A township sees unequal ECMP utilization because underlay metrics w…

Question

A township sees unequal ECMP utilization because underlay metrics were set inconsistently across leaf-spine paths. What does that symptom highlight?

Accepted Answer

Fabric ECMP depends on equal-cost underlay paths; mismatched metrics prevent equal multipath membership — ECMP is picky—it only load-shares paths that cost the same. Skew the metrics and some spine links become wallflowers while others sweat. Fix the costs if you want the Clos to share fairly.

Answer

ECMP in fabrics ignores metrics and always sprays round-robin regardless of cost

Answer

Unequal metrics prove the design must fall back to STP for multipath

Answer

BGP cannot ECMP on Junos, so metric tuning is irrelevant

A township sees unequal ECMP utilization because underlay metrics were set inconsistently across leaf-spine paths. What does that symptom highlight?

Short Explanation

Full Explanation