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12-4
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
Chapter 12 Layer 2 Switching
Layer 2 Switching Problems
Port Types
The following types of ports are available:
•
vEths can be associated with any one of the following:
– VNICs of a Virtual Machine on the ESX host.
–
VTEPs of the ESX Host
– VSWIFs of an ESX COS Host.
•
Eths (physical Ethernet interfaces)—Correspond to the Physical NICs on the ESX host.
• Po (port channel interfaces)—The physical NICs of an ESX Host can be bundled into a logical
interface. This logical bundle is referred to as a port channel interface.
For more information about Layer 2 switching, see the Cisco Nexus 1000V Layer 2 Switching
Configuration Guide .
Layer 2 Switching Problems
This section describes how to troubleshoot Layer 2 problems and lists troubleshooting commands. This
section includes the following topics:
• Verifying a Connection Between VEM Ports, page 12-4
•
Verifying a Connection Between VEMs, page 12-5
• Isolating Traffic Interruptions, page 12-6
Verifying a Connection Between VEM Ports
You can verify a connection between two vEth ports on a VEM.
Step 1
View the state of the VLANs associated with the port. If the VLAN associated with a port is not active,
the port may be down. In this case, you must create the VLAN and activate it.
switch# show vlan v lan-id
Step 2
View the state of the ports on the VSM.
switch# show interface brief
Step 3
Display the ports that are present on the VEM, their local interface indices, VLAN, type (physical or
virtual), port mode and port name.
switch# module vem module-number execute vemcmd show port
The key things to look for in the output are as follows:
• State of the port.
•
CBL.
• Mode.
•
Attached device name.
• The LTL of the port that you are trying to troubleshoot. It will help you to identify the interface
quickly in other VEM commands where the interface name is not displayed.