JP2011023777A - Frame transmission band control system, and method of controlling frame transmission band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit OAM frames through the same transmission paths as those for user frames with respect to a system and a method of controlling frame transmission bands. <P>SOLUTION: In a system and a method for controlling frame transmission bands, a plurality of transmission devices are connected by a network, the transmission device complies with a contract transmission band corresponding to a user for transmission control of the user frame, and the OAM frame monitors normality in the transmission path of the user frame. An OAM determination section 1 identifies the user frame and the OAM frame for successively accumulating into a shaper cue. The user frame is successively sent from the shaper cue complying with the contract transmission band, and the user frame exceeding the contract transmission band is disposed. The user frame is transmitted only to the restricted contract transmission band. The OAM frame is successively sent from the shaper cue regardless of the contract transmission band, and includes a shaper 2 including a control means of performing transmission through the same transmission path as the user frame. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a frame transmission band control system and a frame transmission band control method that perform frame transmission within a contract transmission band corresponding to a user and can confirm the normality of a frame transmission path.

  In a system that performs frame transmission for a plurality of users, frame transmission control means is known that discards frames that exceed the contracted transmission band in order to guarantee frame transmission within the transmission band contracted in advance. There is also known a means for transmitting and receiving an OAM (Operation, Administration and Maintenance) frame for maintenance management so that the normality of the frame transmission path can be confirmed. Also known is a system in which a plurality of logical connections are formed on one physical line, each logical connection is identified by adding a VLAN (Virtual Local Area Network) tag to the frame, and the frame is transmitted in correspondence with the logical connection. ing. When transmitting / receiving an OAM frame corresponding to a logical connection, a VLAN tag corresponding to a logical connection requiring monitoring is added to each OAM frame.

  FIG. 4 is a schematic explanatory diagram of a communication carrier network, showing an outline when frame transmission is performed between a plurality of bases of users A, B, and C, and a logical connection corresponding to a plurality of users on each physical line. Is set, and frame transmission is performed by a logical connection indicated by a solid line between the bases 1 to 3 of the user A. For example, VID = 10 is added to the frame as a VLAN identifier, and a dotted line between the bases 1 to 3 of the user B For example, when VID = 20 is added to the frame as a VLAN identifier and frame transmission is performed by a logical connection indicated by a one-dot chain line between the bases 1 and 2 of the user C, for example, Even if the same physical line is used by adding VID = 30 as a VLAN identifier to the frame, Between the sites of connection correspondence of the user, without the interference condition, it is possible to perform frame transmission.

  FIG. 5 is an explanatory diagram of monitoring using an OAM frame. In a carrier network in which a plurality of transmission apparatuses are connected, transmission apparatuses as end apparatuses are connected by physical lines via a plurality of transmission apparatuses as intermediate apparatuses. The logical connection indicated by the solid line and the logical connection indicated by the dotted line are set on the physical line between the end devices, and VID = 10 is added to the frame as the VLAN identifier corresponding to the logical connection of the solid line, as described above. In a system in which VID = 20 is added to a frame as a VLAN identifier corresponding to a dotted logical connection, and a frame transmission corresponding to each logical connection is performed, an OAM frame is transmitted from one end device to another end device. When transmitting normality and monitoring normality, OAM frame corresponding to logical connection Similarly, VLAN identifiers with the same VID = 10 and VID = 20 are respectively added and transmitted from one end device, and the other end device receives and extracts an OAM frame corresponding to the VLAN identifier. The normality of the transmission path corresponding to the logical connection can be monitored.

  Further, a system is known in which a transmission band is contracted in advance when performing frame transmission corresponding to a user, and frame transmission within the contracted transmission band is guaranteed. In that case, a system is known in which a shaper for narrowing a transmission frame for a user to a contract transmission band is provided. For example, (A) and (B) in FIG. 6 show a shaper by a token bucket algorithm, and (A) in FIG. 6 shows a main part of the shaper for a single physical line or a single logical connection. The shaper queue 61, the selector 62, and the token bucket 63 are included, and the transmission frame is transmitted from the shaper queue 61 via the selector 62. In that case, when a token is supplied to the talk bucket 63 at a predetermined cycle corresponding to the contract transmission band and a frame is transmitted from the selector 62, the token corresponding to the frame length is subtracted from the token bucket 63, and the remaining token is When zero, frame transmission from the selector 62 is stopped. A frame overflowing from the shaper queue 61 due to a short frame arrival interval exceeds the contracted transmission band, and this overflowed frame is discarded. The token bucket 63 is normally composed of a counter, is composed of a counter that counts up a clock having a period corresponding to the contract transmission band, subtracts a count value corresponding to the data amount of the frame transmitted from the selector 62, and When becomes zero, the transmission of the frame from the selector 62 is stopped.

  FIG. 6B shows a main part in the case where transmission band control is performed by combining a shaper in units of logical connections and a shaper in units of physical ports. 64-1 to 64-n are respectively shown in FIG. A shaper for each logical connection having the configuration shown in (A), and 65 indicates a shaper for each physical port. The shaper queue for each logical connection is not shown. Frames to which VLAN identifiers in units of logical connections are added are controlled by the shapers 64-1 to 64-n so that the transmission band does not exceed the contracted transmission band, and further, the transmission band corresponding to the physical line is controlled by the shaper 65. As a result, frame transmission in the carrier network can be stabilized.

  In addition, a shaping process in a system in which user cells and OAM cells are mixedly transmitted in an ATM (Asynchronous Transfer Mode) network is known. When a leaky bucket algorithm is applied to the shaping process, reception is performed. The cells are temporarily stored in a memory corresponding to a shaper queue, and for user cells, the fluctuations in the arrival time interval are absorbed, and the memory is transmitted at predetermined time intervals so that the transmission time interval is within the contract transmission band. The cells that have arrived at such a short time interval that they cannot be transmitted at this predetermined time interval are discarded because they exceed the contract transmission bandwidth, and the OAM cell is identified and the user cell transmission time Proposed means to control so that it is transmitted within the interval and does not affect the contracted transmission band of the user cell (For example, refer to Patent Document 1).

  Also, in a system that relays IP packets in an IP network, it includes a queue and a shaper corresponding to the priority, and in order to prevent delay fluctuation, it adds and transmits delay information, There has been proposed a relay processing system that performs shaping processing based on priority and updates delay information added to an IP packet to internal processing delay information for transmission (see, for example, Patent Document 2). In addition, by integrating multiple physical lines and handling them as a single logical line, link aggregation enabling large capacity transmission is applied, and OAM frames with transmission timing information added are transmitted to each physical line, Proposed is a means for obtaining transmission delay information of each physical line based on the reception timing of the OAM frame, correcting the reception timing by the reception timing correction unit of the user frame, and sending the output timing to the output line in the order of the corrected reception timing. (For example, see Patent Document 3).

JP-A-8-79265 JP 2007-13654 A JP 2009-33573 A

  Transmission / reception of an OAM frame for monitoring the normality of a transmission line is generally performed between end-to-end transmission apparatuses among a plurality of transmission apparatuses connected to the transmission line. For example, as shown in FIG. If one end device inserts and transmits an OAM frame, and the other end device extracts the OAM frame and successfully receives the OAM frame, a transmission line between the end and end transmission devices Can be determined to be normal. In this case, when a plurality of logical connections are set on the physical line and frame transmission is performed corresponding to the logical connection, it is determined whether or not the transmission path corresponding to the logical connection is normal by transmitting / receiving an OAM frame corresponding to the logical connection. Judgment can be made. When transmitting an OAM frame corresponding to such a logical connection, for example, in FIG. 6B, when transmitting an OAM frame corresponding to a logical connection together with a user frame corresponding to a logical connection via a shaper, In the shapers 64-1 to 64-n corresponding to the logical connection, the OAM frame is also subjected to transmission band control as the same frame as the user frame, and there is a problem that the actual transmission band of the user frame cannot be secured. There is a possibility that discard processing by the shaper queue occurs for the OAM frame. In this way, when the OAM frame is discarded, the OAM frame is not transmitted to the end device side, so that there is a problem that the logical connection is erroneously determined as a failure. In addition, by providing a shaper for the user frame and a shaper for the OAM frame separately, it can be considered that the contracted transmission band of the user frame is not consumed by the OAM frame, but in that case, a transmission path different from the user frame is used. OAM frames are transmitted, and there is a problem that the reliability of the transmission path of user frames cannot be guaranteed.

  An object of the present invention is to solve the problems of the above-described conventional example, and enables transmission within a contract transmission band by shaping processing for a user frame, transmits an OAM frame on the same transmission path as the user frame, and The OAM frame provides a control system and a control method that perform control processing that does not consume the contracted transmission band and that can guarantee the reliability of the transmission path of the user frame.

  The frame transmission band control system of the present invention connects a plurality of transmission apparatuses via a network, performs transmission control of user frames by the transmission apparatus according to a contract transmission band corresponding to the user, and monitors the normality of the transmission path using an OAM frame. A frame transmission band control system for receiving and identifying user frames and OAM frames, sequentially storing them in a shaper queue, and sequentially transmitting user frames from the shaper queue according to a contract transmission band, and contract transmission A shaper having control means for discarding user frames exceeding the bandwidth and sequentially sending OAM frames from the shaper queue regardless of the contract transmission bandwidth is provided.

  In addition, the transmission device connected to the network identifies a plurality of logical connection-compatible user frames and OAM frames set on a physical line and stores them sequentially, and a logical connection-compatible shaper queue. Logical connection correspondence control means for sequentially sending user frames from the shaper queue corresponding to the logical connection according to the transmission band, discarding user frames exceeding the contracted band, and sending OAM frames from the shaper queue sequentially regardless of the contracted transmission band And a physical line correspondence control means for selectively sending out user frames and OAM frames from the logical connection correspondence control means according to the transmission bandwidth of the physical line.

  In addition, the shaper queue includes a control unit that sets a threshold for accumulating user frames and a threshold for OAM frames that are larger than the threshold, and discards user frames that exceed the threshold for user frames.

  In the frame transmission band control method of the present invention, a plurality of transmission apparatuses are connected by a network, the transmission of user frames is controlled by the transmission apparatus according to a contract transmission band corresponding to a user, and the normality of the transmission path is monitored by an OAM frame. A frame transmission bandwidth control method for receiving and identifying user frames and OAM frames via a network, sequentially storing user frames and OAM frames in a shaper queue, and user frames sequentially starting from the shaper queue according to a contracted transmission bandwidth A user frame that is transmitted and that exceeds the contracted transmission band is discarded, and the OAM frame includes a control process of sequentially transmitting from the shaper queue regardless of the contracted transmission band.

  Also, a plurality of user frames and OAM frames corresponding to a plurality of logical connections set on the physical line of the network are received and identified, and sequentially stored in a shaper queue corresponding to logical connections, according to a contract transmission band corresponding to logical connections. User frames are sequentially transmitted from the shaper queue corresponding to the logical connection, and user frames exceeding the contract bandwidth are discarded, OAM frames are sequentially transmitted from the shaper queue regardless of the contract transmission bandwidth, and the user is compatible with the logical connection. This includes a control process for selectively sending frames and OAM frames according to the transmission bandwidth of the physical line.

  It is possible to perform transmission band control according to the contract transmission band for user frames, and to transmit OAM frames through the same transmission path as user frames without performing transmission band control. There is an advantage that the reliability of the transmission path of the user frame can be guaranteed. Also, there is an advantage that the reliability of the transmission path corresponding to the logical connection can be ensured by transmitting the OAM frame to the plurality of logical connections through the same transmission path as the user frame.

It is explanatory drawing of Example 1 of this invention. It is processing explanatory drawing of the shaper of Example 1 of this invention. It is explanatory drawing of the shaper cue of Example 1 of this invention. It is an outline explanatory view of a communication carrier network. It is monitoring explanatory drawing by an OAM frame. It is explanatory drawing of the shaper function of a prior art example.

  The frame transmission band control system of the present invention connects a plurality of transmission apparatuses via a network, performs transmission control of user frames by the transmission apparatus according to a contract transmission band corresponding to the user, and normality of the transmission path of the user frame by OAM frames. The transmission apparatus receives and identifies user frames and OAM frames and sequentially stores them in the shaper queue, and sequentially transmits the user frames from the shaper queue according to the contracted transmission band. User frames that exceed the transmission band are discarded, user frames are limited to the contracted transmission band and transmitted, and OAM frames are sequentially sent out from the shaper queue regardless of the contracted transmission band and transmitted on the same transmission path as the user frame. A shaper having control means is provided.

  In the frame transmission band control method of the present invention, a plurality of transmission apparatuses are connected by a network, user frame transmission control by the transmission apparatus is performed according to a contract transmission band corresponding to a user, and the transmission path of a user frame is normal by an OAM frame. A frame transmission bandwidth control method for monitoring the performance of a user, and receiving and identifying user frames and OAM frames via a network, and sequentially storing the user frames and OAM frames in a shaper queue. A user frame that is sequentially transmitted from the queue and that exceeds the contract transmission band is discarded, and the OAM frame includes a control process in which the OAM frame is sequentially transmitted from the shaper queue regardless of the contract transmission band.

  FIG. 1 is an explanatory diagram of a first embodiment of the present invention, and shows a main part of a frame reception processing function of a user-side end device among a plurality of transmission devices connected to a network (not shown). 1 denotes an OAM determination unit, 2 denotes a shaper, 3 denotes a shaper band control unit, and 4 denotes an OAM extraction unit. The OAM determination unit 1 is connected to a physical line on the carrier network side (not shown), and has a function of identifying whether the received frame is an OAM frame or a user frame, and marks the OAM frame on the device header. And a function for clarifying the difference from the user frame. The shaper 2 includes functions such as a shaper queue corresponding to a logical connection and a determination of a write connection to the shaper queue by a logical connection of a received frame and a discard process of a user frame whose transmission band is over. The shaper bandwidth control unit 3 includes a shaper token management function and an output queue selection function. The shaper token management corresponds to, for example, the token bucket management control function shown in FIG. The output queue selection indicates a function of controlling frame transmission by selecting a shaper queue corresponding to a logical connection. The OAM extraction unit 4 includes a function for identifying and extracting the OAM frame marked on the in-device header by the OAM determination unit 1 and performing a termination process. It is sent to the terminal device of the connection compatible user.

  FIG. 2 is an explanatory diagram of the shaper according to the first embodiment of the present invention, showing the configuration of the shaper 2 of FIG. 1 and the main part of the control function. FIG. 2A is a user frame selection output process, and FIG. ) Shows an outline of OAM frame selection output processing. 11A and 11B, 11 is a shaper queue corresponding to the logical connection, 12 is a selector corresponding to the logical connection, 13 is a token bucket corresponding to the logical connection, 14 is a selector corresponding to the physical line, and 15 is The token bucket corresponding to a physical line is shown. The shaper queue 11, the selector 12, and the token bucket 13 are provided for logical connections, and user frames and OAM frames corresponding to the logical connections are accumulated in the shaper queue 11 according to the reception order. When a token is supplied at a speed according to the transmission band and a user frame is transmitted via the selector 12, the token is subtracted from the token bucket 13, and if the accumulated token is zero, the user frame is transmitted from the selector 12. Stop. However, as described above, since the OAM frame can be easily identified by marking the header to be a frame different from the user frame, the token from the token bucket 13 corresponding to the logical connection is not subtracted. And even if the stored token is zero.

  A token is supplied to the token bucket 15 corresponding to the physical line at a speed according to the transmission band corresponding to the physical line. When a user frame and an OAM frame are transmitted from the selector 14, the token is subtracted from the token bucket 15. . If the accumulation token is zero, the transmission of the user frame and OAM frame from the selector 14 is stopped. Therefore, the user frame corresponding to the logical connection and the OAM frame are transmitted through the same transmission path, and the contract transmission bandwidth corresponding to the logical connection is controlled only for the user frame. Processed as not subject to bandwidth control by logical connection.

  FIG. 3 is an explanatory diagram of the shaper queue according to the first embodiment of this invention, and shows a case where the accumulation threshold of the OAM frame is set higher than the accumulation threshold of the user frame corresponding to the logical connection. As a result, when the accumulated amount of user frames reaches the threshold, user frames that arrive after that are discarded, but since the accumulation threshold when OAM frames are included is set high, the OAM frames are discarded. Without being accumulated, and can be sequentially transmitted from the shaper queue. Thereby, the OAM frame is transmitted through the same transmission path as the transmission path of the user frame, and is not discarded, so that the contract transmission band of the user frame corresponding to the logical connection is not consumed by the OAM frame, The normality of the transmission path can be monitored.

DESCRIPTION OF SYMBOLS 1 OAM determination part 2 Shaper queue 3 Shaper bandwidth control part 4 OAM extraction part 11 Shaper queue 12 Selector 13 Token bucket 14 Selector 15 Token bucket

Claims (5)

In a frame transmission band control system in which a plurality of transmission apparatuses are connected by a network, user frame transmission control by the transmission apparatus is performed according to a contract transmission band corresponding to a user, and the normality of a transmission path is monitored by an OAM frame.
The transmission apparatus receives and identifies the user frame and the OAM frame, and sequentially stores them in a shaper queue. The user frames are sequentially transmitted from the shaper queue according to the contracted transmission band, and exceed the contracted transmission band. A frame transmission band control system comprising a shaper having control means for discarding a user frame and sequentially sending out the OAM frame from the shaper queue regardless of the contract transmission band.   The transmission apparatus connected to the network identifies a plurality of logical connection-compatible user frames and OAM frames set on a physical line and sequentially stores them, and a logical connection-compatible shaper queue. According to the contract transmission band, the user frames are sequentially transmitted from the shaper queue corresponding to the logical connection, the user frames exceeding the contract band are discarded, and the OAM frames are sequentially transmitted from the shaper queue regardless of the contract transmission band. A shaper including: a logical connection correspondence control means for sending; and a physical line correspondence control means for selectively sending out the user frame and the OAM frame from the logical connection correspondence control means according to the transmission bandwidth of the physical line. Claim characterized by 1 frame transmission band control system according.   The shaper queue includes control means for setting a threshold for accumulating the user frame and a threshold for the OAM frame greater than the threshold, and discarding a user frame exceeding the threshold for the user frame. The frame transmission band control system according to claim 1 or 2. In a frame transmission band control method for connecting a plurality of transmission apparatuses via a network, performing transmission control of user frames by the transmission apparatus according to a contract transmission band corresponding to a user, and monitoring normality of a transmission path using an OAM frame,
The user frame and the OAM frame are received and identified via the network, the user frame and the OAM frame are sequentially stored in a shaper queue, and the user frame is sequentially transmitted from the shaper queue according to the contracted transmission band. And a control process of discarding the user frame exceeding the contract transmission band and sequentially transmitting the OAM frame from the shaper queue regardless of the contract transmission band.   A plurality of user frames and OAM frames corresponding to a plurality of logical connections set on the physical line of the network are received and identified, sequentially stored in a shaper queue corresponding to the logical connections, and according to the contract transmission band corresponding to the logical connections. The user frames are sequentially transmitted from the shaper queue corresponding to the logical connection, and the user frames exceeding the contract bandwidth are discarded, and the OAM frames are sequentially transmitted from the shaper queue regardless of the contract transmission bandwidth, and 5. The frame transmission band control method according to claim 4, further comprising a control step of selectively transmitting the user frame and the OAM frame corresponding to the logical connection according to a transmission band of the physical line.

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