Literal understanding, PTN is generally referred to as the packet transport network, which is including the IPRAN now the set of all solution, but actually speaking of PTN refers to the packet transport network based on MPLS - TP implementation, this is due to the concept of PTN launched, I have been in the direction of the T - MPLS and MPLS - TP evolve, and based on IP/MPLS solution directly by cisco named IPRAN, a subset of the PTN another portal, so both respectively were used as synonymous with two standard down,
Generalized PTN and narrow scope of PTN is a size difference, while the IPRAN is artificially distorted a definition, IPRAN intention refers to the wireless Access Network (Radio Access Network), IP, namely the rebound, Node B to the RNC IP, is the concept of wireless side, on a little understanding should be IPRAN PTN business drivers, and PTN is wireless IPRAN bearing means, cisco to packing a technology, this makes the IPRAN become the pronoun of the solution, is based on the status of the river's lake, this reminds me of the mengniu "along with the change," not only represents the mengniu's an ice cream, a lot of times people go to buy ice cream, you said "I don't know what to eat, just buy it, so he bought a pocket" with the variable "come back," along with the change "became synonymous with" casually ", is classic marketing case, has the same effect and IPRAN,
PTN refers to the grouping network based on MPLS, TP, and IPRAN refers to the grouping based on IP/MPLS network,
Say first PTN (MPLS - TP), we often see a express a formula of the characteristics of the PTN technology, MPLS - TP=MPLS L3 complexity + OAM,
MPLS itself have forwarded based on labels and based on the IP forwarding functions of the two, MPLS - TP is tailored for transport network standard, is the need for a connection-oriented, so PTN removed the MPLS forwarding based on IP connectionless, increased the SDH network has the function of the end-to-end OAM originally, MPLS circuit connection - TP construction with the method of PWE3, and protection of the business and management, maintenance, and other functions are referring to the way of MSTP, can be understood as in addition to the kernel from rigid to flexible, and other aspects of MSTP is very similar,
Say a little bit more simple, the thinking of PTN is in accordance with the original SDH, implement MPLS L2VPN concept "takes doctrine", retained the MPLS connection-oriented and statistical multiplexing of IP, the rest of the functions are as far as possible to the original COPY of the original SDH technology,
Compared with the original PTN IPRAN support comprehensive three-layer forward and routing functions, support the L3 VPN function and three layer multicast function, and the same as PTN made a graphical improvements, the network management interface to realize the end-to-end sophisticated business management, so some people understand the difference between PTN and IPRAN PTN is a layer 2 VPN, and IPRAN is the support of three layers, actually because of the push of the LTE business requirements, the PTN equipment by upgrading also support the function of three layers of VPN, so 2 or 3 layers is not the essential difference between both,
In fact, both the PTN and IPRAN biggest difference lies in the realization of the control plane, control plane of PTN is through the network management implementation, is equivalent to one stood above all equipment manager, according to the entire network routing, bandwidth information to plan as a whole distribution path, bandwidth, distribute labels, actually PTN is no control plane, because of a control plane and management plane together PTN planar integrated the IPRAN management and control the function of the two surfaces, the reason will be PTN control plane is also a separate out said, is to highlight the difference between the two,
The IPRAN plane are implemented on the device, the control of equipment through a variety of routing protocols, label distribution protocol, communicate with each other, to discuss the implementation path selection, resource reserve, and other functions, also can see from the chart, IPRAN contains much more agreement than PTN, IPRAN of equipment to undertake the function of control plane this major,
And it looks like a lot of complicated protocol, implementation is actually a very simple function, the reason is that the machine is not a person, for the machine a bit didn't define it also did not understand clearly, could lead to chaos, so it must be very strict, formulate rules and regulations, ensure the machine can accurate to complete the human want to do, and people are different, a lot of things can be repeated communication, until the problem is resolved, it said programming, programming and protocol, that is a reason why you a punctuation, using the wrong command format, program will not be able to correct execution,
So, to summarize the difference between the two PTN is centralized, IPRAN is a democratic republic, PTN network management is a powerful, monopolizing power, all the people have the final say, all the equipment does not need complex agreement above, as long as you can understand, receives the command line. And IPRAN routing, calculated by the device to communicate with each other for equipment topology, bandwidth resources, label distribution, VPN routing, etc. Every information need complex agreement as agreed, in fact the functions and PTN is the same,
Black cat white cat, catch mice are good cat, for packet transmission network technology selection, too, whether PTN or IPRAN, as long as can meet the requirements of packet transport network is the available technology, the requirements of packet transport network on nothing more than a quarter said: supports a variety of end-to-end business (connection-oriented), high bandwidth utilization (statistical multiplexing), type of SDH protection and management, support the OoS, traffic engineering, the function such as time synchronization, there is no much difference on the function, both
Transfer in 2 g and 3 g era, only the base station to provide center office of pipeline, the LTE phase, X2 interface and MME/SAE Pool load demand, the need for routing between base station network, with the development of technology, 4 g era PTN also gradually to support the function of three layers of VPN, 5 g era, PTN introduced upgraded version SPN, carrying the technology after the dust settles, competition between technology also gradually fade, finally two technologies will also be with big trend gradually towards the integration of communication,
CodePudding user response:
The evolution of packet transport network
CodePudding user response: