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Post time 2007-7-25 09:52:06 |Display all floors
Use of MPLS: Multi-Protocol Label Switching is becoming the next WAN service (frame relay vendors are forcing the move to MPLS by refusing to extend frame relay contracts). VoIP requires the highest and most expensive level of QoS. Most IT organizations are subscribing to the lowest level of QoS and do not anticipate the cost for the highest QoS. Get pricing for the highest level of QoS before you select a MPLS provider. Another issue is that if the VoIP traffic exceeds the allotted bandwidth, all calls will suffer voice quality degradation, not just the call that goes over the bandwidth limit. Set up and operate CAC (Call Admission Control) mechanisms for the WAN MPLS paths to avoid voice quality degradation. Depending on the WAN service, most carriers support four basic levels of shaping, from bulk traffic to real-time. You have to make sure that if your WAN is packetized, like MPLS, that you are properly mapping your packets to the WAN color. Also, other technologies such as Carrier Ethernet follow suit. You definitely want to shape at the edge.
使用MPLS:多协议标记交换(MPLS)现在成了下一项广域网服务(帧中继厂商拒绝延长帧中继合同期,从而迫使用户迁移到MPLS)。VoIP需要级别最高、费用最贵的服务质量。大多数IT部门订购的是最低级别的服务质量,并没有事先料到最高服务质量的成本。在选择MPLS提供商之前,了解一下最高级别服务质量的价格。另一个问题就是,如果VoIP 流量超出了已分配带宽,所有呼叫就会出现语音质量下降问题,而不仅仅是超出带宽限制的那些呼叫。为广域网MPLS路径建立及运作呼叫允许控制(CAC)机制,以避免语音质量下降。视广域网服务而定,大多数运营商支持从批量流量到实时流量的四种基本的流量整形级别。你一定要确保:如果你的广域网采用了分包机制,就像MPLS,就要根据广域网特点来设计数据包。另外,电信级以太网等其他技术也是如此。你肯定需要在网络边缘整形流量。

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Post time 2007-7-25 10:20:45 |Display all floors
follow suit 同花色出牌 =>如法炮制; 效仿

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Post time 2007-7-25 10:31:10 |Display all floors

即当WAN是Carrier Ethernet时, 与MPLS一样,  you want to shape at the edge. 这句话应该与

you are properly mapping your packets to the WAN color  意思一样

感觉 是:
客户可以根据自己数据的需求情况来选用相应的WAN的流量整形级别, 确保数据可靠地传输
Stay Hungry, Stay Foolish 求知若饥, 虚心若愚

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Post time 2007-7-25 13:20:29 |Display all floors



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