CN101789879A - Dynamic maintenance method and device for related link circuits - Google Patents
Dynamic maintenance method and device for related link circuits Download PDFInfo
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- CN101789879A CN101789879A CN 200910244541 CN200910244541A CN101789879A CN 101789879 A CN101789879 A CN 101789879A CN 200910244541 CN200910244541 CN 200910244541 CN 200910244541 A CN200910244541 A CN 200910244541A CN 101789879 A CN101789879 A CN 101789879A
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Abstract
The invention discloses a dynamic maintenance method for related link circuits. The method comprises the following steps: establishing a mapping relation of a determining link circuit and a determined link circuit, and generating a determining link circuit alarm when the detection configuration of the determining link circuit detects the fault of the determining link circuit; switching service flow to a backup protection link circuit; informing the detection configuration of the determined link circuit to update forwarded parameters according to the mapping relationship; and updating the own forwarded parameters through the detection configuration of the determined link circuit. The invention also discloses a dynamic maintenance device for the related link circuits. When the service flow is switched to the backup protection link circuit of the determining link circuit, the detection configuration of the determined link circuit do not give alarms, and the determined link circuit is not switched, thereby being capable of ensuring the normal forwarded service flow on the backup protection link circuit.
Description
Technical field
The present invention relates to the link maintenance technology in the ethernet communication, relate in particular to a kind of dynamic maintaining method and device of related link circuits.
Background technology
High speed development along with the internet, the proposition of carrier class ethernet communication quality requirement, stability and reliability requirement for network link are more and more higher, variation requirement for conversion link state at all levels can respond fast, and requirement can be in 50ms switch to backup link with business and recovers service communication.But, in the topological structure of some multi-level lattice nesting protection, switched, and the pseudo-wired link of the forwarding of internal layer does not need to switch as outer layer tunnel, just the retransmitting paramater of outer layer tunnel upgrades and gets final product.
At present, the topological structure that has the conversion link of similar many levels in the communication network application networking, usually high-level link is based on the conversion link of low level, as VPN (virtual private network) (VPN in the telecommunications networking, Virtual Private Network) business belongs to high-level, be based on the public network tunnel of low level, the conversion link state of this low level changes or transmits fault, can have influence on the forwarding of high-level link.As shown in Figure 1, public network tunnel links PE1-P2-PE3 in the network topology breaks down, the vpn service stream that then is carried on this tunnel also claims pseudo-line to interrupt, but, if public network tunnel links PE1-P2-PE3 has the protection link PE1-P4-PE3 of backup, then be carried on the vpn service stream on the PE1-P2-PE3, just can switch to backup tunnel link PE1-P4-PE3 immediately and go up and can not interrupt; If public network tunnel links PE1-P2-PE3 does not have configuration protection backup link PE1-P4-PE3, and there is the pseudo-line of backup in vpn service stream, also can switch on the pseudo-line of backup, as switch on the PE1-P4-PE5 among Fig. 1.
In order to accomplish that carrier-class network service requirement all has corresponding forwarding detection (BFD) method on the link of each level, on the public network tunnel, chain circuit detecting method is arranged, as: two-way forwarding detects (BFD, BidirectionalForwarding Detection), ethernet operation management maintenance technology (ETH-OAMEthemet Operation, Administration and Maintenance), transmit multiprotocol label switching operation management maintain technology (TMPLS-OAM, Transport Multi-Protocol Label Switching Operation, Administra-tion and Maintenance) method such as; On pseudo-line (PW, the Pseudo Wire) level of VPN just like detection methods such as BFD.Like this; in having the different conversion links of incidence relation; there is protection backup link B in public network tunnel uplink A; network just often is operated on the link A; during link A fault; the detection method fast detecting of link A is to fault and alarm immediately; Business Stream is switched on the link B fast, and the link C that be associated with link A this moment (or one group of link C, D; E...) detection means on also can fast detecting arrive the related link circuits fault; also can alarm and switch to as required related link circuits C (or one group of link C, D is on the pseudo-line of backup E...); like this, Business Stream just may occur and can not switch to problem on the already present protection backup link.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of dynamic maintaining method and device of related link circuits, can guarantee to make Business Stream to switch on the already present protection backup link.
For achieving the above object, technical scheme of the present invention is achieved in that
The dynamic maintaining method of a kind of related link circuits provided by the invention is determined determined link and by determined link, and sets up determined link and by the mapping relations between the determined link; This method also comprises:
, produce the determined link alarm, and when determined link has the protection backup link, Business Stream is switched on the protection backup link of determined link during in the detection configuration detection of determined link to the determined link fault;
Notify by the detection config update retransmitting paramater of determined link according to determined link with by the mapping relations between the determined link;
By the retransmitting paramater of the detection config update of determined link self.
In the such scheme, describedly set up determined link and by before the mapping relations between the determined link, this method further comprises: set determined link respectively and disposed by the detection of determined link;
Described detection is configured to: the detection configuration of BFD method or the detection configuration of TMPLS-OAM method.
In the such scheme, describedly set up determined link and comprised by the mapping relations between the determined link: by detect configuration set up mapping relations or by the determined link sign with set up mapping relations by the sign of determined link.
In the such scheme, describedly set up mapping relations and be specially: be provided with that the detection configuration of determined link is corresponding is disposed by the detection of determined link by detecting configuration;
In the such scheme, described by determined link sign with set up mapping relations by the sign of determined link and be: be provided with determined link identify corresponding each by the sign of determined link.
In the such scheme; described retransmitting paramater by the detection config update of determined link self is specially: retransmitting paramater is upgraded according to the parameter of the protection backup link that switches to by the detection of determined link configuration, with the parameter update of determined link original in the retransmitting paramater parameter for the protection backup link.
In the such scheme, when determined link was not protected backup link, this method further comprised: the detection configuration of determined link is not notified by the detection config update retransmitting paramater of determined link, does not carry out the switching of link.
In the such scheme, this method further comprises: alarmed during to fault by the detection configuration detection of determined link;
Protection is arranged during backup link by determined link, when being alarmed during to fault, Business Stream is switched to by on the protection backup link of determined link by the detection configuration detection of determined link.
The dynamic maintenance device of a kind of related link circuits provided by the invention, this device comprises: preset module, first detects configuration module, second and detects configuration module, judge module, handover module, mapping block; Wherein, preset module is used for determining determined link and by determined link, and sets determined link respectively and by the detection of determined link configuration and set up determined link and by the mapping relations between the determined link;
First detects configuration module, is used for the detection configuration detection determined link according to determined link, when detecting the determined link fault, alarms and notify judge module;
Second detects configuration module, is used for when receiving judge module update notifications retransmitting paramater, to being upgraded by the retransmitting paramater of the detection of determined link configuration;
Judge module is used for when judging that determined link has the protection backup link, and the notice handover module switches to Business Stream on the protection backup link of determined link, and the notice mapping block;
Handover module is used for Business Stream is switched to the protection backup link of determined link;
Mapping block is used for notifying second to detect configuration module renewal retransmitting paramater according to determined link and by the mapping relations between the determined link.
In the such scheme, described judge module does not carry out any operation when judging that determined link is not protected backup link;
In the such scheme, described second detects configuration module, be further used for according to by the detection configuration detection of determined link by determined link, when detecting the determined link fault, alarm.
In the such scheme, described second detects configuration module, also is used for when detecting the determined link fault notice judge module when alarming;
In the such scheme, described judge module further also is used for judging by determined link whether the protection backup link is arranged, and has and then notifies handover module that Business Stream is switched to by on the protection backup link of determined link;
In the such scheme, described handover module is further used for Business Stream is switched to by on the protection backup link of determined link.
The dynamic maintaining method of a kind of related link circuits provided by the invention and device are set up determined link and by the mapping relations between the determined link, during to the determined link fault, produce the determined link alarm in the detection configuration detection of determined link; Business Stream is switched on the protection backup link; Notify by the detection config update retransmitting paramater of determined link according to described mapping relations; By the retransmitting paramater of the detection config update of determined link self; Thereby make Business Stream when switching to the protection backup link of determined link, do not produced alarm, do not switched by determined link by the configuration of the detection on the determined link.So, can guarantee that Business Stream switches on the already present protection backup link, thereby guarantee the normal Business Stream of transmitting on the protection backup link.
Description of drawings
Fig. 1 is RSVP (RSVP-TE, a ResourceReSerVation Protocol Traffic Engineering) tunnel applications topology diagram based on the traffic engineering expansion;
Fig. 2 realizes a kind of schematic flow sheet of dynamic maintaining method of related link circuits for the present invention;
Fig. 3 realizes a kind of structural representation of dynamic maintenance device of related link circuits for the present invention;
Fig. 4 for the present invention on topological structure as shown in Figure 1, realize the schematic flow sheet of the dynamic maintaining method of related link circuits;
Fig. 5 is one and transmits multiprotocol label switching (TMPLS) tunnel applications topology diagram;
Fig. 6 for the present invention on topological structure as shown in Figure 5, realize the schematic flow sheet of the dynamic maintaining method of related link circuits.
Embodiment
Basic thought of the present invention is: set up determined link and by the mapping relations between the determined link, when determined link breaks down, produce the determined link alarm; Business Stream is switched on the protection backup link; Notify by the detection config update retransmitting paramater of determined link according to described mapping relations; By the retransmitting paramater of the detection config update of determined link self.
The present invention is described in further detail below by drawings and the specific embodiments.
The present invention realizes a kind of dynamic maintaining method of related link circuits, and as shown in Figure 2, this method comprises following step:
Step 201: determine determined link and by determined link, set determined link respectively and, and set up determined link and by the mapping relations between the determined link by the detection of determined link configuration;
Concrete; on the node of the both link ends of transmitting Business Stream, as determined link, the pseudo-wired link related with it is by determined link with the tunnel links of transmitting Business Stream; described can be had a plurality ofly by determined link, for determined link the protection backup link is set simultaneously.
Set determined link respectively and, wherein, be the parameter of determined link by the retransmitting paramater in the detection of the determined link configuration by the detection of determined link configuration; Set up determined link and by the mapping relations between the determined link, such as: can be directly to set up mapping relations by detecting configuration, also can be by determined link sign with set up mapping relations and set up mapping relations etc. by the sign of determined link by determined link with by other association attributes of determined link, describedly set up mapping relations and be: be provided with that the detection configuration of determined link is corresponding is disposed by the detection of determined link by detecting configuration; Described by determined link sign with set up mapping relations by the sign of determined link and be: be provided with determined link identify corresponding each by the sign of determined link.Wherein, described detection configuration is specially the detection configuration of BFD method or the detection configuration of TMPLS-OAM method etc.; The parameter of described determined link comprises: the tunnel label parameter of determined link, two layers of outbound port parameter etc.
In this step, further do not comprise the protection backup link being set for determined link;
Further, also be included as by determined link the protection backup link is set.
Step 202:, produce the determined link alarm, and judge whether determined link has the protection backup link during to the determined link fault in the detection configuration detection of determined link, if having, then execution in step 203; If no, execution in step 204 then;
Step 203: Business Stream is switched on the protection backup link, and simultaneously according to determined link and by the mapping relations between the determined link, notice is by the detection config update retransmitting paramater of determined link; After notified, by the retransmitting paramater of the detection config update of determined link self, end process flow process;
Concrete, when setting up mapping relations by detecting configuration when determined link and by determined link, Business Stream is switched on the protection backup link, and the detection of determined link configuration is simultaneously disposed by the detection of determined link according to correspondence, and notice is by the detection config update retransmitting paramater of determined link; When setting up mapping relations by the determined link sign and by the sign of determined link when determined link and by determined link, Business Stream is switched on the protection backup link, simultaneously according to the determined link sign corresponding by the sign of determined link, notice is by the detection config update retransmitting paramater of determined link;
Described retransmitting paramater by the detection config update of determined link self is specially: retransmitting paramater is upgraded according to the parameter of the protection backup link that switches to by the detection of determined link configuration, with the parameter update of determined link original in the retransmitting paramater parameter for the protection backup link; The parameter of described protection backup link comprises: the tunnel label parameter of protection backup link, two layers of outbound port parameter etc.
Step 204: do not carry out handoff links operation, the detection configuration of determined link is not notified by the detection config update of determined link, is being alarmed during to fault by the detection configuration detection of determined link;
Further, protection is being arranged during backup link by determined link, when being alarmed during to fault, Business Stream is being switched to by on the protection backup link of determined link in this step by the detection configuration detection of determined link.
For realizing said method, the present invention also provides the dynamic maintenance device that realizes a kind of related link circuits, as shown in Figure 3, this device is arranged on the node of the both link ends of transmitting Business Stream, comprising: preset module 30, first detects configuration module 31, second and detects configuration module 32, judge module 33, handover module 34, mapping block 35; Wherein,
Preset module 30 is used for determining determined link and by determined link, and sets determined link respectively and by the detection of determined link configuration and set up determined link and by the mapping relations between the determined link; Describedly set up determined link and can be directly to set up mapping relations by detecting configuration by the mapping relations between the determined link, also can be by the determined link sign with set up mapping relations and set up mapping relations etc. by the sign of determined link by determined link with by other association attributes of determined link;
First detects configuration module 31, is used for the detection configuration detection determined link according to determined link, when detecting the determined link fault, alarms and notify judge module 33;
Second detects configuration module 32, is used for when receiving mapping block 35 update notifications retransmitting paramaters, to being upgraded by the retransmitting paramater of the detection of determined link configuration, retransmitting paramater is updated to the parameter of protection backup link;
Judge module 33 is used to judge whether determined link has the protection backup link, and notice handover module 34 switched to Business Stream on the protection backup link of determined link when the protection backup link was arranged, and notice mapping block 35; Do not carry out any operation when not protecting backup link;
Handover module 34 is used for Business Stream is switched to the protection backup link of determined link;
Mapping block 35 is used for notifying second to detect configuration module 32 renewal retransmitting paramaters according to determined link and by the mapping relations between the determined link.
Described second detects configuration module 32, be further used for according to by the detection configuration detection of determined link by determined link, when detecting the determined link fault, alarm;
Further, described second detects configuration module 32 when detecting the determined link fault, notice judge module 33 when alarming;
Described judge module 33 is further used for judging by determined link whether the protection backup link is arranged, and has and then notifies handover module 34 that Business Stream is switched to by on the protection backup link of determined link;
Described handover module 34 is further used for Business Stream is switched to by on the protection backup link of determined link.
Describe the implementation procedure and the principle of method of the present invention in detail below in conjunction with specific embodiment.
Embodiment one: on topological structure as shown in Figure 1, the dynamic maintaining method of realizing related link circuits in the present embodiment as shown in Figure 4, this method may further comprise the steps:
Step 401: the mapping relations of setting up determined link and being disposed by the determined link detection;
Concrete, the CE1 node is required to report his or her problems within a prescribed time and in a prescribed place by the PE1 node and is inserted the CE2 node, and setting up tunnel PE1-P2-PE3 earlier is main tunnel links, i.e. and the protection backup tunnel PE1-P4-PE3 of determined link, and configuration determined link also is called the protection backup link; On determined link PE1-P2-PE3, dispose the pseudo-wired link PW1 related again, promptly by determined link with it.
On PE1, PE3 node, the detection on the setting determined link PE1-P2-PE3 is configured to the detection configuration of BFD method, is BFD session 1, is used for detecting the failure condition in main tunnel; Setting also is the detection configuration of BFD method by the configuration of the detection on the determined link PW1, is BFD session 2, is used for detecting the failure condition by determined link PW1, and wherein the retransmitting paramater in the BFD session 2 is the parameter of determined link PE1-P2-PE3; Set up determined link PE1-P2-PE3 and the mapping relations that detected configuration by determined link PW1, be specially: BFD session 1 corresponding BFD session 2 is set.Need to prove that tunnel described in the present embodiment is the RSVP-TE tunnel, also can be MPLS LDP tunnel.
In this step, further comprise the protection backup link PE1-P4-PE3 that does not dispose determined link;
Further, also comprise configured tunneling technique PE1-P4-PE5, on this tunnel, dispose the pseudo-wired link PW2 related again, and configuration PW2 is the protection backup link of PW1 with it; Configuration access node CE1 requires to report his or her problems within a prescribed time and in a prescribed place by PW1, PW2 and inserts CE2, makes communication normal.
When step 402:PE1, PE3 node detect the determined link fault in BFD session 1, produce the determined link alarm, and judge whether determined link has the protection backup link, if having, then execution in step 403; If no, execution in step 404 then;
Step 403:PE1, PE3 node switch to Business Stream on the protection backup link PE1-P4-PE3 immediately, upgrade retransmitting paramater according to determined link PE1-P2-PE3 with the mapping relations notice BFD session 2 that is detected configuration by determined link PW1 simultaneously; After notified, the retransmitting paramater of self, end process flow process are upgraded in BFD session 2;
Concrete, PE1, PE3 node switch to Business Stream on the protection backup link PE1-P4-PE3 immediately, and BFD session 1 simultaneously is BFD session 2 according to correspondence, and retransmitting paramater is upgraded in notice BFD session 2; After notified, the retransmitting paramater of self, end process flow process are upgraded in BFD session 2;
The retransmitting paramater that described BFD session 2 is upgraded self is specially: BFD session 2 is upgraded retransmitting paramater according to the parameter of the protection backup link PE1-P4-PE3 that switches to, with the parameter update of determined link PE1-P2-PE3 original in the retransmitting paramater parameter for protection backup link PE1-P4-PE3.
Step 404:PE1, PE3 node do not carry out the handoff links operation, and BFD session 1 does not notify BFD session 2 to upgrade, and alarms when BFD session 2 detects by determined link PW1 fault;
Further; when protection backup link PW2 is arranged by determined link PW1; when this step is alarmed when BFD session 2 detects by determined link PW1 fault; the PE1 node will be switched on the protection backup link PW2 by determined link PW1; and according to the related tunnel PE1-P4-PE5 of the backup link of protection described in the step 401 PW2; Business Stream promptly switches on the tunnel PE1-P4-PE5, guarantees the proper communication of CE1 to CE2.
Embodiment two: on topological structure as shown in Figure 5, the dynamic maintaining method of realizing related link circuits in the present embodiment as shown in Figure 6, this method may further comprise the steps:
Step 601: the mapping relations of setting up determined link and being disposed by the determined link detection;
Concrete, the CE1 node is required to report his or her problems within a prescribed time and in a prescribed place by the PE1 node and is inserted the CE2 node, and setting up tunnel PE1-P2-PE3 earlier is main tunnel links, i.e. and the protection backup tunnel PE1-P4-PE3 of determined link, and configuration determined link also is called the protection backup link; On determined link PE1-P2-PE3, dispose the pseudo-wired link PW1 related again, promptly by determined link with it.
Detection on the setting determined link PE1-P2-PE3 is configured to the detection configuration of TMPLS-OAM method, is TMPLS-OAM session 1, is used for detecting the failure condition in main tunnel; Setting also is the detection configuration of TMPLS-OAM method by the configuration of the detection on the determined link PW1, be TMPLS-OAM session 2, be used for detecting the failure condition by determined link PW1, wherein the retransmitting paramater in the TMPLS-OAM session 2 is the parameter of determined link PE1-P2-PE3; Set up determined link PE1-P2-PE3 and the mapping relations that detected configuration by determined link PW1, that is: TMPLS-OAM session 1 corresponding TMPLS-OAM session 2 is set.Need to prove that tunnel described in the present embodiment is the TMPLS tunnel.
In this step, further comprise the protection backup link PE1-P4-PE3 that does not dispose determined link;
Further, also comprise configured tunneling technique PE1-P5-PE6, on this tunnel, dispose the pseudo-wired link PW2 related again, and configuration PW2 is the protection backup link of PW1 with it; Configuration access node CE1 requires to report his or her problems within a prescribed time and in a prescribed place by PW1, PW2 and inserts CE2, makes communication normal.
When step 602:PE1, PE3 node detect the determined link fault in TMPLS-OAM session 1, produce the determined link alarm and judge whether determined link has the protection backup link, if having, then execution in step 603; If no, execution in step 604 then;
Step 603:PE1, PE3 node switch to Business Stream on the protection backup link PE1-P4-PE3 immediately, upgrade retransmitting paramater according to determined link PE1-P2-PE3 with the mapping relations notice TMPLS-OAM session 2 that is detected configuration by determined link PW1 simultaneously; After notified, the retransmitting paramater of self, end process flow process are upgraded in TMPLS-OAM session 2;
Concrete, PE1, PE3 node switch to Business Stream on the protection backup link PE1-P4-PE3 immediately, and TMPLS-OAM session 1 simultaneously is TMPLS-OAM session 2 according to correspondence, and retransmitting paramater is upgraded in notice TMPLS-OAM session 2; After notified, the retransmitting paramater of self, end process flow process are upgraded in TMPLS-OAM session 2;
The described retransmitting paramater that TMPLS-OAM session 2 is upgraded self is specially: TMPLS-OAM session 2 is upgraded retransmitting paramater according to the parameter of the protection backup link PE1-P4-PE3 that switches to; with the parameter of determined link PE1-P2-PE3 original in the retransmitting paramater, be updated to the parameter of protection backup link PE1-P4-PE3.
Step 604:PE1, PE3 node do not carry out the handoff links operation, and TMPLS-OAM session 1 does not notify TMPLS-OAM session 2 to upgrade, and alarms when TMPLS-OAM session 2 detects by determined link PW1 fault;
Further; when protection backup link PW2 is arranged by determined link PW1; when this step is alarmed when TMPLS-OAM session 2 detects by determined link PW1 fault; the PE1 node will be switched on the protection backup link PW2 by determined link PW1; and according to the related tunnel PE1-P5-PE6 of the backup link of protection described in the step 601 PW2; Business Stream promptly switches on the tunnel PE1-P5-PE6, guarantees the proper communication of CE1 to CE2.
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. the dynamic maintaining method of a related link circuits is characterized in that, determines determined link and by determined link, and sets up determined link and by the mapping relations between the determined link; This method also comprises:
, produce the determined link alarm, and when determined link has the protection backup link, Business Stream is switched on the protection backup link of determined link during in the detection configuration detection of determined link to the determined link fault;
Notify by the detection config update retransmitting paramater of determined link according to determined link with by the mapping relations between the determined link;
By the retransmitting paramater of the detection config update of determined link self.
2. dynamic maintaining method according to claim 1 is characterized in that, describedly sets up determined link and by before the mapping relations between the determined link, this method further comprises: set determined link respectively and disposed by the detection of determined link;
Described detection is configured to: the detection configuration that two-way forwarding detects the detection configuration of (BFD) method or transmits multiprotocol label switching operation management maintain technology (TMPLS-OAM) method.
3. dynamic maintaining method according to claim 1 and 2, it is characterized in that, describedly set up determined link and comprised by the mapping relations between the determined link: by detect configuration set up mapping relations or by the determined link sign with set up mapping relations by the sign of determined link.
4. dynamic maintaining method according to claim 3 is characterized in that, describedly sets up mapping relations and is specially by detecting configuration: be provided with that the detection configuration of determined link is corresponding is disposed by the detection of determined link;
Described by determined link sign with set up mapping relations by the sign of determined link and be: be provided with determined link identify corresponding each by the sign of determined link.
5. dynamic maintaining method according to claim 1; it is characterized in that; described retransmitting paramater by the detection config update of determined link self is specially: retransmitting paramater is upgraded according to the parameter of the protection backup link that switches to by the detection of determined link configuration, with the parameter update of determined link original in the retransmitting paramater parameter for the protection backup link.
6. dynamic maintaining method according to claim 1; it is characterized in that; when determined link was not protected backup link, this method further comprised: the detection configuration of determined link is not notified by the detection config update retransmitting paramater of determined link, does not carry out the switching of link.
7. dynamic maintaining method according to claim 6 is characterized in that, this method further comprises: alarmed during to fault by the detection configuration detection of determined link;
Protection is arranged during backup link by determined link, when being alarmed during to fault, Business Stream is switched to by on the protection backup link of determined link by the detection configuration detection of determined link.
8. the dynamic maintenance device of a related link circuits is characterized in that, this device comprises: preset module, first detects configuration module, second and detects configuration module, judge module, handover module, mapping block; Wherein, preset module is used for determining determined link and by determined link, and sets determined link respectively and by the detection of determined link configuration and set up determined link and by the mapping relations between the determined link;
First detects configuration module, is used for the detection configuration detection determined link according to determined link, when detecting the determined link fault, alarms and notify judge module;
Second detects configuration module, is used for when receiving judge module update notifications retransmitting paramater, to being upgraded by the retransmitting paramater of the detection of determined link configuration;
Judge module is used for when judging that determined link has the protection backup link, and the notice handover module switches to Business Stream on the protection backup link of determined link, and the notice mapping block;
Handover module is used for Business Stream is switched to the protection backup link of determined link;
Mapping block is used for notifying second to detect configuration module renewal retransmitting paramater according to determined link and by the mapping relations between the determined link.
9. dynamic maintenance device according to claim 8 is characterized in that, described judge module does not carry out any operation when judging that determined link is not protected backup link;
Described second detects configuration module, be further used for according to by the detection configuration detection of determined link by determined link, when detecting the determined link fault, alarm.
10. dynamic maintenance device according to claim 9 is characterized in that, described second detects configuration module, also is used for when detecting the determined link fault notice judge module when alarming;
Described judge module further also is used for judging by determined link whether the protection backup link is arranged, and has and then notifies handover module that Business Stream is switched to by on the protection backup link of determined link;
Described handover module is further used for Business Stream is switched to by on the protection backup link of determined link.
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