CCNA lab 19
Troubleshooting: an EtherChannel that will not come up
Two switches should share an LACP port-channel trunk for VLANs 10 and 20, but users cannot reach each other. Find the bundling and trunk faults and fix them.
About 25 minutes 6 devices 3 tasksAdvanced
Scenario
After a change window, SW1 and SW2 should be joined by Port-channel 1 (LACP, Gi0/1 and Gi0/2) carrying VLANs 10 and 20 as a trunk. PCs in the same VLAN on different switches can no longer reach each other. Use `show etherchannel summary`, `show interfaces trunk`, `show spanning-tree` and the running configs to find every fault.
Your tasks
- Port-channel 1 forms with LACP and both member links on both switches.
- PC1 can ping PC3 (VLAN 10).
- PC2 can ping PC4 (VLAN 20).
The lab checks the result, not the exact commands. For example, a ping task passes only when the ping really succeeds through the network you built.