AvailabilitySign inBook a DemoJoin Waitlist
Back to Learning
CCNP · DCINX9KBeginner

Nexus 9000 NX-OS Switching

One switch is forwarding, the other suspended its vPCs. Find the parameter the peers disagree on, live, right below.

Interactive simData CenterSwitchingNX-OS

Symptom

vPC domains, peer-links and standalone NX-OS switching on real Nexus 9000 gear, not the ACI-mode UI.

Your mission

Inspect, recover, then verify

Format

NX-OS CLI

Start interactive labSee the investigation plan ↓Need a hint? Reveal the root cause ↓
NX-OS: The vPC That Suspended Itself

Investigate before you configure.

Use the CLI evidence to isolate the fault, make the smallest safe correction, then verify the network state changed.

Observe the symptom and link state.

Diagnose by comparing the protocol evidence.

Verify the expected device state and confirm the original symptom is resolved.

Console access: Nexus 9000

This workspace stacks for portrait phones. Rotate to landscape for the full split-screen console.

Need a hint?

Reveal the root cause when you're ready.

Try the investigation first, then use this as your escape hatch, not a dead end.

Locked

Sign up with your email to open Nexus 9000 NX-OS Switching, free. You get the root cause and the full step-by-step fix.

No spam. The fix lands in your inbox too. Signing up includes 4 guided labs free, tracked against your email. After that, the Learning Pass unlocks every remaining lab.

Lab debrief

Turn the session into a repeatable troubleshooting pattern.

Use this reference after your attempt: first explain the symptom, then verify the evidence, then confirm the repair.

The problem

A vPC pair that was working fine suddenly shows one switch's ports suspended, and downstream devices connected through it start losing connectivity.

What you'll practice

  • Configure a vPC domain between two Nexus 9000 switches
  • Set up peer-link and peer-keepalive connectivity
  • Verify vPC consistency checks and role election
  • Configure port-channels toward downstream and upstream devices
  • Diagnose a vPC in a suspended or inconsistent state

The topology

Two Nexus 9000 switches form a vPC domain over a dedicated peer-link, each connecting downstream to a shared access switch, the standard vPC dual-homing topology used in production data-center access layers.

Commands to run yourself

The real diagnostic commands for this lab, copy-paste ready. Run these in the same order to reproduce the investigation on your own session.

vPC status overview
show vpc brief
Global consistency parameters
show vpc consistency-parameters global
Peer-link trunk state
show interface port-channel1 trunk

Topology diagram

Fact-checked references

The commands and behaviour in this lab were checked against these primary references.

Frequently asked

Is this NX-OS standalone mode or ACI mode?

Standalone NX-OS: the CLI-driven mode most CCNP DCINX9K and day-to-day data-center switching work uses, distinct from the ACI fabric labs.

What runs in the browser, and how does it differ from a live lab?

This page uses a focused browser simulation with modeled commands and device state. It is not a full device operating system. Dedicated virtual lab sessions are a separate product; check the available topology and booking details before purchasing live time.

Ready to run this lab yourself?

No setup, no image sourcing. Book a session or ask for a live demo.

View availabilityBook a demo