Cisco Nexus 7000 Series NX-OS Troubleshooting Guide -- Before Contacting Technical Support
This article describes the steps to perform before calling for technical support for Cisco NX-OS.
Troubleshooting Installs, Upgrades, and Reboots
Before Contacting Technical Support (this section)
Troubleshooting Tools and Methodology
|Note:||If you purchased Cisco support through a Cisco reseller, contact the reseller directly. If you purchased support directly from Cisco, contact Cisco Technical Support.|
Steps to Perform Before Calling TAC
At some point, you may need to contact your technical support representative or Cisco TAC for some additional assistance. This section outlines the steps that you should perform before you contact your next level of support in order to reduce the amount of time spent resolving the issue.
|Note:||Do not reload the module or the system until you have completed Xref_Colorparanum. Some logs and counters are kept in volatile storage and will not survive a reload.|
To prepare for contacting your customer support representative, follow these steps:
1. Collect the system information and configuration. You should collect this information before and after the issue has been resolved. Use one of the following three methods to gather this information:
- Configure your Telnet or SSH application to log the screen output to a text file. Use the terminal length 0 command and then use the show tech-support details command.
- Use the tac-pac filename command to redirect the output of the show tech-support details command to a file, and then gzip the file.
- switch# tac-pac bootflash://showtech.switch1
- If you do not specify a filename, Cisco NX-OS creates the file as volatile:show_tech_out.gz. Copy the file from the device using the procedure in the Copying Files to or from Cisco NX-OS section.
2. If an error occurs in DCNM, take a screen shot of the error. In Windows, press Alt+PrintScreen to capture the active window, or press PrintScreen to capture the entire desktop. Paste the screenshot into a new Microsoft Paint (or similar program) session and save the file.
3. Capture the exact error codes that you see in the message logs from either DCNM or the CLI.
- a. Choose Event Browser in DCNM to see the recent list of messages generated.
- b. Copy the error from the message log, which you can display using either the show logging log command or the show logging last number command to view the last lines of the log.
4. Answer the following questions before you contact your technical support representative:
- On which switch or port is the problem occurring?
- Which Cisco NX-OS software, driver versions, operating systems versions, and storage device firmware are in your fabric?
- What is the network topology? (In DCNM, choose Topology > Save layout.)
- Were any changes made to the environment (VLANs, adding modules, upgrades) prior to or at the time of this event?
- Are there other similarly configured devices that could have this problem, but do not?
- Where was this problematic device connected (which switch and interface)?
- When did this problem first occur?
- When did this problem last occur?
- How often does this problem occur?
- How many devices have this problem?
- Were any traces or debug output captured during the problem time? What troubleshooting steps have you attempted? Which, if any, of the following tools were used?
- Ethanalyzer, local or remote SPAN
- CLI debug commands
- traceroute, ping
- DCNM tools
5. Answer the following questions if your problem is related to a software upgrade attempt:
- What was the original Cisco NX-OS version?
- What is the new Cisco NX-OS version?
- Collect the output from the following commands and forward them to your customer support representative:
- show install all status
- show system internal log install
- show system internal log install details
- show log nvram
Copying Files to or from Cisco NX-OS
You may need to move files to or from the device. These files may include the log, configuration, or firmware files.
Cisco NX-OS offers a broad range of protocols to use for copying to or from the device. The device always acts as a client, so that an ftp, scp, or tftp session always originates from Cisco NX-OS and either pushes files to an external system or pulls files from an external system.
- File Server: 172.22.36.10
- File to be copied to the switch: /etc/hosts
The copy command supports the ftp, scp, sftp, and tftp transfer protocols as well as 12 different sources for copying files.
- switch# copy ?
bootflash: Select source filesystem core: Select source filesystem debug: Select source filesystem ftp: Select source filesystem licenses: Backup license files log: Select source filesystem modflash: Select source filesystem nvram: Select source filesystem running-config: Copy running configuration to destination scp: Select source filesystem sftp: Select source filesystem slot0: Select source filesystem startup-config: Copy startup configuration to destination system: Select source filesystem tftp: Select source filesystem volatile: Select source filesystem
You can use secure copy (scp) as the transfer mechanism, as follows:
This example copies /etc/hosts from 172.22.36.10 to hosts.txt, for user user1:
- switch# copy scp://email@example.com/etc/hosts bootflash:hosts.txt
firstname.lastname@example.org's password: hosts 100% |*****************************| 2035 00:00
This example backs up the startup-configuration to a sftp server:
- switch# copy startup-config sftp://email@example.com/test/startup configuration.bak1
Connecting to 172.22.36.10... User1@172.22.36.10's password: switch#
Tip: You should back up the startup-configuration to a server on a daily basis and prior to any changes. You could write a short script to run on Cisco NX-OS to perform a save and then a backup of the configuration. The script needs to contain two commands: copy running-configuration startup-configuration and copy startup-configuration tftp://server/name. To execute the script, use the run-script filename command.
Using Core Dumps
Core dumps contain detailed information about the system and software status prior to a crash. Use core dumps in situations where unknown problems exist. You can send core dumps to a TFTP server or to a Flash card in slot0: of the local system. You should set up your system to generate core dumps under the instruction of your technical support representative. Core dumps are decoded by technical support engineers.
Set up core dumps to go to a TFTP server so that you can e-mail these core dumps directly to your technical support representative.
Setting Up Core Dumps Using the CLI
Use the system cores command to set up core dumps on your system as follows:
- switch# system cores tftp://10.91.51.200/jsmith_cores
- switch# show system cores
- Cores are transferred to tftp://10.91.51.200/jsmith_cores
|Note:||The filename (indicated by jsmith_cores) must exist in the TFTP server directory.|