IP over WDM網(wǎng)中的策略路由算法
Policy-based dynamic routing and wavelength assignment in IP over WDM networks
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摘要: 業(yè)務(wù)量工程允許管理者通過賦予業(yè)務(wù)主干不同的業(yè)務(wù)量工程屬性來體現(xiàn)一定的管理策略,在為業(yè)務(wù)主干建立標(biāo)記交換路徑(LSP)時(shí)也應(yīng)該考慮這些策略的影響,該文討論了業(yè)務(wù)主干具有不同優(yōu)先權(quán)屬性時(shí)的 LSP建立問題,針對(duì)中斷 LSP個(gè)數(shù)最少和中斷業(yè)務(wù)量最小兩種指標(biāo),分別提出不同的解決策略:最小連接數(shù)中斷法(MCNIM)和最小連接帶寬中斷法(MCBIM),并在不同負(fù)載的動(dòng)態(tài)業(yè)務(wù)下對(duì)所提算法進(jìn)行了仿真研究,給出了仿真結(jié)果。
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關(guān)鍵詞:
- IP over WDM; 綜合路由算法; 路由選擇和波長(zhǎng)分配; 策略路由
Abstract: A traffic trunk can be characterized by administrator in optical traffic engineering, and an attribute of a traffic trunk is a parameter assigned to it which influences its behav-ioral characteristics. The priority attribute defines the relative importance of traffic trunks. If a constraint-based routing framework is used, then priorities become very important in im-plementations permitting preemption. Preemption is used to assure that high priority traffic trunks can always be routed through relatively favorable paths at connection establishment within a differentiated services environment. The main objective of this paper is to discuss how to preempt at Label Switch Path(LSP) establishment according to the attribute of traffic trunk, and two new schemes, Minimum Connection Bandwidth Interrupt Method(MCBIM) and Minimum Connection Number Interrupt Method (MCNIM), arc presented. They make full use of established LSP information to determine how to route an arriving request. Simulation results show that these two schemes can improve the performance of the network significantly. -
S. Seetharaman, et al., IP over optical networks, A summary of issues, Internet Draft, draft-osu-ipo-mpls-issues-02, txt, Apr. 2001.[2]K. Kompella, et al., OSPF extensions in support of generalized MPLS, Internet Draft, draftkompella-ospf-gmpls-extensions-01, txt, Feb. 2001.[3]M. Kodialam, et al., Integrated dynamic IP and wavelength routing in IP over WDM networks,Proc. of IEEE INFOCOM, Anchorage, Alaska, Apr. 2001. ［4］徐世中,李樂民,王晟,多光纖波分復(fù)用網(wǎng)動(dòng)態(tài)路由和波長(zhǎng)分配,電子學(xué)報(bào),2000,28(7),23-27.[4]A. Banerjee, et al., Generalized multiprotocol label switching: an overview of routing and management enhancements, IEEE Commun. Mag., 2001, 39(1), 2-8.[5]D. Awduche, et al., Requirements for traffic engineering over MPLS, Internet RFC2702.[6]D. Awduche, et al., Multi-protocol lambda switching: Combining MPLS traffic engineering control with optical crossconnects, Internet Draft, draft-awduche-mpls-te-optical-03, txt, Apr. 2001. -
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