Troubleshooting Virtual Port Channel Issues; Improper Configurations - Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual

S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .

Troubleshooting Virtual Port Channel Issues

A virtual port channel (vPC) allows links that are physically connected to two different Cisco Nexus
5000 Series switches to appear as a single port channel to a third device. The third device can be a switch,
server, or any other networking device. A vPC can provide Layer 2 multipathing, which allows you to
create redundancy by increasing bandwidth, enabling multiple parallel paths between nodes and
load-balancing traffic where alternative paths exist.
This chapter describes how to identify and resolve problems that can occur with vPC in the Cisco Nexus
5000 Series switch.
This chapter includes the following section:
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Improper Configurations

vPC fails to start
This issue may have many possible causes:
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Unable to configure vPC
Possible Cause
vPC is not enabled or is not supported in the NX-OS release of software that you are running.
Solution
Ensure that the NX-OS release supports vPC. vPC is supported in NX-OS Release 4.1 and later releases.
If the NX-OS release supports vPC, then use the command feature of vPC to enable it.
OL-25300-01
Improper Configurations
Unable to configure vPC
vPC in blocking state
vPC domain ids
Connectivity issues
Peer-link issues
vPC Consistency parameter issues
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C H A P T E R
Cisco Nexus 5000 Series Troubleshooting Guide
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