Troubleshooting

Diagnostic Tools

Port Auto-Negotiation

When a link LED does not light (indicating loss of link between two devices), the most common reason is a failure of port auto-negotiation between the connecting ports. If a link LED fails to light when you connect the switch to a port on another device, do the following:

1.Ensure that the switch port and the port on the attached end-node are both set to Auto mode.

2.If the attached end-node does not have an Auto mode setting, then you must manually configure the switch port to the same setting as the end- node port. Refer to Chapter 10, “Port Status and Configuration”.

 

Ping and Link Tests

 

The Ping test and the Link test are point-to-point tests between your switch

 

and another IEEE 802.3-compliant device on your network. These tests can

 

tell you whether the switch is communicating properly with another device.

 

 

N o t e

To respond to a Ping test or a Link test, the device you are trying to reach must

 

be IEEE 802.3-compliant.

 

Ping Test. This is a test of the path between the switch and another device

 

 

on the same or another IP network that can respond to IP packets (ICMP Echo

 

Requests). To use the ping (or traceroute) command with host names or fully

 

qualified domain names, refer to “DNS Resolver” on page C-71.

 

Link Test. This is a test of the connection between the switch and a desig­

 

nated network device on the same LAN (or VLAN, if configured). During the

 

link test, IEEE 802.2 test packets are sent to the designated network device

 

in the same VLAN or broadcast domain. The remote device must be able to

 

respond with an 802.2 Test Response Packet.

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