anchor.diff:  -----
   
   
  -==== TRex specific 
  +==== TRex specific implementation details 
   
   TRex uses flow director filter to steer specific packets to specific queues. 
   To support that we change IPv4.TOS/Ipv6.TC  LSB to *1* to be steered. So latency packets will have this bit turn on (not only for ConnectX-4)
  -
  +Watch out, In case DUT will clear this bit (change the TOS with LSB==0, e.g. 0x3->0x2) packets won't be forward to TRex.
  +
  +==== Which NIC to buy?
  +
  +NIC with two ports will work better from performance prospective, so it is better to have MCX455A-ECAT(two 100gb port) and *not* the  MCX456A-ECAT (one 100gb port).
   
   ==== Limitation/Issues  
   
  
positive.code: 
  
  .ConnectX-4 NIC base QSFP28 support (100gb)
  [options="header",cols="1,1",width="90%"]
  |=================
  | link:https://en.wikipedia.org/wiki/QSFP[QSFP28]             |  ConnectX-4
  | QSFP28 SR4 optics  |  N/A
  
negative.code: | QSFP28 (AoC)       | Cisco QSFP-100G-AOCxM  [green]*works*  
  | QSFP28 DA twin-ax cables | Cisco QSFP-100G-CUxM [green]*works*  
  |=================
  
  .Cisco VIC NIC base QSFP+ support 
  [options="header",cols="1,2",width="90%"]
  |=================
  | link:https://en.wikipedia.org/wiki/QSFP[QSFP+]             |  Intel Ethernet Converged XL710-QDAX 
  | QSFP+ SR4 optics  |  N/A
  | QSFP+ LR-4 Optics |   N/A
  | QSFP Active Optical Cables (AoC) | Cisco QSFP-H40G-AOC [green]*works*  
  | QSFP+ Intel Ethernet Modular Optics |    N/A            
  | QSFP+ DA twin-ax cables | N/A  | N/A  
  | Active QSFP+ Copper Cables | N/A
  |=================
  
  
  // clarify above table and note. let's discuss.
  .FM10K QSFP28 support 
  