Unit 7: Bonds (LAG) | Cumulus | NCP-AIN | Training

Objective

Build high-bandwidth resilient link aggregation using LACP and controlled hashing policies.

Concept Notes

LAG policies directly influence throughput symmetry and fault tolerance. For exam scenarios, always connect LACP state, member health, and hashing behavior to the observed performance outcome.

When utilization is uneven, avoid guessing. Validate bond policy, member parity, and traffic characteristics before changing hash settings or physical topology.

Coverage Checklist

LACP dynamic aggregation vs static balance-xor.
Bond and member lifecycle and naming conventions.
LACP rate and bypass behavior.
Hash-policy implications for flow-level distribution.
Operational health validation for members and aggregate links.

Practice Outcomes

Prefer LACP unless forced into static interop cases.
Use explicit hash validation when investigating uneven flow spread.
Verify member parity before declaring a bond healthy.

Command Drills

nv set interface bond56 bond member swp5-6 && nv config apply

Create and apply an aggregated link group.

nv show interface bond56 bond

Inspect operational member and LACP state.

nv set interface bond1 bond lacp-rate fast

Tighten control-plane responsiveness for bond negotiation.

Navigation

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