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Ask the Expert: Different Flavors and Design with vPC on Cisco Nexus 5000 Series Switches

Community Manager

Welcome to the Cisco® Support Community Ask the Expert conversation.  This is an opportunity to learn and ask questions about Cisco® NX-OS. 

The biggest limitation to a classic port channel communication is that the port channel operates only between two devices. To overcome this limitation, Cisco NX-OS has a technology called virtual port channel (vPC). A pair of switches acting as a vPC peer endpoint looks like a single logical entity to port channel attached devices. The two devices that act as the logical port channel endpoint are actually two separate devices. This setup has the benefits of hardware redundancy combined with the benefits offered by a port channel, for example, loop management.

vPC technology is the main factor for success of Cisco Nexus® data center switches such as the Cisco Nexus 5000 Series, Nexus 7000 Series, and Nexus 2000 Series Switches.

This event is focused on discussing all possible types of vPC along-with best practices, failure scenarios, Cisco Technical Assistance Center (TAC) recommendations and troubleshooting

Cisco Experts

Vishal Mehta is a customer support engineer for the Cisco Data Center Server Virtualization Technical Assistance Center (TAC) team based in San Jose, California. He has been working in TAC for the past 3 years with a primary focus on data center technologies, such as the Cisco Nexus 5000 Series Switches, Cisco Unified Computing System™ (Cisco UCS®), Cisco Nexus 1000V Switch, and virtualization. He presented at Cisco Live in Orlando 2013 and will present at Cisco Live Milan 2014 (BRKCOM-3003, BRKDCT-3444, and LABDCT-2333). He holds a master’s degree from Rutgers University in electrical and computer engineering and has CCIE® certification (number 37139) in routing and switching, and service provider.

Nimit Pathak is a customer support engineer for the Cisco Data Center Server Virtualization TAC team based in San Jose, California, with primary focus on data center technologies, such as Cisco UCS, the Cisco Nexus 1000v Switch, and virtualization. Nimit holds a master's degree in electrical engineering from Bridgeport University, has CCNA® and CCNP® Nimit is also working on a Cisco data center CCIE® certification While also pursuing an MBA degree from Santa Clara University.

Remember to use the rating system to let Vishal and Nimit know if you have received an adequate response. 

Because of the volume expected during this event, Vishal and Nimit might not be able to answer every question. Remember that you can continue the conversation in the Network Infrastructure Community, under the subcommunity LAN, Switching & Routing, shortly after the event. This event lasts through August 29, 2014. Visit this forum often to view responses to your questions and the questions of other Cisco Support Community members.

1 Comment

I have A DUAL HOME 5k to 2Ks , and would like to configure server ports 8 ports from each 2k.


int ethernet 100/1/1 - 8

int ethernet 101/1/1-8  


all 8 ports from each 2k switches are connected to the same switch.


would the following configuration work? on switch 1 and 2.

CiscoNexus-1(config-if)# interface ethernet 100/1/1-8
CiscoNexus-1(config-if)# switchport mode trunk
CiscoNexus-1(config-if)# switchport trunk native vlan 100
CiscoNexus-1(config-if)# switchport trunk allowed vlan 100-105
CiscoNexus-1(config-if)# channel-group 128
CiscoNexus-1(config-if)# no shutdown
CiscoNexus-1(config-if)# exit
CiscoNexus-1(config)# interface port-channel 128
CiscoNexus-1(config-if)# vpc 128
CiscoNexus-1(config-if)# no shutdown
CiscoNexus-1(config-if)# exit