Troubleshooting Interface Problems; Troubleshooting When A Workstation Is Unable To Log In To The Network - Cisco Catalyst 9400 System Management Configuration Manual

Troubleshooting the Software Configuration

Troubleshooting Interface Problems

If you see an error mentioned in the output of the command, show interface command, the reason could be:
• A physical layer problem, such as a faulty cable or NIC
• A configuration problem, such as a speed and duplex mismatch
• A performance problem, such as an oversubscription.
To understand and troubleshoot thses problems, refer the Troubleshooting Switch Port and Interface Problems
at http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015bfd6.shtml
Troubleshooting when a Workstation Is Unable to Log In to the
Network
If you observe that a workstation is unable to log into the network during startup or unable to obtain the DHCP
address when you have powered up a client machine or rebooted, an initial connectivity delay that the switch
introduced could be the problem. To verify this, check the following:
• Microsoft network client displays "No Domain Controllers Available".
• DHCP reports "No DHCP Servers Available".
• A Novell Internetwork Packet Exchange (IPX) network workstation does not have the Novell login
• An AppleTalk network client displays, "Access to your AppleTalk network has been interrupted. In order
• IBM Network stations can have one of these messages:
The reason for these symptoms can be an interface delay that either Spanning Tree Protocol (STP),
EtherChannel, trunking, or an autonegotiation delay causes.
If the status is "power-bad," the switch detects a switching module but is unable to allocate power. This
situation is possible if the supervisor engine is unable to access the serial PROM (SPROM) contents on
the module in order to determine the identification of the line card. Enter the show idprom module slot
command to verify that the SPROM is readable. If the SPROM is not accessible, reset the module.
Enter the show diagnostics online module slot-number command to identify hardware failures on the
module. If the module still does not come online, create a service request with Cisco Technical Support
in order to troubleshoot further. Use the logs of the switch that you collected in the above output and the
troubleshooting steps that you performed.
screen upon bootup.
to reestablish your connection, open and close the AppleTalk control panel." The AppleTalk client chooser
application can either fail to display a zone list or display an incomplete zone list.
• NSB83619—Address resolution failed
• NSB83589—Failed to boot after 1 attempt
• NSB70519—Failed to connect to a server
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
Troubleshooting Interface Problems
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