Jing Wu, D. Y. Montuno, H. Mouftah, Guoqiang Wang, A. Dasylva
{"title":"Improving the reliability of the label distribution protocol","authors":"Jing Wu, D. Y. Montuno, H. Mouftah, Guoqiang Wang, A. Dasylva","doi":"10.1109/LCN.2001.990792","DOIUrl":null,"url":null,"abstract":"The LDP (label distribution protocol) is used in the control plane to control an optical network. The data plane and the control plane of an optical network could be physically separate. So a failure in the control plane does not necessarily imply a data plane failure and that user communications have to be interrupted. The standard LDP, however, does not provide any mechanism to recover the knowledge stored in LDP entities about the status of the data plane after the faults are fixed. This is a reliability problem of LDP and results in the unnecessary degradation of user communications. On the other hand, in MPLS-enabled IP networks, being able to recover LDP sessions would be potentially faster and more scalable than to re-establish all affected LSPs. The proposed recovery method of LDP for the control plane failures uses label information mirrors (LIMs) in upstream downstream label switching routers (LSRs). Each LIM is a copy of the label information database (LID) in the LSR of an LDP session. We propose a systematic approach to synchronize the contents of a LIM and the corresponding LID, and show how a LIM is used to handle a control plane failure. Detailed descriptions of the recovery procedure for both control channel failures and control node failures are presented. Some significant features of the proposal are outlined.","PeriodicalId":213526,"journal":{"name":"Proceedings LCN 2001. 26th Annual IEEE Conference on Local Computer Networks","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings LCN 2001. 26th Annual IEEE Conference on Local Computer Networks","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/LCN.2001.990792","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
The LDP (label distribution protocol) is used in the control plane to control an optical network. The data plane and the control plane of an optical network could be physically separate. So a failure in the control plane does not necessarily imply a data plane failure and that user communications have to be interrupted. The standard LDP, however, does not provide any mechanism to recover the knowledge stored in LDP entities about the status of the data plane after the faults are fixed. This is a reliability problem of LDP and results in the unnecessary degradation of user communications. On the other hand, in MPLS-enabled IP networks, being able to recover LDP sessions would be potentially faster and more scalable than to re-establish all affected LSPs. The proposed recovery method of LDP for the control plane failures uses label information mirrors (LIMs) in upstream downstream label switching routers (LSRs). Each LIM is a copy of the label information database (LID) in the LSR of an LDP session. We propose a systematic approach to synchronize the contents of a LIM and the corresponding LID, and show how a LIM is used to handle a control plane failure. Detailed descriptions of the recovery procedure for both control channel failures and control node failures are presented. Some significant features of the proposal are outlined.
LDP (label distribution protocol,标签分发协议)用于控制平面对光网络进行控制。光网络的数据平面和控制平面可以在物理上是分离的。因此,控制平面的故障并不一定意味着数据平面的故障,用户通信必须中断。但是,标准LDP没有提供在故障修复后恢复LDP实体中存储的数据平面状态知识的机制。这是LDP的一个可靠性问题,会导致不必要的用户通信降级。另一方面,在支持mpls的IP网络中,能够恢复LDP会话可能比重新建立所有受影响的lsp更快,更具可扩展性。提出的LDP对控制平面故障的恢复方法是在上下行标签交换路由器(lsr)中使用标签信息镜像(lim)。每个LIM是LDP会话LSR中标签信息数据库(LID)的一个副本。我们提出了一种系统的方法来同步LIM和相应的LID的内容,并展示了LIM如何用于处理控制平面故障。详细描述了控制通道故障和控制节点故障的恢复过程。概述了该提案的一些重要特征。