CN110138636A - Dynamic linear guard method and device - Google Patents
Dynamic linear guard method and device Download PDFInfo
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- CN110138636A CN110138636A CN201910362545.XA CN201910362545A CN110138636A CN 110138636 A CN110138636 A CN 110138636A CN 201910362545 A CN201910362545 A CN 201910362545A CN 110138636 A CN110138636 A CN 110138636A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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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
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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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
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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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
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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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
- H04L45/22—Alternate routing
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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
- H04L45/70—Routing based on monitoring results
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Abstract
The embodiment of the present invention discloses a kind of method and device of dynamic linear protection; wherein method includes the following steps: to carry out detection of connectivity to the standby usage link two PE nodes; an intermediate state link is calculated between two PE nodes based on Routing Protocol; the intermediate state link is different from standby usage link; then the link overhead for calculating standby usage link and intermediate state link, carries out dynamic service switching according to the testing result of link overhead and detection of connectivity between standby usage link and intermediate state link.Using the present invention, connectivity and intermediate state link is detected by increasing backup path, then be equipped with APS message, network stabilization can be improved, reduce the time of dynamic service switching.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of dynamic linear guard method and devices.
Background technique
As the vision of the arrival in 5G epoch, the rapid development of " internet+", all things on earth interconnection is realized step by step, city
Field has urgent demand to the large capacity of network, high bandwidth, high quality, high reliability etc., self-healing property and self-healing to network
There are increasingly higher demands in time, especially for departments such as finance, national defence, must reach carrier class to network failure switching
Level proposes (in 50ms) to be clearly required.
In order to meet the needs of network rapid development, major operator is laid with PTN, IP RAN, OTN equipment, business energetically
Dynamic is slowly transitioned by static state, giving network stabilization and network failure switching time, more stringent requirements are proposed.Some departments,
Such as finance, defense sector etc., due to the static traffic that the reliability of dynamic service is not high and uses always.
In the prior art, although dynamic service can reach the self-healing of business by routing convergence, its self-healing time
It is extremely difficult to the requirement of carrier class, it is many to be primarily limited to utilization rate of CPU the etc. when convergence rate, agreement operation of agreement itself
Factor causes the network self-healing time unpredictable, and network stabilization is poor.
Traditional LDP FRR protected mode are as follows: if primary path failure, is directly switched to backup path, if standby
With path and failure, then need through routing convergence come for service path pathfinding, business switching time just be cannot be guaranteed.
Summary of the invention
The embodiment of the present invention provides a kind of dynamic linear guard method and device, passes through and increases backup path and detect connectivity
And intermediate state link, then it is equipped with APS message, network stabilization can be improved, reduce the time of dynamic service switching.
First aspect of the embodiment of the present invention provides a kind of dynamic linear guard method, it may include:
Detection of connectivity is carried out between the standby usage link two PE nodes；
An intermediate state link is calculated between two PE nodes based on Routing Protocol, intermediate state link is different from standby usage chain
Road；
Calculate the link overhead of standby usage link and intermediate state link；
It is moved between standby usage link and intermediate state link according to the testing result of link overhead and detection of connectivity
State service switching.
Further, the above method further include:
Detection of connectivity is carried out to standby usage link based on APS protection mechanism；
Current service condition is determined according to APS value.
Further, the above method further include:
When the service condition of standby usage link is reserve link failure state, that is, SF-P state, by intermediate state link switching
For reserve link；
A new intermediate state link is calculated between two PE nodes.
Further, the above method further include:
When the service condition of standby usage link is that standby usage is alerted without detection of connectivity and work is in master state, that is, NR-
When W state, compare the size of the link overhead of reserve link and intermediate state link；
When the link overhead of intermediate state link is less than the link overhead of reserve link, intermediate state link is determined as new standby
With link, and using former reserve link as intermediate state link.
Further, the above method further include:
When new reserve link is there are when connectivity alarm, former reserve link is switched to, from newly calculating new intermediate state link.
Further, the above method further include:
When the link overhead of intermediate state link is greater than the link overhead of reserve link, two are calculated based on default calculating cycle
New link overhead between PE node；
Compare the link overhead of intermediate state link and the size of new link overhead；
When new link overhead is greater than the link overhead of squirrel intermediate state link, the corresponding link of new link overhead is determined
For new intermediate state link.
Further, the above method further include:
When the service condition of standby usage link is that standby usage is alerted without detection of connectivity and work is in stand-by state, that is, WTR
Or when NR-P state, compare the size of the link overhead of active link and reserve link；
If the link overhead of active link is greater than the link overhead of reserve link, reserve link is upgraded into active link,
And former active link is switched to reserve link, and APS value is revised as NR-W.
Further, the above method further include:
If the link overhead of active link is less than the link overhead of reserve link, by business after Wait to Restore Time
It is switched to primary, while APS value is revised as NR-W.
Further, the above method further include:
When active link is since SD is alerted or SF alarm or is received APS value that opposite end is sent and is SD or receives pair
When to hold the APS value that sends be SF, service switching is to spare, and intermediate state link upgrades to new active link；
If new active link has detection of connectivity alarm, switchback original active link, and finds an intermediate state again
Link.
Second aspect of the embodiment of the present invention provides a kind of dynamic linear protective device, it may include:
Detection of connectivity module, for carrying out detection of connectivity to the standby usage link two PE nodes；
Intermediate line link computing module, for calculating an intermediate state link between two PE nodes based on Routing Protocol, in
Between state link be different from standby usage link；
Link overhead computing module, for calculating the link overhead of standby usage link and intermediate state link；
Service switching module, for the testing result according to link overhead and detection of connectivity in standby usage link and centre
Dynamic service switching is carried out between state link.
Further, above-mentioned detection of connectivity module is also used to, and is connected to based on APS protection mechanism to standby usage link
Property detection；
State determining module, for determining current service condition according to APS value.
Further, above-mentioned apparatus further include:
First link switching module is reserve link failure state, that is, SF-P shape for the service condition when standby usage link
It is reserve link by intermediate state link switching when state；
Intermediate line link computing module is also used to calculate a new intermediate state link between two PE nodes.
Further, above-mentioned apparatus further include:
Link overhead comparison module is that standby usage is alerted without detection of connectivity for the service condition when standby usage link
And work compares the size of the link overhead of reserve link and intermediate state link in master state, that is, NR-W state；
Second link switching module, when for being less than the link overhead of reserve link when the link overhead of intermediate state link,
Intermediate state link is determined as new reserve link, and using former reserve link as intermediate state link.
Further, above-mentioned apparatus further include:
Third link switching module, for switching to former reserve link when new reserve link is there are when connectivity alarm, from
Newly calculate new intermediate state link.
Further, above-mentioned apparatus further include:
New link calculation module, when for being greater than the link overhead of reserve link when the link overhead of intermediate state link, base
The new link overhead between default calculating cycle calculates two PE nodes；
Link overhead comparison module is also used to compare the link overhead of intermediate state link and the size of new link overhead；
4th link switching module, when for being less than the link overhead of intermediate state link when new link overhead, by new link
The corresponding link of expense is determined as new intermediate state link.
Further, above-mentioned apparatus further include:
Link overhead comparison module is also used to when the service condition of standby usage link be that standby usage is accused without detection of connectivity
Alert and work compares the size of the link overhead of active link and reserve link in stand-by state, that is, WTR NR-P state；
5th link switching module will be standby if being greater than the link overhead of reserve link for the link overhead of active link
Upgrade to active link with link, and former active link is switched to reserve link, and APS value is revised as NR-W.
Further, above-mentioned apparatus further include:
Service switching module is waiting if the link overhead for being also used to active link is less than the link overhead of reserve link
Service switching is later primary by the time to be restored, while APS value is revised as NR-W.
Further, above-mentioned apparatus further include:
Service switching module is also used to when active link is since SD is alerted or SF is alerted or receives what opposite end was sent
APS value is SD or receives APS value that opposite end is sent when being SF, and service switching is to spare, and intermediate state link upgrades to newly
Active link；
Service switching module, if being also used to new active link has a detection of connectivity alarm, switchback original active link, and
Again an intermediate state link is found.
In embodiments of the present invention, connectivity and intermediate state link are detected by increasing backup path, then is equipped with aps report
Text improves network stabilization, reduces the time of dynamic service switching.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.
Fig. 1 is a kind of flow diagram of dynamic linear guard method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of topological diagram provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another topological diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of dynamic linear protective device provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
Below in conjunction with attached drawing 1- attached drawing 3, it is situated between in detail to dynamic linear guard method provided in an embodiment of the present invention
It continues.
Referring to Figure 1, for the embodiment of the invention provides a kind of flow diagrams of dynamic linear guard method.Such as Fig. 1
It is shown, the embodiment of the present invention the method may include following steps S101- step S104.
S101 carries out detection of connectivity to the standby usage link two PE nodes.
It is understood that above-mentioned apparatus can enable BFD (Bidirectional Forwarding Detection)
CC message in agreement or OAM (Operation Administration and Maintenance) agreement carries out connectivity
Detection, i.e., link has detection of connectivity in standby usage.
Specifically, APS function can be enabled on above-mentioned PE node, standby usage link is connected based on APS protection mechanism
General character detection.Wherein, state machine, that is, ASP value of the defeated APS message of spare road link, ASP field can reflect the company between link
The general character.Above-mentioned detection of connectivity may include detection connected state and detect whether that there are connectivity alarms.Optionally, above-mentioned
Device can determine that current service condition, the service condition can indicate the transmission path that current business uses according to APS value,
Or the path is alerted with the presence or absence of connectivity.
S102 calculates an intermediate state link based on Routing Protocol between two PE nodes.
Specifically, above-mentioned apparatus can calculate an intermediate state link based on Routing Protocol between two PE nodes, certainly
An intermediate state link can also be calculated using other means, it is to be understood that above-mentioned intermediate state link can with when it is different
In other any links of above-mentioned standby usage link.For example, topological diagram shown in Fig. 2, if the business of U1-1 is landed from U3-2,
Then each link can be assumed are as follows: primary U1-1<->U2-1<->U3-1<->U3-2, spare U1-1<->U2-2<->U3-3
<->U3-4<->U3-2, intermediate state link U1-1<->U2-2<->U2-3<->U3-3<->U3-4<->U3-2.
S103 calculates the link overhead of standby usage link and intermediate state link.
Specifically, above-mentioned apparatus can calculate standby usage link and intermediate state link before carrying out dynamic service switching
Link overhead.It is understood that above-mentioned apparatus needs to be determined according to specific link connected state and current operating path
Whether need to calculate above-mentioned link overhead, and needs to calculate the link overhead of which link.For example, the business of standby usage link
State is that standby usage is alerted without detection of connectivity and worked in master state, that is, NR-W state, and above-mentioned apparatus can calculate this
When reserve link and intermediate state link link overhead, further, can more above-mentioned two link overhead size.
S104, according to the testing result of link overhead and detection of connectivity between standby usage link and intermediate state link into
Mobile state service switching.
Specifically, above-mentioned apparatus can according to the testing result of link overhead and detection of connectivity standby usage link and in
Between dynamic service switching is carried out between state link.
Optionally, when the service condition of standby usage link be reserve link failure state, that is, SF-P state when, can will in
Between state link switching be reserve link a new intermediate state link further can be calculated between above-mentioned two PE node.
Optionally, when the service condition of standby usage link is above-mentioned NR-W state, and the link overhead of intermediate state link is small
When the link overhead of reserve link, intermediate state link can be determined as new reserve link by above-mentioned apparatus, and by former spare chain
Road is as intermediate state link.Further, new reserve link above-mentioned at that time is there are when connectivity alarm, above-mentioned apparatus can will in
Between state link switching to former reserve link, and from newly calculating new intermediate state link.There is no connect for new reserve link above-mentioned at that time
It then can be reserve link with the link when general character alerts, former reserve link is intermediate state link.
Optionally, when the service condition of standby usage link be NR-W state, and the link overhead of intermediate state link be greater than it is standby
When with the link overhead of link, above-mentioned apparatus can recalculate new link overhead between two PE nodes based on default calculating cycle,
Further, the link overhead of intermediate state link and the size of new link overhead can be compared, when new link overhead is less than centre
When the link overhead of state link, the corresponding link of new link overhead can be determined as to new intermediate state link.When new link overhead
Greater than intermediate state link link overhead when, then continue periodically to find new link, and so on, then reserve link is eventually
It is switched in addition to primary path on the optimal path of residual paths.
Optionally, when the service condition of above-mentioned standby usage link is that standby usage is alerted without detection of connectivity and work is standby
When with state, that is, WTR NR-P state, the size of the link overhead of active link and reserve link can be compared.If primary chain
The link overhead on road is greater than the link overhead of reserve link, and reserve link can upgrade to active link, and by former primary chain
Road is switched to reserve link, and above-mentioned APS value is revised as NR-W.If the link overhead of active link is less than the link of reserve link
Service switching is then primary after Wait to Restore Time, while above-mentioned APS value is revised as NR-W by expense.
Optionally, when active link due to SD alert or SF alarm or receive APS value that opposite end is sent be SD or
Person receives APS value that opposite end is sent when being SF, can be by service switching to spare, and intermediate state link is upgraded to new master
Use link.If new active link has detection of connectivity alarm, switchback original active link, and finds an intermediate state again
Link.It can be repeated above operation after finding new intermediate state link, until finding new active link.
It is understood that in embodiments of the present invention, above-mentioned path can flexibly change, and there are active and standby exchange can
Can property, the message (such as LO, FS, MS) that artificial control command is switched involved in used APS message not utilizes.
It should be noted that the principle that above-mentioned link overhead size compares may is that i.e. the matched business in inoperative path not
It is compared between the path walked, whose expense is small, whom is switched to, and connectivity testing message is also cut through, if connection
Property detection no alarm then switch successfully, if there is alert then switchback and again search intermediate state link；Operating path is only standby
Used time just carries out the comparison with primary expense, to carry out active and standby exchange, prevent due to service switching rear path expense variation and
The risk of caused continuous frequent switching.
In embodiments of the present invention, connectivity and intermediate state link are detected by increasing backup path, then is equipped with aps report
Text improves network stabilization, reduces the time of dynamic service switching.
In a kind of specific implementation of the embodiment of the present invention, it can be said by topological structure as shown in Figures 2 and 3
The realization process of the leading guard method of dynamic shown in the bright embodiment of the present invention.
If the business of U1-1 is landed from U3-2, it is equipped with dynamic protection business of the present invention, each link assumes are as follows: main
It is intermediate with U1-1<->U2-1<->U3-1<->U3-2, spare U1-1<->U2-2<->U3-3<->U3-4<->U3-2
State link U1-1<->U2-2<->U2-3<->U3-3<->U3-4<->U3-2, and standby usage is accused without detection of connectivity
Alert, vocational work is in NR-W state.
When U2-1<->U3-1 link breaks down (as shown in Figure 3), by detection of connectivity, U1-1 and U3-2 are examined
Active link failure is measured, the APS value that business is switched to reserve link, and respectively issues simultaneously at this time is SF, this is tradition
Linear protection switching, switching time reaches carrier class requirement.After switching, intermediate state link upgrades to active link, new master
With link by if still there is detection of connectivity alarm, continuing after new intermediate state link generates after detection of connectivity
Switch over operation, if alerted without detection of connectivity, it is new it is primary upgrade successfully, new intermediate state link continues to seek
It looks for.Here, it is assumed that new primary first time just upgrade successfully, then each path at this time are as follows: primary U1-1<->U2-2<-
>U2-3<->U3-3<->U3-4<->U3-2, spare U1-1<->U2-2<->U3-3<->U3-4<->U3-2, intermediate state
Link U1-1<->U2-2<->U2-3<->U3-3<->U3-1<->U3-2.
Further, after intermediate state link upgrades into active link success, active link no alarm is that is, active and standby at this time
With equal no alarm, APS value is converted to WTR state, and in this case, the overhead size for carrying out standby usage link compares, if standby
It is less than the expense of active link with the expense of link, then reserve link upgrades to active link, and former active link is reduced to spare chain
Road, while APS value is revised as NR-W.Then each link at this time are as follows: primary U1-1<->U2-2<->U3-3<->U3-4<->
U3-2, spare U1-1<->U2-2<->U2-3<->U3-3<->U3-4<->U3-2, intermediate state link U1-1<->U2-2
<—>U2-3<—>U3-3<—>U3-1<—>U3-2。
Further, compare reserve link and centre in this case in NR-W state after above-mentioned service path conversion
The expense of state link, if the expense of intermediate state link is less than reserve link, intermediate state link upgrades to reserve link, new standby
With link by the way that after detection of connectivity, if detection of connectivity has alarm, switchback original reserve link, intermediate state link is sought again
Path is looked for, if detection of connectivity no alarm, new backup path is upgraded successfully, and former backup path is reduced to intermediate state path.Such as
The expense in fruit intermediate state path is greater than the expense of backup path, then periodically generates new intermediate state path and former intermediate state path
Compare expense, and the path of small expense is upgraded to formal intermediate state path.Here, it is assumed that the expense in intermediate state path is big
In the expense of backup path, all paths are constant.
Further, after U2-1<->U3-1 link-recovery (as shown in Figure 2), intermediate state link is until detecting U1-1
The expense of<->U2-1<->U3-1<->U3-2 is less than the expense of former intermediate state link, then by U1-1<->U2-1<->U3-1
<->U3-2 upgrades to formal intermediate state link.The intermediate state link make expense with reserve link compared with when, if its expense is small
In the expense of reserve link, then U1-1<->U2-1<->U3-1<->U3-2 upgrades to reserve link, if its connectivity is examined
No alarm is surveyed, then is upgraded successfully, former backup path is reduced to intermediate state link.It is general the case where each link at this time are as follows: primary U1-1
<->U2-2<->U3-3<->U3-4<->U3-2, spare U1-1<->U2-1<->U3-1<->U3-2, intermediate state path
U1-1<—>U2-2<—>U2-3<—>U3-3<—>U3-4<—>U3-2。
Further, on primary, the expense of standby usage compares active link, when primary expense is greater than spare expense
When, not as switching condition, increase because may cause former reserve link expense after switching, even more than former active link conduct
The expense in inoperative path, then the problem of constantly switching standby usage path will be caused.
Aforesaid operations are once normally to switch and switchback process, in more complex alarm, process and the feelings
Condition is similar, then is not contrary to further and states.As long as having the link that can lead between local PE node and far-end PE node of the invention,
Vocational work path can switch to the path, and switching time is carrier class.
It should be noted that in embodiments of the present invention, reserve link is ready, and detection of connectivity is usually
(unless only having one between two PE nodes up to link) of no alarm, active-standby switch, can as traditional LSP protection at this time
Reach carrier class switching time.
In embodiments of the present invention, in work in active link, reserve link can gradually be switched by intermediate state link
To remaining optimal path.
In embodiments of the present invention, in work in reserve link, by the comparison of standby usage expense, under certain condition
Main/slave link can be achieved to exchange, in conjunction with path switching of the above-mentioned work in active link, operating path can be made to be maintained at opposite
Preferably on path.
In embodiments of the present invention, by APS message, two PE nodes know it is mutual switch and alarm status, pass through
It switches and alarm status, local alarm and switch status, each link overhead size comparison result the opposite end that APS message obtains
Deng, it can be achieved that a set of complete and careful state machine so that dynamic service achieve the effect that it is reliable and stable.
In embodiments of the present invention, all generations of intermediate state link, the upgrading of reserve link and intermediate state link, master
The operations such as reserve link switching, it is very strong not need real-time, then will not generate burst pressure to CPU during this period and cause
The problem for causing switching time not up to standard is switched similar to traditional routing convergence.
In embodiments of the present invention, it is switched to the operation such as small link of expense in standby usage exchange operation, active link, by
It is received in PE node to be double, then it will not packet loss in principle.
The above only illustrates basic principle of the invention by a typical example network topology, not uses
In limiting the scope of protection of the present invention.All within the spirits and principles of the present invention, any modification, replacement, improvement for being made etc.,
It should all be included in the protection scope of the present invention.
Below in conjunction with attached drawing 4, describe in detail to dynamic linear protective device provided in an embodiment of the present invention.It needs
Illustrate, device shown in Fig. 4, the method for executing Fig. 1-embodiment illustrated in fig. 3 of the present invention, for ease of description, only
Part related to the embodiment of the present invention is shown, it is disclosed by specific technical details, it is shown in Fig. 3 to please refer to Fig. 1-of the present invention
Embodiment.
Fig. 4 is referred to, for the embodiment of the invention provides a kind of structural schematic diagrams of dynamic linear protective device.Such as Fig. 4
Shown, the dynamic linear protective device 10 of the embodiment of the present invention may include: detection of connectivity module 101, intermediate line link
Computing module 102, link overhead computing module 103, service switching module 104, state determining module 105, the first link switching
Module 106, link overhead comparison module 107, the second link switching module 108, third link switching module 109, new link meter
Calculate module 120, the 4th link switching module 121, the 5th link switching module 122.
Detection of connectivity module 101, for carrying out detection of connectivity to the standby usage link two PE nodes.
Intermediate line link computing module 102, for calculating an intermediate state between above-mentioned two PE node based on Routing Protocol
Link, the intermediate state link are different from above-mentioned standby usage link.
Link overhead computing module 103, for calculating the link overhead of standby usage link and intermediate state link.
Service switching module 104, for according to the testing result of link overhead and detection of connectivity in standby usage link and
Dynamic service switching is carried out between intermediate state link.
Optionally, above-mentioned detection of connectivity module 101 is also used to, and is connected based on APS protection mechanism to standby usage link
The general character detects
State determining module 105, for determining current service condition according to APS value.
Optionally, the first link switching module 106 is reserve link failure shape for the service condition when standby usage link
It is reserve link by intermediate state link switching when state, that is, SF-P state.
Intermediate line link computing module 102 is also used to calculate a new intermediate state link between two PE nodes.
Optionally, link overhead comparison module 107 is standby usage without connection for the service condition when standby usage link
Property detection alarm and work in master state, that is, NR-W state, compare the big of the link overhead of reserve link and intermediate state link
It is small.
Second link switching module 108 is less than the link overhead of reserve link for the link overhead when intermediate state link
When, intermediate state link is determined as new reserve link, and using former reserve link as intermediate state link.
Optionally, third link switching module 109, for switching to original when new reserve link is there are when connectivity alarm
Reserve link, from newly calculating new intermediate state link.
Optionally, new link calculation module 120 is greater than the link of reserve link for the link overhead when intermediate state link
When expense, based on new link overhead between the above-mentioned two PE node of default calculating cycle calculating.
Link overhead comparison module 107 is also used to compare the link overhead of intermediate state link and the size of new link overhead.
4th link switching module 121, when for being less than the link overhead of intermediate state link when new link overhead, by new chain
Expense corresponding link in road is determined as new intermediate state link.
Optionally, link overhead comparison module 107 is also used to when the service condition of standby usage link be standby usage without even
General character detection is alerted and is worked in stand-by state, that is, WTR NR-P state, compares the link of active link and reserve link
The size of expense；
5th link switching module 122 will if being greater than the link overhead of reserve link for the link overhead of active link
Reserve link upgrades to active link, and former active link is switched to reserve link, while APS value is revised as NR-W.
Optionally, service switching module 104, if the link that the link overhead for being also used to active link is less than reserve link is opened
Service switching is then primary after Wait to Restore Time, while APS value is revised as NR-W by pin.
Optionally, service switching module 104 is also used to when active link due to SD alarm or SF alarm or receives pair
Holding the APS value that sends is SD or when to receive APS value that opposite end is sent be SF, and service switching is to spare, and intermediate state chain
Road upgrades to new active link.
Service switching module 104, if being also used to new active link has detection of connectivity alarm, the former primary chain of switchback
Road, and an intermediate state link is found again.
It should be noted that can join will be upper for guard method described in dynamic linear protective device in the embodiment of the present invention
The specific descriptions in embodiment of the method are stated, details are not described herein again.
In embodiments of the present invention, connectivity and intermediate state link are detected by increasing backup path, then is equipped with aps report
Text improves network stabilization, reduces the time of dynamic service switching.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (10)
1. a kind of dynamic linear guard method characterized by comprising
Detection of connectivity is carried out between the standby usage link two PE nodes；
An intermediate state link is calculated between the two PE node based on Routing Protocol, the intermediate state link is different from described
Standby usage link；
Calculate the link overhead of the standby usage link and the intermediate state link；
According to the testing result of the link overhead and the detection of connectivity in the standby usage link and the intermediate state chain
Dynamic service switching is carried out between road.
2. the method according to claim 1, wherein the method also includes:
Detection of connectivity is carried out to the standby usage link based on APS protection mechanism；
Current service condition is determined according to APS value.
3. the method according to claim 1, wherein the method also includes:
When the service condition of the standby usage link is reserve link failure state, that is, SF-P state, by the intermediate state link
It is switched to reserve link；
A new intermediate state link is calculated between the two PE node.
4. the method according to claim 1, wherein the method also includes:
When the service condition of the standby usage link is that standby usage is alerted without detection of connectivity and work is in master state, that is, NR-
When W state, the size of the link overhead of the reserve link and the intermediate state link；
It is when the link overhead of the intermediate state link is less than the link overhead of the reserve link, the intermediate state link is true
It is set to new reserve link, and using former reserve link as intermediate state link.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
When the new reserve link is there are when connectivity alarm, former reserve link is switched to, from newly calculating new intermediate state link.
6. according to the method described in claim 4, it is characterized in that, the method also includes:
When the link overhead of the intermediate state link is greater than the link overhead of the reserve link, based on default calculating cycle
Calculate new link overhead between the two PE node；
Compare the link overhead of the intermediate state link and the size of the new link overhead；
When the new link overhead is less than the link overhead of the intermediate state link, by the corresponding link of the new link overhead
It is determined as new intermediate state link.
7. the method according to claim 1, wherein the method also includes:
When the service condition of the standby usage link is that standby usage is alerted without detection of connectivity and work is in stand-by state, that is, WTR
Or when NR-P state, the size of the link overhead of the active link and the reserve link；
If the link overhead of the active link is greater than the link overhead of the reserve link, based on reserve link upgrading
With link, and former active link is switched to reserve link, while the APS value is revised as NR-W.
8. the method according to the description of claim 7 is characterized in that the method also includes:
It, will after Wait to Restore Time if the link overhead of the active link is less than the link overhead of the reserve link
Service switching is primary, while the APS value is revised as NR-W.
9. the method according to claim 1, wherein the method also includes:
When the active link is since SD is alerted or SF alarm or is received APS value that opposite end is sent and is SD or receives pair
When to hold the APS value that sends be SF, service switching is to spare, and the intermediate state link upgrades to new active link；
If new active link has detection of connectivity alarm, switchback original active link, and finds an intermediate state link again.
10. a kind of dynamic linear protective device characterized by comprising
Detection of connectivity module, for carrying out detection of connectivity to the standby usage link two PE nodes；
Intermediate line link computing module, for calculating an intermediate state link, institute between the two PE node based on Routing Protocol
Intermediate state link is stated different from the standby usage link；
Link overhead computing module, for calculating the link overhead of the standby usage link and the intermediate state link；
Service switching module, for according to the testing result of the link overhead and the detection of connectivity in the standby usage chain
Dynamic service switching is carried out between road and the intermediate state link.
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