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Configuring a Backup Link

Configure the Monitoring Hub Only. All configuration of the backup link is

performed from the console on the hub that is responsible for monitoring the backup link.

On the remote hub, you only need to make sure the ports used in the primary and backup

links are both enabled.

Use the Console’s Backup Command. To configure this link, you use the Backup

command on the hub console interface. The command prompts you to identify the port

used for the backup link, the port used for the primary link, the station address of the hub

at the remote end of the link, how frequently (in seconds) test packets (used to check the

status of the primary link) should be sent to the remote hub, and how many consecutive

response failures will trigger activation of the backup link. The Backup command is

described in more detail in chapter 3, “Operation” under the section “Console Commands”.

Follow this Configuration/Installation Sequence. If a hub is installed in a network

that includes two connections to another hub, until one of the connections can be

configured as a backup link, a loop in the network exists causing some network

performance degradation. For this reason, it is better to configure the backup link on the

hub before the hub is installed in the network. It is best to follow these steps:

1. Attach a console to the hub’s console port and start a console session. (For

instructions see step 4, “Customize the hub’s configuration” in chapter 2.)

2. Use the Backup command (BA) to complete the backup link configuration. (See

the Backup command description in chapter 3, or enter HE BA at the console

prompt for online help on the Backup command).

3. Complete the network cable connections between the monitoring hub and the

remote hub. (For instructions, see “Port Connections” in chapter 2.)

4. Enable the primary port with the Port command (enter PO n ON where n is

the primary port’s ID). This step is necessary because, without the cables

connected, the test packets cannot be successfully sent and the backup port is

activated. Once you enable the primary port, it assumes the active role.

5. On the remote hub, make sure that the ports connected to both the primary and

backup links are enabled (PO n ON). On the monitoring hub, the status of the

primary and backup ports is controlled by the hub’s firmware; you do not need to

explicitly enable the monitoring hub’s ports.

Backup Links E-3

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HP 24S Betriebsanweisung Seite 77