Cisco Nexus 9000 Series

To Next Page

To Previous Page

PurposeCommand or Action

Example:

switch(config)# spanning-tree vlan 12

root secondary

Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x

Troubleshooting STP

Securing the Network Against Forwarding Loops

Main Page

Default Chapter3
- Table of Contents3
Preface9
- Audience9
- Document Conventions9
- Related Documentation for Cisco Nexus 9000 Series Switches10
- Documentation Feedback10
- Obtaining Documentation and Submitting a Service Request11
C H a P T E13
New and Changed Information13
C H a P T E15
- Verifying Ports16
- Verifying Layer 2 Connectivity16
- Verifying Layer 3 Connectivity17
- Symptoms17
  - System Messages18
  - Syslog Server Implementation18
- Troubleshooting with Logs20
- Troubleshooting Modules20
- Viewing NVRAM Logs20
- Contacting Customer Support21
Overview15
- Software Image15
- About the Troubleshooting Process15
Troubleshooting Installations, Upgrades, and Reboots23
- About Upgrades and Reboots23
- Upgrade and Reboot Checklist23
- Verifying Software Upgrades24
- Verifying a Nondisruptive Upgrade24
- Troubleshooting Software Upgrades and Downgrades25
  - Software Upgrade Ends with Error25
  - Upgrading the Cisco NX-OS Software25
- Troubleshooting Software System Reboots26
Troubleshooting Licensing Issues45
- About Troubleshooting Licensing Issues45
- Guidelines and Limitations for Licensing45
- Initial Troubleshooting Checklist for Licensing46
- Displaying License Information Using the CLI46
- Licensing Installation Issues47
Troubleshooting Ports49
- About Troubleshooting Ports49
- Guidelines and Limitations for Troubleshooting Ports49
- Initial Port Troubleshooting Checklist50
- Viewing Port Information50
- Troubleshooting Port Statistics from the CLI51
- Troubleshooting Port-Interface Issues51
Troubleshooting Vpcs57
- About Troubleshooting Vpcs57
- Initial Troubleshooting Vpcs Checklist57
- Chapter57
- Verifying Vpcs Using the CLI58
- Received Type 1 Configuration Element Mismatch59
- Cannot Enable the Vpc Feature60
- Vpcs in Blocking State60
- Vlans on a Vpc Moved to Suspend State60
- Hosts with an HSRP Gateway Cannot Access Beyond Their VLAN61
Troubleshooting Vlans63
- About Troubleshooting Vlans63
- Guidelines and Limitations for Troubleshooting Vlans63
- Initial Troubleshooting Vlans Checklist64
- Troubleshooting VLAN Issues65
Troubleshooting STP67
- About Troubleshooting STP67
- Initial Troubleshooting STP Checklist67
- Troubleshooting STP Data Loops68
- Troubleshooting Excessive Packet Flooding71
- Troubleshooting Convergence Time Issues72
- Securing the Network against Forwarding Loops72
Chapter 9 Troubleshooting Routing75
- About Troubleshooting Routing Issues75
- Initial Troubleshooting Routing Checklist75
- Troubleshooting Routing76
- Troubleshooting Policy-Based Routing79
C H a P T E81
Troubleshooting Memory81
- About Troubleshooting Memory81
- General/High Level Assessment of Platform Memory Utilization82
- User Processes82
  - Determining Which Process Is Using a Lot of Memory83
- Built-In Platform Memory Monitoring83
  - Memory Thresholds83
Troubleshooting Packet Flow Issues85
- Packet Flow Issues85
  - Packets Dropped Because of Rate Limits85
  - Packets Dropped Because of Copp85
C H a P T E87
Troubleshooting Poweron Auto Provisioning87
- Switch Does Not Come up in Time for POAP to Complete87
- POAP Fails87
Troubleshooting the Python API89
- Receiving Python API Errors89
C H a P T E93
Troubleshooting NX-API93
- NX-API Guidelines93
- NX-API Is Not Responding93
- Configuration Fails94
- Permission Is Denied for Bash94
- Output Cannot be Retrieved from the Browser Sandbox94
- CLI Command Errors Are Appearing94
- Error Messages Are Appearing94
- Temporary Files Are Disappearing95
- Chunks of the Command Output Are Not Being Delivered95
C H a P T E97
Troubleshooting Service Failures97
- Identifying Memory Allocations for Processes97
- Identifying CPU Utilization for Processes98
- Monitoring Process Core Files99
- Processing the Crash Core Files99
- Clearing the Core99
- Enabling Auto-Copy for Core Files100
C H a P T E101
Before Contacting Technical Support101
- Steps to Perform before Calling TAC101
- Copying Files to or from Cisco NX-OS103
- Using Core Dumps104
Troubleshooting Tools and Methodology105
- Command-Line Interface Troubleshooting Commands105
  - Consistency Checker Commands106
- Configuration Files107
- CLI Debug107
  - Debug Filters108
- Ping and Traceroute108
  - Using Ping108
  - Using Traceroute109
- Monitoring Processes and Cpus110
  - Using the Show Processes Cpu Command111
  - Using the Show System Resources Command112
- Using Onboard Failure Logging112
- Using Diagnostics113
- Using Embedded Event Manager114
- Using Ethanalyzer114
- SNMP and RMON Support116
- Using the PCAP SNMP Parser116
- Using RADIUS118
- Using Syslog118
  - Logging Levels119
  - Enabling Logging for Telnet or SSH119
- Using SPAN120
- Using the Blue Beacon Feature120
- Using the Watch Command120
- Additional References for Troubleshooting Tools and Methodology121
- Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release121

Cisco Nexus 9000 Series - Page 74

Table of Contents

Other manuals for Cisco Nexus 9000 Series

Related product manuals