由於網際網路技術的迅速發展，使得使用者流量迅速成長，因此網路 的存活性問題是現今網際網路最重要的問題之ㄧ，在此篇論文中，我們在 分波多工網際網路中藉由數種不同的保護機制來探討這個問題。在通用多 重協定標籤交換技術中，一條標籤交換路徑的保護不外乎是依序式的保護 機制和整合式的保護機制兩種。在依序式的保護機制中，標籤交換路徑的 保護不外乎是MPLS 層和光層兩種。在MPLS 層中的保護，工作路徑的標籤 交換路徑是經由其來源端至目的端之任一鏈路不重疊之備用標籤交換路 徑所保護;在光層中的保護，工作路徑的標籤交換路徑是經由其來源端至 目的端之任一鏈路不重疊之備用光路徑所保護。而整合式的保護機制，是 整合多層的方式，不侷限於任何一層而較有效的利用資源，進而達到保護 的效果。 爲了達到資源最佳化的效果且減少工作路徑之光電轉換次數，在此篇 論文中，我們除了考慮共用風險鏈路群組觀念外，且藉由引入負載平衡的 觀念和光電轉換參數的路由成本考量，而提出之基於跳躍數和頻寬的整合 式路由演算法(HB-IRA)，進而達到改善網路資源利用率和盡量減少路由成 本的目標，最後，我們經由比較各種保護機制方式之連線請求阻塞率和光 電轉換次數的模擬，證明出我們所提出之方法達到較好的效能。 Due to the explosive growth of user traffic driven by the Internet technology, network survivability has become one of the important issues of internet.deployment. In this thesis, we investigate various kinds of protection approaches in IP/MPLS-over-WDM networks. In GMPLS (Generalized Multi-Protocol Label Switching), an LSP (Label Switch Path) can be protected at either the sequential-routing approach or the integrated-routing approach. In sequential-routing approach, an LSP (LSR) can be protected at either the IP/MPLS layer protection or the optical layer. In IP/MPLS layer protection, an LSP is protected by providing a link-disjoint backup LSP between its end nodes. In optical layer protection, an LSP is protected by the backup lightpath between its end nodes. In integrated-routing approach, an LSP is protected by presenting a multilayer protection scheme for multiclass traffic in IP/MPLS over WDM networks. In order to optimize the network resources and to reduce the number of optical –electrical –optical (o-e-o) conversions, we present an integrated routing algorithm : hop-based and bandwidth-based routing algorithm (HB-IRA). In addition to considering SRLG (Shared Risk Link Group) concept, we indicate that using the load balance and o-e-o parameter can improve network utilization and decrease path cost.. The connection blocking probability and number optical-electrical-optical conversions are used as performance metrics for simulations. Simulation results show that our approach surpass to that of other lightpath protection schemes.
