中國電信cn2網(wǎng)絡(luò)介紹(編輯修改稿)
2025-05-30 18:42 本頁面
【文章內(nèi)容簡介】 verse facilities Only POS interface are used on backbone interconnection to facilitate faster failures detection All work links are active (NOT working and protect) Each PoP’s router pair is connected by multiple routers. Link failure protection is the function of ISIS (layer 3 control) and would not be carried out on transport layer (layer 2 control) (不依賴 SDH或者 DWDm的傳輸層保護 ) ISIS routing protocol Per flow load sharing between dual pairs Failover load sharing Subsecond fast convergence for gold service Three priority LSP flooding and FIB update MPLS FRR 1:1 mode FRR is deployed in core layer for 50 links Sub50ms reroute time Built to maintain utilization not to exceed 50% during normal running As a congestionfree work, CN2 ensures premium priority for delivery of all packets in the core Higher Level of security Strict uRPF is deployed on all customer access interfaces Loose uRPF is deployed on interconnected interface 網(wǎng)間互連端口 Infrastructure ACLs (iACL) deny external traffic to ALL routers interfaces address. iACL are deployed on edges and borders of the work. 在 Cn2網(wǎng)絡(luò)外部接口互連和用戶接口上部署 ACL,不允許任何目的 Ip地址是CN2網(wǎng)絡(luò) ,也就是網(wǎng)絡(luò)外部任何人不能到達 Cn2設(shè)備 . Infrastructure routes are distribted to inter or customer 隱形網(wǎng)絡(luò)設(shè)計 ,也就是在其他網(wǎng)絡(luò)上看不見 CN2網(wǎng)絡(luò)的路由信息 All router access control is manage by AAA servers and syslog (所有的操作都通過 AAA和 syslog) QOS technology would be deployed accordingly to reduce the impact of an attack or worm traffic. 通過 QOS機制保證高等級業(yè)務(wù)不收病毒泛濫等影響 ,通過 QOS控制病毒流量的泛濫 Different class service capability CN2網(wǎng)絡(luò)中 QOS技術(shù)的定位 QOS技術(shù)是統(tǒng)一承載網(wǎng)絡(luò)內(nèi)部資源分配的手段，從資源占用的角度看，是將統(tǒng)一的 IP承載網(wǎng)絡(luò)邏輯上分為不同的資源子網(wǎng)。比如3G，軟交換、 MPLS VPN、 ATM等都可以單獨建網(wǎng)，現(xiàn)在采用IP/MPLS技術(shù)建設(shè)一個網(wǎng)絡(luò)，容量是所有網(wǎng)絡(luò)的疊加，通過 QOS技術(shù)分配資源給不同的業(yè)務(wù)。如 CN2中軟交換和 3G語音流量最大可占用 50%帶寬資源， V應(yīng)用最大允許占用帶寬資源小于 15％。 QOS技術(shù)是網(wǎng)絡(luò)故障或者擁塞情況下，實現(xiàn)業(yè)務(wù)等級區(qū)分的手段，保證高等級業(yè)務(wù)提供。但在正常情況下，目前的 QOS技術(shù)不能實現(xiàn)業(yè)務(wù)等級的質(zhì)量區(qū)分。 QOS技術(shù)是提高網(wǎng)絡(luò)資源利用效率的手段。充分利用 IP網(wǎng)絡(luò)統(tǒng)計復(fù)用的優(yōu)勢，在保證各等級業(yè)務(wù)分配資源的前提下，充分利用部分剩余資源。比如軟交換業(yè)務(wù)最大優(yōu)先占用 50％的資源，如果實際的軟交換業(yè)務(wù)流量只有 20％，剩下的 30％可以被 V等其他業(yè)務(wù)占用。 Different class service capability CN2 QOS positioning QOS is a technique use to allocate limited work resources to different services. Unlike traditional works of ATM, Frame Relay, and lease circuit services, CN2 provides an overlay work for all these services. To differentiate the services base on the class of importance or contract, QOS is the mechanism in place to segregate and allocate work resources to different class of services. Example of a QOS policy: 3G and softswitch traffic can be allocated with at least 50% of the available bandwidth while V can only consume
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