摘要
在BGP/MPLSVPNs中,用MPLS实现的流量工程主要被限止在单个管理域内。然而,随着企业规模的不断扩大,VPN跨越越来越多的管理域,急需管理域间流量的有效方法。以BGP属性、BGP策略和AS关系为基础的,一方面通过配置LOCAL-PREF属性值,运用输入策略,控制AS的出界流量;另一方面,保证客户AS不在提供者间或对等体间过渡流量,或允许客户AS向它的部分提供者通告路由,或人为增长AS—PATH,控制AS的入界流量。仿真表明此方法能有效地在BGP/MPLSVPNs中用BGP实现域间流量工程。
In BGP/MPLS VPNs,, traffic engineering achieved by using MPLS was predominantly limited to intra-domain and single administrative domain. However with the rapid expansion of enterprise scale, a VPN has demanded a large number of administrative domains. Thus effective management of inter-domain traffic is urgently demanded. Presented the simplest method is on the basis of various BGP attributes, BGP import or export routing policy and AS relationship constructed according to bilateral economical agreements. To implement inter-domain traffic engineering, the best route in an AS depends on the routes coming from its neighboring ASes that apply export routing policies, as well as the import routing policies of the AS. The control of the outgoing traffic is often a requirement for providers that wish to optimize the distribution of their content. For this, they can rely on the LOCAL- PREF attribute to control the routes that will be chosen for the packets that leave each BGP router of the provider. A customer AS serving a large number of individual users or small corporate networks will typically have a very asymmetric inter-domain traffic pattern with several times more incoming than outgoing traffic. These ASes typically need to optimize their incoming traffic only. In order to balancing incoming traffic, ASes are allowed announce their prefixes to a selected subset of providers instead of all providers. According to BGP export policies, an AS cannot act as a transitive AS for its two providers or peers. Simulation shows that our approach can effectively implement inter-domain traffic engineering in BGP/MPLS VPNs.
出处
《计算机科学》
CSCD
北大核心
2006年第12期37-42,共6页
Computer Science
基金
国家自然科学基金资助(Internet故障管理和路由稳定性研究
批准号:60073059
Internet域间路由稳定性和可管理性的研究
批准号:60273078)。
