摘要： 目前有两种支持显式路由LSP的信令方案：受限路由信令传递协议(CR-LDP)和扩展的资源预留协议(RSVP-TE)，文章对两种方案进行了分析和比较。在流量工程中集成QoS技术，是该文讨论的另一个方面。此外，为了实现端到端的服务质量保证，跨ISP的流量工程也面临技术上和实施上的挑战，这可通过IPSs或流量中继的聚集两种方式实现。

关键词: 流量工程, 多协议标记交换, 标记传递协议, 显式路由

Abstract: There are two signaling mechanisms for ER-LSP implementation, one is CR-LDP (extended from LDP), and the other is RSVP-TE (extended from RSVP), analysis and comparison between these two signaling systems are given. To integrate QoS techniques into traffic engineering mechanism is another aspect being discussed here. Moreover, In order to achieve end to end QoS guarantee, traffic engineering that crosses different ISPs remains a challenge in global network, solutions to this problem are: inter provider SLA (IPSs) and traffic trunk aggregation across ISP.

中图分类号: 

• TN915.04