# LACP

在IEEE标准中，链路聚合控制协议（Link Aggregation Control Protocol, LACP）提供了一种控制多个物理接口聚合成一个单一逻辑通道的方式。LACP通过发送LACP数据包给对端（直接连接的设备也实现LACP）允许网络设备协商出一个自动聚合的链路。

LACP功能和案例：

* 端口通道允许的最大聚合端口数：数值通常是1到8。一些设备的取值范围是1到4。（如Cisco 10000系列路由器）
* LACP数据包是在多播组MAC地址`01:80:c2:00:00:02`（`01-80-c2-00-00-02`）上发送
* 在LACP检测时：
  * LACP数据包每秒发送一次
  * 对于链路成员保持存活到机制（默认：慢速=30s，快速=1s）
* LACP可以具有端口负载均衡模式：
  * 链路(`link-id`)整数是在负载均衡中标记链路成员所使用的，取值范围是1到8
* LACP模式：
  * 主动端口：必须无条件激活LACP
  * 被动端口：在监测到LACP设备时必须激活LACP(这是默认状态)


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