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LAB:Configuring vPC & its Components

Topology:

Task:

Configure the vPC system as per topology and as per task given below.

Configure vPC domain 100 between N7K1 and N7K2
Configure N7K1 with Role priority 10 and N7K2 with Role Priority 20
Configure Peer-keepalive link between N7k1 and n7K2 on mgmt0 link.
Configure LACP port-channel port Eth1/1 and Eth1/2 on both N7K1 and N7K2 and use it as peer-link
Configure Eth1/3 on vPC 10 and Eth1/4 on vPC 20 on N7K1 and same on N7K2.
Configure Eth1/3 and Eth1/4 on N5K1 on Port channel 10 and Eth1/3 and Eth1/4 on N5K2 on Port channel 20.
Configure Layer 2 VLAN VLAN 10, VLAN 20, and VLAN 30 on All Four Switch
Configure N7K1 as STP Root Bridge.
Configure Eth1/5 on VLAN 10 on Both N5K1 and N5K2. Assign HOST 1 with IP 10.10.10.4 and Host with IP 10.10.10.5
Verify the Connectivity vPC and Connectivity between Host 1 and Host 2.

Solution:

TASK 1: Configure vPC domain 100 between N7K1 and N7K2, Configure N7K1 with Role priority 10 and N7K2 with Role Priority 20 and Configure Peer-keepalive link between N7k1 and n7K2 on mgmt0 link. Configure LACP port-channel port Eth1/1 and Eth1/2 on both N7K1 and N7K2 and use it as peer-link

NEXUS 7K1 Configuration:
N7K1(config)# feature lacp
N7K1(config)# feature vpc
N7K1(config)# feature interface-vlan
N7K1(config)# vpc domain 100
N7K1(config-vpc-domain)# role priority 10
N7K1(config-vpc-domain)# peer-keepalive destination 192.168.1.2 source 192.168.1.1 vrf management
N7K1(config-vpc-domain)# exit
!
N7K1(config)# int eth1/1-2
N7K1(config-if-range)# switchport
N7K1(config-if-range)# switchport mode trunk
N7K1(config-if-range)# channel-group 100 mode active
N7K1(config-if-range)# no shut
N7K1(config-if-range)# exit
N7K1(config)# int po100
N7K1(config-if)# switchport
N7K1(config-if)# switchport mode trunk
N7K1(config-if)# vpc peer-link
N7K1(config-if)# no shut
N7K1(config-if)#exit
!
NEXUS 7K2 Configuration:
N7K2(config)# feature lacp
N7K2(config)# feature vpc
N7K2(config)# feature interface-vlan
N7K2(config)# vpc domain 100
N7K2(config-vpc-domain)# role priority 20
N7K2(config-vpc-domain)# peer-keepalive destination 192.168.1.1 source 192.168.1.2 vrf management
N7K2(config-vpc-domain)# exit
!
N7K2(config)# int eth1/1-2
N7K2(config-if-range)# switchport
N7K2(config-if-range)# switchport mode trunk
N7K2(config-if-range)# channel-group 100 mode active
N7K2(config-if-range)# no shut
N7K2(config-if-range)# exit
N7K2(config)# int po100
N7K2(config-if)# switchport
N7K2(config-if)# switchport mode trunk
N7K2(config-if)# vpc peer-link
N7K2(config-if)#exit
N7K2(config-if)# no shut

vPC domain Verification and Peer-link verification:

GENERAL FAQ

What is the purpose of this Cisco vPC configuration lab?

This Cisco vPC lab is designed to help you build and verify a functional virtual Port Channel (vPC) environment using two Nexus 7K switches. In this exercise, you configure the vPC domain, peer-link, peer-keepalive link, LACP port-channels, VLANs, STP root bridge, and verify host connectivity. The lab demonstrates how vPC provides link redundancy and loop-free Layer 2 forwarding.

Why is the vPC peer-keepalive link important in vPC configuration?

The vPC peer-keepalive link is used to monitor the health of the vPC peer switches. It typically runs over the management interface (mgmt0) and helps detect peer failures. Its primary purpose is to prevent split-brain scenarios, where both switches mistakenly believe they are the primary device. The peer-keepalive link carries only control messages and does not forward data traffic.

What is the role of the vPC peer-link in Cisco vPC configuration?

The vPC peer-link is the primary connection between the two vPC peer switches. It synchronizes MAC address tables, VLAN information, ARP entries, and control-plane states between the Nexus switches. In this lab, the peer-link is configured using an LACP port-channel in trunk mode, allowing multiple VLANs to pass between the switches.

Why are role priorities configured in a vPC domain?

Role priority determines which switch becomes the vPC primary device. The switch with the lower role priority value becomes primary. In this lab, N7K1 is configured with priority 10 and becomes the primary switch, while N7K2 with priority 20 becomes secondary. This ensures predictable behavior during failure and recovery scenarios.

What should be verified after completing the Cisco vPC lab configuration?

After completing the configuration, verify the following:

vPC domain status

Peer-link status

Port-channel and VLAN consistency

STP root bridge status

Host-to-host connectivity

Successful verification confirms that vPC redundancy and loop-free forwarding are working correctly.

Where can I learn more advanced Cisco vPC lab scenarios?

This lab covers the fundamentals of vPC configuration. However, real-world environments also involve failure testing, consistency checks, orphan ports, and troubleshooting scenarios. For comprehensive hands-on training, step-by-step demonstrations, and exam-oriented real-world scenarios, you can enroll in the complete course. Membership plans are available as Monthly ($100), Half-Yearly ($200), and Annual ($350).

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LAB:Configuring vPC & its Components