Cisco Nexus 1000V User manual

Cisco Systems, Inc.
www.cisco.com
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Addresses, phone numbers, and fax numbers
are listed on the Cisco website at
www.cisco.com/go/offices.
Cisco Nexus 1000V Troubleshooting
Guide, Release 5.2(1)SV3(1.1)
May 16, 2016
Text Part Number: OL-31393-01

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© 2016 Cisco Systems, Inc. All rights reserved.

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CONTENTS
New and Changed Information ii-xiii
Preface xvii
Audience xvii
Document Conventions xvii
Related Documentation xviii
Obtaining Documentation and Submitting a Service Request xx
CHAPTER 1Overview 1-1
Troubleshooting Process 1-1
Best Practices 1-1
Troubleshooting Basics 1-2
Troubleshooting Guidelines 1-2
Gathering Information 1-2
Verifying Ports 1-3
Verifying Layer 2 Connectivity 1-3
Verifying Layer 3 Connectivity 1-3
Overview of Symptoms 1-4
System Messages 1-4
System Message Text 1-4
syslog Server Implementation 1-5
Troubleshooting with Logs 1-6
Viewing Logs 1-6
Cisco Support Communities 1-7
Contacting Cisco or VMware Customer Support 1-7
CHAPTER 2Troubleshooting Tools 2-1
Commands 2-1
Ping 2-1
Traceroute 2-2
Monitoring Processes and CPUs 2-2
Identifying the Running Processes and their States 2-2

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Displaying CPU Utilization 2-3
Displaying CPU and Memory Information 2-4
RADIUS 2-4
Syslog 2-5
CHAPTER 3Installation 3-1
Isolating Installation Problems 3-1
Verifying Your VMware License Version 3-1
Host is Not Visible from the Distributed Virtual Switch 3-2
Refreshing the vCenter Server Connection 3-3
Improving Performance on the ESX and VM 3-4
Verifying the Domain Configuration 3-4
Verifying the Port Group Assignments for a VSM VM Virtual Interface 3-4
Verifying VSM and vCenter Server Connectivity 3-5
Troubleshooting Connections to vCenter Server 3-5
Recovering the Network Administrator Password 3-6
Managing Extension Keys 3-6
Known Extension Problems and Resolutions 3-7
Resolving a Plug-In Conflict 3-7
Finding the Extension Key on the Cisco Nexus 1000V 3-7
Finding the Extension Key Tied to a Specific DVS 3-8
Verifying Extension Keys 3-8
Recreating the Cisco Nexus 1000V Installation 3-10
Removing Hosts from the Cisco Nexus 1000V DVS 3-11
Removing the Cisco Nexus 1000V from the vCenter Server 3-11
Unregistering the Extension Key in the vCenter Server 3-12
Problems with the Cisco Nexus 1000V Installation Management Center 3-14
CHAPTER 4Licenses 4-1
Information About Licenses 4-1
Contents of the License File 4-2
Prerequisites to License Troubleshooting 4-2
Problems with Licenses 4-3
License Troubleshooting Commands 4-4
CHAPTER 5Upgrades 5-1
Information About Upgrades 5-1

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Problems with the In-Service Software Upgrade 5-1
Problems with the VEM Upgrade 5-5
Problems with the GUI Upgrade 5-6
Recovering a Secondary VSM with Active Primary 5-7
Recovering a Primary VSM with Active Secondary 5-12
Problems with VSM-VEM Layer 2 to 3 Conversion Tool 5-16
Upgrade Troubleshooting Commands 5-16
CHAPTER 6High Availability 6-1
Information About High Availability 6-1
System-Level High Availability 6-2
Network-Level High Availability 6-2
Problems with High Availability 6-2
High Availability Troubleshooting Commands 6-5
CHAPTER 7VSM and VEM Modules 7-1
Information About Modules 7-1
Troubleshooting a Module Not Coming Up on the VSM 7-1
Guidelines for Troubleshooting Modules 7-2
Flowchart for Troubleshooting Modules 7-3
Problems with the VSM 7-4
Verifying the VSM Is Connected to vCenter Server 7-6
Verifying the VSM Is Configured Correctly 7-7
Checking the vCenter Server Configuration 7-10
Checking Network Connectivity Between the VSM and the VEM 7-10
Recovering Management and Control Connectivity of a Host When a VSM is Running on a VEM 7-12
Checking the VEM Configuration 7-14
Collecting Logs 7-16
VSM and VEM Troubleshooting Commands 7-17
CHAPTER 8L3Sec 8-1
Troubleshooting L3Sec 8-1
CHAPTER 9Ports 9-1
Information About Ports 9-1
Information About Interface Characteristics 9-1
Information About Interface Counters 9-2
Information About Link Flapping 9-2

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Information About Port Security 9-2
Port Diagnostic Checklist 9-3
Problems with Ports 9-3
Cannot Enable an Interface 9-4
Port Link Failure or Port Not Connected 9-4
Link Flapping 9-5
Port ErrDisabled 9-6
VM Cannot Ping a Secured Port 9-7
Port Security Violations 9-8
Port State is Blocked on a VEM 9-9
Port Troubleshooting Commands 9-9
CHAPTER 10 Port Profiles 10-1
Information About Port Profiles 10-1
Problems with Port Profiles 10-2
Recovering a Quarantined Offline Interface 10-4
Port Profile Logs 10-5
Port Profile Troubleshooting Commands 10-5
CHAPTER 11 Port Channels and Trunking 11-1
Information About Port Channels and Trunking 11-1
Port Channel Overview 11-1
Port Channel Restriction 11-2
Trunking Overview 11-2
Initial Troubleshooting Checklist 11-2
Troubleshooting Asymmetric Port Channels 11-3
Cannot Create Port Channel 11-4
Newly Added Interface Does Not Come Online In a Port Channel 11-4
Forcing Port Channel Characteristics onto an Interface 11-4
Verifying a Port Channel Configuration 11-5
VLAN Traffic Does Not Traverse Trunk 11-5
CHAPTER 12 Layer 2 Switching 12-1
Information About Layer 2 Ethernet Switching 12-1
Port Model 12-1
Viewing Ports from the VEM 12-2
Viewing Ports from the VSM 12-3
Port Types 12-4

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Layer 2 Switching Problems 12-4
Verifying a Connection Between VEM Ports 12-4
Verifying a Connection Between VEMs 12-5
Isolating Traffic Interruptions 12-6
Layer 2 Switching Troubleshooting Commands 12-7
Troubleshooting Microsoft NLB Unicast Mode 12-12
Limitations and Restrictions 12-12
Disabling Automatic Static MAC Learning on a vEthernet Interface 12-12
Checking Status on a VSM 12-12
Checking the Status on a VEM 12-13
Configuring MS NLB for Multiple VM NICs in the Same Subnet 12-13
Troubleshooting BPDU Guard 12-14
BPDU Guard Troubleshooting Commands 12-14
CHAPTER 13 VLANs 13-1
Information About VLANs 13-1
Initial Troubleshooting Checklist 13-2
Cannot Create a VLAN 13-3
CHAPTER 14 Private VLANs 14-1
Information About Private VLANs 14-1
Private VLAN Domains 14-1
Spanning Multiple Switches 14-1
Private VLAN Ports 14-2
Troubleshooting Guidelines 14-2
Private VLAN Troubleshooting Commands 14-2
CHAPTER 15 NetFlow 15-1
Information About NetFlow 15-1
NetFlow Troubleshooting Commands 15-1
Common NetFlow Problems 15-2
Debugging a Policy Verification Error 15-3
Debugging Statistics Export 15-3
CHAPTER 16 ACLs 16-1
Information About Access Control Lists 16-1
ACL Configuration Limits 16-1

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ACL Restrictions 16-2
ACL Troubleshooting Commands 16-2
Displaying ACL Policies on the VEM 16-2
Debugging Policy Verification Issues 16-3
Troubleshooting ACL Logging 16-3
Using the CLI to Troubleshoot ACL Logging on a VEM 16-4
ACL Logging Troubleshooting Scenarios 16-5
CHAPTER 17 Quality of Service 17-1
Information About Quality of Service 17-1
QoS Configuration Limits 17-1
QoS Troubleshooting Commands 17-2
Troubleshooting the VEM 17-3
Debugging Policy Configuration Errors 17-4
Debugging Policy Verification Failures 17-5
Debugging Policing Configuration Errors 17-6
CHAPTER 18 SPAN 18-1
Information About SPAN 18-1
SPAN Session Guidelines 18-1
Problems with SPAN 18-2
SPAN Troubleshooting Commands 18-3
CHAPTER 19 Multicast IGMP 19-1
Information About Multicast 19-1
Multicast IGMP Snooping 19-1
Problems with Multicast IGMP Snooping 19-2
Troubleshooting Guidelines 19-2
IGMP Snooping Debugging Commands 19-2
Multicast IGMP Snooping Troubleshooting Commands 19-6
Problems with Multicast IGMP Snooping 19-9
CHAPTER 20 DHCP, DAI, and IPSG 20-1
Information About DHCP Snooping 20-1
Information About Dynamic ARP Inspection 20-2
Information About IP Source Guard 20-2
Guidelines and Limitations for Troubleshooting 20-2

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Problems with DHCP Snooping 20-3
Troubleshooting Dropped ARP Responses 20-4
Problems with IP Source Guard 20-5
Collecting and Evaluating Logs 20-5
VSM Logging 20-5
Host Logging 20-6
DHCP, DAI, and IPSG Troubleshooting Commands 20-6
CHAPTER 21 Storm Control 21-1
Information About Storm Control 21-1
Troubleshooting Storm Control 21-1
Troubleshooting VSM Commands 21-1
Troubleshooting VEM Commands 21-1
Debugging Storm Control on a VEM 21-2
CHAPTER 22 System 22-1
Information About the System 22-1
General Restrictions for vCenter Server 22-2
Extension Key 22-2
Recovering a DVS 22-2
Recovering a DVS With a Saved Copy of the VSM 22-3
Recovering a DVS Without a Saved Copy of the VSM 22-4
Problems Related to VSM and vCenter Server Connectivity 22-5
Connection Failure After ESX Reboot 22-6
Setting the System MTU 22-7
Recovering Lost Connectivity Due to MTU Mismatch 22-8
VSM Creation 22-9
Port Profiles 22-9
Problems with Port Profiles 22-10
Problems with Hosts 22-10
Problems with VM Traffic 22-10
VEM Troubleshooting Commands 22-11
VEM Log Commands 22-12
Error Messages 22-12
CHAPTER 23 Before Contacting Technical Support 23-1
Cisco Support Communities 23-1

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Gathering Information for Technical Support 23-1
Obtaining a File of Core Memory Information 23-2
Copying Files 23-3
CHAPTER 24 Network Segmentation Manager 24-1
Information About Network Segmentation Manager 24-1
Problems with Network Segmentation Manager 24-2
Network Segmentation Manager Troubleshooting Commands 24-7
CHAPTER 25 VXLANs 25-1
Information About VXLANs 25-1
Overview 25-1
VXLAN Tunnel EndPoint 25-2
VXLAN Gateway 25-2
VXLAN Trunks 25-3
VXLAN Border Gateway Protocol Control Plane 25-3
Multi-MAC Capability 25-8
Fragmentation 25-8
Scalability 25-8
Supported Features 25-9
VXLAN Troubleshooting Commands 25-9
VSM Commands 25-9
VXLAN Gateway Commands 25-11
VEM Commands 25-14
VEM Packet Path Debugging 25-16
VEM Multicast Debugging 25-17
VXLAN Data Path Debugging 25-18
vemlog Debugging 25-18
Vempkt 25-19
Statistics 25-20
show Commands 25-20
CHAPTER 26 VSI Discovery and Configuration Protocol 26-1
Information About VDP 26-1
Problems with VDP 26-2
VDP Troubleshooting Commands 26-2
VSM Commands 26-2
VEM Commands 26-4

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CHAPTER 27 Cisco TrustSec 27-1
Information About Cisco TrustSec 27-1
Cisco TrustSec Troubleshooting Commands 27-1
Debugging Commands 27-2
Host Logging Commands 27-2
show Commands 27-4
Problems with Cisco TrustSec 27-5
CHAPTER 28 vCenter Plug-in 28-1
Information About vCenter Plug-in 28-1
Prerequisites for VMware vSphere Web Client 28-1
Generating a Log Bundle 28-2
CHAPTER 29 Ethanalyzer 29-1
Using Ethanalyzer 29-1

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New and Changed Information
This section describes the information in this document that is either new or has changed with each
release.
To find additional information about new features or command changes, see the following:
•Release Notes.
•Command Reference.
Feature Description
Changed in
release Where Documented
VSI Discovery and
Configuration Protocol
Added new section for troubleshooting
commands for the VSI Discovery and
Configuration Protocol (VDP).
4.2(1)SV2(2.2) VSI Discovery and Configuration
Protocol
VXLAN Gateway Added a section for troubleshooting
commands for VXLAN Gateway.
Note Starting with Release
5.2(1)SV3(1.15), Cisco Nexus
1000V for VMware vSphere does
not support the VXLAN Gateway
feature.
4.2(1)SV2(2.1) VXLANs
Upgrade Added section for problems with
VSM-VEM Layer 2 to 3 Conversion Tool.
4.2(1)SV2(1.1) Upgrades
Ethanalyzer Added Ethanalyzer as a Cisco Nexus
1000V protocol analyzer tool content.
4.2(1)SV2(1.1) Ethanalyzer
DHCP Enhancements Added the troubleshooting commands for
DHCP.
4.2(1)SV2(1.1) DHCP, DAI, and IPSG
Troubleshooting Commands
High Availability Updated the high availability section.
Added a command output for the new
show system internal active-active
remote accounting logs command and
updated the output for the show system
redundancy status command.
4.2(1)SV2(1.1) High Availability

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New and Changed Information
Licensing Added the svs license transfer src-vem
vem no license_pool command to
troubleshoot the issues with checking out
the licenses or returning them to the
license pool.
4.2(1)SV2(1.1) License Troubleshooting
Commands
Nexus 1000V VC Plugin
Installation
Added a new section to troubleshoot the
Cisco Nexus 1000V VC plugin
installation.
4.2(1)SV2(1.1) vCenter Plug-in
Nexus 1000V Installation
Management Center
Added a new section to troubleshoot the
Cisco Nexus 1000V Installation
Management Center.
4.2(1)SV1(5.1) Problems with the Cisco Nexus
1000V Installation Management
Center
Recovering Management
and Control Connectivity
of a Host
Added a new section to recover
management and control connectivity of a
host when a VSM is running on a VEM.
4.2(1)SV1(5.1) Recovering Management and
Control Connectivity of a Host
When a VSM is Running on a VEM
ACL Logging Added a new section to troubleshoot ACL
Logging.
4.2(1)SV1(5.1) Troubleshooting ACL Logging
NSM Added a new chapter to troubleshoot the
Network Segmentation Manager (NSM).
4.2(1)SV1(5.1) Network Segmentation Manager
VXLAN Added a new chapter to troubleshoot the
Virtual Extensible Local Area Network
(VXLAN).
4.2(1)SV1(5.1) VXLANs
Microsoft NLBUnicast
Mode
Added a new section for troubleshooting
Microsoft Network Load Balancing
(NLB) unicast mode.
4.2(1)SV1(5.1) Layer 2 Switching
In service software
upgrade (ISSU)
Added a new section for troubleshooting
ISSU.
4.2(1)SV1(4a) Upgrades
VEM software upgrade Added a new section for troubleshooting a
VEM software upgrade.
4.2(1)SV1(4a) Upgrades
DHCP, DAI, IPSG Added a new section for troubleshooting
DHCP, Dynamic ARP Inspection, and IP
Source Guard.
4.2(1)SV1(4) DHCP, DAI, and IPSG
Port profiles Added a new section for port profiles and
new information about quarantined port
profiles.
4.2(1)SV1(4) Port Profiles
Upgrade Added a new section for troubleshooting
upgrade problems.
4.2(1)SV1(4) Upgrades
VEM health check Added information about the VEM health
check that shows the cause of a
connectivity problem.
4.0(4)SV1(3) Checking Network Connectivity
Between the VSM and the VEM
Feature Description
Changed in
release Where Documented

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New and Changed Information
Storm Control Added information about how to identify
and resolve the problems related to storm
control.
5.2(1)SV3(1.1) Storm Control
L3Sec Added information about how to secure
the internal control plane communications
(Control and Packet traffic) of Cisco
Nexus 1000V in a more robust way than in
previous releases. It operates only in Layer
3 control mode.
5.2(1)SV3(1.1) L3Sec
Feature Description
Changed in
release Where Documented

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New and Changed Information

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Preface
The Troubleshooting document provides information about how to recognize a problem, determine its
cause, and find possible solutions.
This preface describes the following aspects of this document:
•Audience, page xvii
•Document Conventions, page xvii
•Related Documentation, page xviii
•Obtaining Documentation and Submitting a Service Request, page xx
Audience
This publication is for experienced network administrators who configure and maintain a Cisco Nexus
1000V.
Document Conventions
Command descriptions use these conventions:
Screen examples use these conventions:
Convention Description
boldface font Commands and keywords are in boldface.
italic font Arguments for which you supply values are in italics.
[ ] Elements in square brackets are optional.
[ x | y | z ] Optional alternative keywords are grouped in brackets and separated by vertical
bars.
string A nonquoted set of characters. Do not use quotation marks around the string or
the string will include the quotation marks.
screen font Terminal sessions and information that the switch displays are in screen font.
boldface screen
font
Information that you must enter is in boldface screen font.

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This document uses the following conventions:
Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Caution Means reader be careful. In this situation, you might do something that could result in equipment
damage or loss of data.
Related Documentation
This section lists the documents used with the Cisco Nexus 1000 and available on Cisco.com at the
following URL:
http://www.cisco.com/en/US/products/ps9902/tsd_products_support_series_home.html
General Information
Cisco Nexus 1000V Documentation Roadmap
Cisco Nexus 1000V Release Notes
Cisco Nexus 1000V Compatibility Information
Install and Upgrade
Cisco Nexus 1000V Installation and Upgrade Guide
Configuration Guides
Cisco Nexus 1000V High Availability and Redundancy Configuration Guide
Cisco Nexus 1000V Interface Configuration Guide
Cisco Nexus 1000V Layer 2 Switching Configuration Guide
Cisco Nexus 1000V License Configuration Guide
Cisco Nexus 1000V Network Segmentation Manager Configuration Guide
Cisco Nexus 1000V Port Profile Configuration Guide
Cisco Nexus 1000V Quality of Service Configuration Guide
Cisco Nexus 1000V REST API Plug-in Configuration Guide
Cisco Nexus 1000V Security Configuration Guide
italic screen font Arguments for which you supply values are in italic screen font.
< > Nonprinting characters, such as passwords, are in angle brackets.
[ ] Default responses to system prompts are in square brackets.
!, # An exclamation point (!) or a pound sign (#) at the beginning of a line of code
indicates a comment line.

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Cisco Nexus 1000V System Management Configuration Guide
Cisco Nexus 1000V vCenter Plugin Configuration Guide
Cisco Nexus 1000V VXLAN Configuration Guide
Cisco Nexus 1000V VDP Configuration Guide
Cisco Nexus 1000V DFA Configuration Guide
Cisco Nexus 1000V vCenter Plugin Configuration Guide
Programming Guide
Cisco Nexus 1000V XML API User Guide
Reference Guides
Cisco Nexus 1000V Command Reference
Cisco Nexus 1000V Resource Availability Reference
Troubleshooting, Password Recovery, System Messages Guides
Cisco Nexus 1000V Troubleshooting Guide
Cisco Nexus 1000V Password Recovery Guide
Cisco NX-OS System Messages Reference
Virtual Services Appliance Documentation
The Cisco Nexus Virtual Services Appliance (VSA) documentation is available at
http://www.cisco.com/en/US/products/ps9902/tsd_products_support_series_home.html
Virtual Security Gateway Documentation
The Cisco Virtual Security Gateway documentation is available at
http://www.cisco.com/en/US/products/ps13095/tsd_products_support_series_home.html
Virtual Network Management Center
The Cisco Virtual Network Management Center documentation is available at
http://www.cisco.com/en/US/products/ps11213/tsd_products_support_series_home.html
Virtual Wide Area Application Services (vWAAS)
The Virtual Wide Area Application Services documentation is available at
http://www.cisco.com/en/US/products/ps6870/tsd_products_support_series_home.html
ASA 1000V Cloud Firewall
The ASA 1000V Cloud Firewall documentation is available at
http://www.cisco.com/en/US/products/ps12233/tsd_products_support_series_home.html

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Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a
service request, and gathering additional information, see What’s New in Cisco Product Documentation
at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html.
Subscribe to What’s New in Cisco Product Documentation, which lists all new and revised Cisco technical
documentation, as an RSS feed and deliver content directly to your desktop using a reader application. The
RSS feeds are a free service.