CN109561012B - Communication method for SDH network and packet network - Google Patents
Communication method for SDH network and packet network Download PDFInfo
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- CN109561012B CN109561012B CN201811572207.0A CN201811572207A CN109561012B CN 109561012 B CN109561012 B CN 109561012B CN 201811572207 A CN201811572207 A CN 201811572207A CN 109561012 B CN109561012 B CN 109561012B
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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
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
- H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
Abstract
A communication method of an SDH network and a packet network can solve the problem of the intercommunication between the packet network and a dedicated line of the SDH network. The method comprises the steps that a VCG interface and a uLei interface are in one-to-one bridging connection in a control plane configuration device; SDH to packet direction: the forwarding plane converts the code stream transmitted to the device from the SDH network into an Ethernet message format through EOS decoding; the forwarding plane bridges a message received by the VCG interface to the uLei interface; the uLei interface packages the MPLS label according to the bound VPN information and forwards the MPLS label to a packet network; packet network to SDH direction: if the interface found by the packet network MPLS label is a uLei interface, bridging to a VCG interface of the SDH after the corresponding packet forwarding action is executed; the SDH processing unit carries out EOS processing on the Ethernet message, converts the Ethernet message into an SDH code stream, maps the SDH code stream into a corresponding VC12 and sends the SDH code stream to an SDH network. The invention can connect the SDH network with the packet network, and meets the requirement of interconnection and intercommunication between the SDH network and the packet network.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a communication method of an SDH network and a packet network.
Background
The method is characterized in that a special line of a client of the government and the enterprise is constructed based on a packet network, a VPWS (virtual Private Wire service) technology is generally adopted, the VPWS technology is built on an infrastructure of an mpls network, high-speed two-layer transparent transmission is provided between a pair of ports of two routers, an original Ethernet message of a local PE device can be transparently transmitted to a far-end PE device, the protocol is a point-to-point two-layer VPN protocol, and a PTN/IP RAN network based on the VPWS technology is adopted by an operator at present to construct the special line of the client of the government and the enterprise.
The traditional ethernet private line for client of government and enterprise generally adopts the EoS technology (Ether over SDH) to transparently transfer two-layer messages between the user access ports of two SDH devices through a SDH network opening point to point private line, the SDH devices bind the user access ports to a virtual Concatenation group VCG (virtual Concatenation group), and the VCG can be a binding of a plurality of VCs 12, VC3 and VC4 according to the requirement of the bandwidth of the private line of the client.
When a telecommunication operator opens a special line of a government enterprise, a demand exists: the point-to-point mapping intercommunication is needed between the old SDH private network and the emerging PTN/IP RAN packet private network based on VPWS technology.
Disclosure of Invention
The invention provides a communication method of an SDH network and a packet network, which can solve the problem of the intercommunication between the packet network and a dedicated line of the SDH network.
In order to achieve the purpose, the invention adopts the following technical scheme:
a communication method between an SDH network and a packet network comprises the following steps:
and the control plane processing comprises three parts of SDH basic configuration, VPWS basic configuration and uLei bridge interface configuration.
The SDH basic configuration comprises configuration of a single channelized interface (VC12, VC3 and VC4), configuration of a virtual VCG interface, configuration of a channelized VC interface bound into a VCG interface, other attribute configuration and the like, wherein the VCG is not bound with a user port.
The basic configuration of VPWS includes the configuration of basic routing, the configuration of LDP protocol and the configuration of PW pseudo-wire, wherein the PW is not bound with a user AC interface.
The uLei interface configuration section defines two interfaces uLei1, uLei2, where uLei1 is responsible for the SDH side virtual user interface, where the VCG is bound to uLei 1. The uLei2 is used as an AC port of the VPWS on the packet side, and the uLei1 port and the uLei2 port are bound to realize the intercommunication of the VPWS and the EOS.
The forwarding plane is divided into a forwarding table module and a forwarding module; wherein the content of the first and second substances,
the forwarding table module is generated by the control plane, and executes a search action, and comprises an access port VPWS configuration information table, a VCG information table, a port attribute table, a physical information table, a uli port bridging table, an ARP table and an MPLS label table.
The forwarding module is divided into two parts from the SDH network to the packet network and from the packet network to the SDH network.
The SDH side processing module is responsible for recovering the code stream received from the SDH interface into the user original Ethernet packet message and carrying the corresponding VCG number to send to the packet processing module, the packet processing module searches the VCG information table according to the VCG port number to obtain the uLei1 port corresponding to the VCG information table, then finds the corresponding uLei2 port bound into the packet network through bridging, namely the AC port of the packet network VPWS, searches the PW information according to the AC port, finally encapsulates the forwarding information such as MPLS label, MAC head and the like, and sends the message out from the outlet interface of the packet network.
It can be seen from the above that, the method for implementing the intercommunication between the SDH network and the packet network of the present invention, the processing from the packet network to the SDH network forwarding plane, the device receives the MPLS label packet from the packet network through the packet network side interface, performs operations such as label stripping, etc., finds the corresponding AC interface through the PW label, which should be the uLei2 interface, obtains the uLei1 interface according to the bridging information, finally obtains the VCG number in the uLei1 port attribute table, finds the VCG information table to obtain the corresponding VCG port and VC binding information, and the SDH side processing module is responsible for converting the packet into an SDH code stream and sending the SDH code stream into the SDH network.
Compared with the prior art, the invention uses a pair of uLei virtual port bridging technology, one PW for binding the packet network and the other corresponding to the VCG interface of the SDH network, thereby achieving the purpose of connecting the SDH network and the packet network and meeting the requirement of interconnection and intercommunication between the SDH network and the packet network.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a networking application of the present invention;
fig. 3 is a schematic block diagram 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.
As shown in fig. 1, the communication method between the SDH network and the packet network according to this embodiment includes the following steps:
s100, virtualizing a virtual VCG interface by a control plane for identifying a plurality of VC12 bindings of an SDH network;
s200, a virtual uLei interface is established by a control plane and used as an Ethernet forwarding interface of a packet network;
s300, configuring a uLei interface as an AC access interface of the L2VPN (VPWS) by a control plane;
s400, internally bridging the VCG interface and the uLei interface one to one by the control plane configuration equipment;
s500, SDH to packet direction: the forwarding plane converts the code stream transmitted to the device from the SDH network into an Ethernet message format through EOS decoding, and the message is received from a virtual VCG interface;
s600, bridging a message received by a forwarding plane corresponding to the VCG interface to a uLei interface;
s700, the uLei interface packages the MPLS label according to the bound VPN information and forwards the MPLS label to a packet network;
s800, packet network to SDH direction: if the interface found by the packet network MPLS label is a uLei interface, bridging to a VCG interface of the SDH after the corresponding packet forwarding action is executed;
and S900, the SDH processing unit performs EOS processing on the Ethernet message, converts the Ethernet message into an SDH code stream, maps the SDH code stream into a corresponding VC12, and transmits the SDH code stream to an SDH network.
The above steps are further explained below with reference to fig. 2 and 3:
step A: the control plane of the device creates a pair of uLei interfaces (uLei1 and uLei2) and bridges the pair of uLei interfaces one to one. Configuring a two-layer VPN (VPWS) pseudo wire, and accessing a uLei2 port as a user side interface of the packet network of the equipment. Through the LDP protocol operated on the Ethernet output interface of the packet network, the far-end PE distributes labels to the local PE, a label forwarding table with the label value as a key value is formed on the far-end PE equipment, and the output interface of the table entry is a user side interface; forming an entry taking a user input interface as a key value in the local PE equipment, wherein the content of the entry comprises the label value, and an output interface of the entry is an Ethernet port;
and B: the control plane of the device creates a single channelized interface (corresponding to VC12, VC3 and VC4), virtualizes VCG interfaces, binds one or more channelized interfaces into a VCG interface, and configures the binding of the VCG interface and a virtual bridge interface uLei 1;
and C: from SDH network to packet network, forwarding plane SDH side, recovering SDH code stream to user original message by EOS technique, obtaining VCG port number bound by it according to VC layer information, sending Ethernet message carrying VCG port number to forwarding plane packet side for processing;
step D: after the forwarding plane packet side of the device receives the message, looking up the table entry generated in the step B by using the VCG port number information carried by the message as a key value, finding the uLei1 port corresponding to the VCG, and finding the uLei2 port according to the ulii bridging information table in the step A, wherein the uLei2 port is the AC port of the VPWS on the packet side;
step E: the packet side processing module uses the uLei2 port as an AC port key value to search the VPWS table item generated in the step A, obtain an MPLS encapsulation label and an Ethernet output port, and carry out MPLS encapsulation on the user two-layer message, namely, an MPLS label and an MAC head are added in front of a two-layer head;
step F: b, the local PE device sends the packaged message in the step E to a physical output port of a packet network side according to the output port information searched in the step A; and the delivery from the SDH network to the MPLS packet network is realized.
Step G: from the packet network to the SDH network, the forwarding plane packet side receives the message from the PW side, searches the label table according to the table entry generated in the step A, and peels off the MPLS label, the MAC header and the like to obtain the original message;
step H: according to the table entry in the step A, obtaining that the AC outlet interface at the user side is uLei2 port, obtaining uLei1 port in the bridging table corresponding to uLei2, wherein the uLei1 port is an SDH side bridging interface, and obtaining corresponding VCG port information according to the information in the uLei1 port attribute table;
step I: at the forwarding plane SDH side, using the port number of the VCG as a key value to search the table entry generated in the step B, obtaining the information of the outgoing VCG interface, and delivering the information to an EOS processing module of the SDH;
step J: and the EOS processing module at the SDH side converts the received Ethernet message into a code stream and sends the code stream to an SDH network. And realizing the delivery of the message from the packet network to the SDH network.
The above steps complete the interconnection communication between the SDH network and the packet network.
To sum up, the embodiment of the present invention uses a pair of uLei virtual port bridging technologies, one PW binding to the packet network, and one corresponding to the VCG interface of the SDH network, so as to achieve the purpose of connecting the SDH network and the packet network, and meet the requirement of interconnection and intercommunication between the SDH network and the packet network.
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 (4)
1. A communication method between SDH network and packet network is characterized in that: the method comprises the following steps:
s100, a virtual VCG interface is created by a control plane and used for identifying a plurality of VC12 bindings of the SDH network;
s200, the control plane creates a pair of virtual uLei1 and uLei2 interfaces, the uLei1 interface is used as an Ethernet forwarding interface of the packet network, and the uLei1 and uLei2 interfaces are bridged;
s300, configuring a uLei2 interface as an AC access interface of the L2VPN by the control plane;
s400, internally binding the VCG interface and the uLei1 interface one to one by the control plane configuration equipment;
s500, SDH to packet direction: the forwarding plane converts the code stream transmitted from the SDH network to the local PE equipment into an Ethernet message format through EOS decoding, and the message is received from the virtual VCG interface;
s600, the forwarding plane searches VCG table items for a message received by the VCG interface to obtain a uLei1 output interface, and finds a uLei2 interface through bridging information;
s700, the interface uLei2 encapsulates the MPLS label according to the bound VPN information and forwards the MPLS label to a packet network;
s800, packet network to SDH direction: if the interface found by the MPLS label of the packet network is the uLei2 interface, the interface is bridged to the uLei1 interface after the corresponding packet forwarding action is executed, and then the VCG information table is searched through the VCG information in the interface attribute table to obtain the VCG interface of the SDH;
and S900, the SDH processing unit performs EOS processing on the Ethernet message, converts the Ethernet message into an SDH code stream, maps the SDH code stream into a corresponding VC12, and transmits the SDH code stream to an SDH network.
2. The communication method between the SDH network and the packet network according to claim 1, wherein: the step S400 specifically includes:
s401: configuring a two-layer VPN pseudo wire, and accessing a uLei2 port as a user side interface of a local PE equipment packet network; through the LDP protocol operated on the Ethernet output interface of the packet network, the far-end PE distributes labels to the local PE equipment, a label forwarding table with the label value as a key value is formed on the far-end PE equipment, and the output interface of the table entry is a user side interface; the local PE device forms an entry with the user input interface as a key value, the content of the entry contains the label value, and the output interface of the entry is an Ethernet port.
3. The communication method between the SDH network and the packet network according to claim 2, wherein: the step S400 further includes:
s402: the local PE device control plane creates a single channelized interface, a virtual VCG interface, and ties the channelized interface into the VCG interface and configures the VCG interface to be tied with the virtual bridging interface uLei 1.
4. The communication method between the SDH network and the packet network according to claim 3, wherein: the step S900 specifically includes:
s901: at the forwarding plane SDH side, using the VCG port number as a key value to search for the entry generated in step S401, obtaining VCG interface information, and passing it to an EOS processing module of SDH;
s902: and the SDH side EOS processing module converts the received Ethernet message into a code stream and sends the code stream to an SDH network, so that the message is delivered from the packet network to the SDH network.
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