Star Topology

In a star topology, the host communicates directly with each node through the external switch. You must use an external switch in a star topology; for network synchronization, you must use an external IEEE 802.1AS switch. Redundant links are recommended, but optional, in this topology. You must configure the network properly with a recommended external switch before creating redundant links in the network.

Figure 1. Star Topology

Advantages:

• Unpowered nodes and/or node failure does not disrupt network communication with other nodes
• Failure of any single Ethernet cable does not disrupt network communication when you have a redundant link
• Additional nodes or heavier network traffic affects network performance less than the other topologies
• Simple installation, expansion, and troubleshooting

Disadvantages:

• Most costly of the recommended topologies
• Requires an external switch (external IEEE 802.1AS switch for network synchronization)
• Covers the least distance