CN101777997A - Method and system for switching flow of network link - Google Patents
Method and system for switching flow of network link Download PDFInfo
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Abstract
The invention discloses a method for switching a flow of a multiple protocol label switching (MPLS) network link. The method comprises the following steps of: sending a reverse fault notice message to a head node by a tail node through a reverse link when a main link is faulty and the tail node cannot receive a detecting message sent by the head node, switching the flow into a spare link so as to transmit if the head node receives the reverse fault notice message, sending the detecting message of the link to the tail node by the main link before the flow is switched into the main link if the head node cannot receive the reverse fault notice message, and switching the flow to the main link so as to transmit if the head node receives a response message to the detecting message of the link sent by the tail node. The invention also discloses a system for switching the flow of the MPLS network link. The technical scheme of the invention can ensure that the flow can be correctly switched and protected on a network starting an MPLS OAM detecting function and can promote the reliability of the service transmission.
Description
Technical field
The present invention relates to the Operations, Administration and Maintenance field of multi-protocol label switching network, relate in particular to a kind of method and system of realizing that the network link flow switches.
Background technology
The operation of multiprotocol label switching; administer and maintain (MPLS OAM; Multi-Protocol LabelSwitching Operation Administration and Maintenance) be the defects detection mechanism that does not rely on any upper strata or lower floor fully that the MPLS layer provides; the purpose of MPLS OAM is for the user plane energy certification mark switching path (LSP at MPLS; Label Switch Path) connectedness; weigh the utilance of network and the performance of tolerance network; trigger protection is switched when defective or fault appear in link simultaneously; so that can provide professional according to service-level agreement (SLA, Service LevelAgreements) with client's signing.
Usually, operator plans and disposes the MPLS network according to client and the demand of self, and the MPLS network of deployment is transparent for the client of operator.
As shown in Figure 1, this is the networking diagram of a typical MPLS network, and operator configures two unidirectional forward static links---primary link LSP1, reserve link LSP2 on the good MPLS network of deployment, and a reverse unidirectional static link LSP3.By MPLS OAM agreement; the link protection assembly is set to 1+1,1: 1 or N: the protected mode of 1 (many public reverse link LSP3 of primary link); by link logic virtual interface, MPLS OAM can detect, confirms and orient the defect information that comes from MPLS layer network inside effectively apace.Under the performance index requirements condition with higher, at 1: 1 or N: 1 protected mode, MPLS OAM can be when defective takes place in primary link LSP1, LSP3 announces defective to head node by reverse link, and, in the MPLS network, guaranteed the interrupted transmission of data flow faster flow being switched on the reserve link LSP2 on the head node; Under reversing mode, after primary link LSP1 recovered link, MPLS OAM agreement switched to primary link LSP1 with flow from reserve link LSP2 again and transmit last time on head node.
MPLS OAM realization mechanism is that the connectedness of primary link is checked, head node sends on primary link by the detection of connectivity of operator's configuration transmission frequency/quick defects detection (CV/FFD, ConnectivityVerification/Fast Failure Detection) message is to tail node, if tail node does not receive the CV/FFD message in designated period, then agreement thinks that the connection of this primary link interrupts, this moment, tail node made up reverse preliminary warning notice (BDI according to detected error reason, Backward Defect Indication) message, reverse static link LSP3 by operator's configuration, the BDI message that makes up is sent to head node, after head node received BDI message on the self-reversal static link LSP3, agreement was carried out and flow is switched to reserve link LSP2 from primary link LSP1 is transmitted action; If head node does not receive the BDI message in designated period, exist primary link LSP1 not recover connected state and think that primary link LSP1 has recovered connected state, switch to the defective of primary link transmission.
According to existing MPLS OAM agreement, 1: 1 or N: in 1 the protected mode, the cooperation by primary link, reserve link and reverse link realizes that there is following several situation in link protection:
(1) primary link is normal, and reverse link is normal:
As shown in Figure 1, for disposing MPLS network shown in Figure 1, the connectivity of link of MPLS OAM agreement detects the tail node R4 on the chain linked to owner road transmission continuously on head node R1 of CV/FFD message, receives detection of connectivity CV/FFD message on the R4; If Last status primary link LSP1 has interrupted, then R4 sends the BDI notification packet continuously to head node; If R4 stops to send the BDI message to head node, head node does not receive the BDI message, and agreement is returned flow and switched to the primary link transmission by reserve link, realize MPLS
The link protection of OAM and flow return to be cut.
(2) primary link is normal, and reverse link interrupts:
As shown in Figure 2; for disposing MPLS network shown in Figure 2; the connectivity of link of MPLS OAM agreement detects the chain linked to owner road tail node R4 transmission continuously on head node R1 of CV/FFD message; when interrupting appears in primary link; because reverse link LSP3 interrupts; the BDI message that tail node R4 sends can't arrive head node, and the link protection of MPLS OAM is switched and will be lost efficacy.
(3) primary link interrupts, and reverse link is normal:
As shown in Figure 3; for disposing MPLS network shown in Figure 3; the connectivity of link of MPLS OAM agreement detects the chain linked to owner road tail node R4 transmission continuously on head node R1 of CV/FFD message; because primary link LSP1 interrupts; detecting primary link on R4 interrupts; R4 is last according to the defect information structure BDI message that detects; and by the reverse link LSP3 of configuration continuous be sent to head node; head node receives after this BDI message; flow is switched to reserve link LSP2 transmission from primary link LSP1, realize that the link protection of MPLS OAM and flow switch.
(4) primary link interrupts, and reverse link interrupts:
As shown in Figure 4, for disposing MPLS network shown in Figure 4, the connectivity of link of MPLS OAM agreement detects the chain linked to owner road tail node R4 transmission continuously on head node R1 of CV/FFD message, because primary link LSP1 interrupts, after detecting defective on the primary link tail node R4, R4 is last according to the defect information structure BDI message that detects, and by the reverse link LSP3 of configuration continuous be sent to head node, then this BDI message can not arrive on the head node R1 of primary link because reverse link LSP3 is in interruption this moment.On the MPLS network of disposing, the link protection of MPLS OAM will be lost efficacy, and R1 will be unreachable fully to the flow of R4, service disconnection.
As seen, link protection and flow handoff failure that (2) above kind and (4) kind situation have caused MPLS OAM can not satisfy the demand of operator.
Summary of the invention
In view of this; main purpose of the present invention is to provide a kind of method and system of realizing that the network link flow switches; guarantee that the flow that carries out MPLS OAM agreement after primary link recovers link again switches, guarantee flow correct switching and protection on the network of enabling MPLS OAM measuring ability.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method that realizes that the network link flow switches, comprising:
During primary link failure, tail node can not receive the detection messages that head node sends, described tail node sends reverse preliminary warning notice message by reverse link to described head node, if described head node is received described reverse preliminary warning notice message, flow is switched on the reserve link transmit;
When described head node can not receive described reverse preliminary warning notice message, flow is returned switch to primary link before, send the link detection message by described primary link to tail node earlier, if described head node is received the response message of the link detection message that tail node sends, flow returned switch to primary link and transmit.
In the such scheme, this method further comprises: if head node can not receive the response message of link detection message, flow still remains on the former reserve link and transmits.
In the such scheme, this method further comprises: the waiting-timeout time of configuration link probe messages on head node;
Accordingly, described head node receives that the response message of the link detection message that tail node sends is: head node is received the response message of the link detection message that tail node sends at waiting-timeout in the time.
In the said method, this method further comprises: when tail node was received the detection messages of head node transmission, tail node determined that primary link is a connected state.
In the said method, this method further comprises: head node is not received the response message of link detection message at waiting-timeout in the time, confirms that then the primary link that MPLS OAM detects still is in interrupt status, and flow still transmits on reserve link.
In the said method, described link detection message is the Forward Defect Indication message of expansion, and described expansion Forward Defect Indication message is: the value of Reserved attribute is set to 0x01 in the MPLS OAM agreement Forward Defect Indication message structure.
In the said method, the response message of described link detection message is the reverse preliminary warning notice message of expansion, and the reverse preliminary warning notice message of described expansion is: the value of Reserved attribute is set to 0x01 in the reverse preliminary warning notice message structure of MPLS OAM agreement.
The present invention also provides a kind of system that realizes that the network link flow switches, and comprising: head node, tail node; Wherein,
Head node when being used for primary link failure, after head node is received the reverse preliminary warning notice message that tail node sends, switching to flow on the reserve link and to transmit; Can not receive the reverse preliminary warning notice message that tail node sends, flow is returned switch to before the primary link, send the link detection message by primary link to tail node earlier; After receiving the response message of the link detection message that tail node sends, flow returned switch to primary link and transmit;
Tail node when being used for primary link failure, can not receive the detection messages that head node sends, and tail node sends reverse preliminary warning notice message by reverse link to head node; After tail node is received the link detection message of head node transmission, send the response message of link detection message.
In the such scheme, this system further comprises: configuration module, be positioned at head node, and be used for the waiting-timeout time in head node configuration link probe messages;
Described head node receives that the response message of the link detection message that tail node sends is: head node is received the response message of the link detection message that tail node sends at waiting-timeout in the time.
In the such scheme, described head node is not received the response message of link detection message at waiting-timeout in the time, confirms that then the primary link that MPLS OAM detects still is in interrupt status, and flow still transmits on reserve link.
The method and system that realization network link flow provided by the present invention switches; finish by the response message that sends link detection message and link detection message the connectedness of primary link is surveyed; after guaranteeing that primary link has recovered connected state; carry out the flow handover operation again; so; can guarantee flow correct switching and protection on the network of enabling MPLS OAM measuring ability, thereby improve reliability of service transmission.
Description of drawings
Fig. 1 is primary link and the normal networking schematic diagram of reverse link in the MPLS OAM network;
Fig. 2 is the networking schematic diagram that primary link is normal in the MPLS OAM network, reverse link interrupts;
Fig. 3 is primary link interruption, the normal networking schematic diagram of reverse link in the MPLS OAM network;
The networking schematic diagram that Fig. 4 interrupts for primary link in the MPLS OAM network and reverse link;
Fig. 5 realizes the schematic flow sheet of the method that the network link flow switches for the present invention;
Fig. 6 realizes the structural representation of the system that the network link flow switches for the present invention.
Embodiment
Basic thought of the present invention is: when stopping to receive reverse preliminary warning notice message, by from MPLS
The head node of the primary link that OAM detects sends the link detection message to tail node, primary link is carried out connectedness survey, thereby guarantee that carrying out flow again after primary link recovers normally switches.
Wherein, described link detection message is the Forward Defect Indication message of expansion; Accordingly, the response message of described link detection message is the reverse preliminary warning notice message of expansion.
Below by drawings and the specific embodiments the present invention is described in further detail again.
Fig. 5 is the schematic flow sheet that the present invention realizes the method that the network link flow switches, and as shown in Figure 5, the present invention realizes that the method that the network link flow switches may further comprise the steps:
Step 501, the waiting-timeout time of configuration link probe messages;
Concrete, the user increases configuration item detecTime by configuration order on the head node of the primary link that MPLS OAM detects, and this configuration item is the waiting-timeout time of link detection message, and this waiting-timeout time is unit with the millisecond;
Step 502, head node sends detection messages to tail node;
Concrete, the head node of the primary link that MPLS OAM detects sends the CV/FFD message by the primary link that MPLS OAM detects to the tail node cycle, and the cycle of transmission is that the order according to the user is provided with, and can specify the cycle that sends in the order;
Step 503, during primary link failure, tail node can not receive the detection messages that head node sends, and tail node sends reverse preliminary warning notice message by reverse link to head node;
Concrete, if the tail node of the primary link that MPLS OAM detects is received the CV/FFD message that the head node cycle sends, then tail node determines that primary link is in connected state, tail node is not taked any action; When primary link breaks down, if the tail node of the primary link that MPLS OAM detects does not receive the CV/FFD message that the head node cycle sends in designated period, then tail node determines that primary link is an interrupt status, the tail node of the primary link that MPLS OAM detects sends reverse preliminary warning notice message by reverse link to head node, the transmission cycle is 1 second, informs that the state of the primary link that the head node MPLS OAM of the primary link that MPLS OAM detects detects occurs unusual; Designated period is provided with by the user, and the message receiving cycle that is provided with on the head node of the primary link that MPLS OAM detects and tail node is identical;
Step 504 if head node is received reverse preliminary warning notice message, then switches to flow on the reserve link and transmits;
Concrete, if the head node of the primary link that MPLS OAM detects receives the reverse preliminary warning notice message that tail node sends, the head node of the primary link that MPLS OAM detects triggers MPLS OAM agreement, and the flow of the primary link that MPLS OAM is detected switches on the reserve link that MPLS OAM detects and transmits;
When step 505, head node can not receive reverse preliminary warning notice message, flow is returned switch to primary link before, send the link detection message by primary link to tail node earlier;
Concrete, the head node of the primary link that detects as MPLS OAM does not receive the reverse preliminary warning notice message that the tail node of the primary link that detects from MPLS OAM sends by reverse link in three transmission cycles, then the head node of the primary link that detects of MPLS OAM confirms that the primary link that MPLS OAM detects reverts to connected state by interrupt status; Cause the reason of the reverse preliminary warning notice message that the head node of the primary link that MPLS OAM detects do not receive the primary link that detects from MPLS OAM in three transmission cycles tail node sends by reverse link to have two: the first, the primary link that MPLS OAM detects recovers connected state; It two is that the reverse link that MPLS OAM detects is an interrupt status;
Just in order to guarantee the state of the primary link that MPLS OAM detects is that connected state carries out flow and returns and cut, the present invention is after the head node of the primary link that MPLS OAM detects confirms that the primary link of MPLS OAM detection reverts to connected state by interrupt status, the head node of the primary link that is detected by MPLS OAM starts link detection mechanism, and promptly the head node of the primary link that detects of MPLS OAM sends the link detection message by the primary link that MPLS OAM detects to tail node; Wherein, the link detection message is the Forward Defect Indication message of expansion, and expansion Forward Defect Indication method of message is: the value of Reserved attribute is set to the 0x01 value in the structure of the Forward Defect Indication message in the MPLS OAM agreement MPLA OAM agreement;
Step 506 if head node receives the response message of the link detection message that tail node sends, realizes that link returns to cut, and flow is returned switch to primary link and transmit;
Concrete, if the tail node of the primary link that MPLS OAM detects receives the link detection message that head node sends, just the primary link that detects by MPLS OAM sends to the response message of link detection message the head node of the primary link of MPLS OAM detection; The response message of link detection message is the reverse preliminary warning notice message of expansion, expanding reverse preliminary warning notice method of message is: the value of Reserved attribute is set to the 0x01 value in the structure of the reverse preliminary warning notice message in the MPLS OAM agreement MPLA OAM agreement, is used to distinguish reverse preliminary warning notice message;
If the head node of the primary link that MPLS OAM detects is received the response message of link detection message at the waiting-timeout of link detection message in the time, the head node of the primary link that MPLS OAM detects confirms that then the primary link that MPLS OAM detects has recovered connected state, realize then that link returns and cut that the head node of the primary link that MPLS OAM detects triggers MPLS OAM agreement detects flow from MPLS OAM reserve link and returns and switch to the primary link that MPLS OAM detects and transmit; If the head node of the primary link that MPLS OAM detects is not received the response message of link detection message at the waiting-timeout of link detection message in the time; then the head node of the primary link of MPLS OAM detection confirms that the primary link that MPLS OAM detects still is in interrupt status; the failure of then protection group, flow still transmits on the reserve link that MPLS OAM detects.
In order to realize said method, the present invention also provides a kind of system that realizes that the network link flow switches, and Fig. 6 is a structural representation of realizing the system of network link flow switching, and as shown in Figure 6, this system comprises: head node 61, tail node 62, wherein,
Head node 61, when being used for primary link failure, after head node 61 was received the reverse preliminary warning notice message that tail node 62 sends, the flow that triggers the primary link that MPLS OAM agreement detects MPLS OAM switched on the reserve link that MPLS OAM detects and transmits; Be used for when the reverse preliminary warning notice message that can not receive that tail node sends, flow is returned switch to before the primary link, send the link detection messages by primary link to tail node 62 earlier; Be used for behind the response message of receiving the link detection message that tail node 62 sends, realize that link returns to cut, the flow that triggers the reserve link that MPLS OAM agreement detects MPLS OAM returns and switches to the primary link that MPLSOAM detects and transmit;
Here, the link detection message is the Forward Defect Indication message of expansion, and expansion Forward Defect Indication method of message is: the value of Reserved attribute is set to the 0x01 value in the structure of the Forward Defect Indication message in the MPLS OAM agreement MPLAOAM agreement;
Head node 61 can also be further used for sending detection messages to tail node 62;
Tail node 62 when being used for primary link failure, can not receive the detection messages that head node sends, and tail node 62 sends reverse preliminary warning notice message by reverse link to head node 61; Be used for after tail node 62 is received the link detection message of head node 61 transmissions, send the response message of link detection messages to head node 61;
Here, the response message of link detection message is the reverse preliminary warning notice message of expansion, expanding reverse preliminary warning notice method of message is: the value of Reserved attribute is set to the 0x01 value in the structure of the reverse preliminary warning notice message in the MPLS OAM agreement MPLA OAM agreement, is used to distinguish reverse preliminary warning notice message.
Head node 61 can further include:
Configuration module 611 is used for the waiting-timeout time in head node 61 configuration link probe messages;
Head node 61 receives that the response message of the link detection message that tail node 62 sends is: head node 61 is received the response message of the link detection message that tail node 62 sends at waiting-timeout in the time, confirm that then the primary link that MPLS OAM detects still is in interrupt status, flow still transmits on reserve link.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. method that realizes that the network link flow switches is characterized in that this method comprises:
During primary link failure, tail node can not receive the detection messages that head node sends, described tail node sends reverse preliminary warning notice message by reverse link to described head node, if described head node is received described reverse preliminary warning notice message, flow is switched on the reserve link transmit;
When described head node can not receive described reverse preliminary warning notice message, flow is returned switch to primary link before, send the link detection message by described primary link to tail node earlier, if described head node is received the response message of the link detection message that tail node sends, flow returned switch to primary link and transmit.
2. method according to claim 1 is characterized in that, this method also comprises: if head node can not receive the response message of link detection message, flow still remains on the former reserve link and transmits.
3. method according to claim 1 is characterized in that, this method also comprises: the waiting-timeout time of configuration link probe messages on head node;
Accordingly, described head node receives that the response message of the link detection message that tail node sends is: head node is received the response message of the link detection message that tail node sends at waiting-timeout in the time.
4. method according to claim 1 is characterized in that, this method also comprises: when tail node was received the detection messages of head node transmission, tail node determined that primary link is a connected state.
5. method according to claim 3, it is characterized in that, this method also comprises: head node is not received the response message of link detection message at waiting-timeout in the time, confirms that then the primary link that MPLS OAM detects still is in interrupt status, and flow still transmits on reserve link.
6. method according to claim 1, it is characterized in that, described link detection message is the Forward Defect Indication message of expansion, and described expansion Forward Defect Indication message is: the value of Reserved attribute is set to 0x01 in the MPLS OAM agreement Forward Defect Indication message structure.
7. method according to claim 6, it is characterized in that, the response message of described link detection message is the reverse preliminary warning notice message of expansion, and the reverse preliminary warning notice message of described expansion is: the value of Reserved attribute is set to 0x01 in the reverse preliminary warning notice message structure of MPLS OAM agreement.
8. a system that realizes that the network link flow switches is characterized in that this system comprises: head node, tail node; Wherein,
Head node when being used for primary link failure, after head node is received the reverse preliminary warning notice message that tail node sends, switching to flow on the reserve link and to transmit; Can not receive the reverse preliminary warning notice message that tail node sends, flow is returned switch to before the primary link, send the link detection message by primary link to tail node earlier; After receiving the response message of the link detection message that tail node sends, flow returned switch to primary link and transmit;
Tail node when being used for primary link failure, can not receive the detection messages that head node sends, and tail node sends reverse preliminary warning notice message by reverse link to head node; After tail node is received the link detection message of head node transmission, send the response message of link detection message.
9. system according to claim 8 is characterized in that, this system also comprises: configuration module, be positioned at head node, and be used for the waiting-timeout time in head node configuration link probe messages;
Described head node receives that the response message of the link detection message that tail node sends is: head node is received the response message of the link detection message that tail node sends at waiting-timeout in the time.
10. system according to claim 9, it is characterized in that, described head node is not received the response message of link detection message at waiting-timeout in the time, confirm that then the primary link that MPLS OAM detects still is in interrupt status, and flow still transmits on reserve link.
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