CN102404153A - Method and device for realizing SDH management network based on DCN and software exchange - Google Patents
Method and device for realizing SDH management network based on DCN and software exchange Download PDFInfo
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- CN102404153A CN102404153A CN2011103880404A CN201110388040A CN102404153A CN 102404153 A CN102404153 A CN 102404153A CN 2011103880404 A CN2011103880404 A CN 2011103880404A CN 201110388040 A CN201110388040 A CN 201110388040A CN 102404153 A CN102404153 A CN 102404153A
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Abstract
The invention discloses a method and a device for realizing SDH (Synchronous Digital Hierarchy) management network based on DCN (Data Communication Network) and software exchange. The method comprises the following steps: providing a DCN channel which is used for bearing SDH services or OAM (Operation Administration and Maintenance) in SDH payload of STM-1; when the DCN channel bears the SDH services, transmitting through the standard STM-1 signal; when the DCN channel bears the OAM, executing the second-layer transfer of the network management information through the software exchange in an IP packet meaner, and directly transferring the network management information to an Ethernet. The invention adopts the DCN channel as the transmission linkage of the SDH management network, adopts the VC-12 unit in the STM-1 payload as the physical channel of OAM information among devices, adopts the software exchange to realize the direct IP transformation of the OAM information among the devices, and effectively solves the problems that the DCC (Data Communication Channel) is adopted as the physical channel of the SDH management network, such as the small bandwidth of the channel, simplification of network elements, privatization of communication protocol and port limitation, so the method and the device can produce positive effects while being applied to MSAP (Multi Service Access Platform) products.
Description
Technical field
The present invention relates to SDH (Synchronous Digital Hierarchy; Synchronous digital hierarchy) is used for constituting the transmission link technical field of managerial grid in; Particularly relate to a kind of method and device based on DCN (Data Communication Network, data communication network) and software exchange realization SDH managerial grid.
Background technology
Being used between transmission equipment the physical channel of management and control information among the SDH is generally DCC (Data Communications Channel, Data Communications Channel).DCC is the physical channel of SDH managerial grid; Referring to shown in Figure 1; In the SDH of STM-1 section overhead, have D1～D12 totally 12 bytes be used to transmit OAM (Operation Administration and Maintenance, operation, management, safeguard) information, wherein D1～D3 is positioned at regenerator section (DCCR); Bandwidth is 3 * 64kbit/s, i.e. 192kbit/s; D4～D12 is used for multiplex section (DCCM), and bandwidth is 9 * 64kbit/s, i.e. 576kbit/s.The transmission link technology that is made up of the SDH managerial grid DCC is such: use the passage of DCC as SDH transmission OAM, OAM information is embedded in the DCC byte of section overhead.All network elements of transmission network all must use the DCC byte, and all OAM informational needs that are embedded in the DCC byte satisfy privately owned communication protocol, could constitute unified webmaster net.
Equipment producer is encapsulated into OAM information in the DCC byte according to proprietary protocol as required, and each network element in the transmission network need all use the DCC byte, and can discern proprietary protocol, and this could be realized with the webmaster net that DCC transmits OAM.If some or several network elements of SDH managerial grid do not use the DCC byte, perhaps the OAM information in the DCC byte is based on different communication protocol, and then this webmaster net can't be communicated with.This shows, adopt DCC to have limitation as the transmission link of SDH managerial grid.
The OAM information of transmission equipment is more and more at present, and the bandwidth capacity of transmission informational needs progressively increases, and is also increasingly high to the standardization requirement of communication protocol between the information.Use DCC to constitute the transmission link of SDH managerial grid; The bandwidth upper limit has only 768kbit/s; All network elements of common transmission network differ to establish a capital and use the DCC byte; Perhaps, adopt DCC all can't realize as the transmission link of SDH managerial grid if the communication protocol of OAM information is inconsistent in each network element DCC byte.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology; A kind of method and device based on DCN and software exchange realization SDH managerial grid is provided; Adopt the transmission link of DCN passage as the SDH managerial grid; With the physical channel of the VC-12 unit in the STM-1 payload as equipment room OAM information; Utilize software exchange to realize the direct IPization of equipment room OAM information, efficiently solve that employing DCC is little as the bandwidth chahnel of SDH managerial grid physical channel, network element unification, communication protocol privatization, the circumscribed problem of interface.
Provided by the invention exchange realizes may further comprise the steps the method for SDH managerial grid based on DCN and software: A, the data communication network DCN passage that carries SDH business or operation management maintain OAM information is provided in the SDH SDH of the 1st grade of synchronous transfer mode STM-1 payload; When B, said DCN passage carry the SDH business, transmit through standard STM-1 signal; When the DCN passage carried OAM, network management information carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet.
In technique scheme, the bandwidth of said DCN passage is 2048kbit/s.
In technique scheme, when said DCN passage carries OAM,, STM-1 select one 12 rank virtual container VC-12 arbitrarily in being numbered 1～63 payload as the DCN passage that carries OAM, and it is professional that all the other VC-12 carry SDH.
In technique scheme, be numbered at STM-1 and select a VC-12 when carrying the DCN passage of OAM in 1～63 the payload arbitrarily, this DCN passage possesses low order expense and the low order warning information of VC-12.
In technique scheme, during the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages.
In technique scheme, if select DCN channel transfer OAM, then further select the VC-12 time slot of DCN channel transfer OAM, when selection is protected the DCN passage, further select the VC-12 time slot of DCN protection passage.
In technique scheme, the flow process that the exchange of software described in the step B is handled is following: the IP bag to the DCN channel transfer is resolved, and judges whether said IP bag is the bag to this locality, if then deliver to the IP layer and handle; Otherwise inquiry medium access control MAC port Hash HASH table judges that whether said IP bag is in the HASH table, if then transmit to corresponding port; Otherwise, to other port broadcasting.
Use the device based on DCN and software exchange realization SDH managerial grid of said method, comprising: the DCN passage provides module, and being used for provides the DCN passage that carries SDH business or OAM at the SDH of STM-1 payload; Carry the content choice module, be used to select the DCN passage to carry the professional or carrying OAM of SDH; The STM-1 signal transmission module is used for when the DCN passage carries the SDH business, transmitting through standard STM-1 signal; Software forwarding module based on MAC is used to realize the Layer 2 data function of exchange, directly sends the IP bag that is received by the DCN passage through Ethernet interface, and the IP bag that perhaps Ethernet interface is received is forwarded on the DCN passage; When the DCN passage carried OAM information, OAM information was carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet.
In technique scheme; Also comprise the DCN channel selecting module; Be used for when the DCN passage carries OAM; Be numbered at STM-1 and select a VC-12 as the DCN passage that carries OAM in 1～63 the payload arbitrarily, it possesses low order expense and the low order warning information of VC-12, and all the other VC-12 carry SDH business.
In technique scheme; Comprise that also synchronous protection switches module; Be used to realize that the protection of DCN passage and STM-1 service synchronization switches, during the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages.
Compared with prior art, advantage of the present invention is following:
(1) the present invention adopts the transmission link of DCN passage as the SDH managerial grid; With the physical channel of the VC-12 unit in the STM-1 payload as equipment room OAM information; Utilize software exchange to realize the direct IPization of equipment room OAM information, efficiently solve that employing DCC is little as the bandwidth chahnel of SDH managerial grid physical channel, network element unification, communication protocol privatization, the circumscribed problem of interface.
(2) the present invention is for the managerial grid transmission link of complicacy, effective simplification the transmission course of OAM.The present invention can be docked with original SDH transmission equipment; Do not need each network element to possess DCN and software function of exchange; Support the device just of this function to want an IP address, can avoid the many network elements DCC planning of complicacy and the restriction of proprietary protocol, make link more succinct.
(3) the present invention is applied in the SDH managerial grid, has strengthened on the one hand the transmission bandwidth of OAM, can realize the function of the direct IPization of OAM on the other hand, makes the OAM communication protocol standardization, has satisfied user's demand.
(4) the present invention is applied to can produce good effect in MSAP (Multi Service Access Platform, the access multiservice platform) product.
Description of drawings
Fig. 1 is the structural representation of traditional DCC.
Fig. 2 is the structural representation of DCN in the embodiment of the invention.
Fig. 3 is the structural representation of software exchange in the embodiment of the invention.
Fig. 4 is a structural representation of realizing DCN passage and software exchange in the embodiment of the invention in the SDH payload.
Fig. 5 is the flow chart that DCN is provided with and the software exchange is handled in the embodiment of the invention.
Fig. 6 is that exchange realizes that the equipment of SDH managerial grid is connected sketch map with the SDH equipment of traditional STM-1 with software based on DCN in the embodiment of the invention.
Fig. 7 is the sketch map that connects between the equipment based on DCN and software exchange realization SDH managerial grid in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description.
The method based on DCN and software exchange realization SDH managerial grid that the embodiment of the invention provides may further comprise the steps:
A, the DCN passage that carries SDH business or OAM is provided in the SDH payload of STM-1 (the 1st grade of synchronous transfer mode), the structure of DCN is referring to shown in Figure 2 in the embodiment of the invention, and the bandwidth of DCN passage is 2048kbit/s; The DCN passage is as transmission channel, can select the content that the DCN passage carries through software, can select to carry between SDH business or network element and the webmaster, the OAM information between network element and the network element.
When B, DCN passage carry the SDH business, transmit through standard STM-1 signal; When the DCN passage carried OAM, network management information carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet.
When the DCN passage carries OAM; Be numbered at STM-1 and select a VC-12 (Virtual Container in 1～63 the payload arbitrarily; Level 12; 12 rank virtual containers) as the DCN passage that carries OAM, this DCN passage possesses low order expense and the low order warning information of VC-12, and it is professional that all the other VC-12 carry SDH.
The DCN passage can be provided with protection with the STM-1 service synchronization and switch;
During the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages, function is identical; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages, as a DCN passage do not enable with or when high severity alarm occurring, can be switched to another DCN passage.
If select DCN channel transfer OAM, then further select the VC-12 time slot of DCN channel transfer OAM, when selection is protected the DCN passage, further select the VC-12 time slot of DCN protection passage.
The flow process that the software exchange is handled is following: the IP bag to the DCN channel transfer is resolved, and judges whether said IP bag is the bag to this locality, if then deliver to the IP layer and handle; Otherwise inquiry medium access control MAC port Hash HASH table judges that whether said IP bag is in the HASH table, if then transmit to corresponding port; Otherwise, to other port broadcasting.
In order to realize said method; The embodiment of the invention provides a kind of device based on DCN and software exchange realization SDH managerial grid; Comprise that the DCN passage provides module, carrying content choice module, STM-1 signal transmission module, the software forwarding module based on MAC, DCN channel selecting module and synchronous protection to switch module; Wherein, the DCN passage provides module, and being used for provides the DCN passage that carries SDH business or OAM at the SDH of STM-1 payload; Carry the content choice module, be used to select the DCN passage to carry the professional or carrying OAM of SDH; The STM-1 signal transmission module is used for when the DCN passage carries the SDH business, transmitting through standard STM-1 signal; Software forwarding module based on MAC is used to realize the Layer 2 data function of exchange, directly sends the IP bag that is received by the DCN passage through Ethernet interface, and the IP bag that perhaps Ethernet interface is received is forwarded on the DCN passage; When the DCN passage carried OAM, network management information carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet; The DCN channel selecting module; Be used for when the DCN passage carries OAM; Be numbered at STM-1 and select a VC-12 as the DCN passage that carries OAM in 1～63 the payload arbitrarily, it possesses low order expense and the low order warning information of VC-12, and all the other VC-12 carry SDH business; Synchronous protection is switched module; The SDH service synchronization protection that is used to realize DCN passage and STM-1 is switched, and is during the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages.
The DCN passage that each equipment can be selected to dispose in the STM-1 signal carries SDH business or OAM information; When the STM-1 of equipment room does not protect each other, separate between the DCN of each STM-1, can select arbitrarily carrying the SDH business or carrying OAM information; When the STM-1 of equipment room protects each other, also protection each other between the DCN of each STM-1.
The DCN passage carries between network element and the webmaster, during OAM information between network element and the network element, is the IP bag of content with receiving, send with OAM information as transmission channel; Through software forwarding module, realize the Layer 2 data function of exchange, thereby can directly realize that through Ethernet interface the webmaster of equipment is interconnected based on MAC.When the DCN passage is set to carry OAM information, possess low order expense and the low order warning information of VC-12; Ethernet interface can send by the IP bag that receives on the DCN passage, also can the IP bag that Ethernet interface receives be forwarded on the DCN passage.Each equipment needs an IP address, avoids complicated planning of a plurality of IP address and routing configuration work.
When exchange realizes equipment and traditional SDH equipment interconnection of SDH managerial grid based on DCN and software; Can change the protocol converter of Ethernet through E1; IP in corresponding time slot DCN passage bag is changeed among the E1 of protocol converter of Ethernet to E1 down, and the Ethernet interface through protocol converter is sent to Ethernet with equipment room OAM information.
When docking each other between the equipment based on DCN and software exchange realization SDH managerial grid; Can be through selecting the DCN passage of different time-gap or different STM-1; Directly realize the mutual biography of equipment room OAM information, or realize the cascade of DCN passage, the mutual biography of OAM between network element device in the support multiple network topology.
Referring to shown in Figure 3, from the DCN passage, parse IP bag after, through software forwarding module, realize the Layer 2 data function of exchange, thereby can directly realize that through Ethernet interface the webmaster of equipment is interconnected based on MAC.Software forwarding module based on MAC is to realize the functional module that software is transmitted at sending and receiving bag place, and forwarding HASH (Hash) table that MAC of this module maintenance is corresponding with port adds record through packet receiving study to this table, and the regularly aging function of work.During packet receiving, analyze the packet of receiving from port, if broadcasting or receive then that to local packet the IP layer handles, otherwise the MAC port HASH of inquiry maintenance table then transmits to corresponding port, can not find out record and then broadcasts to other port.
Referring to shown in Figure 4, in the SDH frame payload of each STM-1, all can select any VC-12 in 1～63 as the DCN passage of transmission OAM, also can be with this DCN passage as carrying the professional service channel of STM-1.
Referring to shown in Figure 5, the flow process that DCN is provided with and the software exchange is handled is following:
Step 101: select the content of DCN channel transfer, judge whether the DCN passage is the passage of transmission OAM, if forward step 103 to; Otherwise forward step 102 to;
Step 102:DCN channel transfer SDH is professional, returns step 101;
Step 103: the VC-12 time slot of selecting transmission OAM;
Step 104: judge whether to carry out path protection, if forward step 105 to; Otherwise forward step 106 to;
Step 105: if protection then selects DCN to protect the VC-12 time slot of passage;
Step 106: the IP bag to the DCN transmission is resolved;
Step 107: whether be bag to this locality, if forward step 108 to if detecting; Otherwise forward step 109 to;
Step 108: if local bag is then received the processing of IP layer;
Step 109: if not local bag is then inquired about MAC port HASH table;
Step 110: judge should bag whether in the HASH table, if forward step 111 to; Otherwise forward step 112 to;
Step 111: if in the HASH table, then transmit to corresponding port;
Step 112: if not in the HASH table, then to other port broadcasting.
Referring to shown in Figure 6; In the embodiment of the invention based on DCN and software when exchange realizes that the device of SDH managerial grid is connected with the SDH equipment of traditional STM-1; The IP bag that has loaded OAM transmits through the DCN passage, and traditional SDH equipment need not to possess simultaneously DCN passage and software forwarding capability; When down SDH is professional,,, can OAM be transferred to any network element through Ethernet through E1 commentaries on classics Ethernet protocol transducer with the VC-12 of the corresponding time slot of the DCN that has loaded OAM institute.
Referring to shown in Figure 7; In the embodiment of the invention based on DCN and software when exchange realizes that the device of SDH managerial grid interconnects each other; Network element I, II, III all possess DCN passage and software function of exchange, and network element I and II can directly exchange the mutual biography that realizes equipment room OAM information through DCN1 and software; Network element I and III can directly exchange the mutual biography that realizes equipment room OAM information through DCN2 and software, simultaneously, through the cascade of DCN passage between network element II and the III, also can realize the mutual biography of OAM information between network element I and the III.Through selecting the DCN passage of different time-gap or different STM-1, can realize the SDH managerial grid of multiple network topology.
In sum, the embodiment of the invention is for the managerial grid transmission link of complicacy, effective simplification OAM transmission of Information process.If in the SDH managerial grid, adopt the embodiment of the invention; Strengthened OAM transmission of Information bandwidth on the one hand; Can realize the function of the direct IPization of OAM information on the other hand, make between network element and the webmaster, the OAM information communication consensus standardization between network element and the network element, satisfy user's demand.The embodiment of the invention can be docked with original SDH transmission equipment; Do not need each network element to possess DCN software function of exchange; Support the device just of this function to want an IP address, can avoid the many network elements DCC planning of complicacy and the restriction of proprietary protocol, make link more succinct.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (10)
- One kind based on DCN and software exchange realizes it is characterized in that the method for SDH managerial grid may further comprise the steps:A, the data communication network DCN passage that carries SDH business or operation management maintain OAM information is provided in the SDH SDH of the 1st grade of synchronous transfer mode STM-1 payload;When B, said DCN passage carry the SDH business, transmit through standard STM-1 signal; When the DCN passage carried OAM, network management information carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet.
- 2. the method based on DCN and software exchange realization SDH managerial grid as claimed in claim 1, it is characterized in that: the bandwidth of said DCN passage is 2048kbit/s.
- 3. the method based on DCN and software exchange realization SDH managerial grid as claimed in claim 1; It is characterized in that: when said DCN passage carries OAM; Be numbered at STM-1 and select one 12 rank virtual container VC-12 as the DCN passage that carries OAM in 1～63 the payload arbitrarily, it is professional that all the other VC-12 carry SDH.
- 4. the method based on DCN and software exchange realization SDH managerial grid as claimed in claim 3; It is characterized in that: be numbered at STM-1 and select a VC-12 when carrying the DCN passage of OAM in 1～63 the payload arbitrarily, this DCN passage possesses low order expense and the low order warning information of VC-12.
- 5. as claimed in claim 1 exchange realizes it is characterized in that the method for SDH managerial grid based on DCN and software: during the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages.
- 6. the method based on DCN and software exchange realization SDH managerial grid as claimed in claim 5; It is characterized in that: if select DCN channel transfer OAM; Then further select the VC-12 time slot of DCN channel transfer OAM; When selection is protected the DCN passage, further select the VC-12 time slot of DCN protection passage.
- 7. like each described method of claim 1 to 6 based on DCN and software exchange realization SDH managerial grid; It is characterized in that: the flow process that the exchange of software described in the step B is handled is following: the IP bag to the DCN channel transfer is resolved; Judge whether said IP bag is the bag to this locality; If then deliver to the IP layer and handle; Otherwise inquiry medium access control MAC port Hash HASH table judges that whether said IP bag is in the HASH table, if then transmit to corresponding port; Otherwise, to other port broadcasting.
- 8. application rights requires the device based on DCN and software exchange realization SDH managerial grid of 1 to 7 each said method, it is characterized in that comprising:The DCN passage provides module, and being used for provides the DCN passage that carries SDH business or OAM at the SDH of STM-1 payload;Carry the content choice module, be used to select the DCN passage to carry the professional or carrying OAM of SDH;The STM-1 signal transmission module is used for when the DCN passage carries the SDH business, transmitting through standard STM-1 signal;Software forwarding module based on MAC is used to realize the Layer 2 data function of exchange, directly sends the IP bag that is received by the DCN passage through Ethernet interface, and the IP bag that perhaps Ethernet interface is received is forwarded on the DCN passage; When the DCN passage carried OAM, network management information carried out two layers of forwarding with the IP packet form through the software exchange, directly passes to Ethernet.
- 9. the device based on DCN and software exchange realization SDH managerial grid as claimed in claim 8; It is characterized in that: also comprise the DCN channel selecting module; Be used for when the DCN passage carries OAM; Be numbered at STM-1 and select a VC-12 as the DCN passage that carries OAM in 1～63 the payload arbitrarily, it possesses low order expense and the low order warning information of VC-12, and all the other VC-12 carry SDH business.
- 10. like claim 8 or 9 described devices based on DCN and software exchange realization SDH managerial grid; It is characterized in that: comprise that also synchronous protection switches module; Be used to realize that the protection of DCN passage and STM-1 service synchronization switches, during the SDH service selection 2+0 mode of operation of STM-1, separate between two DCN passages; During the SDH service selection 1+1 mode of operation of STM-1, protection each other between two DCN passages.
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