根据集团公司“交换防瘫痪、传输防阻断、数据防拥塞”的要求，IP 城域网在运行过

程中就需要经常注意节点出口带宽的使用情况，由于今年来，计算机的普及，上网人数呈现

几何级的增长，互联网病毒也越来越多，爆发的频率也越来越高，许多蠕虫病毒在爆发时具

有扫描网络，主动传播病毒的能力，会大量占用网络带宽或网络设备系统资源。在很短的时

间内，大量的异常流量会淹没正常的流量，非正常的数据流量攻击网络设备或其接入的服务

器，致使网络设备或服务器的性能下降，或占用网络带宽，影响其它相关用户流量的正常通

信，最终使被攻击目标因过载而崩溃-According to the company, "anti-paralysis of the exchange, transfer anti-blocking, anti-congestion data" requirements, IP MAN run over

Process requires constant attention to the export node bandwidth usage, because this year, the popularity of computers, the Internet showing the number of

Geometric growth of the Internet more and more viruses, increasing the frequency of outbreaks, many of the outbreak of a worm

There scan the network, the ability to take the initiative to spread the virus will take a lot of network bandwidth or network equipment system resources. In a very short time

Room, a large number of abnormal traffic flow will take away the normal, non-normal data traffic attacks or access the services network equipment

Device, resulting in the performance of network devices or server down, or network bandwidth, affecting the normal flow of other relevant users through

Letter, and finally to be targeted collapse due to overload