EtherChannel Troubleshooting Capstone (L2 LACP)

Bundle lab · $29.99

Advanced CCNP EtherChannel troubleshooting capstone on Cisco IOS L2 switches. Two ioll2-xe switches are joined by two parallel links intended to bundle as one LACP Port-channel. The lab ships pre-broken with two independent faults on SW1: the parallel links are placed into different channel-groups and their switchport L2 parameters are inconsistent. Learners must use show commands to diagnose, then correct both faults so Port-channel 100 bundles both members as an access link for VLAN 100, restoring host-to-host reachability.

Learning objectives

• Diagnose EtherChannel bundling failures using show etherchannel summary and show etherchannel detail.
• Identify and correct local channel-group inconsistency across member links.
• Standardize Layer-2 parameters on member interfaces and the Port-channel to ensure compatibility.
• Implement deterministic LACP (mode active) bundling for a two-link access EtherChannel.
• Verify restoration with host-to-host connectivity and Port-channel operational state.

Troubleshooting focus

• If a Port-channel remains down or members show suspended/individual, compare the channel-group number per member on the SAME device to ensure they join the same aggregator.
• Confirm both ends are using compatible EtherChannel modes: on/on (static), active/active or active/passive (LACP), desirable/desirable or desirable/auto (PAgP).
• Validate that each member’s switchport parameters are identical on its local device (mode access or trunk, VLAN or allowed list, speed/duplex) so the bundle can form.
• Check that the logical Port-channel interface has the intended Layer-2 settings and that the members inherit the same parameters.
• Use show etherchannel summary and show etherchannel 100 detail to correlate state flags, partner information, and reasons a member is not bundled.