CN103546376A - Response message transmission method and node - Google Patents
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- CN103546376A CN103546376A CN201210235576.7A CN201210235576A CN103546376A CN 103546376 A CN103546376 A CN 103546376A CN 201210235576 A CN201210235576 A CN 201210235576A CN 103546376 A CN103546376 A CN 103546376A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/26—Route discovery packet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
Disclosed are a response message transmission method and a node. The method includes that after receiving a request message sent by an end node, if being judged to have no return path or IP (internet protocol) routing capacity, an intermediate node forwards a generated response message along a forward path backwards. The node is applied in the process of transmission of the response message, and when serving as the intermediate node, the node comprises a message receiving module, a message generating module and a message sending module, the message receiving module is used for receiving the request message sent by the end node, the message generating module is used for generating the response message corresponding to the request message, and the message sending module is used for forwarding the response message generated by the message generating module along the forward path backwards when the node is judged to have no return path or IP routing capacity. By adopting the method and the node, functions of On-demand CV, Router Tracing and the like can be realized on a one-way path when an association two-way path or the end node has a return path for the convenience of performing fault positioning and discovering and collecting of information like topology or states.
Description
Technical field
The present invention relates to OAM (the Operation Administration and Maintenance in unidirectional path that associated two-way approach or end node have reverse path, operation management maintain) functional area, relates in particular to a kind of transfer approach and node of response message.
Background technology
For current MPLS (Multi-Protocol Label Switching, multiprotocol label switching) transmit network, have two kinds of two-way approaches, a kind of is on forward path and reverse path, to have identical node and link, as shown in Figure 1, its forward path is A-B-C-D, and reverse path is D-C-B-A, another kind is associated two-way approach (Association Bidirectional Path), namely except two end nodes or two end nodes and part intermediate node are forward is identical with reverse path, there is not same section in other intermediate nodes and link, as shown in Figure 2, its forward path is A-B-C-D, and reverse path is D-E-F-A, this will cause node A or node D when realizing On-demand CV (connectivity verification as required) and Router Tracing (route tracking) function, cause is at intermediate node B, C or E, F is without IP routing capabilities and reverse path, Echo request (echo request) message that can not send over node A or node D is replied, thereby can not realize this function.And at current RFC (Request For Comments, suggestion is solicited) regulation in 6426, when certain node is not supported IP routing capabilities and during without return path, directly abandon the Echo request message receiving, do not send any response message (Echo reply, echo is replied), thus cannot realize the functions such as the On-demand CV of intermediate node and Router tracing.
Summary of the invention
The object of the present invention is to provide a kind of transfer approach and node of response message, to overcome in prior art at intermediate node without return path and IP routing capabilities in the situation that, cannot realize the defect of the functions such as On-demand CV in the unidirectional path that associated two-way approach or end node have reverse path and Router tracing.
For addressing the above problem, the invention provides a kind of transfer approach of response message, comprising:
After receiving the request message that end node sends, self there is not return path or IP routing capabilities if judge in intermediate node, the response message of generation is forwarded backward along forward path.
Further,
The described response message by generation forwards backward along forward path, specifically comprises:
Generate described response message, in described response message, set a forwarding and identify and be set to after particular value, described response message is forwarded backward along forward path; Wherein, the forwarding sign that is set to particular value is used to indicate other nodes that possess reverse transfer capability and the described response message receiving is transmitted to the transmit leg end node of described request message.
Correspondingly, the present invention also provides a kind of transfer approach of response message, comprising:
End node is after receiving the response message that intermediate node sends, as described in judging, the destination address of response message is not this address of node, along return path, described response message is forwarded.
Further, described method also comprises:
Described end node, if the destination address of response message as described in judging is this address of node, carries out respective handling.
Further,
The described destination address as response message as described in judging is not this node, along return path, described response message is forwarded, and specifically comprises:
Described end node as the destination address of response message as described in judging be not this address of node, and the forwarding of carrying in described response message sign is set to particular value, along return path, described response message forwarded.
Further, described method also comprises:
Described end node as the destination address of response message as described in judging be not this address of node, and the described forwarding sign of carrying in described response message is set to other values except described particular value, described response message abandoned.
Correspondingly, the present invention also provides a kind of transfer approach of response message, comprising:
Intermediate node is after receiving the response message that other nodes send, as described in judging, the destination address of response message is not this address of node, and by described response message, the return path by this node forwards backward.
Further,
The described destination address as response message as described in judging is not this node, and by described response message, the return path by this node forwards backward, specifically comprises:
Described intermediate node as the destination address of response message as described in judging be not this address of node, and the forwarding of carrying in described response message sign is set to particular value, by described response message, the return path by this node forwards backward.
Correspondingly, the present invention also provides a kind of node, is applied in the transport process of response message, at described node, during as intermediate node, comprising:
Message receiver module, the request message of sending for receiving terminal node;
Message generation module, for generating the response message corresponding with described request message;
Message sending module, for when judging this node and do not have return path or IP routing capabilities, the described response message that described message generation module is generated forwards backward along forward path.
Further,
Described message generation module, generates the response message corresponding with described request message, specifically comprises:
Described message generation module, for when judging this node and do not have return path or IP routing capabilities, generates described response message, sets a forwarding and identify and be set to particular value in described response message; Wherein, the forwarding sign that is set to particular value is used to indicate other nodes that possess reverse transfer capability and the described response message receiving is transmitted to the transmit leg end node of described request message.
Further,
Described message receiver module is at described node during as end node, the response message of also sending for receiving intermediate node;
Described message sending module is at described node during as end node, and also, for not being this address of node as the destination address of response message as described in judging, the described response message along return path, described message receiver module being received forwards.
Further, at described node, during as end node, also comprise:
Message processing module (MPM), while being this address of node for the destination address judging the described response message that described message receiver module receives, carries out respective handling to described response message.
Further,
Described message sending module is not also for being this node as the destination address of response message as described in judging, and the described response message along return path, described message receiver module being received forwards, and specifically comprises:
Described message sending module is not also this address of node for the destination address of response message as described in receiving as message receiver module as described in judging, and the forwarding of carrying in described response message sign is set to particular value, and the described response message along return path, described message receiver module being received forwards.
Further, at described node, during as end node, also comprise:
Message processing module (MPM), for the destination address judging the described response message that described message receiver module receives, it not this address of node, and when the described forwarding sign of carrying in the described response message that described message receiver module receives is set to other values except described particular value, the described response message that described message receiver module is received abandons.
Further,
Message receiver module is also for during as intermediate node, receiving the response message that other nodes are sent at described node;
Message sending module is also at described node during as intermediate node, as the destination address of response message is not this address of node as described in as described in judging, message receiver module receives, the described response message described message receiver module being received forwards backward by the return path of this node.
Further,
Described message sending module is also at described node during as intermediate node, as described in judging, the destination address of response message is not this node, and by described response message, the return path by this node forwards backward, specifically comprises:
Described message sending module is also at described node during as intermediate node, as as described in judging, the destination address of response message is not this address of node, and the forwarding of carrying in described response message sign is set to particular value, and by described response message, the return path by this node forwards backward.
Adopt after the present invention, can on associated two-way approach or end node have the unidirectional path of reverse path, realize the functions such as On-demand CV and Router Tracing, to carry out discovery and the collection of the information such as fault location and topology or state.
Accompanying drawing explanation
Fig. 1 is total to the two-way approach schematic diagram in path in prior art;
Fig. 2 is associated two-way approach schematic diagram in prior art;
Fig. 3 is the flow chart of a kind of transfer approach of response message in the embodiment of the present invention;
Fig. 4 is response message forward repeating process schematic diagram in the embodiment of the present invention;
Fig. 5 carries out by intermediate node the repeating process schematic diagram that response message returns in the embodiment of the present invention;
Fig. 6 is that the structure of node in the embodiment of the present invention forms schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
In the present embodiment, as shown in Figure 3, a kind of transfer approach of response message, comprising:
Step 10, intermediate node are after receiving the Echo request message that end node sends, if judging this node does not possess IP routing capabilities or does not have return path, in the Echo reply message generating, arrange one and forward after sign, this Echo reply message is forwarded backward along forward path; Wherein, this forwarding sign is used for representing that this Echo reply message need to be transmitted to above-mentioned end node by other nodes;
End node on step 20, this path is after the Echo reply message receiving with above-mentioned forwarding sign, as the destination address of judging this message is not this address of node, along return path, this message repeating is gone out; As the destination address of judging this message is this address of node, carry out respective handling, to carry out fault location and topology information on forward path, find;
Intermediate node on step 30, this path, after the Echo reply message receiving with above-mentioned forwarding sign, as is judged this node and is had return path, and by this message, the return path by this node forwards backward; Otherwise, this message is continued to forward along forward path.
It should be noted that, above-mentioned steps 20 and 30 does not represent the execution sequence of node reality, and with each node, the sequence in path is as the criterion actual execution sequence.
Particularly, said method comprises:
1, by LSP (Label Switching Path, label switched path) or PW (Pseudo-Wire, pseudo-line) two end nodes in path carry out On-demand CV and Router tracing function when enabling or starting to this path, this end node sends Echo Request message along forward path direction to each node, to carry out the discovery of fault location and topology information;
2, when requested intermediate node receives after the Echo request message that end node sends over, analyze and process operation, judge self whether have return path or IP routing capabilities;
If 3 judge when there is no direct return path and not possessing IP routing capabilities, in the Echo reply message generating, a reserved sign bit identifies the intermediate node that whether needs forward end node or have return path and carries out forward process, then this Echo reply message is continued to forward backward along forward path, until arrive forward end node or there is the intermediate node of return path;
4, when thering is the intermediate node of return path, receive after the Echo reply message that other intermediate nodes send over, analyze, as judged and need this section to name a person for a particular job this message repeating to opposite end source node according to the value of the sign bit wherein setting, by its return path, this Echo reply is forwarded in the past; As forward end node receives this Echo reply message, and to judge the entrained destination address of this Echo reply message be not this address of node,, by its reverse return path, this Echo reply message repeating gone over;
5,, when opposite end source node receives from return path Echo Reply, according to whether receiving the Echo Reply that each intermediate node returns, can carry out fault location and the topology information of respective nodes on forward path and find.
The associated two-way approach shown in Fig. 4 of take is example, realizes the method that response message is processed in associated two-way approach or unidirectional path, comprising:
1, by end node A in associated two-way approach or unidirectional path at On-demand CV or Router tracing function on or enable in situation, along forward path direction, by TTL (Time To Live, life span) mode, successively Echo request is sent to B, C, each node device of D;
2, Node B, C, D receive the Echo Request message sending over from node A, analyze respectively and process, and judge whether this node exists direct return path or IP routing capabilities; In this example, owing to all there is not return path or IP routing capabilities in Node B and C, generate respectively the Echo Reply message of expansion, set a sign bit T, and the value of T is set to 1, the peer node that indicates forward forwards this Echo Reply message, then continues, along this forward path, this Echo Reply message is forwarded to transmission, until arrive the end node D on forward path;
3, when the end node D of forward path receives after the Echo Reply message of the expansion that Node B and node C send over from this forward path, process and analyze; When analyzing, to have T=1 or destination address be not this node address,, by the return path D-E-F-A binding with this forward path, the Echo Reply message of this expansion sent on peer node A;
4, source node A receives the expansion Echo Reply message sending over from return path (D-E-F-A), whether analyze destination address on this Echo Reply is this node, if so, this message is processed, carried out the discovery of fault location and topology information; Otherwise, judge that the value of whether carrying sign bit T and T in this message equals 1, if so, forwards this Echo Reply message by reverse path; When the value of judging T is during for other values except 1 (as T=0), directly carry out discard processing.
The associated two-way approach shown in Fig. 5 of take is example, realizes the method that response message is processed in associated two-way approach or unidirectional path, comprising:
1, by end node A in associated two-way approach or unidirectional path at On-demand CV or Router tracing function on or enable in situation, along forward path direction, by TTL mode, successively Echo request is sent to B, C, each node device of D;
2, Node B, C, D receive the Echo Request message sending over from node A, analyze respectively and process, and judge whether this node exists direct return path or IP routing capabilities; In this example, because Node B does not exist return path or IP routing capabilities, generate the Echo Reply message of expansion, set a sign bit T, and the value of T is set to 1, the peer node or other intermediate nodes that indicate forward forward this Echo Reply message, then continue, along this forward path, this EchoReply message is forwarded to transmission, arrive node C; Owing to all there is return path in node C and D, thus can be directly by the Echo Reply message of generation, the return path by is separately forwarded to node A;
3, when node C receives after the Echo Reply message of the expansion that Node B sends over from this forward path, process and analyze; When analyzing while there is T=1,, by the return path C-E-A binding with this forward path, the Echo Reply message of this expansion is sent on peer node A;
4, source node A receives the expansion Echo Reply message of the Node B generation sending over from return path (C-E-A), whether analyze destination address on this Echo Reply is this node, if so, this message is processed, carried out the discovery of fault location and topology information; Otherwise, judge that the value of whether carrying sign bit T and T in this message equals 1, if so, forwards this Echo Reply message by reverse path; When the value of judging T is during for other values except 1 (as T=0), directly carry out discard processing.
In the present embodiment, the transfer approach of another response message, comprising:
Step 10, intermediate node, after receiving the Echo request message that end node sends, do not possess IP routing capabilities or do not have return path if judge this node, the Echo reply message of generation are forwarded backward along forward path;
End node on step 20, this path is after receiving Echo reply message, as the destination address of judging this message is not this address of node, along return path, this message repeating is gone out; As the destination address of judging this message is this node, carry out respective handling, to carry out fault location and topology information on forward path, find.
Can find out, this method is a kind of simplification to said method, only need the Echo reply message that end node is not this address of node to destination address to forward along return path, intermediate node is after receiving the Echo reply message that other nodes are sent, without message is carried out to analysis judgment, directly along current path, forward forward.
As shown in Figure 6, the node described in the present embodiment is applied in the transport process of response message, mainly comprises following three modules during as intermediate node:
Message receiver module, the request message of sending for receiving terminal node;
Message generation module, for generating the response message corresponding with described request message;
Message sending module, for when judging this node and do not have return path or IP routing capabilities, the described response message that described message generation module is generated forwards backward along forward path.
Preferably,
Described message generation module, generates the response message corresponding with described request message, specifically comprises:
Described message generation module, for when judging this node and do not have return path or IP routing capabilities, generates described response message, sets a forwarding and identify and be set to particular value in described response message; Wherein, the forwarding sign that is set to particular value is used to indicate other nodes that possess reverse transfer capability and the described response message receiving is transmitted to the transmit leg end node of described request message.
Preferably,
Described message receiver module is at described node during as end node, the response message of also sending for receiving intermediate node;
Described message sending module is at described node during as end node, and also, for not being this address of node as the destination address of response message as described in judging, the described response message along return path, described message receiver module being received forwards.
Preferably, at described node, during as end node, also comprise:
Message processing module (MPM), while being this address of node for the destination address judging the described response message that described message receiver module receives, carries out respective handling to described response message.
Preferably,
Described message sending module is not also for being this node as the destination address of response message as described in judging, and the described response message along return path, described message receiver module being received forwards, and specifically comprises:
Described message sending module is not also this address of node for the destination address of response message as described in receiving as message receiver module as described in judging, and the forwarding of carrying in described response message sign is set to particular value, and the described response message along return path, described message receiver module being received forwards.
Preferably, at described node, during as end node, also comprise:
Message processing module (MPM), for the destination address judging the described response message that described message receiver module receives, it not this address of node, and when the described forwarding sign of carrying in the described response message that described message receiver module receives is set to other values except described particular value, the described response message that described message receiver module is received abandons.
Preferably,
Message receiver module is also for during as intermediate node, receiving the response message that other nodes are sent at described node;
Message sending module is also at described node during as intermediate node, as the destination address of response message is not this address of node as described in as described in judging, message receiver module receives, the described response message described message receiver module being received forwards backward by the return path of this node.
Preferably,
Described message sending module is also at described node during as intermediate node, as described in judging, the destination address of response message is not this node, and by described response message, the return path by this node forwards backward, specifically comprises:
Described message sending module is also at described node during as intermediate node, as as described in judging, the destination address of response message is not this address of node, and the forwarding of carrying in described response message sign is set to particular value, and by described response message, the return path by this node forwards backward.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also can there be other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (16)
1. a transfer approach for response message, comprising:
After receiving the request message that end node sends, self there is not return path or IP routing capabilities if judge in intermediate node, the response message of generation is forwarded backward along forward path.
2. the method for claim 1, is characterized in that:
The described response message by generation forwards backward along forward path, specifically comprises:
Generate described response message, in described response message, set a forwarding and identify and be set to after particular value, described response message is forwarded backward along forward path; Wherein, the forwarding sign that is set to particular value is used to indicate other nodes that possess reverse transfer capability and the described response message receiving is transmitted to the transmit leg end node of described request message.
3. a transfer approach for response message, comprising:
End node is after receiving the response message that intermediate node sends, as described in judging, the destination address of response message is not this address of node, along return path, described response message is forwarded.
4. method as claimed in claim 3, is characterized in that, also comprises:
Described end node, if the destination address of response message as described in judging is this address of node, carries out respective handling.
5. the method as described in claim 3 or 4, is characterized in that:
The described destination address as response message as described in judging is not this node, along return path, described response message is forwarded, and specifically comprises:
Described end node as the destination address of response message as described in judging be not this address of node, and the forwarding of carrying in described response message sign is set to particular value, along return path, described response message forwarded.
6. method as claimed in claim 5, is characterized in that, also comprises:
Described end node as the destination address of response message as described in judging be not this address of node, and the described forwarding sign of carrying in described response message is set to other values except described particular value, described response message abandoned.
7. a transfer approach for response message, comprising:
Intermediate node is after receiving the response message that other nodes send, as described in judging, the destination address of response message is not this address of node, and by described response message, the return path by this node forwards backward.
8. method as claimed in claim 7, is further characterized in that:
The described destination address as response message as described in judging is not this node, and by described response message, the return path by this node forwards backward, specifically comprises:
Described intermediate node as the destination address of response message as described in judging be not this address of node, and the forwarding of carrying in described response message sign is set to particular value, by described response message, the return path by this node forwards backward.
9. a node, is applied in the transport process of response message, at described node, during as intermediate node, comprising:
Message receiver module, the request message of sending for receiving terminal node;
Message generation module, for generating the response message corresponding with described request message;
Message sending module, for when judging this node and do not have return path or IP routing capabilities, the described response message that described message generation module is generated forwards backward along forward path.
10. node as claimed in claim 9, is characterized in that:
Described message generation module, generates the response message corresponding with described request message, specifically comprises:
Described message generation module, for when judging this node and do not have return path or IP routing capabilities, generates described response message, sets a forwarding and identify and be set to particular value in described response message; Wherein, the forwarding sign that is set to particular value is used to indicate other nodes that possess reverse transfer capability and the described response message receiving is transmitted to the transmit leg end node of described request message.
11. nodes as described in claim 9 or 10, is characterized in that:
Described message receiver module is at described node during as end node, the response message of also sending for receiving intermediate node;
Described message sending module is at described node during as end node, and also, for not being this address of node as the destination address of response message as described in judging, the described response message along return path, described message receiver module being received forwards.
12. nodes as claimed in claim 11, is characterized in that, at described node, during as end node, also comprise:
Message processing module (MPM), while being this address of node for the destination address judging the described response message that described message receiver module receives, carries out respective handling to described response message.
13. nodes as claimed in claim 11, is characterized in that:
Described message sending module is not also for being this node as the destination address of response message as described in judging, and the described response message along return path, described message receiver module being received forwards, and specifically comprises:
Described message sending module is not also this address of node for the destination address of response message as described in receiving as message receiver module as described in judging, and the forwarding of carrying in described response message sign is set to particular value, and the described response message along return path, described message receiver module being received forwards.
14. nodes as described in claim 12 or 13, is characterized in that, at described node, during as end node, also comprise:
Message processing module (MPM), for the destination address judging the described response message that described message receiver module receives, it not this address of node, and when the described forwarding sign of carrying in the described response message that described message receiver module receives is set to other values except described particular value, the described response message that described message receiver module is received abandons.
15. nodes as claimed in claim 9, is characterized in that:
Message receiver module is also for during as intermediate node, receiving the response message that other nodes are sent at described node;
Message sending module is also at described node during as intermediate node, as the destination address of response message is not this address of node as described in as described in judging, message receiver module receives, the described response message described message receiver module being received forwards backward by the return path of this node.
16. nodes as claimed in claim 15, are further characterized in that:
Described message sending module is also at described node during as intermediate node, as described in judging, the destination address of response message is not this node, and by described response message, the return path by this node forwards backward, specifically comprises:
Described message sending module is also at described node during as intermediate node, as as described in judging, the destination address of response message is not this address of node, and the forwarding of carrying in described response message sign is set to particular value, and by described response message, the return path by this node forwards backward.
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| CN201210235576.7A CN103546376B (en) | 2012-07-09 | 2012-07-09 | A kind of transfer approach and node of response message |
| PCT/CN2013/077860 WO2013185650A1 (en) | 2012-07-09 | 2013-06-25 | Reply message transmission method and node |
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| CN105634937A (en) * | 2015-12-31 | 2016-06-01 | 华为技术有限公司 | Processing method and device of message |
| CN109120657A (en) * | 2017-06-23 | 2019-01-01 | 中兴通讯股份有限公司 | A kind of business collocation method and node |
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| CN112104557B (en) * | 2020-08-27 | 2022-10-21 | 新华三技术有限公司 | Method and device for detecting link |
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| WO2017113771A1 (en) * | 2015-12-31 | 2017-07-06 | 华为技术有限公司 | Packet processing method and device |
| CN105634937B (en) * | 2015-12-31 | 2019-03-26 | 华为技术有限公司 | A kind for the treatment of method and apparatus of message |
| CN109120657A (en) * | 2017-06-23 | 2019-01-01 | 中兴通讯股份有限公司 | A kind of business collocation method and node |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013185650A1 (en) | 2013-12-19 |
| CN103546376B (en) | 2019-07-30 |
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