Setting

Balancing applies only to IP addresses belonging to the AS defined as local in asnum.dscp.

1. Define an autonomous system with IP addresses that are used by subscribers:

   vi aslocal.txt
   10.0.0.0/8 64511
   172.16.0.0/12 64511
   192.168.0.0/16 64511
   cat aslocal.txt | as2bin /etc/dpi/aslocal.bin

   1. Examples for IPv4
   2. Example for IPv6
2. Mark a given autonomous system as local:

   vi my_as_dscp.txt
   64511 local
   10415 local
   cat my_as_dscp.txt | as2dscp /etc/dpi/asnum.dscp

   You can use either a custom AS or a public AS as the AS.
   Read more at the link

3. A reload must be performed to apply the parameters:

   service fastdpi reload

1. Define the input and output interfaces in the configuration file.
   The input interfaces to which the traffic mirror is fed are specified in the in_dev parameter, and the output interfaces are specified in out_dev.
   Interfaces do not form pairs and species constructs are allowed:

   in_dev=05-00.0:05-00.1:05-00.2:05-00.3:0b-00.0:0b-00.1:0b-00.2:0b-00.3
   out_dev=08-00.0:08-00.1:08-00.2:08-00.3

   Or

   in_dev=05-00.0
   out_dev=out_dev=08-00.0:08-00.1:08-00.2:08-00.3

2. Enable balancing mode in the enable_l2_lb parameter, where:
   • 0 — deactivate balancing;
   • 1 — activate balancing.
3. Determine by what value to initialize the hash table in the lb_hash_out_dev_type parameter, where:
   • 0 — use the internal index of the output interface;
   • 1 — use the interface name from [in|out]_dev.
4. Select an engine to handle thread dispatchers in the dpdk_engine parameter, where:
   • 0 — read/write default engine, one dispatcher for everything;
   • 1 — read/write engine with two dispatcher threads: a dispatcher for each direction;
   • 2 — Read/write engine with RSS support: for each direction, dpdk_rss dispatchers are created (default dpdk_rss=2), so total number of dispatchers = 2 * dpdk_rss— to work with in_dev, and a separate dispatcher to work with out_dev.
     When the parameter value is 2, the mqrx_lb_engine engine is activated. The principle of operation is the same as in the usual mode dpdk_engine=2, only rss is enabled on in_dev, and only one rx queue is created on out_dev.
     
     Learn more about the dpdk_engine parameter by clicking here.
5. The lb_hash_type parameter is used to select the hashing algorithm. Currently, the maglev algorithm is supported (parameter value 0) — an algorithm with a fixed-size hash table. The hash for load balancing is calculated as follows:
   • if both src and dst IPs are local, the hash is calculated based on these two addresses;
   • if only the src IP is local, the hash is calculated based on the src IP;
   • if only the dst IP is local, the hash is calculated based on the dst IP;
   • otherwise, the hash is calculated based on src and dst IPs.
     
     The calculated hash value is then used to determine the output interface by finding the index of the hash table cell that contains the interface index from the array of output interfaces.