InfiniBand Network Architecture

Basic Operational Characteristics

In Figure 20-1 on page 525, refer to QPs 4 and 5 in one CA and QP 2 in the other CA. The UD service has the following basic characteristics:

• No connection setup. No initial connection setup with a remote QP is necessary prior to sending or receiving messages.

• QP attached to specific port. The QP is associated with a specific local CA port through which it sends and receives messages with remote UD QPs.

• Port association may limit destinations. The QP can only send and receive messages with remote UD QPs that can be reached through the local CA port with which the QP is associated.

• The destination is specified in each WR. Each WR posted to the QP's SQ can target a different remote UD QP.

• Message size. Each message ...