CN101483582B - Method, system and router for implementing second and third layer multicast trace route - Google Patents
Method, system and router for implementing second and third layer multicast trace route Download PDFInfo
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Abstract
The invention provides a second layer and a third layer multicasting routes tracing and switching method, a system and a router, wherein the method comprises that an inquiry unit judges whether to execute the second layer multicasting route tracing, if so, a second layer multicasting route tracing IP option is added into the Internet group membership protocol (IGMP) tracert query message; the router of the last hop receives the IGMP Tracert Query message and judges whether the message contains a second layer multicasting route tracing IP option, if so, the router transmits the IGMP Tracert Query message to the second layer nodes downstream; if not, the router initiates a third multicasting route tracing. According to the invention, a second layer and a third layer multicasting routes tracing and switching can be realized by using the method, the system and the router.
Description
Technical field
The present invention relates to the multicast field, particularly realize method, system and the router that two or three layers of multicast trace route switch.
Background technology
Multicast trace route is meant to be followed the tracks of to the close set multicast forwarding path of multicast source the multicast packet recipient.Existing multicast routing track (Mtracert; Multicast Trace Route) be a kind of failure diagnosis tool of multicast routing protocol; The network manager carries out accident analysis, location through this instrument to multicast forwarding business on the network, realizes multicast trace route.
At present, adopt Mtracert can realize three layers of multicast trace route, that it adopts is IETF consensus standard draft-fenner-traceroute-ipm-01.txt.Three layers of multicast trace route are meant from reverse first hop router that traces into direct-connected multicast source of the last-hop Router of direct-connected multicast member, thereby obtain the path of a leaf of multicast tree to root.Referring to Fig. 1, Fig. 1 is a kind of multicast structural representation of the prior art, and wherein, the data flow that solid arrow is represented is partly for adopting Mtracert to realize the realization flow of three layers of multicast trace route.
Inquiry unit A is router or the webmaster main frame that the Mtracert instrument is installed; The network manager imports multicast and follows the tracks of (mtrace) order on inquiry unit A; Requirement comprises the IP address S (being source address) of Server1, the IP address D 1 (being destination address) of PC4 and the address G1 of PC4 place multicast group to following the tracks of to the multicast path of multicast source server (Server) 1 from multicast packet recipient PC4 in this order.According to this order; Inquiry unit A sends Internet user's igmpinternet to the last-hop Router R5 that arrives destination address and follows the tracks of inquiry (IGMP Tracert Query) message; Referring to Fig. 2, Fig. 2 is the structural representation of prior art IGMP Tracert Query message, and IGMP Tracert Query message comprises: length is that IP heading, IP option and the length of 20 bytes is the content part of 24 bytes; Wherein, the IP option has 0 or a plurality of.
After router R5 receives IGMP Tracert Query message, initiate three layers of multicast trace route.Specific operation process is: R5 along to the reverse multicast path of source address upwards a hop router R4 send IGMP tracking request (IGMP Tracert Request) message; This message is through revising IGMP type (IGMP Type) field in the IGMP Tracert Query message content part and forming at the IGMP Tracert Response data that amended IGMP Tracert Query message increases this node at the back; Wherein, carry the self information of router R5 among the IGMP Tracert Response data.Referring to Fig. 3, Fig. 3 is the structural representation of prior art IGMP Tracert Response data.
R4 increases the IGMP Tracert Response data that comprises the R4 self information at the back at this message after receiving the IGMP Tracert Request message of R5 transmission, forms new IGMP Tracert Request message, is sent to R2.And the like; After the first hop router R1 that connects multicast source Server 1 receives IGMP Tracert Request message; Then send IGMP Tracert response (Response) message to inquiry unit A; This IGMP Tracert Response message is through revising the IGMP the type field in the IGMP Tracert Request message content part; And the IGMP Tracert Response data of this node of increase forms in amended IGMP Tracert Request message; So include the IGMP Tracert Response data that each router added in the IGMP Tracert Request message transmission procedure, report by the flux of multicast information of last-hop Router R5 to the first hop router R1 to inquiry unit A.
Find out that by said process in the multicast trace route process of the prior art, after last-hop Router was received IGMP Tracert Query message, promptly upwards a hop node sent IGMP Tracert Request message, initiates multicast trace route; After first hop router was received IGMP Tracert Request, promptly the response address (generally being made as inquiry unit A) to IGMP Tracert Request appointment sent IGMP Tracert Response message, returns the multicast trace route response.Last-hop Router is switch transparent transmission IGMP Tracert Query message downstream not, and first hop router is switch transparent transmission IGMP Tracert Request message upstream not, therefore can not realize the switching of two or three layers of multicast trace route.
Summary of the invention
The embodiment of the invention proposes two kinds of method, system and routers of realizing that two or three layers of multicast trace route switch, realizes the switching of two or three layers of multicast trace route.
Technical scheme of the present invention is achieved in that
A kind of method that realizes that two or three layers of multicast trace route switch comprises:
Inquiry unit judges whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
Last-hop Router receives IGMP Tracert Query message, judges whether said message comprises Layer 2 Multicast path trace IP option, if comprise, and the said IGMP Tracert of two node layer transparent transmissions Query message downstream then; If do not comprise, then upstream nodes is sent IGMP Tracert Request message.
A kind of method that realizes that two or three layers of multicast trace route switch comprises:
Inquiry unit judges whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
First hop router receives the IGMP Tracert Request message that is generated by said IGMP Tracert Query message; Judge whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option; If comprise; Then in said IGMP Tracert Request message, increase Internet user's igmpinternet tracking response data block (IGMP Tracert Response data) of this node; Regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
A kind of system that realizes that two or three layers of multicast trace route switch comprises:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
Last-hop Router is used to receive IGMP Tracert Query message, judges whether said message comprises Layer 2 Multicast path trace IP option, if comprise, and the said IGMP Tracert of two node layer transparent transmissions Query message downstream then; If do not comprise, then upstream nodes is sent IGMP Tracert Request message.
A kind of router is characterized in that, said router comprises:
Receiver module is used to receive IGMP Tracert Query message;
Judge module is used for judging whether the IGMP Tracert Query message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module, be used for when the judged result of judge module when comprising, the said IGMP Tracert of two node layer transparent transmissions Query message downstream;
Initiation module, be used for when the judged result of judge module when not comprising, upstream nodes is sent IGMP Tracert Request message.
A kind of system that realizes that two or three layers of multicast trace route switch comprises:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
First hop router; Be used to receive the IGMP Tracert Request message that generates by said IGMP Tracert Query message; Judge whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option; If comprise; Then in said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node, regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
A kind of router comprises:
Receiver module is used to receive the IGMP Tracert Request message that is generated by IGMP Tracert Query message;
Judge module is used for judging whether the IGMP Tracert Request message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module; Be used for when the judged result of judge module when comprising; In said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node; Regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers;
Return module, be used for when the judged result of judge module when not comprising, the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
It is thus clear that; Method, system and router that two or three layers of multicast trace route of the realization that the embodiment of the invention proposes switch; Through add or do not add Layer 2 Multicast path trace IP option according to user's selection, in multicast IGMP Tracert Query message; When making message in receiving the multicast trace route process of the last-hop Router or first hop router; Can be through judging that whether comprising Layer 2 Multicast path trace IP option in the message determines whether carrying out the Layer 2 Multicast path trace, thus realized the switching of two or three layers of multicast trace route.
Description of drawings
Fig. 1 is a kind of multicast structural representation of the prior art;
Fig. 2 is the structural representation of prior art IGMP Tracert Query message;
Fig. 3 is the structural representation of prior art IGMP Tracert Response data;
Fig. 4 is the structural representation of prior art IP Traceroute option;
Fig. 5 is the structural representation of embodiment of the invention Layer 2 Multicast path trace IP option.
Embodiment
The embodiment of the invention proposes a kind of method that realizes that two or three layers of multicast trace route switch; After making last-hop Router receive IGMP Tracert Query message; Through judging whether carry the information that the Layer 2 Multicast path trace is carried out in expression in the IGMP Tracert Query message, thereby decision is transparent transmission IGMP Tracert Query message, or initiates three layers of multicast trace route; Perhaps; After making first hop router receive IGMP Tracert Request message; Through judging that whether carrying expression in the IGMP Tracert Request message carries out Layer 2 Multicast path trace handover information, thereby decision is to send IGMP Tracert Query message, still return three layers of multicast trace routes response to upper layer node.
The embodiment of the invention defines a kind of Layer 2 Multicast path trace IP option, is used to realize that two or three layers of multicast trace route switch.This Layer 2 Multicast path trace IP option can multiplexing prior art in existing IP multicast trace route (Traceroute) option; The length of this IP Traceroute option is 12 bytes; Referring to Fig. 4, Fig. 4 is the structural representation of prior art IP Traceroute option.Wherein, IP Traceroute option comprises:
F field (whether expression copies in the burst)=0 (expression " denying ");
C field (representing the classification of this IP option)=2 (expression " debugging & measures ");
Sequence number (Number) field (sequence number of representing this IP option)=18;
Length (Length) field (length of representing this IP option, unit is a byte)=12;
Value (Value) field (representing the value that this IP option carries).
The Layer 2 Multicast path trace IP option of embodiment of the invention definition can multiplexing above-mentioned existing IP Traceroute option, and the length of Layer 2 Multicast path trace IP option can be decided to be 4 bytes.Referring to Fig. 5, Fig. 5 is the structural representation of embodiment of the invention Layer 2 Multicast path trace IP option.Wherein, Layer 2 Multicast path trace IP option comprises:
F field (whether expression copies in the burst)=0 (expression " denying ");
C field (representing the classification of this IP option)=2 (expression " debugging & measures ");
Sequence number (Number) field (sequence number of representing this IP option)=18;
Length (Length) field (length of representing this IP option, unit is a byte)=4;
Value (Value) field (representing the value that this IP option carries)=0 (the Layer 2 Multicast path trace is carried out in expression).
The Number field of the Layer 2 Multicast path trace IP option of embodiment of the invention definition is identical with the Number field of existing IP Traceroute option in the prior art.
Certainly, the embodiment of the invention does not limit the multiplexing existing IP Traceroute option of Layer 2 Multicast path trace IP option, can multiplexing existing other IP option, or define new IP option yet; And do not limit length and value of Layer 2 Multicast path trace IP option etc.As long as define a kind of Layer 2 Multicast path trace IP option; Make the final jump switch, or first jump after switch receives the message that carries this Layer 2 Multicast path trace IP option; Can carry out corresponding operating, thereby realize that two or three layers of multicast trace routes switching get final product.Those skilled in the art expect the Layer 2 Multicast path trace IP option of other structures easily, give unnecessary details no longer one by one at this.
In the prior art, the user is after input mtrace order on the inquiry unit, and inquiry unit generates IGMP Tracert Query message, requires to carry out multicast trace route.The embodiment of the invention can be utilized this IGMP Tracert Query message, when the user selects to carry out the Layer 2 Multicast path trace, then in IGMP Tracert Query message, adds Layer 2 Multicast path trace IP option mentioned above.That is: inquiry unit judges whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
IGMP Tracert Query message transmissions is during to last-hop Router; Last-hop Router receives IGMP Tracert Query message; Judge whether said message comprises Layer 2 Multicast path trace IP option; If comprise, the said IGMP Tracert of two node layer transparent transmissions Query message downstream then; If do not comprise, then initiate three layers of multicast trace route.Three layers of multicast trace route of initiation described herein are: upstream nodes is sent IGMP Tracert Request message
Perhaps; During IGMP Tracert Request message transmissions to the first hop router that generates by IGMP Tracert Query message; First hop router receives IGMP Tracert Request message, judges whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option, if comprise; Then regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then return three layers of multicast trace route response.The three layers of multicast trace route response of returning described herein are: the response address (generally being made as inquiry unit A) to IGMP Tracert Request appointment sends IGMP Tracert Response message.
It is thus clear that, by the way, can, inquiry unit judge whether to carry out the Layer 2 Multicast path trace after generating IGMP Tracert Query, if carry out, then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option.After the follow-up last-hop Router or first hop router are received message, promptly can realize that two or three layers of multicast trace route switch according to whether comprising Layer 2 Multicast path trace IP option in this message.
The embodiment of the invention also proposes to realize the system of two or three layers of multicast trace routes switching, comprising:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
Last-hop Router is used to receive IGMP Tracert Query message, judges whether said message comprises Layer 2 Multicast path trace IP option, if comprise, and the said IGMP Tracert of two node layer transparent transmissions Query message downstream then; If do not comprise, then initiate three layers of multicast trace route.
The embodiment of the invention also proposes a kind of router, comprising:
Receiver module is used to receive IGMP Tracert Query message;
Judge module is used for judging whether the IGMP Tracert Query message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module, be used for when the judged result of judge module when comprising, the said IGMP Tracert of two node layer transparent transmissions Query message downstream;
Initiation module, be used for when the judged result of judge module when not comprising, initiate three layers of multicast trace route.
The embodiment of the invention also proposes the another kind of system that realizes that two or three layers of multicast trace route switch, and comprising:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
First hop router; Be used to receive the IGMP Tracert Request message that generates by said IGMP Tracert Query message; Judge whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option; If comprise; Then in said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node, regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then return three layers of multicast trace route response.
The embodiment of the invention also proposes another kind of router, comprising:
Receiver module is used to receive IGMP Tracert Request message;
Judge module is used for judging whether the IGMP Tracert Request message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module; Be used for when the judged result of judge module when comprising; In said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node; Regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers;
Return module, be used for when the judged result of judge module when not comprising, return three layers of multicast trace routes response.
It is thus clear that; Method, system and router that the embodiment of the invention proposes; Defined Layer 2 Multicast path trace IP option; Last-hop Router, or first hop router through whether comprising this Layer 2 Multicast path trace IP option in the message that judge to receive, can realize that the tracking of two or three layers of multicast is switched.
In sum, more than be merely displaying, but not be used to limit protection scope of the present invention spirit of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. method that realizes that two or three layers of multicast trace route switch is characterized in that said method comprises:
Inquiry unit judges whether to carry out the Layer 2 Multicast path trace, if then follow the tracks of in the inquiry IGMP Tracert Query message at Internet user's igmpinternet and add Layer 2 Multicast path trace IP option;
Last-hop Router receives IGMP Tracert Query message, judges whether said message comprises Layer 2 Multicast path trace IP option, if comprise, and the said IGMP Tracert of two node layer transparent transmissions Query message downstream then; If do not comprise, then upstream nodes is sent IGMP Tracert request Request message.
2. method according to claim 1 is characterized in that, the sequence number field of said Layer 2 Multicast path trace IP option is identical with the sequence number field of IP multicast trace route Traceroute option.
3. method that realizes that two or three layers of multicast trace route switch is characterized in that said method comprises:
Inquiry unit judges whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
First hop router receives the IGMP Tracert Request message that is generated by said IGMP Tracert Query message; Judge whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option; If comprise; Then in said IGMP Tracert Request message, increase Internet user's igmpinternet tracking response data block IGMP Tracert Response data of this node; Regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
4. method according to claim 3 is characterized in that, the sequence number field of said Layer 2 Multicast path trace IP option is identical with the sequence number field of IP multicast trace route Traceroute option.
5. system that realizes that two or three layers of multicast trace route switch is characterized in that said system comprises:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
Last-hop Router is used to receive IGMP Tracert Query message, judges whether said message comprises Layer 2 Multicast path trace IP option, if comprise, and the said IGMPTracert Query of two node layer transparent transmissions message downstream then; If do not comprise, then upstream nodes is sent IGMP Tracert Request message.
6. a router is characterized in that, said router comprises:
Receiver module is used to receive IGMP Tracert Query message;
Judge module is used for judging whether the IGMP Tracert Query message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module, be used for when the judged result of judge module when comprising, the said IGMP Tracert of two node layer transparent transmissions Query message downstream;
Initiation module, be used for when the judged result of judge module when not comprising, upstream nodes is sent IGMP Tracert Request message.
7. system that realizes that two or three layers of multicast trace route switch is characterized in that said system comprises:
Inquiry unit is used to judge whether to carry out the Layer 2 Multicast path trace, if then in IGMP Tracert Query message, add Layer 2 Multicast path trace IP option;
First hop router; Be used to receive the IGMP Tracert Request message that generates by said IGMP Tracert Query message; Judge whether said IGMP Tracert Request message comprises Layer 2 Multicast path trace IP option; If comprise; Then in said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node, regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers; If do not comprise, then the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
8. a router is characterized in that, said router comprises:
Receiver module is used to receive the IGMP Tracert Request message that is generated by IGMP Tracert Query message;
Judge module is used for judging whether the IGMP Tracert Request message that receiver module receives comprises Layer 2 Multicast path trace IP option;
The transparent transmission module; Be used for when the judged result of judge module when comprising; In said IGMP Tracert Request message, increase the IGMP Tracert Response data of this node; Regenerate IGMP Tracert Request message, the IGMP Tracert Request message that regenerates is sent to the upper reaches two node layers;
Return module, be used for when the judged result of judge module when not comprising, the response address of appointment sends IGMP Tracert Response message in said IGMP Tracert Request message.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100027013A CN101483582B (en) | 2008-01-09 | 2008-01-09 | Method, system and router for implementing second and third layer multicast trace route |
| EP08871136A EP2234344B1 (en) | 2008-01-09 | 2008-12-29 | Methods, system and routers for realizing switching between layer-2 and layer-3 multicast route tracing |
| PCT/CN2008/073823 WO2009089761A1 (en) | 2008-01-09 | 2008-12-29 | Method, system for realizing switching of multicast route tracking in second and third layers, and router |
| US12/831,638 US8442047B2 (en) | 2008-01-09 | 2010-07-07 | Method, system, router and apparatus for implementing switching between layer-2 multicast route tracing and layer-3 multicast route tracing |
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| CN2008100027013A CN101483582B (en) | 2008-01-09 | 2008-01-09 | Method, system and router for implementing second and third layer multicast trace route |
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| US8442047B2 (en) | 2008-01-09 | 2013-05-14 | Huawei Technologies Co., Ltd. | Method, system, router and apparatus for implementing switching between layer-2 multicast route tracing and layer-3 multicast route tracing |
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| CN103878829B (en) * | 2014-02-24 | 2015-08-05 | 江苏大学 | A kind of wooden boards molding machine clamping device |
| CN105591943B (en) * | 2014-10-22 | 2019-12-03 | 中兴通讯股份有限公司 | The method and system of user equipment progress multicast path tracking |
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