CN110995563A - Method for transmitting OTN message by using packet network - Google Patents

Method for transmitting OTN message by using packet network Download PDF

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Publication number
CN110995563A
CN110995563A CN201911334055.5A CN201911334055A CN110995563A CN 110995563 A CN110995563 A CN 110995563A CN 201911334055 A CN201911334055 A CN 201911334055A CN 110995563 A CN110995563 A CN 110995563A
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China
Prior art keywords
otn
mpls
otuk
network
message
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CN201911334055.5A
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CN110995563B (en
Inventor
张林华
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Anhui Wantong Post And Telecommunications Co ltd
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Anhui Wantong Post And Telecommunications Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0077—Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS

Abstract

The method for transmitting the OTN message by using the packet network can solve the technical problem that the existing OTN is based on an MPLS L2VPN network but does not support OTUk electric signals of the OTN as AC side access. The method comprises the following steps: s100, establishing an end-to-end L2VPN session based on MPLS or MPLS-TP; s200, setting an OTUk signal interface as an AC side port of the L2VPN session; s300, the heterogeneous module converts the accessed OTUk service type into an Ethernet service type carried by a PW; s400, the heterogeneous module converts the Ethernet service type carried by the PW back to the accessed OTUk service type. Compared with the existing MPLS L2VPN function, the method for transmitting the OTN message by using the packet network of the invention has the advantages that the newly added function for supporting the OTN signal access can complete the access type of the MPLS L2VPN network by supporting the OTN signal access, thereby avoiding the occurrence of the result that the middle is the MPLS L2VPN network, and the access networks at the two sides are the OTNs but the intercommunication is not possible.

Description

Method for transmitting OTN message by using packet network
Technical Field
The invention relates to the technical field of network communication, in particular to a method for transmitting an OTN message by using a packet network.
Background
The MPLS L2VPN provides a two-layer VPN service based on the MPLS network, so that an operator can provide two-layer VPNs based on different data link layers including ATM, VLAN, Ethernet, PPP, etc. on a unified MPLS network. The MPLS L2VPN is responsible for providing connectivity of two-layer links for VPN users by network operators, and the operators do not need to participate in route calculation of the VPN users.
In short, MPLS L2VPN transparently transports user layer two data across an MPLS network. From the user's perspective, an MPLS network is a two-layer switching network that can establish two-layer connections between different nodes.
Otn (optical Transport network): the optical transport network is a transport network based on wavelength division multiplexing technology and organized in an optical layer, and is a new generation of backbone transport network. The OTN includes optical domain and electrical domain processing, can provide huge transport capacity, completely transparent end-to-end wavelength/sub-wavelength connection and carrier-grade protection, and is an optimal technology for transporting broadband large-granule services. The OTN is composed of a multi-layer frame format, the layers are nested, and the bottom layer is entirely contained in the upper layer. At present, the patent only concerns the frame structure of the OTU (optical Channel Transport unit) and the following layers, and the content above the OTU layer is not considered at all. OTUs are classified by rate rank into OTUk (k =1,2,3), hereinafter referred to as all OTUs 1,2 and 3.
At present, an OTN frame structure based on ITU-T G.709 can support mapping and transparent transmission of various client signals, such as SDH, ATM, Ethernet and the like; but the MPLS L2VPN network does not support OTUk electrical signals of OTN as AC side access.
Disclosure of Invention
The invention provides a method for transmitting an OTN message by using a packet network, which can solve the technical problem that the OTUk electric signal of the OTN is not supported by the existing OTN based on an MPLSL2VPN network and is used as AC side access.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for transmitting OTN messages using a packet network, comprising the steps of:
establishing an end-to-end MPLS L2VPN session based on MPLS or MPLS-tp;
an OTUk signal interface of the OTN is set on the PE equipment to be used as an AC port of the MPLS L2 VPN;
an NSP/IWF (heterogeneous) module on the PE equipment is responsible for converting the service type of the access AC into the service type of PW load, and the method is mainly characterized in that a source MAC, a target MAC and an Ethernet type header are marked on the basis of the original OTUk message to form a layer 2 Ethernet message in a heterogeneous mode;
a FWD (forwarding) module on the PE equipment is responsible for forwarding the heterogeneous messages from the AC side to the PW side;
a PW Pro (PW processor) module on the PE device is responsible for performing PW encapsulation and forwarding related processing on the packet, and the like.
Compared with the existing MPLSL2VPN function, the method for transmitting the OTN message by using the packet network of the invention has the advantages that the newly added function for supporting the OTN signal access can support the OTN signal access, thereby perfecting the access type of the MPLSL2VPN network, and avoiding the occurrence of the result that the MPLS L2VPN network is in the middle, and the OTNs are in the two access networks but cannot be communicated.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is an introduction of a usage scenario in the present invention;
FIG. 3 is a reference model for isomerism in the present invention;
fig. 4 is a flow chart of a process for transmitting an OTN message using a packet network according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
With reference to the flowchart of the method shown in fig. 1, it can be seen that a method for transmitting an OTN packet using a packet network according to the present invention includes the following steps:
s100, establishing an end-to-end L2VPN session based on MPLS or MPLS-TP;
s200, setting an OTUk signal interface as an AC side port of the L2VPN session;
s300, the heterogeneous module converts the accessed OTUk service type into an Ethernet service type carried by a PW;
s400, the heterogeneous module converts the Ethernet service type carried by the PW back to the accessed OTUk service type.
In conjunction with the usage scenario shown in fig. 2 and the heterogeneous reference model shown in fig. 3, fig. 4 illustrates a process flow of the present invention, which includes:
establishing an MPLS L2VPN session between the near-end PE and the far-end PE, and setting an OTN type port as an AC side access port;
the NDP/IWF module of the near-end PE is responsible for carrying out heterogeneous conversion on the OTUk message into an Ethernet type message transmitted by a PW, and the actual processing process is to print a special source MAC, a special target MAC and an Ethernet type header on the basis of the OTUk message to form a 2-layer Ethernet message in a heterogeneous mode;
the FWD module on the near-end PE equipment is responsible for transmitting the heterogeneous message from the AC side to the PW side;
PW PRO module on the near end PE equipment carries out PW encapsulation on the message and forwards the message to MPLS network;
PW PRO module on far-end PE equipment carries out PW decapsulation on the message received from MPLS network, and the message is decoded into an ether type message;
the FWD module on the far-end PE equipment is responsible for forwarding the Ether type message from the PW side to the AC side;
the ndp (iwf) module of the far-end PE is responsible for re-isomerizing the received ethertype packet into an OTUk packet, and the actual processing procedure is to strip off the special source MAC, the special destination MAC and the ethertype header from the received ethertype packet and restore the received ethertype packet into the OTUk packet again.
The following exemplifies a method for transmitting an OTN packet using a packet network according to the present invention:
AC mode configuration of MPLS L2 VPN:
access-pointotu-if
inter-networking Ethernet
Bind s-macxd-macyethernet/ethernet-vlanz
OTN type port of a deviceotu-ifAs an AC side port of the MPLS L2VPN instance, at the same time, the heterogeneous mode is an ethernet type, the binding source MAC is x, the destination MAC is y, and the ethernet type is ethernet or ethernet vlan is z.
The method for transmitting the OTN message by using the packet network adopts the PRO heterogeneous module to enable the OTUk message of the OTN network to be heterogeneously formed into the Ethernet message which can be transmitted in the MPLS L2VPN network, thereby perfecting the access type of the MPLSL2VPN network and realizing the effect that the OTN access networks on two sides communicate with each other through the MPLS L2VPN network in the middle.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (1)

1. A method for transmitting OTN message by using packet network is characterized in that:
the method comprises the following steps:
s100, establishing an end-to-end L2VPN session based on MPLS or MPLS-TP;
s200, setting an OTUk signal interface as an AC side port of the L2VPN session;
s300, the heterogeneous module converts the accessed OTUk service type into an Ethernet service type carried by a PW;
s400, the heterogeneous module converts the Ethernet service type carried by the PW back to the accessed OTUk service type.
CN201911334055.5A 2019-12-23 2019-12-23 Method for transmitting OTN message by using packet network Active CN110995563B (en)

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Citations (7)

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Publication number Priority date Publication date Assignee Title
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CN102630384A (en) * 2011-12-07 2012-08-08 华为技术有限公司 Method of realizing service transport over optical transport network, device and system for implementing method thereof
CN103200467A (en) * 2013-03-14 2013-07-10 烽火通信科技股份有限公司 Device and method for transmitting network element protocol messages in optical network equipment
CN104704759A (en) * 2012-10-08 2015-06-10 华为技术有限公司 Transport functions virtualization for wavelength division multiplexing (wdm)-based optical networks
US20160006502A1 (en) * 2013-01-25 2016-01-07 Telefonaktiebolaget L M Ericsson (Publ) Protection for Optical Transport Network Using Operational Status of Dual Homed Attachment Circuits
CN108989177A (en) * 2018-08-20 2018-12-11 烽火通信科技股份有限公司 A kind of method of the Packet Service configuration of POTN equipment

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CN101860481A (en) * 2010-05-25 2010-10-13 北京邮电大学 Service transport method for distinguishing priority in MPLS-TP over OTN multi-layer network and device thereof
CN102291631A (en) * 2011-08-12 2011-12-21 中兴通讯股份有限公司 Hybrid access and transmission method and device of packet switching and optical transport network service
CN102630384A (en) * 2011-12-07 2012-08-08 华为技术有限公司 Method of realizing service transport over optical transport network, device and system for implementing method thereof
CN104704759A (en) * 2012-10-08 2015-06-10 华为技术有限公司 Transport functions virtualization for wavelength division multiplexing (wdm)-based optical networks
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US20160006502A1 (en) * 2013-01-25 2016-01-07 Telefonaktiebolaget L M Ericsson (Publ) Protection for Optical Transport Network Using Operational Status of Dual Homed Attachment Circuits
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