subject: Operators are required in the implementation of MPLS TE concerns - operators, TE-communications indu [print this page] Operators are required in the implementation of MPLS TE concerns - operators, TE-communications indu
I. Introduction Associated with MPLS technology
many branches, such as MPLSRouting, L3VPN, L2VPN, MPLSMulti-cast, MPLSQoS etc.; which some of the applications and techniques, such as RFC2547bis of L3VPN, more than at home and abroad has been used successfully and a large number of ISP deployment, but other technologies and applications such as multicast and QoS are in development and maturity, also some other techniques such as MPLSTE have been basically established, to be part of the operators in foreign countries to accept and adopt, but virtually no application in the country.
On traffic projects, before the advent of the MPLS technology, network administrators had initially realized by other means, mainly by adjusting the IGP link or the use of multiple IGP Metric to divert the plane between different POP traffic. MPLSTE benefits of adjustment to overcome the traditional shortcomings of Metric, these deficiencies include: the adjustment of the IGPMetric MPLSTE not stand the comprehensive considerations of the global matrix of network traffic flows on each link Metric partial adjustment will affect the whole changes in network traffic, which indeed affect the whole body; and that the adjustment of the local link changes brought the whole network may be unable to predict, and solve the traffic of this link, it lead to other links congestion, the "press gourd floating scoop"-like feeling; addition to the IGPMetric adjustment is not an effective way to control the transmission according to the source flow path, but only according to its destination; Finally, adjust the Metric method is complex easily lead to routing loop.
, Of course, based on MPLS traffic engineering in giving people a new choice is also a cost. This choice, like with any new technology, would force people to learn a new mode of operation, to break the traditional experience and thinking by the new theory to configure the network in order to achieve flow control.
In addition, the introduction of MPLSTE, the need to clearly recognize that any technology are not omnipotent, it can solve some key problems, but can not solve all problems. Each operator will be the situation for their own networks, business characteristics on whether to adopt new technologies as well as the cost of each new technology brings a choice between.
2, TE Functional Description First introduce MPLSTE general functions: 1. Improve and optimize bandwidth utilization and delay bandwidth expansion;
2. Unlike the conventional methods can be realized IGPMetric bandwidth, flow, flow, load-sharing to achieve control and avoid the implementation of load sharing based on IGPMetric pinhole effect will occur;
3. Can respond to emergencies, the network link / node failures caused by changes in flow topology new pattern;
4. Detailed matrix of the network traffic measurement, time and network bandwidth resources to understand the situation, guide the network planning and link upgrade;
5. Based on the FRR TE 50ms level provides the physical link, the device node protection;
6. End TELSPTunnel itself can provide rapid protection.
In the practical implementation and deployment of TE, due to different mechanisms exist to achieve TE functional differences and contradictions, it is difficult to provide in a network, all of the features, the need for a detailed classification of TE and FRR to understand in order to meet the operational development the actual needs of TE networks deployment strategy.
3, tactical-type TE - NativeIP TE under network environment
If the IP backbone network operators usually do not enable MPLS, is a "RowIP" or "NativeIP" network, in which the network structure, we can use "tactical TE" to achieve traffic engineering.
