宽带城域网的结构

1.宽带城域网的逻辑结构。

完整的宽带城域网主要包括网络平台，业务平台，管理平台3个平台与城市带宽一个出口。

平台	包含
管理平台	业务管理系统，网络管理系统
业务平台	Voice,Video,IP data,IDC,VPN
网络平台	核心层，汇聚层，接入层
城市带宽出口	国家主干网连接

2.宽带城域网网络平台各层的主要功能

1. 核心交换层的基本功能：

核心交换层将多个汇聚层连接起来，为汇聚层的网络提供高速转发，为整个城域网提供一个高速，安全具有Qos保障能力的数据传输环境；
核心交换层实现与主干网络的互联，提供城市的带宽IP数据出口；
核心交换层提供宽带城域网的用户访问Internet所需要的路由服务；

2. 汇聚层的基本功能

汇聚接入层的用户流量，进行数据分组传输的汇聚，转发与交换；
根据汇聚层接入层的用户流量，进行本地路由，过滤，流量均衡，Qos优先级管理，以及安全控制，IP地址转换，流量整形等处理；
根据处理结果把用户流量转发到核心交换层或本地进行路由处理。

3.接入层的基本功能

接入层解决的是“最后一公里”问题。通过各种接入技术，连接最终用户，为它所覆盖范围内的用户提供访问Internet以及其他的信息服务。

总结：

宽带城域网采用三层结构思想：上层负责下层的数据汇聚；核心层提供出口与Qos，汇聚本地路由，接入服务用户。

易错提示：

差异化记忆

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核心交换层

汇聚层

接入层

宽带城域网网络平台的核心层主要承担高速数据交换功能，汇聚层主要承担路由与流量汇聚的功能，接入层主要承担用户接入与本地流量控制的功能。

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