KR20100026721A - Apparatus and method for providing network interface information in stream control transmission protocol - Google Patents

Abstract

PURPOSE: A network interface information providing device in stream control transmission protocol and a method thereof are provided to a network interface in which an error is generated. CONSTITUTION: An address management unit(203) establishes a ranking number of addresses connected to an object node. The address management unit confirms connection states of the addresses. The address management unit generates an SCTP packet including information showing connection states of the confirmed addresses. A control unit(201) transmits the SCTP packet generated by the address management unit to the object node.

Description

Apparatus and method for providing network interface information of ssTPP {APPARATUS AND METHOD FOR PROVIDING NETWORK INTERFACE INFORMATION IN STREAM CONTROL TRANSMISSION PROTOCOL}

The present invention relates to a stream resource management system and method of the SCTP (Stream Control Transmission Protocol), which is an IP-based signaling protocol. In particular, the present invention relates to a case in which two or more physical paths exist between two hosts connected using SCTP. By transmitting the status information of the network interface by using the padding of the SCTP packet, it is possible to quickly recognize the network interface failure of the other node without generating additional traffic, and the unnecessary connection path check process An apparatus and method are provided for reducing latency and resource consumption.

Stream Control Transmission Protocol (SCTP) is a transport protocol proposed by the IETF SIGTRAN Working Group as standard in October 2000 (RFC 2960) for transmitting signaling messages used in PSTN networks over IP networks in the Internet. . In addition, SCTP is a connection-oriented protocol such as TCP running on the IP layer that enables reliable data transfer and is safe from DOS attacks and masquerading attacks that may occur during association control. It is designed. In addition, SCTP has a multi-streaming function, which solves the performance degradation problem caused by TCP's Head Of Line Blocking. In particular, SCTP-connected terminals can have multiple IP addresses. In the case of (Multi-Homed), even if a path failure occurs in the primary path by adjusting a plurality of communication paths, data can be transferred (multi-homing function) to another controlled communication path in advance. The reliability of the transmission can be improved.

1 is a diagram showing the configuration of a typical SCTP packet.

Referring to FIG. 1, the SCTP packet 100 is divided into a common header 101, chunks 102, and 103. The common header 101 includes a 16-bit outgoing port number 111 and a 16-bit receiving port number 112, and has a 32-bit verification tag field capable of uniquely identifying terminals whose association is controlled. Field 113, and there is a Checksum Field 114 to check the integrity and consistency of SCTP packets. Chunks 102 and 103 are located after the common header 101. The chunks 102 and 103 are control chunks and data for connection control, release, and error transmission of SCTP. Data chunks for transmission, Sack chunks for response, and the like.

In the configuration of the chunk, an 8-bit chunk type 121 is determined according to the type of the chunk, and an 8-bit flag 122 is set for detailed settings. The 16 bit chunk length 123 represents the chunk length in bytes, including the form 121, the flag 122, and the chunk value 124. The chunk value 124 includes information to be delivered using the chunk. The total length of the chunk should always be a multiple of 4 bytes, and if it is not a multiple of 4 bytes, padding is used to make the entire length a multiple of 4 bytes. According to the chunk configuration shown in Figure 4., there is no padding if the lower two bits of the chunk length field are "00", 3 bytes for "01", 2 bytes for "10", In case of "11", one-byte padding appears.

In addition, the SCTP periodically generates a heartbeat chunk (Heartbeat Chunk) and checks the link state of the end-to-end terminal to the partner node. The counterpart node receiving the heartbeat chunk sends a heartbeat ACK to notify normal reception. At this time, the used heartbeat interval (Heartbeat Interval) is generally recommended 30sec.

However, SCTP path management performs failure determination in the same way for not only the path failure but also the physical failure of the receiving network interface. Therefore, the conventional SCTP path management does not recognize the failure state even when the network interface of the counterpart node fails. Therefore, the path checking process is performed through the heartbeat chunk, and the timer is driven while waiting for the HEARTBEAT-ACK chunk response. Should be. As a result, unnecessary traffic occurs until the path failure is recognized, excessive time delay occurs, and resource consumption occurs due to timer operation.

The present invention was derived to solve the above problems, and an object of the present invention is to provide an apparatus and method for identifying a network interface that has a failure in SCTP.

Another object of the present invention is to provide an apparatus and method for generating information indicating a connection state of a network interface in SCTP.

It is still another object of the present invention to provide an apparatus and method for including information indicating a network interface connection state in SCTP in an SCTP packet.

Another object of the present invention is to transmit the connection state information of the network interface in SCTP to quickly recognize the network interface failure of the other node without generating additional traffic, and to reduce the latency and resource consumption due to unnecessary connection path check process To provide an apparatus and method for.

According to a first aspect of the present invention for achieving the above objects, the SCTP stream management apparatus for generating connection status information of a network interface sets a number indicating a rank with respect to addresses connected to a partner node, the connection of the addresses And an address manager for generating an SCTP packet including information indicating the connection status of the checked addresses, and a controller configured to transmit the SCTP packet generated by the address manager to the counterpart node. It is done.

According to a second aspect of the present invention for achieving the above objects, the SCTP stream management apparatus for checking the connection state of the network interface, when receiving the SCTP packet from the partner node, by analyzing the received packet of the partner node And an address management unit for checking an address connection state, and a control unit for checking the address connection state information confirmed by the address management unit to transmit the heartbeat chunk to all addresses except for the failed address.

According to a third aspect of the present invention for achieving the above objects, a method of generating connection state information of a network interface in an SCTP stream management apparatus includes: setting a number indicating a rank for addresses connected to a counterpart node; Checking a connection state of the addresses, generating a SCTP packet including information indicating the connection state of the checked addresses, and transmitting the generated SCTP packet to the counterpart node. do.

According to a fourth aspect of the present invention for achieving the above objects, a method for confirming a connection state of a network interface in an SCTP stream management apparatus, when receiving a SCTP packet from a partner node, by analyzing the received packet Checking the address connection status of the node, updating and storing the checked address connection status information, and transmitting the heartbeat chunk to all addresses except the failed address by checking the address connection status information. Characterized in that.

As described above, the present invention transmits connection state information of a network interface in SCTP to quickly recognize a network interface failure of a partner node without generating additional traffic, and to reduce latency and resource consumption due to unnecessary connection path checking process. In order to generate the information indicating the connection state of the network interface in the SCTP to include in the SCTP packet and transmit the information, when receiving the information, by identifying the network interface of the failure, the network interface of the other node without generating additional traffic You can quickly recognize failures and reduce latency and resource consumption due to unnecessary connection path resolution.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the following description, an apparatus and method for quickly recognizing a network interface failure of a partner node without generating additional traffic by transmitting connection state information of a network interface in SCTP, and reducing latency and resource consumption due to unnecessary connection path checking process Will be explained.

2 is a block diagram illustrating a configuration of an SCTP stream management apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the SCTP stream management apparatus may include a control unit 201, an address management unit 203, a storage unit 205, and a communication unit 207.

The control unit 201 of the SCTP stream management device controls an operation for transmitting state information of a network interface in a multi-homing environment of a stream control transmission protocol (SCTP). In other words, the controller is configured to transmit status information of a network interface by using padding of an SCTP packet when two or more physical paths exist between two hosts that are connected using the SCTP. By processing it, it is possible to quickly recognize the network interface failure of the other node without generating additional traffic, and reduce the waiting time and resource consumption due to unnecessary connection path checking process.

At this time, the control unit 201 checks the path corresponding to the list of addresses exchanged during the SCTP connection process, and pads to 8-bit information of the field indicating the length of the SCTP packet, that is, the connection state of the address connected to the partner node, that is, the interface Process to generate an SCTP packet including information indicating the connection status of the address in order to provide an error occurrence to the counterpart node.

The address manager 203 checks the path corresponding to the address list exchanged in the SCTP connection process by receiving the instruction from the controller 201 and pads the 8-bit information indicating the length of the SCTP packet with the counterpart node. Generates information indicating the connection status of the connected address.

For example, when the address manager 203 confirms that all addresses (network interfaces) of the device are operating normally, all the 8-bit information in the field indicating the length of the SCTP packet is padded with "0". If it is confirmed that a specific address among all the addresses (network interface) of the device fails, the upper 2 bits of the field indicating the length of the SCTP packet are set to "10", and the lower 6 bits of the number of the failed address ( Padding that records the number corresponding to the address used by the network interface.

In addition, when the address manager 203 determines that the failure of the corresponding address is recovered after the failure of the address of the device, the upper two bits of the field indicating the length of the SCTP packet are set to "01", and the lower six bits. In the padding that records the number of the address where the failure has been recovered, and if only the address (network interface) that transmits the current packet among all the addresses (network interface) of the device operates normally, the upper part of the field indicating the length of the SCTP packet Set 2 bits to "11" and pad the lower 6 bits with "0".

The storage unit 205 stores address connection state information indicating information in which the address connection state of the counterpart node is summarized. Accordingly, the SCTP stream management apparatus transmits the heartbeat chunk to all addresses except for the failed address using the address connection state information.

The communication unit 207 transmits a message for the SCTP connection to the counterpart node and receives a message from the counterpart node and according to the present invention, a connection state of an address connected to the counterpart node according to an interface management process, that is, an error of an interface. In order to provide the presence or absence to the counterpart node, an SCTP packet including information indicating a connection state of the corresponding address may be transmitted or the SCTP packet may be received from the counterpart node.

The role of the address management unit 203 may be performed by the control unit 201 of the SCTP stream management device, but in the present invention, the configuration of the address management unit 203 is an exemplary configuration for convenience of explanation and never the scope of the present invention. It should be understood that various modifications may be made within the scope of the present invention by those skilled in the art. For example, the controller 201 may be configured to process all of them.

The above describes a device for transmitting network connection status information in SCTP to quickly recognize a network interface failure of a partner node without generating additional traffic, and to reduce latency and resource consumption due to unnecessary connection path checking process. In the following description, a method for quickly recognizing a network interface failure of a counterpart node using the apparatus according to the present invention and reducing a waiting time and resource consumption due to an unnecessary connection path checking process will be described.

3 is a flowchart illustrating a process of generating connection state information of a network interface in an SCTP stream management apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the SCTP stream management apparatus first performs an address management process of managing a list of addresses exchanged in an SCTP connection establishment step, that is, a rank of a plurality of paths, in step 301.

In order to perform the address management process, the SCTP stream management apparatus checks the address list exchanged in the SCTP connection process in step 303 and then proceeds to step 305 to set a number in the checked address list. do. Here, setting the number in the address list sets information indicating an address where an error occurs (the path where an error occurred), so that the address where the error occurs can be notified by passing the number of the address where the error occurred to the counterpart node. . In addition, the list of addresses exchanged during the SCTP connection process is based on the send and receive addresses recorded in the connection establishment request message (INIT_Chunk) or the connection establishment request response message (INIT-ACK_Chunk) for establishing a connection between specific nodes in a typical SCTP. As a list, the SCTP stream management apparatus may be set to assign a sequential number according to the list recording order of the address. At this time, the SCTP stream management apparatus sets the first recorded address to "0", increases the number by "1", assigns a number to each address, and also registers the addresses registered through the dynamic address reset function in order. To give. However, even if there is an address deleted through the dynamic address reset function, the address list after the number corresponding to the deleted address is not reset. In this case, since the SCTP stream management apparatus may use 6 bits for the address number, up to 64 addresses may be managed.

Thereafter, the SCTP stream management apparatus proceeds to step 307 to perform an interface management process. In this case, the interface management process refers to a process of generating information indicating a connection state of an address in order to provide a connection state of an address connected to a counterpart node, that is, an error occurrence of an interface to the counterpart node.

In order to perform the interface management process as described above, the SCTP stream management apparatus proceeds to step 309 and checks the connection state of the address notified to the counterpart node in the SCTP connection process, and then proceeds to step 311 to determine the connection state of the checked address. Create a corresponding STCP packet. Here, the SCTP packet includes information indicating whether all of the checked addresses operate normally or whether a failure occurs in the corresponding address or a failure of the corresponding address is recovered.

In this case, the SCTP stream management apparatus may generate the SCTP packet including the above information by padding the padding setting information defined as shown in Table 1 below to 8-bit information of a field indicating the length of the SCTP packet.

Top 2 bits Setting contents Lower 6 bit information 00 All addresses work fine Set all to "0" 01 Failover at Specific Addresses Corresponding address number 10 Failure of specific address Fault address number 11 Only current address works normally Set all to "0"

That is, when confirming that all addresses (network interfaces) of the device are operating normally, the SCTP stream management apparatus pads all the 8-bit information of the field indicating the length of the SCTP packet with "0".

If the SCTP stream management apparatus determines that a failure occurs in a specific address among all addresses (network interfaces) of the apparatus, the upper two bits of the field indicating the length of the SCTP packet are set to "10", and the lower six The padding is written with the number of the address where the bit failed (the number corresponding to the address used by the network interface). For example, if it is confirmed that a failure occurs at address 2 and address 19, the SCTP stream management device has a 0x82 (1000 0010) padding corresponding to a failure of address 2 and 0x93 corresponding to a failure of address 19. (1001 0011) The padding is repeatedly transmitted.

On the other hand, when the SCTP stream management apparatus determines that the failure of the corresponding address is recovered after the failure of the address of the device, the upper two bits of the field indicating the length of the SCTP packet are set to "01", and the lower 6 bits are set. Sends a padding record of the number of the address where the fault was recovered. For example, if the failure of address 2 and address 19 occurs, but only the failure of address 2 is recovered, the SCTP stream management device is configured with 0x42 (0100 0010) padding corresponding to the failure recovery of address 2 and 19. 0x93 padding corresponding to failure of address 1 is repeatedly transmitted.

In addition, when the SCTP stream management apparatus determines that only the address (network interface) transmitting the current packet among all the addresses (network interfaces) of the apparatus is normally operated, the upper two bits of the field indicating the length of the SCTP packet are " 11 "and pad the lower 6 bits with" 0 ".

In step 313, the SCTP stream management apparatus transmits the generated SCTP packet to the counterpart node to notify the status of the network interface of the SCTP stream management apparatus.

Thereafter, the SCTP stream management apparatus ends the present algorithm.

4 is a flowchart illustrating an operation of an SCTP stream management apparatus for confirming a state of a network interface according to an exemplary embodiment of the present invention.

Here, the SCTP stream management apparatus for checking the state of the network interface means a counter node that receives a SCTP (Stream Control Transmission Protocol) packet transmitted by the SCTP stream management apparatus of FIG. 3.

Referring to FIG. 4, the SCTP stream management apparatus (the counterpart node receiving the SCTP packet) first checks whether the SCTP packet is received from the counterpart node, that is, the stream management apparatus of FIG. 3 in step 401. Herein, the SCTP packet includes information indicating the state of the IP address of the device that transmitted the packet, that is, the state of the network interface according to the present invention.

If the SCTP packet is not received, the SCTP stream management device (a counterpart node receiving the SCTP packet) performs the process of step 401 again.

On the other hand, when confirming that the SCTP packet is received, the SCTP stream management device (a counterpart node receiving the SCTP packet) proceeds to step 403 to indicate the state of the IP address of the device that transmitted the packet, that is, the state of the network interface. After analyzing the received packet to confirm the information, the process proceeds to step 405 and checks the address connection state of the partner node according to the analysis of step 403. That is, step 405 is a process of checking whether the connection status of the address connection status network interface of the counterpart node is good or a failure occurs or whether recovery is completed after a failure occurs, and receiving the SCTP stream management device (SCTP packet). The counterpart node) may check the address connection state of the counterpart node using the information defined as shown in Table 2 below.

Top 2 bits Setting contents Lower 6 bit information 00 All addresses work fine Set all to "0" 01 Failover at Specific Addresses Corresponding address number 10 Failure of specific address Fault address number 11 Only current address works normally Set all to "0"

For example, when the SCTP stream management device (the other node receiving the SCTP packet) receives an SCTP packet having the upper two bits of the field indicating the length of the SCTP packet from the other node set to "10", all addresses are received. It can be determined that a failure has occurred in a specific address among the (network interface), and the failing address can be determined by checking the number of the failed address (the number corresponding to the address used in the network interface) included in the lower 6 bits.

In step 407, the SCTP stream management device (the counter node receiving the SCTP packet) updates address connection state information. Here, the address connection state information refers to information that summarizes the address connection state of the counterpart node.

Thereafter, the SCTP stream management apparatus (the counter node receiving the SCTP packet) proceeds to step 409 and transmits a heartbeat chunk to all addresses except the failed address, and ends the present algorithm.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram showing the configuration of a typical SCTP packet;

2 is a block diagram showing the configuration of an SCTP stream management apparatus according to an embodiment of the present invention;

3 is a flowchart illustrating a process of generating connection state information of a network interface in an SCTP stream management apparatus according to an embodiment of the present invention;

4 is a flowchart illustrating an operation of an SCTP stream management apparatus for confirming a state of a network interface according to an exemplary embodiment of the present invention.

Claims (4)

In the SCTP stream management device for generating connection status information of the network interface, An address manager configured to set a number indicating a rank of addresses connected to a counterpart node, check a connection state of the addresses, and generate an SCTP packet including information indicating a connection state of the checked addresses; And a controller for processing to transmit the SCTP packet generated by the address manager to the counterpart node. In the SCTP stream management device for checking the connection state of the network interface, When receiving the SCTP packet from the partner node, an address management unit for analyzing the received packet to check the address connection state of the partner node, And a control unit which checks the address connection state information confirmed by the address management unit and transmits the heartbeat chunk to all addresses except the failed address. In the method for generating the connection state information of the network interface in the SCTP stream management device, Setting a number indicating a rank of the addresses connected to the counterpart node; Checking a connection state of the addresses; Generating an SCTP packet including information indicating a connection state of the checked addresses; And transmitting the generated SCTP packet to the counterpart node. In the method for checking the connection state of the network interface in the SCTP stream management device, When receiving an SCTP packet from a counterpart node, analyzing the received packet to determine an address connection state of the counterpart node; Updating and storing the checked address connection state information; And checking the address connection state information and transmitting a heartbeat chunk to all addresses except for the failed address.

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