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Sunday 12 November 2017

cisco nexus vpc configuration best practice

Virtual port channel step by step


Quick Introduction

Virtual port channel (vPC) allows links which are physically connected with each other and behave like a one link to third device (it may be switch,server,pc etc).

vpc diagram and topology diagram

vPC feature only available in cisco NX-OS only. In above figure both nexus switches connected with each other through vPC and connected with third device which is 2960 network switch. Suppose vPC configuration done then both nexus behave like a one switch (bundle) to 2960 switch. This is a quick guide to configure a vPC. Below is the link for details of VPC and its features, benefits.


Quick vPC Configurations steps


vpc peer-link diagram example
AQ Learning Center vPC Diagram


We are going to configure quick step of vPc and consider the above diagram for reference
  • Enable vPC Feature on Both Nexus

enable vpc feature in cisco nexus 7k 5 k

  • Management VRF Context For Keepalive Update on Both Nexus

Management VRF Context For Keepalive Update on Both Nexus

  • Configure Both Nexus Management Interface (For telnet, SSH, Keepalive)


Management VRF Context For Keepalive Update on Both Nexus
AQ-Learning-Center-Nexus-1

Management VRF Context For Keepalive Update on Both Nexus
AQ-Learning-Center-Nexus-2

  • Configure IP Route On Both Nexus

cisco ip route command

  • Configure vPC Domain ID on Both Nexus (Same ID)

vpc domain

  • Configure Role Priority on Both Nexus

Note that role priority should be configured in (config-vpc-domain) after creating domain ID. Role Priority should be different on both nexus. Primary nexus Priority should be less than secondary

Configure Role Priority nexus
AQ-Learning-Center-Nexus-1

Configure Role Priority nexus
AQ-Learning-Center-Nexus-2


  • Configure IP of Source and Destination Keepalive


Now configure the source (Nexus1) and Destination (Nexus2) keepalive ip address

Configure IP of Source and Destination Keepalive
AQ-Learning-Center-Nexus-1

cisco nexus Configure IP of Source and Destination Keepalive
AQ-Learning-Center-Nexus-2

  • Configure Port-Channel 2 on Nexus-1

Apply these command in configuration mode


(Config)#interface port-channel2
 (Config-if)# no switchport
  vrf member Keepalive
  ip address 172.15.13.1/24

  • Configure Port-Channel 2 on Nexus-2

Apply these command in configuration mode

Config)#interface port-channel2
 (Config-if)# no switchport
  vrf member Keepalive
  ip address 172.15.13.2/24
  • Now Apply Port channel to Physical Ports on Nexus-1

Apply these commands in Configuration mode

interface Ethernet3/1
no switchport
description ****Connected To AQ-Learning-Nexus-2-VPC Peer-Keepalive-Link-172.15.13.2****
channel-group 2 mode active
no shutdown

interface Ethernet3/2
no switchport
description ****Connected To AQ-Learning-Nexus-2-VPC Peer-Keepalive-Link-172.15.13.2****
channel-group 2 mode active
no shutdown

  • Now Apply Port channel to Physical Ports on Nexus 2

interface Ethernet3/1
no switchport
description ****Connected To AQ-Learning-Nexus-1-VPC Peer-Keepalive-Link-172.15.13.1****
channel-group 2 mode active
no shutdown

interface Ethernet3/2
no switchport
description ****Connected To AQ-Learning-Nexus-2-VPC Peer-Keepalive-Link-172.15.13.1****
channel-group 2 mode active
no shutdown

After connected cables to your both Nexus the peer status is (peer adjacency formed ok) and keep alive link is alive as under

show vpc comand details

cisco nexus Configure IP of Source and Destination Keepalive





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Hope document helpful for you

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