HP V1905 Series, Getting Started Manual

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109
Forgotten Static IP Address
If you forget the static IP address that you assigned to the switch, you can use the display ip command
through the Console Port (see “ CLI Reference Guide ”).
Solving LED Issues
This section lists some issues that are related to the LEDs on the front panel of the switch.

Gigabit Combo Ports (RJ-45/SFP)

Link/Activity Status LEDs
 Power LED
A link is connected, but the Link/Activity LED for the port is off
There is a problem with this connection. Verify that:

The switch being connected to is powered on and operating correctly.
 The cable is connected at both ends.

The cable is not damaged.

If the connection is to a workstation, that the workstation's network interface is installed and configured
correctly.
 The correct category of cable is being used for the required link speed. Category 3 cables can be used
for 10BASE-T operation only. Category 5 cable is required for 100BASE-TX or 1000BASE-T. HP
recommends Category 5e or 6 cables for 1000BASE-T operation.
A fiber cable is connected, but the Module Active LED is off
Verify that:

The fiber cable is in good condition.
 The SFP module is correctly inserted.
 A HP SFP module is being used.

The equipment at the far end is installed and correctly configured.
The Link/Activity LED is on, but network performance is poor
The switch supports full-duplex auto-negotiation. If the connected device does not support auto-negotiation,
ensure that it is configured for half-duplex operation only. If the connected device has auto-negotiation
disabled or overridden, and is configured as full-duplex, the switch will configure the link as half-duplex,
causing a mismatch that will reduce network performance when data is transmitting and receiving
simultaneously on the same link.
Ensure that the connected device has either:

Auto-negotiation enabled, or
 The ports are configured for half-duplex operation
All ports appear to show continual activity.
There may be broadcast storms on the network. Remove port connections one at a time, waiting a few
seconds between each port. If the LEDs go off after removing a port connection, the device that was