HP J3188A manual BAckup, Default Description

Managing the Hub

Console Command Reference

BAckup

To configure one of the hub’s ports for dedicated use in a backup (redundant) link to another hub.

An HP Hub-16M allows you to use any two of its network ports for a redundant link to another hub in your network. The backup link normally carries no traffic, but it is automatically activated if the primary link fails. Note that any of the ports can be the backup port to any other port.

When you enter the Backup command, you are prompted for these values:

	Default	Description
Backup Port	Disabled	The port used for the backup link. Enter the port ID.
		Or, enter DI (for disable) if you wish to remove an
		existing backup link configuration.
Primary Port	None	The port used for the primary link. Enter the port ID.
Remote MAC	000000-000000	The 12-digit hexadecimal MAC address of the hub at
address		the remote end of the critical link.
Seconds Between	1 second	How often you want the hub to send an IEEE 802.2
Test Packets		Test packet to the remote hub over the primary link.
Consecutive	2 failures	The number of consecutive Test packet response
Failures		failures that will trigger activation of the backup link.
		For example, enter 5 to activate the backup link on
		the fifth failure.

The hub monitors the primary link by sending IEEE 802.2 Test packets at the specified frequency to the specified remote hub. If “n” consecutive Response packets are not returned from the remote hub, the primary port is disabled and the backup port is enabled.

When the primary link is repaired, you must re-enable the primary port by using the Port command. It is not automatically re-enabled. When the primary port is re-enabled, the backup port is disabled automatically and returned to backup mode. See the appendix on Backup Links. This appendix also covers more information on backup links, including requirements, limitations, and sample topologies.

Managing the Hub

3-5