networking routing ai_generated partial

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

OSPF: LSDB overload detected, max LSA limit (10000) reached on area 0.0.0.0, dropping new LSAs

ID: networking/ospf-lsdb-overload

其他格式: JSON · Markdown 中文 · English
88%修复率
86%置信度
1证据数
2024-06-12首次发现

版本兼容性

版本状态引入弃用备注
Cisco IOS 15.9(3)M active — — —
Juniper Junos 22.2R2 active — — —
FRRouting 8.4 active — — —

根因分析

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。

English

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.

generic

官方文档

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html

解决方案

  1. 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.
  2. Configure OSPF stub area or totally stubby area on the affected area to reduce LSA flooding: area 0.0.0.0 stub no-summary
  3. 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.

无效尝试

常见但无效的做法:

  1. 80% 失败

    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.

  2. 85% 失败

    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.

  3. 90% 失败

    This causes a complete network outage and does not address the LSA source; the overload will return once OSPF is re-enabled.