红帽全球峰会8.341. ttl
TimeToLive、或 ttl 属性包含缓存条目信息应被视为有效的时间（以秒为单位）。过了指定时间后，信息将被视为过期。值为零(0)表示不应缓存该条目。
TimeToLive: 120 ttl: 120
TimeToLive: 120
ttl: 120| OID | 1.3.6.1.4.250.1.60 |
| 语法 | DirectoryString |
| 多或单值 | 多值 |
| 定义于 | LDAP 缓存互联网优化 |
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