IP承载网技术讲座 第5讲 IP城域网关键技术——PBT技术

Series of Lectures IP Carrier Networks Part 5:Key Technology on IP MAN——PBT Technology

PBB是一种MAC-in-MAC技术,目的是实现用户MAC在骨干网的隔离,从而避免骨干网络不必要的大MAC表项管理,原理类似于QinQ技术,只不过一个是屏蔽用户MAC,而另一个则是屏蔽用户VLAN,两者的技术依据都是保持骨干桥的交换机制保持不变,同时提升了业务的扩展性。PBT技术(现称PBB-TE)则借用PBB帧格式,修改控制功能,关闭以太网MAC地址学习和STP协议,采用隧道方式转发和规划流量,从而为流量控制、接入控制和业务控制。

PBB is a MAC-in-MAC technology, aimed at achieving MAC users in the backbone of segregation, and thus avoid unnecessary backbone network of the MAC table management, principles similar to QinQ technology, is only one shield users MAC, and Another is shielding the user VLAN, based on both the technical backbone of the bridge are to maintain the exchange mechanism remains unchanged, at the same time enhance the expansion of the business. PBT technology （now called the PBB-TE） is borrowed PBB frame format, modify control function, close Ethernet MAC address learning and STP agreement, transmitted by the tunnel and traffic planning, so as to flow control, access control and operational control, Fast switching or disaster recovery capabilities and provide end-to-end QoS protection possible.