User`s manual

Sans Digital – EN104L+(B) Admin Guide
17
Receive traffic from connections created by the server is also balanced. When the server sends an ARP Request the bonding driver
copies and saves the client's IP information from the ARP. When the ARP Reply arrives from the client, its hardware address is
retrieved and the bonding driver initiates an ARP reply to this client assigning it to one of the slaves in the bond. A problematic
outcome of using ARP negotiation for balancing is that each time that an ARP request is broadcasted it uses the hardware address of
the bond. Hence, clients learn the hardware address of the bond and the balancing of receive traffic collapses to the current salve.
This is handled by sending updates (ARP Replies) to all the clients with their assigned hardware address such that the traffic is
redistributed. Receive traffic is also redistributed when a new slave is added to the bond and when an inactive slave is re-activated.
The receive load is distributed sequentially (round robin) among the group of highest speed slaves in the bond.
When a link is reconnected or a new slave joins the bond, the receive traffic is redistributed among all active slaves in the bond by
initiating ARP Replies with the selected MAC address to each of the clients. The un-delay mode probe parameter must be set to a
value equal or greater than the switch's forwarding delay so that the ARP Replies sent to the clients will not be blocked by the
switch.