Expand Configuration and Management Manual (H06.21+, J06.10+)

Expand Overview

Expand Configuration and Management Manual — 529522-013

2 - 6

Systems Network Architecture (SNA) Networks

SNA was developed by IBM for connecting IBM systems and networks. Expand-over-

SNA connections are provided with the HP SNAX/Advanced Peer Networking

(SNAX/APN) product. The Expand subsystem uses the NETNAM protocol to

communicate with the SNAX/APN line-handler process.

Internet Protocol (IP) Networks

An IP network adheres to the Internet Protocol—a computer-industry standard

protocol. An ever-increasing number of public and private networks are based on IP,

including the Internet itself. Expand-over-IP connections are provided by the NonStop

TCP/IP products.

Asynchronous Transfer Mode (ATM) Networks

ATM is a cell-switching and multiplexing technology that combines the benefits of

circuit switching (constant transmission delay and guaranteed capacity) with those of

packet switching (flexibility and efficiency for intermittent traffic). Expand-over-ATM

connections are provided with the ATM subsystem.

ServerNet Clusters

ServerNet Clusters use Expand to provide a high-speed interconnect between servers

over a limited geographic range. Three network topologies are supported: the star,

split-star, and tri-star topologies. The star topology supports up to eight nodes. The

split-star topology supports up to 16 nodes. The tri-star topology supports up to 24

nodes

The 16-node configuration is split between two NonStop cluster switches per external

fabric in what is known as a split-st

ar topology and the 24-node configuration is split

between three cluster switches per external fabric in what is known as a tri-star

topology. Using single-mode fiber-optic cables to link the two centers of the split-star

and the three centers of the tri-star allows a greater distance (up to one kilometer)

between the cluster switches and their connected nodes.

For more topology information, see Section 4, Planning for ServerNet Clusters.

Note. The Integrity NonStop NS1000 server does not support ServerNet clusters.

Note. The Integrity NonStop NS-series server cannot participate in more than one ServerNet

cluster