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Cisco Nexus 5000 Series NX-OS Interfaces Operations Guide, Release 5.0(3)N2(1)
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Virtual Port Channel Operations
This chapter describes the best practices and operational procedures for the virtual port channel (vPC)
feature on Cisco Nexus 5000 Series switches that run Cisco NX-OS Release 5.0(2)N2(1) and earlier
releases.
This chapter includes the following sections:
• Information About vPC Operations, page 1-1
• vPC Consistency Checks, page 1-1
• Configuring Changes in vPC Topologies, page 1-9
• Replacing a Cisco Nexus 5000 Series Switch or Cisco Nexus 2000 Fabric Extender, page 1-10
• vPC Failure Recovery, page 1-14
• Tracing Traffic Flow in a vPC Topology, page 1-18
Information About vPC Operations
A 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 switch. The third switch can be a Cisco Nexus 2000 Series
Fabric Extender or a switch, server, or any other networking device. A vPC can provide Layer 2
multipath capability which allows you to create redundancy by increasing bandwidth, enabling multiple
parallel paths between nodes, and load-balancing traffic where alternative paths exist.
For a quick overview of vPC configurations, see the Virtual PortChannel Quick Configuration Guide at
the following URL:
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/configuration_guide_c07-54356
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vPC Consistency Checks
This section includes the following topics:
• Type 1 and Type 2 Consistency Check Parameters, page 1-2
• Graceful Consistency Check, page 1-3
• Configuring Per-VLAN Consistency Checks, page 1-5
• Identifying Inconsistent vPC Configurations, page 1-6
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