Outbound Traffic Flow - Dell Broadcom NetXtreme Family of Adapters User Manual

Broadcom Teaming Services: Broadcom NetXtreme II Network Adapter User Guide
assigned to a different port.
Figure 2: Intermediate Driver

Outbound Traffic Flow

The Broadcom Intermediate Driver manages the outbound traffic flow for all teaming modes. For outbound traffic, every
packet is first classified into a flow, and then distributed to the selected physical adapter for transmission. The flow
classification involves an efficient hash computation over known protocol fields. The resulting hash value is used to index into
an Outbound Flow Hash Table.The selected Outbound Flow Hash Entry contains the index of the selected physical adapter
responsible for transmitting this flow. The source MAC address of the packets will then be modified to the MAC address of the
selected physical adapter. The modified packet is then passed to the selected physical adapter for transmission.
The outbound TCP and UDP packets are classified using Layer 3 and Layer 4 header information. This scheme improves the
load distributions for popular Internet protocol services using well-known ports such as HTTP and FTP. Therefore, BASP
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