在指定时间内对传入端口2022连接的数量限速。
Rate-limit the number of incoming port 2022 connections within a specified time.
这可用于防止试图破坏DHCP绑定数据库的攻击，并对进入交换机端口的DHCP流量限速。
This can be used to prevent attacks that attempt to poison the DHCP binding database, and to rate-limit the amount of DHCP traffic that enters a switch port.
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