CN1968149A - Mac Ping initiation method and system - Google Patents
Mac Ping initiation method and system Download PDFInfo
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- CN1968149A CN1968149A CN 200610143786 CN200610143786A CN1968149A CN 1968149 A CN1968149 A CN 1968149A CN 200610143786 CN200610143786 CN 200610143786 CN 200610143786 A CN200610143786 A CN 200610143786A CN 1968149 A CN1968149 A CN 1968149A
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Abstract
The invention relates to a method for initializing Mac Ping and relative system, wherein it comprises that: network device via report in one virtual local network VLAN uses two-layer channel to initialize Mac Ping; the target network device receiving the report builds respond report to be transmitted or broadcast; the network device uses received time mark in respond report to confirm the network device. The invention simplifies the setting of Mac Ping and provides Mac Ping function.
Description
Technical field
The present invention relates to the fault management technology of network, relate in particular to the method and system of a kind of Mac of initiation Ping.
Background technology
Maintenance field MD (Maintenance Domain) is the involved network of 802.1ag fault management capability or certain part in the network, define by a series of territory Service Access Point DSAP (Domain ServiceAccess Point), maintenance field MD distinguishes by the MD name.Wherein Service Access Point DSAP in territory is the boundary point (as certain port of bridge device) of maintenance field, outside to the territory provides connectivity services, also may there be intermediary service access point ISAP (Intermediate Service AccessPoint) in maintenance field inside, and it is the intermediate node from a DSAP to another DSAP.
As shown in Figure 1, provided the example of a maintenance field, wherein had 5 bridge devices, the zone (grey color part) that 6 DSAP (a, b, c, d, e, f) cover is exactly a maintenance field, and there are a plurality of ISAP in the centre.
Can configure a plurality of Service Instances (as professional available DSAP) in the maintenance field as required at a certain user, a Service Instance is made up of a plurality of DSAP, and can identify by an ID, a Service Instance has total some attributes (as bandwidth).
The connectionless alliance that specifies a Service Instance also just to set up between those DSAP concerns, this relation is called Maintenance Association MA (Maintenance Association), the end points of Maintenance Association is called MEP (Maintenance Association End Point), the intermediate node of the Maintenance Association that relates to is called MIP (Maintenance Association Intermediate Point), MEP is positioned at corresponding D SAP place, and MIP is positioned at corresponding ISAP place.MA distinguishes by unique MA name in whole maintenance field, and the MA name is with safeguarding that domain name has formed the unique sign of Service Instance, and this sign need be carried in related news, to distinguish other Service Instance.
As shown in Figure 2, DSAP point a, c, e, f are configured to the DSAP that user C1 can use, thereby have set up a relevant Service Instance and the corresponding Maintenance Association MA of user C1, and two other DSAP b and d do not use, and do not belong to this Service Instance and MA.
As shown in Figure 3, the Maintenance Association MA from user C1 angle is seen is made of four DSAP nodes that belong to a Service Instance.
As shown in Figure 4,802.1ag ETHOAM (Operations, Administration andMaintenance of Ethernet, the Operations, Administration and Maintenance of Ethernet) fault recognition function (MacPing, carry out fault recognition according to the Mac address) realize by loopback message LBM (Loopback Message) message, LBM message is initiated by the MEP node, and the destination is exactly MEP or MIP.Middle MIP node just continues to transmit this message in network when confirming that purpose Mac is not oneself, if purpose MP (MEP or MIP) confirms that the purpose Mac of LBM message is oneself, this LBM message and structure loopback response LBR (Loopback Response) message then terminate.The MEP node of initiating the LBM message is received the flow process of finishing a whole fault recognition behind the legal LBR message.
Initiate the MEP node of Mac Ping, calculate parameters such as packet loss, time delay, delay variation according to the additional parameter that carries in the LBR message.
Based on the fault recognition function (Mac Ping) of IEEE 802.1AG, it mainly is to be limited in the scope of Maintenance Association to carry out Mac Ping, has only the MEP point can initiate Mac Ping, and the destination can be MIP or other MEP in same MA.
Existing Mac Ping function based on IEEE 802.1AG has limited the use of user for Mac Ping.
If operator for a double layer network, the attendant need be to initiating the other equipment of MacPing from an equipment, to confirm whether there is fault between the two or looks over current network state, when learning about parameters such as packet loss, time delay, delay variation, it need on every equipment all dispose MD, MA, the information such as MEP, MIP of IEEE 802.1AG protocol definition, relative complex and be inconvenient to use.
And, in the above-mentioned various management information of configuration, the situation that the user very likely mismatches, consequently connectedness is good between the in-house facility, on the contrary because the reason of configuration causes obstructed situation to occur.
Summary of the invention
At the problem that as above exists, the object of the present invention is to provide the method and system of a kind of Mac of initiation Ping, the inconvenience of user when using Mac Ping that causes with the administration configuration of avoiding IEEE 802.1ag agreement complexity.
To achieve these goals, technical scheme of the present invention is:
A kind of method of initiating Mac Ping comprises:
Network device via report is utilized in same virtual LAN VLAN and can be reached two layers of paths initiation MacPing.
Receive the purpose network equipment structure back message using of described message and transmit or broadcast.
The timestamp information that carries in the back message using that the network equipment utilization of initiation Mac Ping receives carries out the fault recognition of network.
A kind of system that initiates Mac Ping comprises:
Initiate the equipment of Mac Ping, be used in same virtual LAN VLAN, utilizing to reach two layers of paths initiation Mac Ping by message;
Destination device is used to receive the message that the equipment of initiating Mac Ping sends, and structure back message using and transmit or broadcast.
The equipment of described initiation Mac Ping also comprises:
Receiver module is used to receive described back message using;
The fault recognition module is used to utilize the timestamp information that carries in the back message using of this reception to carry out the fault recognition of network.
The present invention has simplified the configuration of Mac Ping, does not need to dispose complicated MD, MA, information such as MEP, MIP, can use two layers of Mac Ping, and therefore a kind of Ping of Mac more easily function is provided; In addition, the present invention has avoided under the administration configuration based on the complexity of IEEE 802.1ag agreement, the appearance of the obstructed phenomenon of network that causes by error configurations that causes, thus provide accurate in locating for the user.
Description of drawings
Fig. 1 is the schematic diagram of the maintenance field that operator's angle is seen in the prior art;
Fig. 2 is the schematic diagram of the Service Instance (or Maintenance Association) that operator's angle is seen in the prior art;
Fig. 3 is the schematic diagram of Service Instance (or Maintenance Association) among Fig. 2 that user perspective is seen in the prior art;
Fig. 4 is a fault recognition schematic diagram of the prior art;
Fig. 5 is the format chart of LBM and LBR message;
Fig. 6 is the fault recognition schematic diagram of system of the present invention;
Fig. 7 is the message format schematic diagram that has timestamp 1, timestamp 2, timestamp 3 and 4 four timestamps of timestamp.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in detail below in conjunction with accompanying drawing.
Embodiments of the invention are two-layer network device to be utilized in same virtual LAN VLAN by message can reach two layers of paths initiation Mac Ping.In same virtual LAN VLAN,, just can use Mac Ping function as long as there are two layers of path that can reach.Two layers of forwarding based on VLAN, use is more in Metro Ethernet (Metro Ethernet) network at present, and its advantage is that forwarding speed is fast, does not need the processing by upper-layer protocol.
Embodiments of the invention can reach two layers of paths initiation Mac Ping by utilizing in same virtual LAN VLAN, the Mac Ping function that breaks away from IEEE 802.1ag agreement is provided, the equipment of transmitting the degree of convenience of the fault location of user in double layer network will be greatly facilitated, as long as can use in same VLAN.
Describe specific embodiments of the invention below in detail.
The function of initiating Mac Ping in same VLAN of the present invention can realize based on LBM and the LBR message of IEEE 802.1ag.Its message format as shown in Figure 5.
Because adopted LBM and the LBR message format of IEEE802.1AG, can pass through the maintenance field MD of IEEE802.1AG smoothly in order to make message, then adopt limit priority for filling out 7 at the MD of message Level.
One, can carry out following handling process for the two-layer network device of initiating Mac Ping:
(1) at first construct the LBM message on port, the mode of filling in of corresponding each field domain is as follows during structure LBM:
1) Destination MAC address: the Mac address of filling in Mac Ping destination interface;
2) Source MAC address: fill in and initiate Mac Ping port Mac address;
3) 802.1Q or 802.1ad tag EtherType: Connectivity Fault Management (ConnectivityFault Management, CFM) the EthType type of message (comprising LBM and LBR message), not definition of temporary transient Draft;
4)802.1Q?or?802.1ad?tag：Vlan?ID；
5) MD Level: fill in 7;
6) Version: fill out 0, version is not checked in expression;
7) OpCode: fill in 3, expression LBM message;
8) Flags: fill out 0, this field is not checked in expression;
9) First TLV Offset: the deviant of filling in actual type lengths values (tlv);
10) Transaction Identifier/Sequence Number: initiate Mac Ping end since 1, LBM message of every transmission adds 1;
11) Optional LBM/LBR TLVs: carry Data TLV.
(2) after message is constructed, transmit according to Mac and to transmit,, then this LBM message is broadcasted in this VLAN if the Mac forwarding-table item does not exist.Initiate the network equipment of Mac Ping and when sending the LBM message, in the LBM message, stamp timestamp (timestamp 1).The form of LBM message and LBR message are roughly the same, and this timestamp can be beaten on the position of the timestamp 1 of as shown in Figure 7 message.
Two, carry out following handling process for the two-layer equipment that receives the LBM message:
(1) the purpose Mac address field of taking-up message, compare with the Mac address of the port, if it is inequality, then continue to walk original two layers of forwarding process, identical if (being the purpose network equipment) then take out the EthType (ethernet type) of message, if not the CFM message, then message is continued to walk original three layers of forwarding process, if CFM message, the expression message is legal, then stamp timestamp (being timestamp 2), and structure LBR message is responded in the position of the timestamp as shown in Figure 72 of the LBM message that receives.
Being constructed as follows of LBR message:
1) Destination MAC address: the Mac address, source (Source MACaddress) of inserting the LBM message;
2) Source MAC address: fill in the port Mac address;
3) the EthType type of 802.1Q or 802.1ad tag EtherType:CFM message, not definition of temporary transient Draft;
4)802.1Q?or?802.1ad?tag：Vlan?ID；
5) MD Level: fill in 7;
6) Version: fill out 0;
7) OpCode: fill in 3;
8) Flags: fill out 0;
9) First TLV Offset: the deviant of filling in actual TLV;
10) Transaction Ident ifier/Sequence Number: the Transact ion Identifier/Sequence Number territory of inserting the LBM message;
11) Optional LBM/LBR TLVs: the TLV exact copy of LBM message is arrived this.
(2) after message is constructed, transmit according to Mac and to transmit,, then this LBR message is broadcasted in this VLAN if the Mac forwarding-table item does not exist.Timestamp (timestamp 3) is stamped in purpose network equipment position at as shown in Figure 7 timestamp 3 when sending the LBR message.
Three, the two-layer equipment that receives the LBR message can carry out following processing:
(1) the purpose Mac address field of taking-up message, compare with the Mac address of the port, if it is inequality, then continue to walk original two layers of forwarding process, if it is identical then take out the EthType of message, if not the CFM message, then message is continued to walk original three layers of forwarding process, if CFM message, then this equipment that receives the initiation Mac Ping of LBR message is stamped timestamp (timestamp 4) on the position of the timestamp as shown in Figure 74 of the LBR message that receives, and proceeds the judgement of Mac Ping.
(2) take out the LBR sequence number of message and local LBM sequence number of message of preserving compares, if identical then represent legal message, if inequality then represent invalid packet.Stamp timestamp 4 on the position of the timestamp 4 of the LBR message that also can after the judgement message is legal, receive again in the present embodiment.
(3) if the legal LBR message of identical expression, then take-off time stabs, and calculates parameters such as frame loss rate, time delay, shake according to computing formula.
The form that has the LBR message of timestamp 1, timestamp 2, timestamp 3 and 4 four timestamps of timestamp can be referring to Fig. 7.The time that the corresponding time-write interval stabs: when initiating Ping bridge device end (can be described as the A end) transmission LBM message, stamp timestamp in the position of timestamp 1.Ping purpose bridge device end (can claim the B end) receives the legal back of LBM judgement and stamps timestamp in the position of timestamp 2, respond the LBR message, above-mentioned two field exact copy of LBM message in the LBR message, are sent the LBR message and go out equipment, stamp timestamp in the position of timestamp 3.After receiving the LBR message, the A end stamps timestamp in the position of timestamp 4.According to above-mentioned 4 timestamps that contain in the LBR message shown in Figure 7 that obtains at last, just can calculation delay, parameter such as shake.
LOF (Frame Loss:FL): refer to up UNI (User Network Interface: User to NetworkInterface) send the different of number of frames and descending UNI received frame quantity;
Frame time delay (Frame Delay:FD): comprise loopback delay and One Way Delay, loopback delay refers to that transmitting terminal sends first bit of Frame and time interval of receiving last bit of looping back data frame, and One Way Delay refers to that the transmitting terminal data send the interval of time and receiving terminal Data Receiving time;
Frame delay variation parameter (FDV): with a kind of time delay situation of change of COS business data frame.
Present embodiment utilizes following formula to calculate parameters such as frame loss rate, time delay, shake:
1) frame loss rate=| CT2-CT1|-|CR2-CR1|, wherein CT represents the correct OAM (Operations that sends of up UNI, Administration and Maintenance: frame number Operations, Administration and Maintenance), CR are represented the OAM frame number that descending UNI correctly receives; | CT2-CT1| represents the Operations, Administration and Maintenance OAM frame number that up User Network Interface sends in a period of time; | CR2-CR1| represents the Operations, Administration and Maintenance OAM frame number that the downlink user network interface is received in this section period.This Several Parameters is the data of taking out from driving.
2) time delay=(| timestamp 4-timestamp 1|-| timestamp 3-timestamp 2|)/2.Wherein timestamp 1 expression is the timestamp that the equipment of initiating Mac Ping is stamped when sending message; The timestamp 2 expression purpose network equipments receive the timestamp of stamping behind the message that Mac Ping initiating equipment sends; The timestamp of stamping when the timestamp 3 expression purpose network equipments send back message using; The equipment that Mac Ping is initiated in timestamp 4 expressions receives the timestamp of stamping behind the back message using.
3) Dou Dong computational methods: calculate one group of time delay, the difference according to a back time delay and previous time delay draws jitter parameter.Such as: time delay 1, time delay 2, time delay 3, time delay 4 expressions are by one group of continuous before and after time time delay;
Average jitter=[(time delay 2-time delay 1)+(time delay 3-time delay 2)+(time delay 4-time delay 3)]/3 then.
Also there are other modification that is easy to realize and equivalents in the computing formula of the frame loss rate that the present invention is not limited to as above provide, time delay, jitter parameter.
As above as seen, the method for the initiation Mac Ping of present embodiment has been simplified the configuration of Mac Ping, does not need to dispose complicated MD, MA, information such as MEP, MIP and can use two layers of Mac Ping.
The present invention that above embodiment is based on the LBM of IEEE 802.1ag and LBR message initiates the realization of Mac Ping function in same VLAN, but the present invention is to message format and unrestricted, can also adopt other multiple message formats, it is the message that the present invention can adopt extended formatting fully, as long as in message, put down in writing timestamp 1 as above, timestamp 2, timestamp 3 and timestamp 4, just can be implemented in the Mac Ping that can reach two layers of path in the same VLAN equally, thereby can check network state, realize the affirmation of network failure.
Realize as above system's (see figure 6) of the initiation Mac Ping of embodiment, comprising:
Initiate the equipment (or claiming to initiate Ping bridge device end) of Mac Ping, be used in same virtual LAN VLAN, utilizing to reach two layers of paths initiation Mac Ping by message;
Destination device (or claiming Ping purpose bridge device end) is used to receive the message that the equipment of initiating Mac Ping sends, and structure back message using and transmit or broadcast.
The equipment of described initiation Mac Ping also comprises: receiver module is used to receive described back message using; The fault recognition module is used to calculate frame loss rate, and utilizes parameters such as the timestamp information computing network time delay of carrying in the back message using of this reception, shake, to carry out the fault recognition of network.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.Within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. method of initiating Mac Ping is characterized in that:
Network device via report is utilized in same virtual LAN VLAN and can be reached two layers of paths initiation MacPing.
2. method according to claim 1 is characterized in that also comprising:
Receive the purpose network equipment structure back message using of described message and transmit or broadcast.
3. method according to claim 2 is characterized in that also comprising:
The timestamp information that carries in the back message using that the network equipment utilization of initiation Mac Ping receives carries out the fault recognition of network.
4. method according to claim 1 is characterized in that:
The message that the network equipment of initiation Mac Ping sends is transmitted according to Mac and is transmitted or broadcast in this VLAN.
5. method according to claim 2 is characterized in that:
The back message using of described purpose network equipment structure is transmitted according to Mac and is transmitted or broadcast in this VLAN.
6. according to claim 2 or 3 described methods, it is characterized in that:
The message that the network equipment of initiation Mac Ping sends is loopback message LBM;
Described back message using is loopback back message using LBR.
7. method according to claim 6 is characterized in that:
After the equipment of initiation Mac Ping receives back message using, taking out the Mac address of message and the Mac address of the port compares, if identical, then judge and the ethernet type of message then carry out three layers of forwarding of message if not Connectivity Fault Management CFM type of message; If the CFM type of message judges then whether the message that is received is legal; If the message that receives is legal, then utilize timestamp to carry out fault recognition.
8. method according to claim 3 is characterized in that:
The fault recognition that the timestamp information that carries in the message that described utilization receives carries out network comprises: take out timestamp, the time delay of computing network and/or the delay variation parameter of carrying in the message that receives.
9. method according to claim 1 is characterized in that:
The network equipment of initiating Mac Ping utilizes the frame loss rate of following formula computing network:
Frame loss rate=| CT2-CT1|-|CR2-CR1|, wherein CT represents the correct Operations, Administration and Maintenance OAM frame number that sends of up User Network Interface UNI, CR represents the Operations, Administration and Maintenance OAM frame number that downlink user network interface UNI correctly receives; | CT2-CT1| represents the Operations, Administration and Maintenance OAM frame number that up User Network Interface sends in a period of time; | CR2-CR1| represents the Operations, Administration and Maintenance OAM frame number that the downlink user network interface is received in this section period.
10. method according to claim 8 is characterized in that:
Following formula is satisfied in the calculating of described network delay:
Time delay=(| timestamp 4-timestamp 1|-| timestamp 3-timestamp 2|)/2; Wherein timestamp 1 expression is the timestamp that the equipment of initiating Mac Ping is stamped when sending message; The timestamp 2 expression purpose network equipments receive the timestamp of stamping behind the message that Mac Ping initiating equipment sends; The timestamp of stamping when the timestamp 3 expression purpose network equipments send back message using; The equipment that Mac Ping is initiated in timestamp 4 expressions receives the timestamp of stamping behind the back message using.
11. method according to claim 10 is characterized in that:
Following formula is satisfied in the calculating of described delay variation:
Average jitter=[(time delay 2-time delay 1)+(time delay 3-time delay 2)+(time delay 4-time delay 3)]/3, wherein time delay 1, time delay 2, time delay 3, time delay 4 are represented respectively by one group of continuous before and after time time delay.
12. a system that initiates Mac Ping is characterized in that comprising:
Initiate the equipment of Mac Ping, be used in same virtual LAN VLAN, utilizing to reach two layers of paths initiation Mac Ping by message;
Destination device is used to receive the message that the equipment of initiating Mac Ping sends, and structure back message using and transmit or broadcast.
13. system according to claim 12 is characterized in that the equipment of described initiation Mac Ping also comprises:
Receiver module is used to receive described back message using;
The fault recognition module is used to utilize the timestamp information that carries in the back message using of this reception to carry out the fault recognition of network.
14. system according to claim 13 is characterized in that:
The described fault recognition that utilizes the timestamp information that carries in the back message using to carry out network comprises: take out timestamp, the time delay of computing network and/or the delay variation parameter of carrying in the back message using that receives.
15. system according to claim 13 is characterized in that:
Described fault recognition module also is used to utilize the frame loss rate of following formula computing network:
Frame loss rate=| CT2-CT1|-|CR2-CR1|, wherein CT represents the correct Operations, Administration and Maintenance OAM frame number that sends of up User Network Interface UNI, CR represents the Operations, Administration and Maintenance OAM frame number that downlink user network interface UNI correctly receives; | CT2-CT1| represents the Operations, Administration and Maintenance OAM frame number that up User Network Interface sends in a period of time; | CR2-CR1| represents the Operations, Administration and Maintenance OAM frame number that the downlink user network interface is received in this section period.
16. system according to claim 14 is characterized in that:
Following formula is satisfied in the calculating of described network delay:
Time delay=(| timestamp 4-timestamp 1|-| timestamp 3-timestamp 2|)/2; Wherein timestamp 1 expression is the timestamp that the equipment of initiating Mac Ping is stamped when sending message; The timestamp 2 expression purpose network equipments receive the timestamp of stamping behind the message that Mac Ping initiating equipment sends; The timestamp of stamping when the timestamp 3 expression purpose network equipments send back message using; The equipment that Mac Ping is initiated in timestamp 4 expressions receives the timestamp of stamping behind the back message using.
17. system according to claim 16 is characterized in that:
Following formula is satisfied in the calculating of described delay variation:
Average jitter=[(time delay 2-time delay 1)+(time delay 3-time delay 2)+(time delay 4-time delay 3)]/3, wherein time delay 1, time delay 2, time delay 3, time delay 4 are represented respectively by one group of continuous before and after time time delay.
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| CNB2006101437868A CN100488124C (en) | 2006-11-06 | 2006-11-06 | Mac Ping initiation method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011063714A1 (en) * | 2009-11-27 | 2011-06-03 | 华为技术有限公司 | Method, device and system for measuring asymmetric time delay of communication paths |
| CN101325522B (en) * | 2008-08-01 | 2011-08-24 | 中国电信股份有限公司 | Method and system for detecting end-to-end connectivity of telecommunication grade ether private wire |
| CN102821047A (en) * | 2012-07-30 | 2012-12-12 | 华为技术有限公司 | Method, network apparatus and system for establishing corresponding relation in networks |
| CN109428816A (en) * | 2017-08-28 | 2019-03-05 | 中国电信股份有限公司 | Link protection method, device and storage medium |
| CN113381946A (en) * | 2021-05-25 | 2021-09-10 | 湖南恒茂高科股份有限公司 | Router outlet message priority promotion method, router and communication system |
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2006
- 2006-11-06 CN CNB2006101437868A patent/CN100488124C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325522B (en) * | 2008-08-01 | 2011-08-24 | 中国电信股份有限公司 | Method and system for detecting end-to-end connectivity of telecommunication grade ether private wire |
| WO2011063714A1 (en) * | 2009-11-27 | 2011-06-03 | 华为技术有限公司 | Method, device and system for measuring asymmetric time delay of communication paths |
| EP2458787A1 (en) * | 2009-11-27 | 2012-05-30 | Huawei Technologies Co., Ltd. | Method, device and system for measuring asymmetric time delay of communication paths |
| US8750356B2 (en) | 2009-11-27 | 2014-06-10 | Huawei Technologies Co., Ltd. | Method, apparatus, and system for measuring asymmetric delay of communication path |
| CN102821047A (en) * | 2012-07-30 | 2012-12-12 | 华为技术有限公司 | Method, network apparatus and system for establishing corresponding relation in networks |
| CN102821047B (en) * | 2012-07-30 | 2015-06-03 | 华为技术有限公司 | Method, network apparatus and system for establishing corresponding relation in networks |
| CN109428816A (en) * | 2017-08-28 | 2019-03-05 | 中国电信股份有限公司 | Link protection method, device and storage medium |
| CN113381946A (en) * | 2021-05-25 | 2021-09-10 | 湖南恒茂高科股份有限公司 | Router outlet message priority promotion method, router and communication system |
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| CN100488124C (en) | 2009-05-13 |
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Effective date of registration: 20181128 Address after: 057750 No. 01, No. 173 Qianluotou Village, Chaibu Town, Guantao County, Handan City, Hebei Province Patentee after: Xue Pilin Address before: 519031 Building 2-I, No. 5, Hengqin Financial Industry Service Base, Zhuhai City, Guangdong Province Patentee before: The International Intellectual Property Trading Center Co. Ltd. |