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evo-azure-bgp-oscillation-route-leak

Analyzes Azure Virtual WAN multi-hub BGP topologies to detect route oscillation (preference cycles) and valley-free route leak violations (Gao-Rexford model), then evaluates proposed solutions against domain-specific resolution criteria.

tasks-evolved/azure-bgp-oscillation-route-leak/environment/skills/evo-azure-bgp-oscillation-route-leak/SKILL.md

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# BGP Route Oscillation and Route Leak Analyzer for Azure Virtual WAN

Detects BGP route oscillation and valley-free route leak violations in Azure Virtual WAN multi-hub topologies, then evaluates whether proposed solutions resolve each issue.

## Domain Knowledge

### Oscillation Detection (Preference Cycle)
A BGP oscillation occurs when ASes form a mutual routing preference cycle: e.g., AS A prefers routes via AS B, while AS B prefers routes via AS A. The preference graph is a directed functional graph (out-degree ≤ 1 per node). A cycle of any length causes persistent non-convergence. Detection uses DFS-based traversal with path tracking.

**Output**: `oscillation_cycle` and `affected_ases` are deterministically ordered (rotated so the smallest ASN appears first).

### Route Leak Detection (Gao-Rexford Valley-Free Model)
Under the Gao-Rexford valley-free routing principle (RFC 7908):
- **Customer-learned** routes → may export to anyone (customers, peers, providers)