Specifications

Chapter 7. Maintenance and troubleshooting 307
Solution 1: Check the port configuration in the software (see the Command Reference for
your switch). If the port is configured with a specific speed or duplex mode, check the other
device to verify that it is set to the same configuration. If the switch port is set to
autonegotiate, verify that the other device is set to autonegotiate.
Solution 2: Check the cables that connect the port to the other device. Make sure that they
are connected. Verify that you are using the correct cable type.
Temperature sensor warning
Symptom: A temperature warning shows on the management console.
Solution: Make sure that the air circulation vents on the front, back, and sides of the switch
are free from obstruction by cables, panels, rack frames, or other materials.
Make sure that all cooling fans inside the switch are running. A Fan Module’s LED (rear
panel) flashes if there is a failure of the fan. Run the following command to show the
fan status:
show sys-info
If any fan stops during switch operation, contact IBM Support.
Switch does not initialize (boot)
Symptom: All the switch LEDs stay on, and the command prompt does not appear on
the console.
Solution: The operating system might be damaged. Use the console port to perform a serial
upgrade of the switch software. See the Command Reference guide for you switch, as listed
in “Related publications” on page 333.
7.4.3 Connectivity troubleshooting
In this section, you find basic information about how to troubleshoot the IP connectivity in a
network built on IBM System Networking switches. IBM switches come with a set of simple
tools that can be helpful for troubleshooting IP connectivity issues.
Ping
The ping command is a simple tool, based on a request-response mechanism, to verify
connectivity to a remote network node. The ping command is based on ICMP. The request is
an ICMP Echo packet and the reply is an ICMP Echo Reply. Like a regular IP packet, an
ICMP packet is forwarded based on the intermediate routers’ routing table until it reaches the
destination. After it reaches the destination, the ICMP Echo Reply packet is generated and
forwarded back to the originating node.
For example, to verify the connectivity from the ACC-2 switch used in Chapter 3, “Reference
architectures” on page 107 to the AGG-1 switch’s VLAN100 IP address (10.0.100.1), run the
command shown in Example 7-19.
Example 7-19 Ping command example
ACC-2#ping 10.0.100.1 data-port
Important: In IBM switches, ping sends an ICMP Echo packet out of the management
interface first. If you want to change that option, you need to add the data-port keyword to
a command as a parameter.