feat(mac-locations): VLAN-aware port MAC counts, access/trunk thresholds, likely_attachment

Made-with: Cursor

internal/scans/portfdb.go

@@ -0,0 +1,33 @@
+package scans
+
+import "strconv"
+
+// PortFDBLocationKey — ключ «где в FDB»: IP коммутатора, порт и VLAN (Q-BRIDGE).
+func PortFDBLocationKey(ip string, ifIndex, bridgePort, vlan int) string {
+	return ip + "|" + strconv.Itoa(ifIndex) + "|" + strconv.Itoa(bridgePort) + "|" + strconv.Itoa(vlan)
+}
+
+// ClassifyPortKind по числу уникальных MAC на порту и порогам (ожидается accessMax < trunkMin).
+func ClassifyPortKind(macsOnPort, accessMax, trunkMin int) string {
+	if macsOnPort <= accessMax {
+		return "access"
+	}
+	if macsOnPort >= trunkMin {
+		return "strong_transit"
+	}
+	return "ambiguous"
+}
+
+// PortKindRank для сортировки: access → ambiguous → strong_transit.
+func PortKindRank(kind string) int {
+	switch kind {
+	case "access":
+		return 0
+	case "ambiguous":
+		return 1
+	case "strong_transit":
+		return 2
+	default:
+		return 9
+	}
+}