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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- CN102611631A CN102611631A CN2012101066581A CN201210106658A CN102611631A CN 102611631 A CN102611631 A CN 102611631A CN 2012101066581 A CN2012101066581 A CN 2012101066581A CN 201210106658 A CN201210106658 A CN 201210106658A CN 102611631 A CN102611631 A CN 102611631A
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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 the network communications technology, relate in particular to protocol massages guard method under a kind of pseudo-line (PW, Pseudo Wire) scene, Apparatus and system.
Background technology
Data communications equipment is being carried out protocol massages when mutual, and place end equipment can be with the protocol massages that receives, and the central processing unit (CPU, Central Processing Unit) that sends to place end equipment is handled.Because the disposal ability of this CPU is limited, if this CPU receives other a large amount of messages within a certain period of time, for example; When receiving network attack; Place end equipment can receive a large amount of attack messages within a certain period of time, and then, place end equipment can send to CPU with these attack messages; Can influence the processing of CPU like this, even losing of protocol massages occur protocol massages.
Packet Transport Network (PTN, Packet Transport Network) equipment need be operated in the Virtual Private Network (VPN, Virtual Private Network) usually.In some networks, for example, based on multiprotocol label switching (MPLS; Multiple protocol Label Switching) among the VPN, MPLS label capable of using comes the tunneling message, is about to protocol massages and is encapsulated in the MPLS label; Then; With the above-mentioned MPLS label (here, the message that this type is packaged with the MPLS label is referred to as the MPLS label packet) that is packaged with protocol massages of another kind of message encapsulation, then; In network, reach LA Management Room and transmit this MPLS label packet, and utilize the CPU of place end equipment to handle this MPLS label packet.
The type of message of protocol massages can be divided according to the header in the message format; For example in the message format of ospf (OSPF) agreement; Type (type) field according to header can be divided into the protocol massages under the ospf protocol following five types: Hello (calling) message, DD (database description) message, LSR (Link State request) message, LSU (Link State renewal) message and LSACK (link state acknowledgment) message; In the normal message processing method, protocol protection speed limit mechanism is provided, that is: has been limited in the quantity of the message that transmits in the unit interval in the message transmissions passage.But; Because the MPLS label packet is the type of message of tunneling message in its label not, therefore, normal protocol message processing method based on the MPLS label packet; In the processing procedure of MPLS label packet; Dissimilar MPLS label packets can interfere with each other, and then influence the processing of said CPU to said MPLS label packet, even also the problem that the MPLS label packet is lost can occur.
Summary of the invention
In view of this, main purpose of the present invention is to provide protocol massages guard method under a kind of pseudo-field of line scape, Apparatus and system, reduces interfering with each other between the dissimilar MPLS label packets, and then prevents losing of MPLS label packet.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides protocol massages guard method under a kind of pseudo-field of line scape, said method comprises:
After place end equipment receives the MPLS label packet of the protocol type that is packaged with protocol massages; Said MPLS label packet is resolved; Obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit according to said type of message.
Preferably, the process that the protocol type of said protocol massages is encapsulated in the said MPLS label packet comprises: the tag field that pseudo-line traffic control word in the said MPLS label packet is set for and said protocol massages corresponding protocols type coding value.
Preferably, said place end equipment specifically comprises through the process of resolving the type of message that obtains said protocol massages:
Said place end equipment obtains the protocol type of said protocol massages according to the tag field of pseudo-line traffic control word in the said MPLS label packet; And according to said protocol type the header of said protocol massages is further resolved, obtain the type of message of said protocol massages.
Preferably; The process of said protocol protection speed limit specifically comprises: place end equipment is classified said MPLS label packet according to the type of message of the protocol massages in the said MPLS label packet, carries out the protocol protection speed limit for each type MPLS label packet all uses independent speed limit passage.
Preferably, use token bucket algorithm to carry out said protocol protection speed limit operation.
The present invention also provides protocol massages protection place end equipment under a kind of pseudo-field of line scape, and said place end equipment comprises: message receiver module and protocol protection module; Wherein,
Said message receiver module is used to receive said MPLS label packet, and said MPLS label packet is forwarded to said protocol protection module;
Said protocol protection module is used for said MPLS label packet is resolved, and obtains the type of message of said protocol massages, and according to said type of message said MPLS label packet is carried out the protocol protection speed limit.
Preferably; Said protocol protection module; Specifically be used for: resolve the Flags field value of pseudo-line traffic control word, and according to be recorded in place end equipment pass through preestablish or said Flags field value carried out backwards calculation through the protocol type encoded radio of the protocol massages that consult to obtain, obtain the protocol type of protocol massages; According to said protocol type the header of said MPLS label packet is further resolved, obtain the type of message of said protocol massages.
The present invention also provides protocol massages protection source end equipment under a kind of pseudo-field of line scape, and said source end equipment comprises: second protocol module, message package module and message sending module; Wherein,
Said second protocol module is used to construct protocol massages, and said protocol massages is sent to said message package module;
Said message package module is used for the protocol type of said protocol massages and said protocol massages is encapsulated in the MPLS label packet, and said MPLS label packet is sent to the message sending module;
Said message sending module is used for said MPLS label packet is forwarded to said place end equipment.
Preferably; Said message package module specifically is used for: the tag field that the pseudo-line traffic control word of said MPLS label packet is set with the protocol type encoded radio of protocol massages; And said protocol massages is encapsulated in the said MPLS label packet, the MPLS label packet after will encapsulating then sends to said message sending module.
The present invention also provides protocol massages protection system under a kind of pseudo-field of line scape, and said system comprises: source end equipment and place end equipment; Wherein,
Source end equipment be used for the protocol type of said protocol massages and said protocol massages is encapsulated in the MPLS label packet, and the MPLS label packet after will encapsulating sends to place end equipment;
Place end equipment; Be used to receive the MPLS label packet of the protocol type that is packaged with protocol massages; Said MPLS label packet is resolved, obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit according to said type of message.
Protocol massages guard method under the pseudo-field of line scape provided by the invention, Apparatus and system; Utilize the protocol type of the pseudo-line traffic control word tunneling message of MPLS label packet; Make place end equipment after receiving said MPLS label packet, can obtain the protocol type of protocol massages, and obtain the type of message of protocol massages through further parsing through parsing; Then; According to said type of message said MPLS label packet is carried out the protocol protection speed limit, said method, Apparatus and system reduce or have avoided interfering with each other between the dissimilar MPLS label packet, and then prevent losing of MPLS label packet.
Description of drawings
Fig. 1 is the schematic flow sheet of protocol massages guard method under the pseudo-field of line scape according to the present invention;
Fig. 2 is the sketch map of protocol massages protection system under the pseudo-field of line scape according to the present invention;
Fig. 3 for according to the embodiment of the invention to protocol massages encapsulate, the system schematic of transmitting-receiving and protocol protection.
Embodiment
Basic thought of the present invention is: after place end equipment receives the MPLS label packet that is packaged with the protocol massages protocol type; Said MPLS label packet is resolved; Obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit according to said type of message.
Fig. 1 is the schematic flow sheet of protocol massages guard method under the pseudo-field of line scape according to the present invention, and as shown in Figure 1, said flow process comprises following step:
Step 101: source end equipment judges self whether to have opened pseudo-line traffic control word function; If said source end opening of device pseudo-line traffic control word function; Then end equipment in source is encapsulated in the protocol type of protocol massages and this protocol massages in the MPLS label packet; And carry out following step, if said source end equipment is not opened pseudo-line traffic control word function, then send and receive flow process and handle according to normal protocol massages;
Wherein, said pseudo-line traffic control word is the packet in the MPLS label packet, in relevant criterion, for example stipulates among the RFC4385, and pseudo-line traffic control word accounts for 4 bytes; In the present invention; The mark of pseudo-line traffic control word capable of using (Flags) field; That is: the 4-7 position of pseudo-line traffic control word, the protocol type of tunneling message, concrete process comprises: source end equipment will preestablish or insert in the said Flags field through the protocol type encoded radio of the protocol massages consulting to obtain; For example; Representing the protocol type of protocol massages with binary " 0001 " encoded radio is IP (Internet protocol) message, or to represent the protocol type of protocol massages with binary " 0010 " encoded radio be UDP (UDP) message, or the like.
Step 102: the MPLS label packet after source end equipment will encapsulate sends to place end equipment.
Step 103: after place end equipment receives said MPLS label packet; Judge whether place end equipment self has opened pseudo-line traffic control word function; If said place end opening of device pseudo-line traffic control word function; Then execution in step 104, if said place end equipment is not opened pseudo-line traffic control word function, then send and receive flow process according to normal protocol massages and handle.
Step 104: said place end equipment is resolved said MPLS label packet; Obtain the type of message of said protocol massages; Said process specifically comprises: said place end equipment judges whether said MPLS label packet is packaged with pseudo-line traffic control word, if said MPLS label packet does not encapsulate pseudo-line traffic control word, then said MPLS label packet is divided into the MPLS label packet of unknown type of message and carry out step 105; If said MPLS label packet is packaged with pseudo-line traffic control word; Then resolve the Flags field value of said pseudo-line traffic control word, and according to be recorded in place end equipment pass through preestablish or said Flags field value carried out backwards calculation through the protocol type encoded radio of the protocol massages that consult to obtain, obtain the protocol type of protocol massages; At this moment; If the protocol type that obtains is not known type, that is, in the end equipment of place, there are not record and the corresponding protocol type of protocol type that parses; Then said MPLS label packet is divided into the MPLS label packet of unknown type of message, and carry out step 105; Then; According to said protocol type the header of said MPLS label packet is further resolved, obtain the type of message of said protocol massages, same; If the type of message of the protocol massages that obtains through above-mentioned further resolving is not known type; That is, in the end equipment of place, do not have record and the corresponding type of message of type of message that parses, then equally this MPLS label packet is divided into the MPLS label packet of unknown type of message.
Step 105: said place end equipment; According to the type of message that parses; Said MPLS label packet is carried out the protocol protection speed limit; Thereby the CPU that said MPLS label packet is sent to place end equipment further handles, and for example obtains the content of protocol massages and handles accordingly etc. according to the content of said protocol massages;
Wherein, The process that said MPLS label packet is carried out the protocol protection speed limit specifically comprises: said MPLS label packet is classified, and the MPLS label packet that will be packaged with identical type of message is divided into one type, and independent speed limit passage all is provided and carries out the protocol protection speed limit for each type MPLS label packet; For example; Use token bucket algorithm to carry out the protocol protection speed limit, and be defined in the speed limit passage, allow each second 100 messages at most through this speed limit passage; Here need to prove, in above-mentioned assorting process,, also need it be divided into one type of MPLS label packet, and in the process of protocol protection speed limit, also will distribute a speed limit passage for it for the MPLS label packet of unknown type of message.
Fig. 2 is the sketch map of protocol massages protection system under the pseudo-field of line scape according to the present invention, and as shown in Figure 2, said system comprises:
Source end equipment is used to construct said protocol massages, and the protocol type of protocol massages and said protocol massages is encapsulated in the MPLS label packet, then said MPLS label packet is sent to place end equipment;
Said place end equipment is used to receive said MPLS label packet, and said MPLS label packet is resolved, and obtains the type of message of said protocol massages, and according to said type of message said MPLS label packet is carried out the protocol protection speed limit.
Preferably, said place end equipment comprises: message receiver module, protocol protection module and first protocol module; Wherein,
Said message receiver module is used to receive the MPLS label packet, and said MPLS label packet is forwarded to said protocol protection module;
Said protocol protection module; Be used for said MPLS label packet is resolved; Obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit, and said MPLS label packet is reported said first protocol module according to said type of message;
Said first protocol module is used for that the MPLS label packet that receives is carried out normal protocol massages and handles.
Said protocol protection module; Specifically be used for: the Flags field value of resolving pseudo-line traffic control word; And according to be recorded in place end equipment pass through preestablish or said Flags field value carried out backwards calculation through the protocol type encoded radio of the protocol massages that consult to obtain; Obtain the protocol type of protocol massages, the header of said MPLS label packet is further resolved, obtain the type of message of said protocol massages according to said protocol type.
Preferably, said source end equipment comprises: second protocol module, message package module and message sending module; Wherein,
Said second protocol module is used to construct protocol massages, and said protocol massages is sent to said message package module;
Said message package module is used for the protocol type of said protocol massages and said protocol massages is encapsulated in the MPLS label packet, and said MPLS label packet is sent to the message sending module;
Said message sending module is used for said MPLS label packet is forwarded to said place end equipment.
Said message package module specifically is used for: the tag field that the pseudo-line traffic control word of said MPLS label packet is set with the protocol type encoded radio of protocol massages; And said protocol massages is encapsulated in the said MPLS label packet, the MPLS label packet after will encapsulating then sends to said message sending module.
Wherein, The process of the protocol type of said source end equipment packages protocol massages and protocol massages; And said place end equipment resolves said MPLS label packet, thereby obtains type of message and can carry out with reference to the description in above-mentioned steps 101 to the step 105 according to the detailed process that said type of message carries out the protocol protection speed limit.
According to one embodiment of present invention; Source end equipment can comprise: two distribution switch, two Serial Port Lines, two twisted-pair feeders and a computer that comprises two network interface cards; Wherein, In said two distribution switch each all comprises a master control borad and a cable card board, all comprises protocol module at said master control borad and cable card board, and said cable card board comprises message package module, message sending module, message receiver module and protocol protection module.
Fig. 3 for according to the embodiment of the invention to protocol massages encapsulate, the system schematic of transmitting-receiving and protocol protection, as shown in Figure 3, source end equipment comprises: message package module, message sending module, and agreement submodule A1, A2 and A3; Place end equipment comprises: message receiver module, protocol protection module, and agreement submodule B1, B2 and B3.Two network interface cards of computer link to each other with the management mouth of two switches respectively through two twisted-pair feeders, and two serial ports of computer pass through two Serial Port Lines link to each other with the serial ports of these two switches respectively (Fig. 3 is not shown).Wherein, agreement submodule A1, A2 and A3, and agreement submodule B1, B2 and B3 are respectively applied for the processing of the MPLS label packet of different type of messages.To protocol massages encapsulate, the flow process of transmitting-receiving and protocol protection comprises the steps:
Step 201: agreement submodule A1 constructs protocol massages, the protocol massages structure is accomplished message send to master control borad, and the protocol type of protocol massages content and protocol massages is sent to cable card board;
Step 202: the message package module on the cable card board is encapsulated into protocol massages in the MPLS label packet; And judge whether source end equipment has opened pseudo-line traffic control word function; If opened pseudo-line traffic control word function; Then according to said predefined or (here through the protocol type encoded radio of the protocol massages that consult to obtain; This protocol massages encapsulation uses encoded radio " 0001 " to represent the IP message) encoded radio " 0001 " is arranged in the Flags field of the pseudo-line traffic control word of said MPLS label packet; And said MPLS label packet sent to the message sending module, if do not open pseudo-line traffic control word function, then said cable card board directly sends to the message sending module through the MPLS label packet of message sending module after with said encapsulation;
Step 203: said message sending module is transmitted to place end equipment with said MPLS label packet through edge-to-edge pseudo-line simulation (PWE3, Pseudo-Wire Emulation Edge to Edge) agreement;
Step 204: the message receiver module on the end equipment cable card board of said place receives said MPLS label packet, and said MPLS label packet is forwarded to the protocol protection module;
Step 205: said protocol protection module is resolved said MPLS label packet,
Particularly; Judge whether said MPLS label packet is packaged with pseudo-line traffic control word; If be packaged with pseudo-line traffic control word in the said MPLS label packet; Then resolve the Flags field of said pseudo-line traffic control word; And according to be recorded in place end equipment pass through preestablish or said Flags field value carried out backwards calculation through the protocol type encoded radio of the protocol massages that consult to obtain, obtain the protocol type of protocol massages, and further further resolve according to the header of said MPLS label packet; Obtain the type of message of said protocol massages, if do not encapsulate pseudo-line traffic control word in the said MPLS label packet then the type of message of said MPLS label packet is divided into UNKNOWN TYPE;
Step 206: said protocol protection module is further resolved the protocol massages in the MPLS label packet, judges needs according to the information in the said protocol massages said MPLS label packet is sent to agreement submodule B1;
Step 207: said protocol protection module uses the speed limit passage that leads to agreement submodule B1 that said MPLS label packet is carried out the token bucket speed limit according to type of message, thereby said MPLS label packet is sent to agreement submodule B1;
Step 208: said agreement submodule B1 carries out normal protocol massages to said MPLS label packet to be handled.
In sum; Protocol massages guard method under the pseudo-field of line scape provided by the invention, Apparatus and system; Utilize the protocol type of the pseudo-line traffic control word tunneling message of MPLS label packet; Thereby place end equipment can parse the type of message of said protocol massages, and according to said type of message the MPLS label packet is carried out the protocol protection speed limit, makes and does not disturb mutually between the dissimilar MPLS label packets; And then solved, for example because excessive former of network attack or other quantities of messages thereby the problem that causes the MPLS label packet to be lost.
The above is merely preferred embodiment of the present invention, is not to be used to limit the present invention, and for a person skilled in the art, the present invention can have various changes and variation.On the basis of spirit of the present invention and principle, the various modifications of being made, be equal to replacement and improvement etc., all be included within protection scope of the present invention.
Claims (10)
1. protocol massages guard method under the pseudo-field of line scape is characterized in that said method comprises:
After place end equipment receives the MPLS label packet of the protocol type that is packaged with protocol massages; Said MPLS label packet is resolved; Obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit according to said type of message.
2. protocol massages guard method according to claim 1; It is characterized in that the process that the protocol type of said protocol massages is encapsulated in the said MPLS label packet comprises: the tag field that pseudo-line traffic control word in the said MPLS label packet is set for and said protocol massages corresponding protocols type coding value.
3. protocol massages guard method according to claim 1 is characterized in that, said place end equipment specifically comprises through the process of resolving the type of message that obtains said protocol massages:
Said place end equipment obtains the protocol type of said protocol massages according to the tag field of pseudo-line traffic control word in the said MPLS label packet; And according to said protocol type the header of said protocol massages is further resolved, obtain the type of message of said protocol massages.
4. according to claim 1,2 or 3 described protocol massages guard methods; It is characterized in that; The process of said protocol protection speed limit specifically comprises: place end equipment is classified said MPLS label packet according to the type of message of the protocol massages in the said MPLS label packet, carries out the protocol protection speed limit for each type MPLS label packet all uses independent speed limit passage.
5. protocol massages guard method according to claim 4 is characterized in that, uses token bucket algorithm to carry out said protocol protection speed limit operation.
6. protocol massages protection place end equipment under the pseudo-field of line scape is characterized in that said place end equipment comprises: message receiver module and protocol protection module; Wherein,
Said message receiver module is used to receive said MPLS label packet, and said MPLS label packet is forwarded to said protocol protection module;
Said protocol protection module is used for said MPLS label packet is resolved, and obtains the type of message of said protocol massages, and according to said type of message said MPLS label packet is carried out the protocol protection speed limit.
7. protocol massages protection according to claim 6 place end equipment; It is characterized in that; Said protocol protection module; Specifically be used for: resolve the Flags field value of pseudo-line traffic control word, and according to be recorded in place end equipment pass through preestablish or said Flags field value carried out backwards calculation through the protocol type encoded radio of the protocol massages that consult to obtain, obtain the protocol type of protocol massages; According to said protocol type the header of said MPLS label packet is further resolved, obtain the type of message of said protocol massages.
8. protocol massages protection source end equipment under the pseudo-field of line scape is characterized in that said source end equipment comprises: second protocol module, message package module and message sending module; Wherein,
Said second protocol module is used to construct protocol massages, and said protocol massages is sent to said message package module;
Said message package module is used for the protocol type of said protocol massages and said protocol massages is encapsulated in the MPLS label packet, and said MPLS label packet is sent to the message sending module;
Said message sending module is used for said MPLS label packet is forwarded to said place end equipment.
9. protocol massages protection according to claim 8 source end equipment; It is characterized in that; Said message package module specifically is used for: the tag field that the pseudo-line traffic control word of said MPLS label packet is set with the protocol type encoded radio of protocol massages; And said protocol massages is encapsulated in the said MPLS label packet, the MPLS label packet after will encapsulating then sends to said message sending module.
10. protocol massages protection system under the pseudo-field of line scape is characterized in that said system comprises: source end equipment and place end equipment; Wherein,
Source end equipment be used for the protocol type of said protocol massages and said protocol massages is encapsulated in the MPLS label packet, and the MPLS label packet after will encapsulating sends to place end equipment;
Place end equipment; Be used to receive the MPLS label packet of the protocol type that is packaged with protocol massages; Said MPLS label packet is resolved, obtain the type of message of said protocol massages, and said MPLS label packet is carried out the protocol protection speed limit according to said type of message.
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