CHAPTER
9-1
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
9
Ports
This chapter describes how to identify and resolve problems with ports and includes the following
sections:
• Information About Ports, page 9-1
• Port Diagnostic Checklist, page 9-3
• Problems with Ports, page 9-3
• Port Troubleshooting Commands, page 9-9
Information About Ports
This section includes the following topics:
• Information About Interface Characteristics, page 9-1
• Information About Interface Counters, page 9-2
• Information About Link Flapping, page 9-2
• Information About Port Security, page 9-2
Information About Interface Characteristics
Before a switch can relay frames from one data link to another, you must define the characteristics of
the interfaces through which the frames are received and sent. The configured interfaces can be Ethernet
(physical) interfaces, virtual Ethernet interfaces, and the management interface.
Each interface has the following:
• Administrative Configuration
The administrative configuration does not change unless you modify it. This configuration has
attributes that you can configure in administrative mode.
• Operational state
The operational state of a specified attribute, such as the interface speed. This state cannot be
changed and is read-only. Some values might not be valid when the interface is down (such as the
operation speed).
For a complete description of port modes, administrative states, and operational states, see the Cisco
Nexus 1000V Interface Configuration Guide.
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