3Com 5124M-TPCL manual Setting Port Redundancy, Setting Backbone Redundancy

Setting Port Redundancy

When you enable redundancy between two ports, the ports are automatically enabled. Once port redundancy is enabled:

❑Port 1 is the primary link, which passes data.

❑Port 2 is the redundant link, which does not pass data in either direction. However, the link is monitored for any failures (the Port Status LED indicates any problems).

Configuring Ports for Fault Tolerance

You can configure the 24-Port Module ports in one of three different ways:

❑Normal Configuration - All ports operate as independent cable ports.

❑Flexible Redundant Configuration - You can arbitrarily assign primary and backup ports to any pair of ports. You can configure this mode only through the advanced management commands provided with the Ethernet Management Module Version v3.0 or later.

❑Normal and Redundant Configuration - You can enable redundancy between one set of ports and have the remaining ports operate as independent ports.

Setting Backbone Redundancy

For maximum backbone tolerance, connect both the primary and backup ports back to the central concentrator (refer to Figure 2-5). This configuration allows the backup port to automatically take over if the primary link fails.

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