The link bundle won't come up
Two links between switches should be one LACP port-channel, but a config mismatch keeps it down. Fix it so the bundle forms.
Scenario
Two switches, sw1 and sw2, are cabled together with two links that are supposed to bond into a single LACP port-channel for bandwidth and redundancy. But the bundle is down: the two sides don't agree, so the links aren't bundling.
Topology
- sw1 ↔ sw2 with two links (Ethernet1 and Ethernet2 on each), meant to be Port-Channel1 via LACP.
Your job
Fix the configuration so both links bundle into Port-Channel1 and LACP negotiates with the neighbor.
What "done" looks like
show port-channel 1 shows Po1 up with both members bundled, and LACP has a neighbor on each link.
Teaches: link aggregation with LACP: both ends must use the same channel-group and an LACP mode that actually negotiates (active/passive, not one side static "on").
Tooling
Arista cEOS. Validate syntax on first deploy.
What gets checked
Your solution is verified against each of these:
- Port-Channel1 is up with both physical links bundled
- LACP is negotiated with the neighbor on both member links
Solve it in your browser
No setup, no install. Write your solution in the editor and hit Check. The in-house engine renders and grades it instantly, then issues your proof the moment every check passes.
Solve in browser →Prefer your own lab?
- Build the fix locally. New to the tooling? See setting up your lab.
- Push your topology file, device configs, and any playbooks to a public repo (GitHub or GitLab).
- Submit the repo link. We review it by hand, confirm it works, and issue your proof page.