{
  "id": "networking/ospf-lsdb-overload",
  "signature": "OSPF: LSDB overload detected, max LSA limit (10000) reached on area 0.0.0.0, dropping new LSAs",
  "signature_zh": "OSPF: 检测到LSDB过载，区域0.0.0.0上达到最大LSA限制（10000），丢弃新的LSA",
  "regex": "OSPF: LSDB overload detected, max LSA limit \\(\\d+\\) reached on area \\d+\\.\\d+\\.\\d+\\.\\d+, dropping new LSAs",
  "domain": "networking",
  "category": "routing",
  "subcategory": null,
  "root_cause": "The OSPF Link State Database (LSDB) has exceeded the configured maximum number of Link State Advertisements (LSAs) due to route flapping or a misconfigured router injecting excessive routes, causing the router to drop new LSAs and potentially corrupt the routing table.",
  "root_cause_type": "generic",
  "root_cause_zh": "由于路由震荡或错误配置的路由器注入过多路由，OSPF链路状态数据库（LSDB）超过配置的最大链路状态通告（LSA）数量，导致路由器丢弃新的LSA并可能损坏路由表。",
  "versions": [
    {
      "version": "Cisco IOS 15.9(3)M",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Juniper Junos 22.2R2",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "FRRouting 8.4",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "This only masks the problem; if the LSA flood is due to a misconfiguration or attack, the LSDB will eventually exceed the new limit and cause memory exhaustion.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "The LSDB will be rebuilt from neighbors after reboot; if the underlying issue (e.g., route flapping) is not fixed, the overload will recur quickly.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "This causes a complete network outage and does not address the LSA source; the overload will return once OSPF is re-enabled.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Identify the source of excessive LSAs using 'show ip ospf database' and 'show ip route ospf' to find flapping routes, then configure route summarization or set a route filter to limit the number of redistributed routes.",
      "success_rate": 0.9,
      "how": "Identify the source of excessive LSAs using 'show ip ospf database' and 'show ip route ospf' to find flapping routes, then configure route summarization or set a route filter to limit the number of redistributed routes.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Configure OSPF stub area or totally stubby area on the affected area to reduce LSA flooding: area 0.0.0.0 stub no-summary",
      "success_rate": 0.85,
      "how": "Configure OSPF stub area or totally stubby area on the affected area to reduce LSA flooding: area 0.0.0.0 stub no-summary",
      "condition": "",
      "sources": []
    },
    {
      "action": "Temporarily increase the max LSA limit to 15000 while investigating: router ospf 1; max-lsa 15000; then set a timer to revert after 24 hours.",
      "success_rate": 0.75,
      "how": "Temporarily increase the max LSA limit to 15000 while investigating: router ospf 1; max-lsa 15000; then set a timer to revert after 24 hours.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Identify the source of excessive LSAs using 'show ip ospf database' and 'show ip route ospf' to find flapping routes, then configure route summarization or set a route filter to limit the number of redistributed routes.",
    "Configure OSPF stub area or totally stubby area on the affected area to reduce LSA flooding: area 0.0.0.0 stub no-summary",
    "Temporarily increase the max LSA limit to 15000 while investigating: router ospf 1; max-lsa 15000; then set a timer to revert after 24 hours."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.88,
  "resolvable": "partial",
  "first_seen": "2024-06-12",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}