CN102611631A - Method, device and system for protecting protocol under pseudo-wire scene - Google Patents
Method, device and system for protecting protocol under pseudo-wire scene Download PDFInfo
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Abstract
The invention provides a method for protecting a protocol under a pseudo-wire scene. The method comprises the steps of: after terminal equipment receives an MPLS (Multi-Protocol Label Switching) label message packaged with a protocol type of a protocol message, analyzing the MPLS label message to obtain the message type of the protocol message; and carrying out protocol protection speed limit on the MPLS label message according to the message type. The invention also provides a device and system for protecting the protocol under the pseudo-wire scene. According to the method, the device and the system, mutual interference among different types of MPLS label messages is reduced or avoided, and further the loss of the MPLS label message is prevented.
Description
Technical Field
The present invention relates to network communication technologies, and in particular, to a method, an apparatus, and a system for protecting a protocol packet in a Pseudo Wire (PW) scenario.
Background
When the data communication device performs protocol packet interaction, the sink device sends the received protocol packet to a Central Processing Unit (CPU) of the sink device for Processing. Because the processing capacity of the CPU is limited, if the CPU receives a large amount of other messages within a certain time, for example, when the CPU is attacked by a network, the sink device receives a large amount of attack messages within a certain time, and then the sink device sends the attack messages to the CPU, which may affect the processing of the CPU on the protocol messages, and even cause the loss of the protocol messages.
Packet Transport Network (PTN) devices typically need to operate in a Virtual Private Network (VPN). In some networks, for example, in a VPN based on multi-protocol Label Switching (MPLS), a protocol packet may be encapsulated by using an MPLS Label, that is, the protocol packet is encapsulated in the MPLS Label, and then the MPLS Label encapsulating the protocol packet is encapsulated by using another type of packet (herein, such a packet encapsulating the MPLS Label is collectively referred to as an MPLS Label packet), and then, such an MPLS Label packet is transmitted in a network and between network devices, and is processed by using a CPU of a destination device.
The packet Type of the protocol packet may be divided according to a header in a packet format, for example, in the packet format of the Open Shortest Path First (OSPF) protocol, the protocol packet under the OSPF protocol may be divided into five types according to a Type field of the header: hello (call) messages, DD (database description) messages, LSR (link state request) messages, LSU (link state update) messages and LSACK (link state acknowledgement) messages; in the normal message processing method, a protocol protection speed limit mechanism is provided, namely: the number of messages transmitted per unit time in the message transmission channel is limited. However, because the MPLS label packet does not have the packet type of encapsulating the protocol packet in the label thereof, in the normal protocol packet processing method based on the MPLS label packet, in the processing process of the MPLS label packet, MPLS label packets of different types may interfere with each other, thereby affecting the processing of the MPLS label packet by the CPU, and even causing a problem of MPLS label packet loss.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method, an apparatus, and a system for protecting a protocol packet in a pseudo-wire scenario, so as to reduce mutual interference between MPLS label packets of different types, and further prevent loss of the MPLS label packets.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for protecting a protocol message in a pseudo-wire scene, which comprises the following steps:
after receiving the MPLS label message of the protocol type encapsulated with the protocol message, the sink terminal equipment analyzes the MPLS label message to obtain the message type of the protocol message, and carries out protocol protection speed limit on the MPLS label message according to the message type.
Preferably, the process of encapsulating the protocol type of the protocol packet in the MPLS label packet includes: and setting a marking field of a pseudo-line control word in the MPLS label message as a protocol type coding value corresponding to the protocol message.
Preferably, the process of obtaining the message type of the protocol message by the sink device through analysis specifically includes:
and the sink end equipment obtains the protocol type of the protocol message according to the marking field of the pseudo-wire control word in the MPLS label message, and further analyzes the header of the protocol message according to the protocol type to obtain the message type of the protocol message.
Preferably, the process of protecting the speed limit by the protocol specifically includes: and the sink terminal equipment classifies the MPLS label messages according to the message types of the protocol messages in the MPLS label messages, and uses an independent speed limiting channel for each type of MPLS label messages to carry out protocol protection speed limitation.
Preferably, the protocol protection rate limiting operation is performed using a token bucket algorithm.
The invention also provides a device for protecting the host end by the protocol message in the pseudo-wire scene, wherein the host end device comprises: the device comprises a message receiving module and a protocol protection module; wherein,
the message receiving module is used for receiving the MPLS label message and forwarding the MPLS label message to the protocol protection module;
and the protocol protection module is used for analyzing the MPLS label message, obtaining the message type of the protocol message and carrying out protocol protection speed limit on the MPLS label message according to the message type.
Preferably, the protocol protection module is specifically configured to: analyzing a flag field value of a pseudo-wire control word, reversely calculating the flag field value according to a protocol type coding value of a protocol message recorded in a host device and obtained by presetting or negotiation to obtain a protocol type of the protocol message, and further analyzing a header of the MPLS label message according to the protocol type to obtain the message type of the protocol message.
The invention also provides a source end device for protecting the protocol message in the pseudo-wire scene, wherein the source end device comprises: the second protocol module, the message packaging module and the message sending module; wherein,
the second protocol module is used for constructing a protocol message and sending the protocol message to the message encapsulation module;
the message encapsulation module is used for encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and sending the MPLS label message to a message sending module;
and the message sending module is used for forwarding the MPLS label message to the host end equipment.
Preferably, the packet encapsulation module is specifically configured to: and setting a marking field of a pseudo-wire control word in the MPLS label message by using a protocol type coding value of the protocol message, encapsulating the protocol message in the MPLS label message, and then sending the encapsulated MPLS label message to the message sending module.
The invention also provides a system for protecting the protocol message in the pseudo-wire scene, which comprises the following steps: a source device and a sink device; wherein,
the source end equipment is used for encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and sending the encapsulated MPLS label message to the sink end equipment;
and the sink end equipment is used for receiving the MPLS label message of the protocol type encapsulated with the protocol message, analyzing the MPLS label message to obtain the message type of the protocol message, and performing protocol protection speed limit on the MPLS label message according to the message type.
According to the method, the device and the system for protecting the protocol message in the pseudo-wire scene, the protocol type of the protocol message is encapsulated by using the pseudo-wire control word of the MPLS label message, the protocol type of the protocol message can be obtained through analysis after the host equipment receives the MPLS label message, the message type of the protocol message is obtained through further analysis, and then the protocol protection speed limit is carried out on the MPLS label message according to the message type.
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FIG. 1 is a schematic flow chart of a protocol packet protection method in a pseudo-wire scenario according to the present invention;
FIG. 2 is a schematic diagram of a protocol packet protection system in a pseudo-wire scenario according to the present invention;
fig. 3 is a schematic diagram of a system for encapsulating, transceiving and protecting a protocol packet according to an embodiment of the present invention.
Detailed Description
The basic idea of the invention is: after receiving the MPLS label message encapsulated with the protocol type of the protocol message, the host end equipment analyzes the MPLS label message to obtain the message type of the protocol message, and performs protocol protection speed limit on the MPLS label message according to the message type.
Fig. 1 is a schematic flow chart of a protocol packet protection method in a pseudo-wire scenario according to the present invention, and as shown in fig. 1, the flow includes the following steps:
step 101: the source end equipment judges whether the source end equipment starts a pseudo-wire control word function, if the source end equipment starts the pseudo-wire control word function, the source end equipment encapsulates a protocol message and the protocol type of the protocol message in an MPLS label message and carries out the following steps, and if the source end equipment does not start the pseudo-wire control word function, the source end equipment carries out processing according to the normal protocol message sending and receiving flow;
wherein the pseudowire control word is a data packet in an MPLS label packet, and the pseudowire control word occupies 4 bytes as specified in a relevant standard, for example, RFC 4385; in the present invention, the Flags (Flags) field of the pseudowire control word may be utilized, namely: the 4 th to 7 th bits of the pseudo wire control word, the protocol type of the protocol message is encapsulated, and the specific process comprises the following steps: the source end device fills the preset or negotiated protocol type code value of the protocol packet into the Flags field, for example, the binary "0001" code value represents that the protocol type of the protocol packet is an IP (internet protocol) packet, or the binary "0010" code value represents that the protocol type of the protocol packet is a UDP (user datagram protocol) packet, and so on.
Step 102: and the source end equipment sends the encapsulated MPLS label message to the sink end equipment.
Step 103: after receiving the MPLS label packet, the host device determines whether the host device itself has an enabled pseudo-wire control word function, if the host device has enabled the pseudo-wire control word function, step 104 is executed, and if the host device has not enabled the pseudo-wire control word function, the host device performs processing according to a normal protocol packet sending and receiving flow.
Step 104: the host device analyzes the MPLS label packet to obtain a packet type of the protocol packet, where the process specifically includes: the sink device determines whether the MPLS label message is encapsulated with a pseudo-wire control word, if the MPLS label message is not encapsulated with a pseudo-wire control word, the MPLS label packet is divided into MPLS label packets of unknown packet type and step 105 is performed, if the MPLS label message is encapsulated with a pseudo wire control word, analyzing the flag field value of the pseudo wire control word, and according to the protocol type coding value of the protocol message recorded in the host end equipment and obtained by presetting or negotiation, carrying out reverse calculation on the flag field value to obtain the protocol type of the protocol message, at the moment, if the obtained protocol type is not the known type, that is, if the protocol type corresponding to the analyzed protocol type is not recorded in the sink device, dividing the MPLS label packet into MPLS label packets of unknown packet types, and performing step 105; then, further parsing the header of the MPLS label packet according to the protocol type to obtain the packet type of the protocol packet, and similarly, if the packet type of the protocol packet obtained through the further parsing is not a known type, that is, a packet type corresponding to the parsed packet type is not recorded in the sink device, the MPLS label packet is also divided into MPLS label packets of unknown packet types.
Step 105: the destination device performs protocol protection speed limit on the MPLS label packet according to the analyzed packet type, so as to send the MPLS label packet to a CPU of the destination device for further processing, for example, obtaining the content of the protocol packet and performing corresponding processing according to the content of the protocol packet;
the process of performing protocol protection speed limit on the MPLS label packet specifically includes: classifying the MPLS label messages, dividing the MPLS label messages packaged with the same message type into one type, providing a separate speed-limiting channel for each type of MPLS label messages, performing protocol protection speed limitation, for example, performing protocol protection speed limitation by using a token bucket algorithm, and defining that in one speed-limiting channel, at most 100 messages are allowed to pass through the speed-limiting channel every second; it should be noted that, in the above classification process, for an MPLS label packet of an unknown packet type, it is also necessary to divide the MPLS label packet into a class of MPLS label packets, and a speed-limiting channel is also allocated to the MPLS label packet in the process of protecting the speed limit by the protocol.
Fig. 2 is a schematic diagram of a protocol packet protection system in a pseudo-wire scenario according to the present invention, and as shown in fig. 2, the system includes:
the source end equipment is used for constructing the protocol message, encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and then sending the MPLS label message to the sink end equipment;
the host end equipment is used for receiving the MPLS label message, analyzing the MPLS label message, obtaining the message type of the protocol message, and carrying out protocol protection speed limit on the MPLS label message according to the message type.
Preferably, the sink device comprises: the device comprises a message receiving module, a protocol protection module and a first protocol module; wherein,
the message receiving module is used for receiving the MPLS label message and forwarding the MPLS label message to the protocol protection module;
the protocol protection module is used for analyzing the MPLS label message to obtain the message type of the protocol message, performing protocol protection speed limit on the MPLS label message according to the message type, and reporting the MPLS label message to the first protocol module;
and the first protocol module is used for carrying out normal protocol message processing on the received MPLS label message.
The protocol protection module is specifically configured to: analyzing a flag field value of a pseudo-wire control word, reversely calculating the flag field value according to a protocol type coding value of a protocol message recorded in a host device and obtained by presetting or negotiation to obtain a protocol type of the protocol message, and further analyzing a header of the MPLS label message according to the protocol type to obtain the message type of the protocol message.
Preferably, the source device includes: the second protocol module, the message packaging module and the message sending module; wherein,
the second protocol module is used for constructing a protocol message and sending the protocol message to the message encapsulation module;
the message encapsulation module is used for encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and sending the MPLS label message to a message sending module;
and the message sending module is used for forwarding the MPLS label message to the host end equipment.
The message encapsulation module is specifically configured to: and setting a marking field of a pseudo-wire control word in the MPLS label message by using a protocol type coding value of the protocol message, encapsulating the protocol message in the MPLS label message, and then sending the encapsulated MPLS label message to the message sending module.
The process of encapsulating the protocol packet and the protocol type of the protocol packet by the source device, and the specific process of analyzing the MPLS label packet by the sink device to obtain the packet type and limiting the speed for protocol protection according to the packet type may be performed with reference to the descriptions in the above step 101 to step 105.
According to an embodiment of the present invention, a source device may include: the system comprises two distributed switches, two serial ports, two twisted pairs and a computer comprising two network cards, wherein each of the two distributed switches comprises a main control board and a line card board, the main control board and the line card board comprise protocol modules, and the line card board comprises a message packaging module, a message sending module, a message receiving module and a protocol protection module.
Fig. 3 is a schematic diagram of a system for encapsulating, transceiving and protecting a protocol packet according to an embodiment of the present invention, where as shown in fig. 3, a source end device includes: the system comprises a message packaging module, a message sending module and protocol submodules A1, A2 and A3; the sink device includes: the device comprises a message receiving module, a protocol protection module and protocol sub-modules B1, B2 and B3. The two network cards of the computer are respectively connected with the management ports of the two switches through two twisted-pair lines, and the two serial ports of the computer are respectively connected with the serial ports of the two switches through two serial port lines (not shown in fig. 3). The protocol sub-modules a1, a2 and A3, and the protocol sub-modules B1, B2 and B3 are respectively used for processing MPLS label messages of different message types. The process of encapsulating, transmitting and receiving protocol messages and protecting the protocol comprises the following steps:
step 201: the protocol submodule A1 constructs a protocol message, sends a message of completing the construction of the protocol message to the main control board, and sends the content of the protocol message and the protocol type of the protocol message to the line card board;
step 202: a message packaging module on a line card board packages a protocol message into an MPLS label message and judges whether a source end device opens a pseudo-line control word function, if the pseudo-line control word function is opened, a coding value of 0001 is set in a Flags field of the MPLS label message pseudo-line control word according to a protocol type coding value of the protocol message (here, the coding value of 0001 is used for representing an IP message in the protocol message packaging at this time) which is preset or obtained through negotiation, and the MPLS label message is sent to a message sending module, and if the pseudo-line control word function is not opened, the line card board directly sends the packaged MPLS label message to the message sending module through the message sending module;
step 203: the message sending module forwards the MPLS label message to a host device through an Edge-to-Edge Pseudo Wire Emulation (PWE3, Pseudo-Wire Emulation Edge to Edge) protocol;
step 204: a message receiving module on the line card board of the host terminal equipment receives the MPLS label message and forwards the MPLS label message to a protocol protection module;
step 205: the protocol protection module analyzes the MPLS label message,
specifically, judging whether the MPLS label message is packaged with a pseudo-wire control word, if the MPLS label message is packaged with the pseudo-wire control word, analyzing a flag field of the pseudo-wire control word, performing reverse calculation on the flag field value according to a protocol type coded value of the protocol message, which is recorded in a host end device and is obtained through presetting or negotiation, so as to obtain a protocol type of the protocol message, further analyzing according to a header of the MPLS label message so as to obtain a message type of the protocol message, and if the MPLS label message is not packaged with the pseudo-wire control word, dividing the message type of the MPLS label message into unknown types;
step 206: the protocol protection module further analyzes the protocol message in the MPLS label message, and judges that the MPLS label message needs to be sent to a protocol submodule B1 according to the information in the protocol message;
step 207: the protocol protection module uses a speed-limiting channel leading to a protocol submodule B1 to limit the speed of a token bucket for the MPLS label message according to the message type, so that the MPLS label message is sent to a protocol submodule B1;
step 208: and the protocol submodule B1 performs normal protocol message processing on the MPLS label message.
In summary, according to the method, the apparatus, and the system for protecting a protocol packet in a pseudo-wire scene provided by the present invention, a protocol type of a protocol packet is encapsulated by using a pseudo-wire control word of an MPLS label packet, so that a host device can analyze the packet type of the protocol packet, and perform protocol protection speed limitation on the MPLS label packet according to the packet type, so that MPLS label packets of different types do not interfere with each other, thereby solving a problem of MPLS label packet loss caused by network attack or other reasons that the packet amount is too large.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Various modifications, equivalent substitutions, improvements and the like can be made without departing from the spirit and principles of the invention, and are intended to be included within the scope of the invention.
Claims (10)
1. A method for protecting protocol message in pseudo wire scene is characterized in that the method comprises the following steps:
after receiving the MPLS label message of the protocol type encapsulated with the protocol message, the sink terminal equipment analyzes the MPLS label message to obtain the message type of the protocol message, and carries out protocol protection speed limit on the MPLS label message according to the message type.
2. The method according to claim 1, wherein encapsulating the protocol type of the protocol packet in the MPLS label packet comprises: and setting a marking field of a pseudo-line control word in the MPLS label message as a protocol type coding value corresponding to the protocol message.
3. The method according to claim 1, wherein the process of the sink device obtaining the packet type of the protocol packet through parsing specifically includes:
and the sink end equipment obtains the protocol type of the protocol message according to the marking field of the pseudo-wire control word in the MPLS label message, and further analyzes the header of the protocol message according to the protocol type to obtain the message type of the protocol message.
4. The method for protecting protocol packets according to claim 1, 2 or 3, wherein the process of protecting the speed limit of the protocol specifically comprises: and the sink terminal equipment classifies the MPLS label messages according to the message types of the protocol messages in the MPLS label messages, and uses an independent speed limiting channel for each type of MPLS label messages to carry out protocol protection speed limitation.
5. The protocol packet protection method according to claim 4, wherein the protocol protection rate-limiting operation is performed using a token bucket algorithm.
6. A protocol message protection sink device under a pseudo wire scene is characterized in that the sink device comprises: the device comprises a message receiving module and a protocol protection module; wherein,
the message receiving module is used for receiving the MPLS label message and forwarding the MPLS label message to the protocol protection module;
and the protocol protection module is used for analyzing the MPLS label message, obtaining the message type of the protocol message and carrying out protocol protection speed limit on the MPLS label message according to the message type.
7. The protocol packet protection sink device according to claim 6, wherein the protocol protection module is specifically configured to: analyzing a flag field value of a pseudo-wire control word, reversely calculating the flag field value according to a protocol type coding value of a protocol message recorded in a host device and obtained by presetting or negotiation to obtain a protocol type of the protocol message, and further analyzing a header of the MPLS label message according to the protocol type to obtain the message type of the protocol message.
8. A source device for protecting a protocol packet in a pseudo-wire scene is characterized in that the source device comprises: the second protocol module, the message packaging module and the message sending module; wherein,
the second protocol module is used for constructing a protocol message and sending the protocol message to the message encapsulation module;
the message encapsulation module is used for encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and sending the MPLS label message to a message sending module;
and the message sending module is used for forwarding the MPLS label message to the host end equipment.
9. The protocol packet protection source device according to claim 8, wherein the packet encapsulation module is specifically configured to: and setting a marking field of a pseudo-wire control word in the MPLS label message by using a protocol type coding value of the protocol message, encapsulating the protocol message in the MPLS label message, and then sending the encapsulated MPLS label message to the message sending module.
10. A system for protecting protocol message in pseudo wire scene is characterized in that the system comprises: a source device and a sink device; wherein,
the source end equipment is used for encapsulating the protocol message and the protocol type of the protocol message in an MPLS label message and sending the encapsulated MPLS label message to the sink end equipment;
and the sink end equipment is used for receiving the MPLS label message of the protocol type encapsulated with the protocol message, analyzing the MPLS label message to obtain the message type of the protocol message, and performing protocol protection speed limit on the MPLS label message according to the message type.
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