Linyi broadcast television IP network construction step by step, that early in the no user case con- struction IP metropolitan area network BRAS, investment is wasteful serious, so we try to build in installment network approaches, a centralized deployment of two BRAS, all city to distinguish between front-end OLT di- rectly connected to BRAS equipment center. Make full use of BRAS equipment PON equipment layer two iso- lation, isolation, reducing the access layer to the two layer of network coverage, decreasing the number of VLAN reduces maintenance costs. Considering the large customer development uncertainty, for a period of not building the SR router, temporarily by BRAS instead of its function, it based on the above idea behind our BRAS, firewall other equipment ion considerations.%临沂广电分步建设IP网络，认为前期在没有用户的情况下建设IP城域网络及其BRAS等投资浪费严重，所以尝试分期建设网络，一期集中部署两台BRAS，所有市区及县区分前端OLT直接上联至中心BRAS设备。充分利用BRAS设备的二层隔离及其PON设备的隔离特性，减少接入层的二层网络覆盖，以减少VLAN的数量降低维护成本。考虑到大客户发展的不明确性，一期不建设SR路由器，其功能暂时由BRAS来代替，同时探讨了基于上述思路的设备选型问题。
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