CN1878129A - Isolation method for two-layer service between websites in RPR - Google Patents
Isolation method for two-layer service between websites in RPR Download PDFInfo
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- CN1878129A CN1878129A CNA2005100751105A CN200510075110A CN1878129A CN 1878129 A CN1878129 A CN 1878129A CN A2005100751105 A CNA2005100751105 A CN A2005100751105A CN 200510075110 A CN200510075110 A CN 200510075110A CN 1878129 A CN1878129 A CN 1878129A
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Abstract
The invention discloses a separating method of each station 2-layer business in the elastic group ring, which is characterized by the following: remodeling the transferring flow path for upper ring flow path of single-broadcast, group-broadcast, broadcast and flood of elastic group ring of butting station without changing lower ring flow path; converging the transferring of single-broadcast, group-broadcast, broadcast and flood to station only; proceeding group-broadcast register for Internet group management protocol bag in the elastic group ring for group-broadcast flow; discarding other group broadcast flow; realizing 2-layer separation among stations.
Description
Technical field
The present invention relates in the Resilient Packet Ring 2 layer services between each website, specifically, relate in a kind of Resilient Packet Ring the partition method of 2 layer services between each website.
Background technology
Resilient packet ring technology is an emerging technology; purpose be exactly set up have that bandwidth is reusable, each node has bandwidth usage that fair algorithm guarantees each node, have ring protection and QOS (service quality; Quality of Service) Resilient Packet Ring of ability, target are to insert looped network at key looped network in metropolitan area and metropolitan area.In December, 2000, IEEE set up the IEEE802.17 standard group specially, and purpose is exactly to formulate MAC (medium access control, Media AccessControl) the layer standard that can set up Resilient Packet Ring.This standard is passed through in June, 2004.In order to promote the formation of standard, manufacturers such as CISCO, NORTEL, Luminous initiate the non-commercial corporations of a Resilient Packet Ring alliance (Resilient Packet Ring Alliance) of foundation, purpose is the standardized process that promotes resilient packet ring technology, and Resilient Packet Ring alliance is the corporations that a unique family promotes the resilient packet ring technology development at present.
Resilient Packet Ring equipment provides elastic packet ring interface to be used for constructing elastic packet loop network in system side, provides the Ethernet interface of IEEE802.3 to be used for connecing the user at user side.An elastic packet loop network is made of 1 convergent point Resilient Packet Ring equipment and several access point Resilient Packet Ring equipment in the practical application, access point Resilient Packet Ring equipment can directly meet the end user or meet the end user by other equipment, as shown in Figure 1.Resilient Packet Ring equipment can be divided into route type Resilient Packet Ring equipment and bridge type Resilient Packet Ring equipment according to the pattern that it is realized.Be a bridge model between the elastic packet ring interface for its user side Ethernet interface of bridge type Resilient Packet Ring equipment and system side based on 2 layers of forwarding.In the elastic packet loop network that bridge type Resilient Packet Ring equipment constitutes, whole network is 2 layers of bridge coil that are made of several 2 layers of bridges, that is to say under the access point A equipment that the user that inserts can intercommunication on 2 layers with the user that access point B equipment inserts down.But in access layer network, if allow to pass through 2 layer intercommunications so between the user, the computer that the computer of user's first just can be seen user's second forms the leakage of information between the user easily on network.Therefore, can not pass through 2 layer network intercommunications between the user that operator wishes to insert, only allow the user who inserts to enter the last layer network by converging website, do 2 layers of isolation between the user who just wishes to insert, if these two users need communication, must do the IP route by 3 layers of equipment of upper layer network.For this reason, if elastic packet loop network uses as access layer network, just must realize that between the Resilient Packet Ring access station point 2 layers are isolated and the user-side port of Resilient Packet Ring equipment between isolation, wherein the latter has disclosed several different methods and can realize no longer description.
Summary of the invention
Technical problem to be solved by this invention provides in a kind of Resilient Packet Ring the partition method of 2 layer services between each website.Can not carry out 2 layer intercommunications by feasible the access between the website of this method, the access website only allows and converges website and carries out 2 layer intercommunications.Realize 2 layers of isolation between the Resilient Packet Ring access station point, avoided the leakage of information between the user.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
The partition method of 2 layer services between each website in a kind of Resilient Packet Ring, Resilient Packet Ring comprise that one is converged website and a plurality of access website, and described access website comprises a mac address table, comprises the steps:
Step 100: each website of configuration Resilient Packet Ring is for converging website or insert website, and disposes the described MAC Address that converges website in inserting website;
Step 200: traffic frame enters the Resilient Packet Ring system from the user side Ethernet interface;
Step 300 is judged the type of traffic frame, if unicast frame, execution in step 400 is handled; If broadcast frame, execution in step 600 is handled; If multicast frame, execution in step 700 is handled;
Step 400: the target MAC (Media Access Control) address of described traffic frame and the mac address table of described access website are mated, if the match is successful, execution in step 500, otherwise, execution in step 600;
Step 500: judge the type of site that described traffic frame enters, if converge website, execution in step 510 is if insert website, execution in step 520;
Step 510: carry out ring processing in the normal clean culture, finish;
Step 520: take out the MAC Address that mac address table mates the purpose Resilient Packet Ring website that obtains;
Step 530: judge whether target MAC (Media Access Control) address is consistent with the MAC Address that converges website, if consistent, execution in step 540, otherwise, execution in step 560;
Step 540: with converging the purpose website MAC Address of website MAC Address, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, constitutes the Frame of Resilient Packet Ring, and generate verification as the Resilient Packet Ring frame head;
Step 550:, finish with of the elastic packet ring interface output of described Frame from current access website;
Step 560: abandon described traffic frame, finish;
Step 600: judge the type of site that described traffic frame enters, if converge website, execution in step 610 is if insert website, execution in step 620;
Step 610: broadcast normally, ring is handled on the inundation, finish;
Step 620: with converging the purpose website MAC Address of website MAC Address as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is non-inundation frame, constitutes the Frame of Resilient Packet Ring, and generates verification;
Step 630:, finish with of the elastic packet ring interface output of described Frame from current access website;
Step 700: judge the type of site that described traffic frame enters, if converge website, execution in step 710 is if insert website, execution in step 720;
Step 710: carry out ring processing on the normal multicast, finish;
Step 720: extract the frame head of described traffic frame, judge the payload type in this frame head, if the IP bag, execution in step 730, otherwise, execution in step 760;
Step 730: judge the protocol type of described IP bag, if the Internet igmpinternet, execution in step 740, otherwise, execution in step 760;
Step 740: with the target MAC (Media Access Control) address of described traffic frame purpose website MAC Address as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is the inundation frame, constitutes the Frame of Resilient Packet Ring, and generates verification;
Step 750:, finish with of the elastic packet ring interface output of described Frame from current access website;
Step 760: abandon described traffic frame, finish.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, each website of the Resilient Packet Ring of configuration described in the described step 100 is that to converge website or insert website be pattern recognition preparation by the manual mode configuration site.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, described in the described step 100 in inserting website the described MAC Address that converges website of configuration be to converge website MAC Address configuration item by craft or signaling method configuration.
Between each website in the partition method of 2 layer services, traffic frame described in the described step 200 enters the Resilient Packet Ring system from the user side Ethernet interface and enters to insert website or converge website in a kind of Resilient Packet Ring of the present invention.
Between each website in the partition method of 2 layer services, judge described in the described step 300 that the type of traffic frame is to judge by the target MAC (Media Access Control) address of traffic frame in a kind of Resilient Packet Ring of the present invention.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, described in the described step 400 mac address table of the target MAC (Media Access Control) address of described traffic frame and described access website being mated is that target MAC (Media Access Control) address with traffic frame adds that VLAN ID removes to mate mac address table.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, judge described in the described step 500 that the type of site that described traffic frame enters judges by station mode sign configuration item.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, judge described in the described step 600 that the type of site that described traffic frame enters judges by station mode sign configuration item.
In a kind of Resilient Packet Ring of the present invention between each website in the partition method of 2 layer services, judge described in the described step 700 that the type of site that described traffic frame enters judges by station mode sign configuration item.
Between each website in the partition method of 2 layer services, the frame head that extracts described traffic frame described in the described step 720 is preceding 64 bytes of extracting traffic frame in a kind of Resilient Packet Ring of the present invention.
Compared with prior art, the invention has the advantages that:
Do corresponding forwarding process transformation by last circulation journey to clean culture, multicast, broadcasting and the inundation of the Resilient Packet Ring of access station point, following circulation journey is not done change, make the clean culture, broadcasting and the inundation stream that insert website to be transmitted to and converge website, multicast data flow then only allows to carry out IGMP (the Internet igmpinternet of multicast registration, Internet Group Management Protocol) bag enters Resilient Packet Ring and carries out multicast registration, and other multicast data flow then abandons.Then do not do transformation for converging website, converge website and can send unicast stream to any access website, the broadcasting, the inundation stream that converge website then send to all access websites, and multicast data flow then inserts the website multicast according to the multicast registration situation at each.Make to insert between the website and can not carry out 2 layers of communication, realized 2 layers of isolation between website.
Technical problem to be solved by this invention, technical scheme main points and beneficial effect will be in conjunction with the embodiments, be further described with reference to accompanying drawing.
Description of drawings
Fig. 1 is the RPR network schematic diagram.
Fig. 2 is a RPR network isolation processing block diagram of the present invention.
Fig. 3 is that ring is handled general flow chart in the present invention.
Fig. 4 is the ring clean culture process chart of going up of the present invention.
Fig. 5 is ring broadcasting, the inundation process chart gone up of the present invention.
Fig. 6 is the ring multicast process chart of going up of the present invention.
Embodiment
With reference to Fig. 2, be RPR network isolation processing block diagram of the present invention.
The present invention includes four parts: 1,2 stop point isolation configuration modules; 2, encircle the clean culture processing module on; 3, go up ring broadcasting, inundation processing module; 4, encircle the multicast processing module on.
In 2 stop point isolation configuration modules,, identify this website and still converge website for inserting website then by manual mode configuration site pattern identification configuration item; Wherein, for be configured to insert website also need converge website MAC Address configuration item by craft or signaling method configuration.
In last ring clean culture processing module, then be designated and insert website for station mode, this website is tabled look-up and is obtained purpose Resilient Packet Ring website MAC from carrying out MAC Address after the user side ethernet port receives unicast frame, the website MAC Address that converges of purpose Resilient Packet Ring website MAC Address and configuration is compared, if it is consistent, then ring is gone up from the output of Resilient Packet Ring loop interface in this traffic frame encapsulation back, if inconsistent, then abandons this traffic frame.
And, being designated for station mode and converging website, flow process do not do change.
In last ring broadcasting, inundation processing module, then be designated and insert website for station mode, this website receives broadcast frame from the user side ethernet port, perhaps receive unicast frame but carry out MAC Address and table look-up and do not find the clauses and subclauses that are complementary, need inundation to handle, then the website MAC Address that converges with configuration encapsulates this traffic frame as the purpose Resilient Packet Ring website MAC Address of this traffic frame, is designated non-inundation frame, goes up ring then and exports from the Resilient Packet Ring loop interface.
And, being designated for station mode and converging website, flow process do not do change.
In last ring multicast processing module, then be designated and insert website for station mode, after this website receives multicast frame from the user side ethernet port, the multicast frame head is carried out business diagnosis, if the protocol frame of IGMP then encapsulates this traffic frame with this multicast address as Resilient Packet Ring website MAC Address, and to identify this frame be the inundation frame, go up ring then from the output of Resilient Packet Ring loop interface, otherwise then abandon this multicast frame.
And, being designated for station mode and converging website, flow process do not do change.
With reference to Fig. 3, ring is handled general flow chart in the present invention.
The partition method of 2 layer services between each website in a kind of Resilient Packet Ring, Resilient Packet Ring comprise that one is converged website and a plurality of access website, and described access website comprises a mac address table,
Comprise the steps:
100, each website of configuration Resilient Packet Ring is for converging website or insert website, and disposes the described MAC Address that converges website in inserting website;
Here, each website of described configuration Resilient Packet Ring is that to converge website or insert website be pattern recognition preparation by the manual mode configuration site; Described in inserting website the described MAC Address that converges website of configuration then be to converge website MAC Address configuration item by craft or signaling method configuration.
200, traffic frame enters the Resilient Packet Ring system from the user side Ethernet interface;
That is, enter and insert website or converge website.
300, judge the type of traffic frame, if unicast frame, execution in step 400 is handled; If broadcast frame, execution in step 600 is handled; If multicast frame, execution in step 700 is handled;
Here, the type of judgement traffic frame is to judge by the target MAC (Media Access Control) address of traffic frame.
400, the target MAC (Media Access Control) address of described traffic frame and the mac address table of described access website are mated, if the match is successful, execution in step 500, otherwise, execution in step 600;
With reference to Fig. 4, the ring clean culture handling process that goes up of the present invention.
500, judge the type of site that described traffic frame enters, if converge website, execution in step 510 is if insert website, execution in step 520;
510, carry out ring processing in the normal clean culture, finish;
520, take out the MAC Address that mac address table mates the purpose Resilient Packet Ring website that obtains;
530, judge whether target MAC (Media Access Control) address is consistent with the MAC Address that converges website, if consistent, execution in step 540, otherwise, execution in step 560;
540, with converging the purpose website MAC Address of website MAC Address, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, constitutes the Frame of Resilient Packet Ring, and generate verification as the Resilient Packet Ring frame head;
550, with of the elastic packet ring interface output of described Frame, finish from current access website;
560, abandon described traffic frame, finish;
With reference to Fig. 5, ring broadcasting, the inundation handling process of going up of the present invention.
600, judge the type of site that described traffic frame enters, if converge website, execution in step 610 is if insert website, execution in step 620;
Here, the type of site that enters of the described traffic frame of described judgement is judged by station mode sign configuration item.
610, broadcast normally, ring is handled on the inundation, finish;
620, with converging the purpose website MAC Address of website MAC Address as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is non-inundation frame, constitutes the Frame of Resilient Packet Ring, and generates verification;
630, with of the elastic packet ring interface output of described Frame, finish from current access website;
With reference to Fig. 6, the ring multicast handling process that goes up of the present invention.
700, judge the type of site that described traffic frame enters, if converge website, execution in step 710 is if insert website, execution in step 720;
Here, the type of site that enters of the described traffic frame of described judgement is judged by station mode sign configuration item.
710, carry out ring processing on the normal multicast, finish;
720, extract the frame head of described traffic frame, judge the payload type in this frame head, if the IP bag, execution in step 730, otherwise, execution in step 760;
Here, the frame head of the described traffic frame of described extraction is preceding 64 bytes of extracting traffic frame, has comprised the payload type of traffic frame encapsulation.
730, judge the protocol type of described IP bag, if the IGMP agreement, execution in step 740, otherwise, execution in step 760;
740, with the target MAC (Media Access Control) address of described traffic frame purpose website MAC Address as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is the inundation frame, constitutes the Frame of Resilient Packet Ring, and generates verification;
750, with of the elastic packet ring interface output of described Frame, finish from current access website;
760, abandon described traffic frame, finish.
Method of the present invention is a kind of effectively at the method for 2 layers of isolation of Resilient Packet Ring website of resilient packet ring technology, makes to insert between the website by this method and can not carry out 2 layer intercommunications, inserts website and only allows and converge website and carry out 2 layer intercommunications.The technology of the present invention has been arranged,, still can't carry out 2 layers of communication between these end users even the end user of whole elastic packet loop network band is divided in the VLAN (VLAN, Virtual Local AreaNetwork).Operator can control communication between these end users by upper layer network.Transformation by the inventive method simultaneously, the broadcast traffic inundation flow of an access website can not insert website to other and impact, and the inundation flow can not be dealt into other access websites that should not receive this inundation frame, has effectively guaranteed to insert user's information security.
The partition method of 2 layer services between each website in a kind of Resilient Packet Ring of the present invention, be not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.
Claims (10)
1, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring is used to comprise a Resilient Packet Ring that converges website and a plurality of access websites, and described access website comprises a media access control layer address table, it is characterized in that comprising the steps:
(100) each website of configuration Resilient Packet Ring is for converging website or insert website, and disposes described media access control layer address of converging website in inserting website;
(200) traffic frame enters the Resilient Packet Ring system from the user side Ethernet interface;
(300) type of judgement traffic frame, if unicast frame, execution in step (400) is handled; If broadcast frame, execution in step (600) is handled; If multicast frame, execution in step (700) is handled;
(400) the purpose media access control layer address of described traffic frame and the media access control layer address table of described access website are mated, if the match is successful, execution in step (500), otherwise, execution in step (600);
(500) judge the type of site that described traffic frame enters, if converge website, execution in step (510) is if insert website, execution in step (520);
(510) carry out ring processing in the normal clean culture, finish;
(520) take out the media access control layer address that the media access control layer address table mates the purpose Resilient Packet Ring website that obtains;
(530) judge whether purpose media access control layer address is consistent with the media access control layer address of converging website, if consistent, execution in step (540), otherwise, execution in step (560);
(540) with converging the purpose website media access control layer address of website media access control layer address, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, constitutes the Frame of Resilient Packet Ring, and generate verification as the Resilient Packet Ring frame head;
(550) with of the elastic packet ring interface output of described Frame, finish from current access website;
(560) abandon described traffic frame, finish;
(600) judge the type of site that described traffic frame enters, if converge website, execution in step (610) is if insert website, execution in step (620);
(610) broadcast normally, ring is handled on the inundation, finish;
(620) with converging the purpose website media access control layer address of website media access control layer address as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is non-inundation frame, constitutes the Frame of Resilient Packet Ring, and generates verification;
(630) with of the elastic packet ring interface output of described Frame, finish from current access website;
(700) judge the type of site that described traffic frame enters, if converge website, execution in step (710) is if insert website, execution in step (720);
(710) carry out ring processing on the normal multicast, finish;
(720) frame head of the described traffic frame of extraction is judged the payload type in this frame head, if the IP bag, execution in step (730), otherwise, execution in step (760);
(730) judge the protocol type that described IP wraps, if the Internet igmpinternet, execution in step (740), otherwise, execution in step (760);
(740) with purpose website media access control layer address, the purpose media access control layer address of described traffic frame as the Resilient Packet Ring frame head, described traffic frame is encapsulated in the Resilient Packet Ring frame structure, identifying described traffic frame is the inundation frame, constitute the Frame of Resilient Packet Ring, and generate verification;
(750) with of the elastic packet ring interface output of described Frame, finish from current access website;
(760) abandon described traffic frame, finish.
2, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: each website of the Resilient Packet Ring of configuration described in the described step (100) is that to converge website or insert website be pattern recognition preparation by the manual mode configuration site.
3, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: described in the described step (100) in inserting website the described media access control layer address of converging website of configuration be to converge website media access control layer address configuration item by craft or signaling method configuration.
4, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: traffic frame described in the described step (200) enters the Resilient Packet Ring system from the user side Ethernet interface and enters to insert website or converge website.
5, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: the type of judging traffic frame described in the described step (300) is to judge by the purpose media access control layer address of traffic frame.
6, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: described in the described step (400) the media access control layer address table of the purpose media access control layer address of described traffic frame and described access website being mated is that purpose media access control layer address with traffic frame adds that VLAN ID removes to mate the media access control layer address table.
7, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: judge described in the described step (500) that the type of site that described traffic frame enters judges by station mode sign configuration item.
8, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: judge described in the described step (600) that the type of site that described traffic frame enters judges by station mode sign configuration item.
9, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: judge described in the described step (700) that the type of site that described traffic frame enters judges by station mode sign configuration item.
10, the partition method of 2 layer services between each website in a kind of Resilient Packet Ring according to claim 1 is characterized in that: the frame head that extracts described traffic frame described in the described step (720) is preceding 64 bytes of extracting traffic frame.
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| CNB2005100751105A CN100433710C (en) | 2005-06-08 | 2005-06-08 | Isolation method for two-layer service between websites in RPR |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242346B (en) * | 2007-02-06 | 2011-05-11 | 中兴通讯股份有限公司 | Method for mapping logic channel data to high-speed physical downlink share channel and transmitting it |
| CN102347881A (en) * | 2011-09-30 | 2012-02-08 | 华为技术有限公司 | Method and device for restoring unicast forwarding business flow during Ethernet ring failover |
| CN101741588B (en) * | 2008-11-14 | 2013-08-07 | ***通信集团公司 | Data storage system and method |
| CN103634186B (en) * | 2013-01-30 | 2017-02-08 | 深圳市禾望电气股份有限公司 | Ring-network serial communication method and system |
| CN110445703A (en) * | 2019-07-26 | 2019-11-12 | 新华三技术有限公司合肥分公司 | Loop message hold-up interception method, forwarding device and controller |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20012088A1 (en) * | 2001-10-10 | 2003-04-10 | Cit Alcatel | METHOD FOR PROPAGING FAULT INFORMATION IN A RPR NETWORK AND RELATED TYPE OF RPR PACKAGE |
| CN1223154C (en) * | 2002-08-29 | 2005-10-12 | 华为技术有限公司 | Method of sharing medium switch on control address on elastic growping looped network interface |
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2005
- 2005-06-08 CN CNB2005100751105A patent/CN100433710C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242346B (en) * | 2007-02-06 | 2011-05-11 | 中兴通讯股份有限公司 | Method for mapping logic channel data to high-speed physical downlink share channel and transmitting it |
| CN101741588B (en) * | 2008-11-14 | 2013-08-07 | ***通信集团公司 | Data storage system and method |
| CN102347881A (en) * | 2011-09-30 | 2012-02-08 | 华为技术有限公司 | Method and device for restoring unicast forwarding business flow during Ethernet ring failover |
| CN103634186B (en) * | 2013-01-30 | 2017-02-08 | 深圳市禾望电气股份有限公司 | Ring-network serial communication method and system |
| CN110445703A (en) * | 2019-07-26 | 2019-11-12 | 新华三技术有限公司合肥分公司 | Loop message hold-up interception method, forwarding device and controller |
| CN110445703B (en) * | 2019-07-26 | 2021-05-07 | 新华三技术有限公司合肥分公司 | Loop message intercepting method, forwarding equipment and controller |
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| Publication number | Publication date |
|---|---|
| CN100433710C (en) | 2008-11-12 |
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