Accton Technology 1500 manual Port Backup Function

EtherHub 1500 System User’s Guide

Slave agent will be replaced by the Master agent’s data. As a result, the Slave agent will assume the Master’s IP address when taking over the system. To manage the stack using the out-of- band control program after the Slave has assumed control, plug your PC or modem into the DTE port of the Backup agent.

In a redundant hub stack system, only two SNMP agents are allowed, one as a Master agent and the other as a Slave agent. The Master agent’s PWR/CPU LED remains steady, while the Slave agent’s PWR/CPU LED flashes at a regular beat. Placing two Master agents in the same stack will cause contention, resulting in either one reverting to a Slave agent automatically. Care should be taken if this condition arises, as the system will become unstable and management data may be lost.

For instructions on how to install a Slave agent, refer to Installing an SNMP Backup Agent in Chapter 3. For instructions on how to set the Master or Slave agent using the out-of-band management program or the Configure button, refer to the Configuration section later in this chapter.

Port Backup Function

The EtherHub 1500 system supports a port backup function (i.e., a redundancy link). A hub system can have up to 3 pairs of redundant links. These links are configurable using the in- band or out-of-band management program. When a primary link fails, the secondary link (backup) automatically takes over. Note that these links need not be physically connected to the same device.

A redundant link pair can consist of STP to STP ports, STP to ALT ports (via an appropriate MAU converter), or ALT to ALT ports. This means that a STP port linked to a particular device can have a BNC, AUI or fiber-optic port (ALT port) as backup.

4-4 Setup and Configuration