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ptn支持多(duo)種(zhong)(zhong)基(ji)于(yu)分(fen)組交換(huan)業(ye)(ye)(ye)(ye)務(wu)(wu)的(de)(de)雙(shuang)向點對(dui)點連接(jie)(jie)通道(dao)，具(ju)有適(shi)合(he)各種(zhong)(zhong)粗細顆粒業(ye)(ye)(ye)(ye)務(wu)(wu)、端到端的(de)(de)組網能(neng)力，提供(gong)(gong)了(le)(le)(le)更加適(shi)合(he)于(yu)ip業(ye)(ye)(ye)(ye)務(wu)(wu)特性的(de)(de)“柔性”傳(chuan)輸管道(dao)；點對(dui)點連接(jie)(jie)通道(dao)的(de)(de)保護(hu)切換(huan)可(ke)以在50毫(hao)秒(miao)內完成，可(ke)以實現傳(chuan)輸級別的(de)(de)業(ye)(ye)(ye)(ye)務(wu)(wu)保護(hu)和(he)恢復(fu)；繼(ji)承(cheng)了(le)(le)(le)sdh技(ji)術的(de)(de)操作、 管理和(he)維護(hu)機制，具(ju)有點對(dui)點連接(jie)(jie)的(de)(de)完整(zheng)oam，保證(zheng)網絡具(ju)備(bei)保護(hu)切換(huan)、錯誤檢測和(he)通道(dao)監控能(neng)力；完成了(le)(le)(le)與ip/mpls多(duo)種(zhong)(zhong)方(fang)式的(de)(de)互(hu)連互(hu)通，無縫承(cheng)載(zai)核心 ip業(ye)(ye)(ye)(ye)務(wu)(wu)；網管系(xi)統可(ke)以控制連接(jie)(jie)信道(dao)的(de)(de)建立和(he)設置，實現了(le)(le)(le)業(ye)(ye)(ye)(ye)務(wu)(wu)qos的(de)(de)區分(fen)和(he)保證(zheng)，靈活提供(gong)(gong)sla等(deng)優點。
目前(qian)ptn有兩大類技(ji)術(shu)選擇(ze)：多協(xie)議標簽(qian)交(jiao)換傳(chuan)(chuan)送應用(yong)(mpls-tp)及(ji)運營商骨干橋(qiao)接(jie)-流(liu)量(liang)工程(pbb-te)。前(qian)者是(shi)核(he)心網技(ji)術(shu)的(de)向下延(yan)伸，使用(yong)基于ip核(he)心網多協(xie)議標記交(jiao)換(mpls)技(ji)術(shu)，簡(jian)化了(le)復雜的(de)控(kong)制(zhi)協(xie)議，簡(jian)化了(le)傳(chuan)(chuan)送平面；在mpls基礎上(shang)(shang)去(qu)除了(le)倒(dao)數第二跳(php)、標簽(qian)合(he)并及(ji)等價多路徑(ecmp)等無連接(jie)特性，增強(qiang)了(le)oam及(ji)保護倒(dao)換功(gong)(gong)能(neng)(neng)(neng)，提供可靠的(de)qos、帶寬統計復用(yong)功(gong)(gong)能(neng)(neng)(neng)。后(hou)者則是(shi)局域(yu)網技(ji)術(shu)的(de)向上(shang)(shang)擴展，基于ieee 802.1ah的(de)mac-in-mac技(ji)術(shu)，關閉了(le)運營商媒體(ti)訪問控(kong)制(zhi)(mac)地(di)址自學習功(gong)(gong)能(neng)(neng)(neng)，增加(jia)了(le)網管管理和網絡控(kong)制(zhi)的(de)配(pei)置，形(xing)成(cheng)面向連接(jie)的(de)分(fen)組(zu)傳(chuan)(chuan)送技(ji)術(shu)。目前(qian)mpls-tp已成(cheng)為(wei)事(shi)實上(shang)(shang)的(de)主(zhu)流(liu)選擇(ze)。
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