HP UX Auto Port Aggregation (APA) Software manual Server-to-Server Back-to-Back

Figure 3-3 Sample Router and Server Configuration (Switch)

Run Attn. Fault RemotePower

HP APA 2–4 Port

Link Aggregation

Switch

Router or

Switching Router

Intranet

Internet

Server-to-Server (Back-to-Back)

Figure 3-4 (page 27) shows a sample server-to-server configuration. You create server-to-server aggregations by directly connecting the physical ports in one server's link aggregation to the physical ports in the other server's link aggregation. This configuration has the following characteristics:

•It needs many TCP/UDP client connections between the servers in order for load balancing to be effective. Therefore, use the HP APA TCP/UDP port load-balancing algorithm.

•Depending on the network traffic bandwidth requirements, use two to four 100BT interfaces or two to four Gigabit interfaces in an PAgP or MANUAL link aggregation. For the December 2005 release (B.11.23.10), you can use two to eight interfaces. With LACP, you can use up to 32 interfaces in the link aggregation. This enables bandwidth scalability as network loads increase as the organization grows.

26 Configuring APA