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1.网络基本结构该市EPON网络直接承载于城域互联网上。通过互联网接入软交换网络,其典型的基本网络结构见图一:该市城域互联网采用路由交换混合组网模式建网,于2002年建设完成,分为核心层、汇聚层和接入层。城域骨干路由器属于核心层,BASE(宽带接入服务器)属于汇聚层,汇聚交换机以下的交换网络属于接入层,用于为公众和专线用户提供互联网服务。为适应
1. The basic network structure The city’s EPON network directly hosted on the city’s Internet. Access to the softswitch network through the Internet, the typical basic network structure shown in Figure 1: The city’s metro network using routing and switching hybrid networking mode built in 2002, completed construction, is divided into the core layer, the convergence layer and access layer . The backbone router in the metro area belongs to the core layer. The BASE (broadband access server) belongs to the aggregation layer. The switching network below the aggregation switch belongs to the access layer, which is used to provide Internet service for public and private line users. To adapt