Combining Host Processing and Network Forwarding

The following NTPL example demonstrate how to forward traffic from port 0 by splitting it between forwarding to port 1 and distributing the rest traffic across 12 streams in the host.

HashMode[Priority = 1; Layer3Type=IP] = Hash2TupleSorted
HashMode[Priority = 0; Layer3Type=IP; Layer4Type=TCP,UDP,SCTP] = Hash5TupleSorted

Action[Tag=balance; Width=24]={Index=0..11; StreamID=0..11},{Index=12..23; DestinationPort=1}
Assign[Action=balance]=Port==0

• HashMode configuration:
  • The first HashMode sets the hashing method to Hash2TupleSorted (based on source and destination IP addresses) with lower priority.
  • The second HashMode, with higher priority, sets the hashing method to Hash5TupleSorted (based on source/destination IP, source/destination port and protocol) for TCP, UDP, and SCTP packets.
• Action definition (balance):
  • The first action range (Index=0..11) maps frames to StreamID=0..11, enabling load balancing across 12 streams in the host.
  • The second action range (Index=12..23) directs frames to DestinationPort=1, forwarding them to port 1.
• Assign: Applies the balance action to received traffic on port 0.