CloudLabBox
Try the free demo

CCNP ENCOR lab 4 of 36

Troubleshoot EtherChannel

Four bundles from lab 3 are each broken in a different, realistic way: a negotiation deadlock, a suspended member, a static-versus-LACP mismatch with the misconfiguration guard, and a layer 2 port in a layer 3 bundle. Find and fix them all.

Run this lab

It needs Lite: its 5 nodes are set to 5 vCPU and 4,352 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 04 - Troubleshoot EtherChannel

Try it free for 30 minutesRun it on Lite from £3 a day

The free demo needs no card and no email. Every lab plan includes every guided lab.

Level
Advanced
Time
About 60 minutes
Nodes need
5 vCPU, 4,352 MB
Smallest plan
Lite

The scenario

Fernhill Freight's monitoring shows the warehouse uplinks running at half capacity, a "channel-misconfig" alarm on ASW1, and a routed link between the distribution switches that has lost a member. The bundles were built from the design in lab 3, then "tidied up" by a colleague who has since gone on leave. Restore every bundle to the design:

BundleMembersMethodSettings
Po1DSW1 Gi0/0–0/1 ↔ DSW2 Gi0/0–0/1LACP, DSW1 active, DSW2 passiveL2 trunk, native 999, allowed 10,20,99
Po2DSW1 Gi0/2–0/3 ↔ ASW1 Gi0/0–0/1PAgP, DSW1 desirable, ASW1 autosame
Po3DSW2 Gi0/2–0/3 ↔ ASW1 Gi0/2–0/3static on at both endssame
Po10DSW1 Gi1/0–1/1 ↔ DSW2 Gi1/0–1/1LACP active at both endsrouted, 10.0.12.1/30 and .2/30, OSPF

DSW1 is the root bridge and the PCs' gateway (Vlan10 10.10.10.2, Vlan20 10.10.20.2).

Topology: as in lab 3. DSW1 and DSW2 joined by four cables; ASW1 has two cables to each distribution switch; PC1 and PC2 hang off ASW1.

What you’ll practise

  • Read show etherchannel summary flags and know what each one means for the fault
  • Recognise negotiation mode mismatches for LACP, PAgP and static bundles
  • Find member configuration mismatches that suspend a port
  • Recover a bundle err-disabled by the EtherChannel misconfiguration guard
  • Fix a layer 2 member in a layer 3 port channel

The tasks

  1. Read the flags
  2. Po1 never forms
  3. Po2 has a suspended member
  4. Po3: the channel-misconfig alarm
  5. Po10 has only one member on DSW2
  6. Prove the block is healthy

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of Troubleshoot EtherChannel5 nodes, 10 links. Every link is listed as text below the diagram.DSW1DSW2ASW1PC1PC2Gi1/0eth0Gi1/1eth0Gi0/2Gi0/0Gi0/3Gi0/1Gi0/2Gi0/2Gi0/3Gi0/3Gi0/0Gi0/0Gi0/1Gi0/1Gi1/0Gi1/0Gi1/1Gi1/1
5 nodes, with the interface names each link uses.
Every link, as text
  • DSW1 Gi0/0 to DSW2 Gi0/0
  • DSW1 Gi0/1 to DSW2 Gi0/1
  • DSW1 Gi1/0 to DSW2 Gi1/0
  • DSW1 Gi1/1 to DSW2 Gi1/1
  • DSW1 Gi0/2 to ASW1 Gi0/0
  • DSW1 Gi0/3 to ASW1 Gi0/1
  • DSW2 Gi0/2 to ASW1 Gi0/2
  • DSW2 Gi0/3 to ASW1 Gi0/3
  • ASW1 Gi1/0 to PC1 eth0
  • ASW1 Gi1/1 to PC2 eth0
Nodes in Troubleshoot EtherChannel, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
DSW1Cisco IOSvL2viosl2-adventerprisek9-m.ssa.high_iron_202009291 vCPU, 768 MB
DSW2Cisco IOSvL2viosl2-adventerprisek9-m.ssa.high_iron_202009291 vCPU, 768 MB
ASW1Cisco IOSvL2viosl2-adventerprisek9-m.ssa.high_iron_202009291 vCPU, 768 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder CCNP ENCOR 350-401 guided labs.

  3. Open 04 - Troubleshoot EtherChannel and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

More CCNP ENCOR labs

All CCNP ENCOR labs

Related labs in other courses

CloudLabBox is independent of Cisco. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.