EB 10-Gigabit
  -| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-SR] | Does not work     | [green]*works* | [green]*works*
  -| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-LR] | Does not work     | [green]*works* | [green]*works*
  -| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-H10GB-CU1M]| [green]*works* | [green]*works* | [green]*works*
  -| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-AOC1M] | [green]*works* | [green]*works* | [green]*works*
  +| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-SR] | Not supported  | [green]*Supported* | [green]*Supported*
  +| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-LR] | Not supported     | [green]*Supported* | [green]*Supported*
  +| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-H10GB-CU1M]| [green]*Supported* | [green]*Supported* | [green]*Supported*
  +| link:http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html[Cisco SFP-10G-AOC1M] | [green]*Supported* | [green]*Supported* | [green]*Supported*
   |=================
   
   [NOTE]
   =====================================
  - Intel X710 NIC (example: FH X710DA4FHBLK) operates *only* with Intel SFP+. For open optic, use the link:http://www.silicom-usa.com/PE310G4i71L_Quad_Port_Fiber_SFP+_10_Gigabit_Ethernet_PCI_Express_Server_Adapter_49[Silicom PE310G4i71L] NIC.
  + Intel X710 NIC (example: FH X710DA4FHBLK) operates *only* with Intel SFP+. For open optic, use the Silicom PE310G4i71L NIC, available here:
  + http://www.silicom-usa.com/PE310G4i71L_Quad_Port_Fiber_SFP+_10_Gigabit_Ethernet_PCI_Express_Server_Adapter_49
   =====================================
  +// it appears that link:<link> doesn't work in a note, so i changed the wording
   
   // clarify above table and note
   
   .XL710 NIC base QSFP+ support 
   [options="header",cols="1,1,1",width="90%"]
   |=================
  -| link:https://en.wikipedia.org/wiki/QSFP[QSFP+]             |  Intel Ethernet Converged XL710-QDAX | Silicom link:http://www.silicom-usa.com/Dual_Port_Fiber_40_Gigabit_Ethernet_PCI_Express_Server_Adapter_PE340G2Qi71_83[PE340G2Qi71] Open optic 
  -| QSFP+ SR4 optics  |  APPROVED OPTICS [green]*works*,  Cisco QSFP-40G-SR4-S does *not* work   | Cisco QSFP-40G-SR4-S [green]*works* 
  -| QSFP+ LR-4 Optics |   APPROVED OPTICS [green]*works*, Cisco QSFP-40G-LR4-S does *not* work   | Cisco QSFP-40G-LR4-S [green]*works* 
  -| QSFP Active Optical Cables (AoC) | Cisco QSFP-H40G-AOC [green]*works*  | Cisco QSFP-H40G-AOC [green]*works* 
  -| QSFP+ Intel Ethernet Modular Optics |    N/A            |  N/A
  -| QSFP+ DA twin-ax cables | N/A  | N/A  
  -| Active QSFP+ Copper Cables | Cisco QSFP-4SFP10G-CU [green]*works*  | Cisco QSFP-4SFP10G-CU [green]*works*
  +| link:https://en.wikipedia.org/wiki/QSFP[QSFP+]             | Intel Ethernet Converged XL710-QDAX                                          | Silicom link:http://www.silicom-usa.com/Dual_Port_Fiber_40_Gigabit_Ethernet_PCI_Express_Server_Adapter_PE340G2Qi71_83[PE340G2Qi71] Open optic 
  +| QSFP+ SR4 optics                                           | [green]*Supported*: APPROVED OPTICS. *Not supported*: Cisco QSFP-40G-SR4-S   | [green]*Supported*: Cisco QSFP-40G-SR4-S  
  +| QSFP+ LR-4 Optics                                          | [green]*Supported*: APPROVED OPTICS. *Not supported*: Cisco QSFP-40G-LR4-S   | [green]*Supported*: Cisco QSFP-40G-LR4-S 
  +| QSFP Active Optical Cables (AoC)                           | [green]*Supported*: Cisco QSFP-H40G-AOC                                      | [green]*Supported*: Cisco QSFP-H40G-AOC  
  +| QSFP+ Intel Ethernet Modular Supported                     | N/A                                                                          | N/A
  +| QSFP+ DA twin-ax cables                                    | N/A                                                                          | N/A  
  +| Active QSFP+ Copper Cables                                 | [green]*Supported*: Cisco QSFP-4SFP10G-CU                                    | [green]*Supported*: Cisco QSFP-4SFP10G-CU
   |=================
   
   [NOTE]
  
positive.code: 
  [NOTE]
  =====================================
   * To use TRex, you should have sudo on the machine or the root password.
   * Upgrading the linux Kernel using `yum upgrade` requires building the TRex drivers. 
   * In Ubuntu 16, auto-updater is enabled by default. It's advised to turn it off as with update of Kernel need to compile again the DPDK .ko file. +
  Command to remove it: +
   > sudo apt-get remove unattended-upgrades
  =====================================
  
  
negative.code: === Configuring for loopback
  
  Before connecting TRex to your DUT, it is strongly advised to verify that TRex and the NICs work correctly in loopback. +
  
  [NOTE]
  =====================================================================
  1. For best performance, loopback the interfaces on the same NUMA (controlled by the same physical processor). If you are unable to check this, proceed without this step.
  
  2. If you are using a 10Gbs NIC based on an Intel 520-D2 NIC, and you loopback ports on the same NIC using SFP+, the device might not sync, causing a failure to link up. +
  Many types of SFP+ (Intel/Cisco/SR/LR) have been verified to work. +
  If you encounter link issues, try to loopback interfaces from different NICs, or use link:http://www.fiberopticshare.com/tag/cisco-10g-twinax[Cisco twinax copper cable].
  =====================================================================
  
  .Loopback example
  image:images/loopback_example.png[title="Loopback example"] 
  
  ==== Identify the ports 
  
  Use the following command to identify ports.
  
  [source,bash]
  ----
  