CN102291310B - Method and device for improving T-MPLS link ring network protection switching performance - Google Patents
Method and device for improving T-MPLS link ring network protection switching performance Download PDFInfo
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- CN102291310B CN102291310B CN201110248246.7A CN201110248246A CN102291310B CN 102291310 B CN102291310 B CN 102291310B CN 201110248246 A CN201110248246 A CN 201110248246A CN 102291310 B CN102291310 B CN 102291310B
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Abstract
The invention provides a method and a device for improving T-MPLS (Transport Multi-protocol Label Switching) link ring network protection switching performance. The method comprises the following steps of: a configuration step: configuring two standby forwarding paths when a router in a backbone network of a T-MPLS link is configured with a ring network protection group, wherein the two standby forwarding paths are respectively corresponding to a main channel and a standby channel; a switching step: selecting the two standby forwarding paths as current forwarding paths when the ring network protection group on the router is switched, wherein the traffic entering from the main channel is transmitted through the standby forwarding path corresponding to the main channel while the traffic entering from the standby channel is transmitted through the standby forwarding path corresponding to the standby channel. In the method, one standby forwarding path is added, so that the ring-shaped traffic is forwarded out by breaking through the ring in the moment of switching, and switching efficiency is improved.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of to improve T-MPLS (Transmission-Multiprotocol
Label Switching, transmission-multi protocol label are exchanged) method and device of link looped network protection performance of handoffs.
Background technology
T-MPLS is a kind of standardized packet tranmission techniques of International Telecommunication Union (ITU-T).T-MPLS data forwardings face
It is a subset of MPLS, its data is forwarded based on T-MPLS labels.T-MPLS is connection-oriented technology, is
Applications of the MPLS in transmission net, the function that the connection-oriented OAM and protection that increased transmission style recovers, and by ASON/
GMPLS is used as its control plane.
T-MPLS Packet Transport Network is the transfer canal for setting up end-to-end connection-oriented packet, will be towards connectionless number
Connection-oriented network is transformed into according to net.The pipeline can pass through NMS or the chain of command of intelligence is set up.T-MPLS
Also meet the hierarchy of ITU-TG.805 definition, T-MPLS layer networks can be divided into：Medium layer, section layer tms, passage layers tmp
(channel layer) and channel layer tmc (circuit layer).
ITU-T is defined to OAM(Operation Administration Maintenance)：1) performance monitoring maintenance information is produced, according to these information evaluation nets
The stability of network；2) network failure is detected by way of periodically inquiring about, produce various maintenances and warning information；3) by scheduling
Or it is switched to other entities, bypass failure entity, it is ensured that the normal operation of network；4) fault message is passed to into management real
Body.OAM effects include fault discovery, alarm, diagnosis, performance monitoring, protection.T-MPLS OAM are run in T-MPLS domains, are
Hierarchical domain, each level can only detect the OAM failures of oneself aspect.T-MPLS OAM include the OAM of TMS layers, tmp layers
OAM, the OAM of tmc layers.
The survivability of T-MPLS networks is realized by network protection and restoration technology.T-MPLS supports that protection is fallen end to end
Change, protect heterogeneous linear pretection switch and looped network protection.
Looped network protection：A kind of protection type detected by the OAM of TMS.When on network nodal test to network failure, therefore
Barrier side gusset sends switching request to adjacent node by APS agreements.When certain nodal test is asked to failing or receiving to switch
Ask, the general service for being forwarded to failure node will be switched to another direction (away from failure node).As network failure or APS
Agreement request disappears, and business will be back to original path.
When on equipment, looped network protection group is entered line command and switched, because switching is asynchronous, the wink of the switching of protection group or switchback
Between occur the inconsistent situation of protection group state, i.e. one end on two equipment of the protection group in main one end standby), and now
Main/slave link is all normal, a small amount of flow can be caused to form loop and produce certain line loss.
The content of the invention
Present invention is primarily targeted at providing a kind of method and dress of raising T-MPLS link looped network protection performance of handoffs
Put, the broken ring of flow in switching moment cyclization can be caused to forward, switching efficiency is improved.
In order to achieve the above object, the invention provides a kind of side of raising T-MPLS link looped network protection performance of handoffs
Method, comprises the following steps：
Configuration step：When looped network protection group is configured with the router in the backbone network of T-MPLS links, two are configured
Standby forward-path, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
Switch step：When looped network protection group switches on the router, two standby forward-paths are chosen as current
Forward-path, the flow come in from main tunnel walk standby forward-path corresponding with main tunnel, and the flow come in from standby tunnel is walked
Standby forward-path corresponding with standby tunnel.
Present invention also offers a kind of device of raising T-MPLS link looped network protection performance of handoffs, including configuration module and
Handover module, wherein,
The configuration module, for when looped network protection group is configured with the router in the backbone network of T-MPLS links,
Two standby forward-paths of configuration, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
The handover module, for when looped network protection group switches on the router, choosing two standby forward-paths
Used as current forward-path, the flow come in from main tunnel walks standby forward-path corresponding with main tunnel, comes in from standby tunnel
Flow walk standby forward-path corresponding with standby tunnel.
Compared with prior art, the method and dress of raising T-MPLS link looped network protection performance of handoffs of the present invention
Put, by increasing a standby forward-path so that forward in the broken ring of the flow of switching moment cyclization, improve switching effect
Rate.
Description of the drawings
Fig. 1 is the flow chart of the method for raising T-MPLS link looped network protection performance of handoffs of the present invention；
Fig. 2 is the schematic diagram that existing T-MPLS links looped network protection changing method is applied to PE1；
Fig. 3 is the signal that the method for raising T-MPLS link looped network protection performance of handoffs of the present invention is applied to PE1
Figure；
Fig. 4 is the schematic diagram that existing T-MPLS links looped network protection changing method is applied to P1；
Fig. 5 is the signal that the method for raising T-MPLS link looped network protection performance of handoffs of the present invention is applied to P1
Figure；
Fig. 6 is the existing T-MPLS chains when P1 is configured with two main tunnels and standby tunnel is the same from looped network protection group
Road looped network protection changing method is applied to the schematic diagram of P1；
Fig. 7 be when P1 is configured with two main tunnels and standby tunnel is the same from looped network protection group, it is of the present invention to carry
The method of high T-MPLS links looped network protection performance of handoffs is applied to the schematic diagram of P1；
Fig. 8 is that method of the present invention arranges two main tunnels on core router and standby tunnel identical looped network is protected
Process chart during shield group.
Specific embodiment
The method and device of raising T-MPLS link looped network protection performance of handoffs of the present invention, it is standby by increasing by one
With forward-path so that forward in the broken ring of the flow of switching moment cyclization, improve switching efficiency.
As shown in figure 1, the invention provides a kind of method of raising T-MPLS link looped network protection performance of handoffs, including with
Lower step：
Step 11, i.e. configuration step：When looped network protection group is configured with the router in the backbone network of T-MPLS links,
Two standby forward-paths of configuration, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
Step 12, i.e. switch step：When looped network protection group switches on the router, two standby forward-paths are chosen
Used as current forward-path, the flow come in from main tunnel walks standby forward-path corresponding with main tunnel, comes in from standby tunnel
Flow walk standby forward-path corresponding with standby tunnel.
During enforcement, the router is edge router and/or core router.
During enforcement, when the router is that two main tunnels and standby are configured with core router, and the core router
When tunnel is the same from looped network protection group, also include judging step between the configuration step and the switch step：Judge
Whether there is looped network protection group to switch on the core router, if it is go to switch step, otherwise terminate.
Present invention also offers a kind of device of raising T-MPLS link looped network protection performance of handoffs include configuration module and
Handover module, wherein,
The configuration module, for when looped network protection group is configured with the router in the backbone network of T-MPLS links,
Two standby forward-paths of configuration, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
The handover module, for when looped network protection group switches on the router, choosing two standby forward-paths
Used as current forward-path, the flow come in from main tunnel walks standby forward-path corresponding with main tunnel, comes in from standby tunnel
Flow walk standby forward-path corresponding with standby tunnel.
During enforcement, the router is edge router and/or core router.
During enforcement, the device of raising T-MPLS links looped network protection performance of handoffs of the present invention, also including judging mould
Block；
The judge module, is to be configured with two on core router, and the core router for working as the router
When main tunnel and standby tunnel are the same from looped network protection group, on the core router is judged whether there is looped network protection group to be cut
Change, if it is start handover module.
PE (Provider Edge Router) refers to the edge router on the backbone network of T-MPLS links, with CE phases
Even, the access of main responsible VPN traffic.
P (Provider Router) refers to the core router on the backbone network of T-MPLS links, mainly complete route and
Fast-forwarding function.
For PE equipment (by taking PE1 in Fig. 2 as an example), former scheme is as follows：
1., when being configured without looped network protection group on PE1, two forward-paths (CE1-PE1-P1 and P1-PE1-P2) are had,
Main tunnel and standby tunnel are corresponded to respectively.When configuring looped network protection group group on PE1, configuration module adds a standby forwarding
Path CE1-PE1-P2, the main forward-path of correspondence are CE1-PE1-P1.
When on 2.PE1, protection group switches, handover module chooses standby forward-path (CE1-PE1-P2) as current forwarding
Path, and label label1 setting tag-drops will be entered for tunnel so that the upper flows come in from standby tunnel of PE1 are abandoned.
When on PE1 in Fig. 2, looped network protection group is entered line command and switched, or link breaks down looped network protection group between PE1 and P1
Be switched to standby rear link-recovery it is normal when, can switch in looped network protection group or looped network protection on PE1 and P1 occur in the moment of switchback
The group inconsistent situation of state (i.e. one end is being led in standby one end), and now primary link and standby link are all normal, due to now PE1
Upper looped network protection group has switched, and understands that now flow trend is (CE1-PE1-P2- as shown in Figure 2 according to handover module process
PE2-P1-PE1), if the flow come in from standby tunnel on PE1 is not abandoned by handover module, a small amount of flow can be caused to be formed
Loop produces certain line loss.But meeting packet loss when causing switching or switchback is comprehended at the such place of handover module, affects switching
Performance.
For PE equipment (by taking PE1 in Fig. 3 as an example), the improvement project that the present invention takes is as follows：
1., when being configured without looped network protection group on PE1, two forward-paths CE1-PE1-P1 and P1-PE1-P2 are had, point
Dui Ying not main tunnel and standby tunnel.When configuring looped network protection group group on PE1, configuration module adds two standby forwarding roads
Footpath CE1-PE1-P2 and P1-PE1-P1, it is CE1-PE1-P1 and P1-PE1-P2 to correspond to main forward-path respectively.
When the upper looped network protection groups of 2.PE1 switch, handover module chooses standby forward-path (CE1-PE1-P2 and P1-PE1-
P1) as current forward-path, i.e., the flow come in from main tunnel walks standby forward-path (CE1-PE1-P2), enters from standby tunnel
The flow for coming walks standby forward-path (P1-PE1-P1).And with unlike former scheme, the present invention will not enter mark for tunnel
Sign label1 and tag-drop is set, the flow so come in from standby tunnel will walk standby forward-path (P1-PE1-P1).
When on PE1 in Fig. 3 looped network protection group it is standby and on P1 looped network protection group leading, due to looped network protection on now PE1
Group has switched, and understands now flow trend (CE1-PE1-P2-PE2-P1-PE1- as shown in Figure 3 according to handover module process
P1-PE2-CE2), so process if will not be formed loop also will not packet loss, greatly improve performance of handoffs.
For P equipment (by taking P1 in Fig. 4 as an example), former scheme is as follows：
1., when being configured without looped network protection group on P1, two forward-paths (PE1-P1-PE2 and PE1-P1-PE1) are had,
Main tunnel and standby tunnel are corresponded to respectively.When configuring looped network protection group group on P1, configuration module adds a standby forwarding road
Footpath PE1-P1-PE1, the main forward-path of correspondence are PE1-P1-PE2.
When the upper looped network protection groups of 2.PE1 switch, handover module chooses standby forward-path (PE1-P1-PE1) as current
Forward-path, and label label1 setting tag-drops will be entered for tunnel so that the upper flows come in from standby tunnel of P1 are abandoned.
When on P1 in Fig. 4, looped network protection group is entered line command and switched, or the link looped network protection group that breaks down is cut between P1 and PE2
Change to standby rear link-recovery it is normal when, can switch in looped network protection group or looped network protection group on P1 and PE2 occur in the moment of switchback
The inconsistent situation of state (i.e. one end is being led in standby one end), and now primary link and standby link are all normal, due on now P1
Looped network protection group has switched, and understands now flow trend (CE1-PE1-P1-PE1- as shown in Figure 4 according to handover module process
P2-PE2-P1), if the flow come in from standby tunnel on P1 is not abandoned by handover module, a small amount of flow can be caused to form ring
Road produces certain line loss.But handover module arranges discarding can be caused packet loss when switching or switchback, affect switching
Energy.
For P equipment (by taking P1 in Fig. 5 as an example), the improvement project that the present invention takes is as follows：
1., when being configured without looped network protection group on P1, two forward-paths PE1-P1-PE2 and PE1-P1-PE1 are had, point
Dui Ying not main tunnel and standby tunnel.When configuring looped network protection group group on P1, configuration module adds two standby forward-paths
PE1-P1-PE1 and PE2-P1-PE2, it is PE1-P1-PE2 and PE1-P1-PE1 to correspond to main forward-path respectively.
When the upper looped network protection groups of 2.P1 switch, handover module chooses standby forward-path (PE1-P1-PE1 and PE2-P1-
PE2) as current forward-path, i.e., the flow come in from main tunnel walks standby forward-path (PE1-P1-PE1), from standby tunnel
The flow come in walks standby forward-path (PE2-P1-PE2).And with unlike former scheme, label will not be entered for tunnel
Label1 arranges tag-drop, and the flow so come in from standby tunnel will walk standby forward-path (PE2-P1-PE2).
When on P1 in Fig. 5 looped network protection group it is standby and leading on P1, as on now P1, looped network protection group has switched, root
Understand that now flow trend is as shown in Figure 5 (CE1-PE1-P1-PE1-P2-PE2-P1-PE2-CE2) according to handover module process, this
Sample process if will not be formed loop also will not packet loss, greatly improve performance of handoffs.
For P equipment, (by taking P1 in Fig. 6 as an example, P1 is configured with two main tunnels and standby tunnel and is the same from looped network protection
Group), former scheme is as follows：
1., when being configured without looped network protection group on P1, two forward-paths (PE1-P1-PE2 and PE1-P1-PE1) are had,
Main tunnel and standby tunnel are corresponded to respectively.When configuring looped network protection group group1 on P1, configuration module adds a standby forwarding
Path P E1-P1-PE1, the main forward-path of correspondence is PE1-P1-PE2, when configuring looped network protection group group2 on P1, configures mould
Block adds a standby forward-path PE2-P1-PE2, and the main forward-path of correspondence is PE2-P1-PE1.
When upper looped network protection groups group1 of 2.PE1 switch, handover module is chosen standby forward-path (PE1-P1-PE1) and is made
For current forward-path, i.e., the flow come in from main tunnel walks standby forward-path (CE1-PE1-P2), and will enter for tunnel
Label label1 arranges tag-drop so that the upper flows come in from standby tunnel of P1 are abandoned.
When on P1 in Fig. 6, looped network protection group group1 is entered line command and switched, or link breaks down protection group between P1 and PE2
Be switched to standby rear link-recovery it is normal when, can switch in looped network protection group or looped network protection on P1 and PE2 occur in the moment of switchback
The group inconsistent situation of state (i.e. one end is being led in standby one end), and now main/slave link is all normal, due to looped network on now P1
Protection group group1 has switched, and understands now flow trend (CE1-PE1-P1- as shown in Figure 6 according to handover module process
PE1-P2-PE2-P1), if the flow come in from standby tunnel on P1 is not abandoned by handover module, a small amount of flow shape can be caused
Certain line loss is produced into loop.But handover module arranges discarding can be caused packet loss when switching or switchback, affect to cut
Transsexual energy.
For P equipment, (by taking P1 in Fig. 7 as an example, P1 is configured with two main tunnels and standby tunnel and is the same from looped network protection
Group), the improvement project that the present invention takes is as follows：
1., when being configured without looped network protection group on P1, two forward-paths PE1-P1-PE2 and PE1-P1-PE1 are had, point
Dui Ying not main tunnel and standby tunnel.When configuring looped network protection group group1 on P1, configuration module adds a standby forwarding road
Footpath PE1-P1-PE1, the main forward-path of correspondence is PE1-P1-PE2, when configuring looped network protection group group2 on P1, configuration module
One standby forward-path PE2-P1-PE2 of addition, the main forward-path of correspondence are PE2-P1-PE1.
2. when confirming that the upper group1 of P1 are associated with group2 (main tunnel with standby tunnel all), group1 with
Group2 is processed as a looped network protection group, as long as one of looped network protection group is switched over, handover module will choose 2
The standby forward-path (PE1-P1-PE1 and PE2-P1-PE2) of individual looped network protection group as current forward-path, as long as that is, wherein
Standby, then 2 looped network protection groups are all to have effect (as shown in fig. 7, group1 is in standby association group2 to one looped network protection group
To have effect).
When upper looped network protection groups group1 of 3.P1 switch (now looped network protection group group2 does not switch), handover module choosing
Standby forward-path (PE1-P1-PE1 and PE2-P1-PE2) is taken as current forward-path, i.e., the flow come in from main tunnel is walked
Standby forward-path (PE1-P1-PE1), the flow come in from standby tunnel walk standby forward-path (PE2-P1-PE2).And and
Unlike former scheme, standby tunnel will not be entered label label1 and tag-drop is set, so from the flow come in for tunnel just
Standby forward-path (PE2-P1-PE2) can be walked.
When on P1 in Fig. 7 looped network protection group group1 standby and leading on P1, as now the upper 2 protection groups of P1 are associated
And group1 has switched, now flow trend (CE1-PE1-P1-PE1-P2- as shown in Figure 7 is understood according to handover module process
PE2-P1-PE2-CE2).Fig. 8 is place when two main tunnels and standby tunnel identical looped network protection group are arranged on core router
Reason flow chart, so process if will not be formed loop also will not packet loss, greatly improve performance of handoffs.
The method and device of raising T-MPLS link looped network protection performance of handoffs of the present invention, can improve looped network switching
Performance, while and switching moment traffic loops can be eliminated, greatly improve performance of handoffs.
It is described above to be merely exemplary for the purpose of the present invention, and it is nonrestrictive, and those of ordinary skill in the art understand,
In the case of the spirit and scope limited without departing from claims, many modifications, change or equivalent can be made, but all
To fall within the scope of protection of the present invention.
Claims (6)
1. a kind of method of raising T-MPLS link looped network protection performance of handoffs, it is characterised in that comprise the following steps：
Configuration step：When looped network protection group is configured with the router in the backbone network of T-MPLS links, configuration two is standby
Forward-path, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
Switch step：When looped network protection group switches on the router, two standby forward-paths are chosen as current forwarding
Standby forward-path corresponding with main tunnel is walked in path, the flow come in from main tunnel, the flow come in from standby tunnel walk with it is standby
The corresponding standby forward-path in tunnel.
2. the method for improving T-MPLS link looped network protection performance of handoffs as claimed in claim 1, it is characterised in that
The router is edge router and/or core router.
3. the method for improving T-MPLS link looped network protection performance of handoffs as claimed in claim 1, it is characterised in that
When the router is to be configured with two to have the main tunnel of identical and standby tunnel on core router, and the core router
During the looped network protection group in road, also include judging step between the configuration step and the switch step：Judge this two tools
Whether there is at least one looped network protection group to switch in having the looped network protection group in the main tunnel of identical and standby tunnel, if it is
Switch step is gone to, is otherwise terminated.
4. a kind of device of raising T-MPLS link looped network protection performance of handoffs, it is characterised in that including configuration module and switching
Module, wherein,
The configuration module, for when looped network protection group is configured with the router in the backbone network of T-MPLS links, configuring
Two standby forward-paths, two standby forward-paths correspond to main tunnel and standby tunnel respectively；
The handover module, for when looped network protection group switches on the router, choosing this two standby forward-path conducts
Current forward-path, the flow come in from main tunnel walk standby forward-path corresponding with main tunnel, from the stream that standby tunnel is come in
Amount walks standby forward-path corresponding with standby tunnel.
5. the device of T-MPLS link looped network protection performance of handoffs is improved as claimed in claim 4, it is characterised in that the road
It is edge router and/or core router by device.
6. the device of T-MPLS link looped network protection performance of handoffs is improved as claimed in claim 4, it is characterised in that also included
Judge module；
The judge module, is to be configured with two on core router, and the core router to have for working as the router
During the looped network protection group in the main tunnel of identical and standby tunnel, this two looped networks with the main tunnel of identical and standby tunnel are being judged
Whether there is at least one looped network protection group to switch in protection group, if it is start handover module.
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| CN103259721B (en) * | 2013-04-16 | 2016-08-17 | 杭州华三通信技术有限公司 | Message forwarding method in SPBM network and device |
| CN112019261B (en) * | 2019-05-31 | 2022-02-08 | 烽火通信科技股份有限公司 | Method and system for returning distributed control plane electrical layer 1+1 service |
| CN112311462B (en) * | 2020-11-05 | 2021-09-03 | 湖北工业大学 | Access layer equipment ring forming optimization method and system based on Packet Transport Network (PTN) |
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