H3C Aolynk Unmanaged Switch User FAQs

Contents

Q.     Does the device have a Web configuration interface? Can I configure the device through the command line interface (CLI)?  1

Q.     What are the functions of the port isolation, Long-Distance, and DHCP snooping features, and what scenarios are these features suitable for?· 1

Q.     Does the device have a fan?· 1

Q.     How can I obtain the serial number of the device?· 1

Q.     What can I do if the device fails to start up after power connection?· 1

Q.     What can I do if the network port LED is not on after a terminal is connected to the switch?· 1

Q.     What can I do if the LEDs are normal but data transmission fails or a packet loss occurs after a terminal is connected to the switch?· 2

H3C Aolynk Unmanaged Switch User FAQs

This document contains the most frequently asked questions about H3C Aolynk unmanaged switches.

Q.     Does the device have a Web configuration interface? Can I configure the device through the command line interface (CLI)?

A.     The device does not have a Web configuration interface or a default IP address. You cannot configure the device through the CLI.

Q.     What are the functions of the port isolation, Long-Distance, and DHCP snooping features, and what scenarios are these features suitable for?

A.     The functions and suitable scenarios of the port isolation, Long-Distance, and DHCP snooping features are as follows:

·     Port isolation: Enables Layer 2 isolation between downstream ports. With this feature enabled, each port can communicate only with the uplink ports. This feature is suitable for scenarios that require high privacy on downstream networks, and can reduce broadcast storms and isolate DHCP broadcasts.

·     Long-Distance: Supported on PoE models. With this feature enabled, the speed of the specified port drops to 10 Mbps, and the maximum transmission distance reaches 250 meters (compatible terminals are required). This feature is suitable for scenarios with cameras or powered devices (PDs) that operate over 100 meters. As the transmission distance increases, the speed decreases accordingly.

·     DHCP snooping: With this feature enabled, downstream ports can obtain IP addresses only from the DHCP server connected to the uplink ports. It can ensure network security by restricting unauthorized device access, and is suitable for scenarios such as hotels and buildings.

Q.     Does the device have a fan?

A.     The device is fanless.

Q.     How can I obtain the serial number of the device?

A.     You can view the serial number on the device nameplate.

Q.     What can I do if the device fails to start up after power connection?

A.     To resolve the issue:

1.     Verify that the power supply is connected correctly.

2.     Verify that the power supply is turned on correctly.

Q.     What can I do if the network port LED is not on after a terminal is connected to the switch?

A.     To resolve the issue:

1.     Verify that the network cable is connected to the Ethernet port tightly.

2.     Connect each end of the network cable to an Ethernet port on the switch. If the LEDs for the ports are on, the network cable is not defective. If the LEDs are not on, the network cable is defective. Replace it with a known-good cable.

3.     Connect the terminal to another switch to verify that the terminal can operate correctly.

Q.     What can I do if the LEDs are normal but data transmission fails or a packet loss occurs after a terminal is connected to the switch?

A.     To resolve the issue, identify the failure reason and take the corresponding measures as follows:

·     Network configuration errors, including the following:

¡     Lack of an uplink switch, gateway, or DHCP server.

¡     Blocking of the switch's management VLAN on the interface.

¡     Absence of a static route to the switch segment on the egress gateway or core switch.

¡     Wired port error or network cable error on the uplink devices.

To resolve the issue:

a.     Check the VLAN, interface, and routing configurations of intermediate link devices, and complete any missing configurations if required.

b.     Examine the network ports and cables of the uplink devices for anomalies.

·     Unauthorized router devices or multiple DHCP servers in the environment

In this case, the switch might obtain an abnormal IP address and fail to access the Internet. To resolve the issue, enable DHCP snooping on the uplink switch.

·     DHCP server anomaly or exhausted address pool

In this case, the switch cannot obtain an IP address or renew the address lease. To resolve the issue, verify that the DHCP server is operating correctly.

·     IP address conflicts

If some devices or hosts in the environment are configured with static IP addresses, IP address conflicts might occur, preventing normal network access. To resolve the issue, locate the corresponding hosts or devices in the network and remove the static IP configuration that causes the issue.

·     Loop or abnormal broadcast/multicast flooding in the wired environment

This might cause severe packet loss or even network failure. To resolve the issue, enable loop prevention and broadcast/multicast suppression.

·     DHCP snooping configuration errors

If an unmanaged switch obtains its address from another device and the upstream switch has DHCP snooping enabled, the unmanaged switch will fail to acquire an address and cannot communicate when no trusted interfaces are configured.

·     Switch mode errors

If the switch is in port isolation mode, terminals connected to downstream ports cannot communicate with each other.