CN101883040B - Network protection method and network protection architecture - Google Patents
Network protection method and network protection architecture Download PDFInfo
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- CN101883040B CN101883040B CN200910083191.1A CN200910083191A CN101883040B CN 101883040 B CN101883040 B CN 101883040B CN 200910083191 A CN200910083191 A CN 200910083191A CN 101883040 B CN101883040 B CN 101883040B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 19
- 238000005538 encapsulation Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 238000007726 management method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 230000006855 networking Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
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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
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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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
- H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
Abstract
The invention provides a network protection method and a network protection system. In a PBB-TE-based network, a local network is determined, and a working section and a protection section are set in the determined local network. When a path of the working section goes wrong, only the traffic of the path of the working section is switched to a path of the protection section, but the whole paths are not switched, so the speed of fault recovery is improved, and the nodes in relation to protection switching are decreased.
Description
Technical field
The present invention relates to network protection technique; network protection method and the network protection systems of the operator backbone bridging technology (PBB-TE, Provider Backbone Bridge Traffic Engineering) of traffic engineering is espespecially namely supported based on Carrier-class Ethernet technology.
Background technology
The features such as simple, the efficient and low cost that ethernet technology has due to himself, be widely used in a local network, and just rapid be that main networking technology is to the networking technology development on a large scale such as enterprise network, metropolitan area telecommunications network and wide area telecommunications net from local area network (LAN), therefore, carrier-class ethernet technology is arisen at the historic moment.
IEEE-USA (IEEE, Institute of Electrical and Electronics Engineers) proposes Carrier-class Ethernet technology and PBB-TE, and corresponding standard is IEEE802.1Qay.PBB-TE is also referred to as operator backbone transmission (PBT, Provider Backbone Transport) technology, and be a kind of connection-oriented ethernet technology, all flows forward according to address table.PBB-TE technology is with operator backbone bridge joint (PBB; Provider Backbone Bridge; corresponding standard is IEEE802.1ah) based on technology; its core is the improvement to PBB technology; by network management and control; the business in Ethernet is made in fact to have connectivity; to realize pretection switch, Operations, Administration and Maintenance (OAM; Operation; Administrationand Management), the function of the communication network such as service quality (QoS, Quality of Service), traffic engineering.PBB-TE technology adopts outer MAC to add outer VLAN (VLAN, Virtual Local Area Network) namely backbone network target MAC (Media Access Control) address (B-DA) and backbone network VLAN ID (B-VID) carry out business forwarding, its forward-path is pre-configured.The framework of PBB-TE technical compatibility traditional ethernet bridge, not needing to carry out renewal to nodes can forward Frame based on B-DA and B-VID, and Frame does not need amendment yet, and forward efficiency is high.
In order to improve the reliability of network; protection mechanism is end to end adopted based in the network of PBB-TE; namely two tunnel entities are had between end-to-end; be respectively work entity and protection entity; and adopt the connectivity fault management in IEEE802.1ag (CFM, Connectivity Fault Management) mechanism to carry out state-detection respectively to work entity and protection entity constantly.When work entity lost efficacy, business automatically transferred on the protection entity set up in advance, this protection mechanism end to end added necessary elasticity to PBB-TE network.Fig. 1 is the structural representation of prior art based on protection mechanism end-to-end in the network of PBB-TE; as shown in Figure 1; in a PBB-TE network; PE1 and PE2 is two end nodes of work entity and protection entity; the path of work entity is PE1-P1-P2-P3-PE2, and the path of protection entity is PE1-P4-P5-PE2.Work entity and protection entity are previously provided with respective VLAN.
When flow enters PBB-TE network, end node is (as the node PE1 in Fig. 1, also referred to as fringe node) according to the information such as inbound port and VLAN of frame in this flow, this frame is encapsulated as the frame format in PBB-TE network, namely on initial data frame head, encapsulates one deck frame head again.In the frame head of new encapsulation, the source MAC in backbone MAC address (B-MAC) is the MAC Address into end node and PE1, and target MAC (Media Access Control) address is the MAC Address end node and PE2.In addition, also encapsulate the information such as the label (I-tag) of service VLAN and B-VID in new frame head, wherein B-VID is the VLAN selecting the work entity of transmission or protection entity to pre-set.
When work entity and protection entity are all normal condition, the B-VID of frame in flow is encapsulated as the VLAN of work entity by PE1, and flow transmits from work entity, and its transmission path is PE1-P1-P2-P3-PE2, as shown in Figure 1.When work entity breaks down; the B-VID of frame in flow is encapsulated as the VLAN of protection entity by PE1; flow switch transmits to protection entity; its transmission path is PE1-P4-P5-PE2; as shown in Figure 2, Fig. 2 is that prior art is based on the flow schematic diagram after the network generation protection switching of PBB-TE.
When traffic transport to another one end node (as Fig. 1 interior joint PE2, also referred to as the fringe node) of PBB-TE network time, this goes out after the frame in PBB-TE network is reduced to general data frame format by end node to export.
From the structure of current end-to-end protection mechanism; protection end to end can only carry out complete trails protection; like this; for the situation that work entity is all very long with the path of protection entity; the probability that work entity and protection entity break down simultaneously is just larger; if work entity and protection entity break down simultaneously, then flow will be lost end to end.For the situation of a certain section of fragile especially or a certain section of particular importance in the path of work entity or protection entity, the fault of this section can cause complete trails to switch, and is unfavorable for the optimization of network.Existing based on protection mechanism framework end-to-end in the network of PBB-TE; due to complete trails protection can only be carried out, slow down the speed of fault recovery, and pretection switch involves all nodes in complete trails; be unfavorable for the optimization of network, and reduce the reliability of end-to-end flux.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of network protection method, can improve the speed of fault recovery, reduces the node of pretection switch, is conducive to the optimization of network, and ensures the reliability of end-to-end flux.
Another object of the present invention is to provide a kind of network protection systems, the speed of fault recovery can be improved, reduce the node of pretection switch, be conducive to the optimization of network, and ensure the reliability of end-to-end flux.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of network protection method, in the network of the operator backbone bridging technology PBB-TE based on support traffic engineering, the method comprises the following steps:
Active section and protection section are set in the localized network determined;
Judge whether by active section delivery flow rate, if so, active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame; Active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward; Process ends;
If not, the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission; Protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward.
Described localized network is determined according to the actual conditions of network.
In the end node of described active section and protection section, at least there is an end node is same end node.
The virtual LAN VLAN of described active section converting flow is different from the VLAN of protection section converting flow.
Described judging whether is comprised by the method for active section delivery flow rate: carry out state-detection to active section and protection section, and when testing result display active section and protection section are normally, and during unprotect switching request, protected flow is transmitted by active section; When testing result display active section breaks down, or when having other pretection switch requests, protected flow is by the transmission of protection section.
Described condition detection method is connectivity fault management CFM mechanism.
The transformat that the Frame received is packaged into active section specifically comprises by the end node that enters of described active section:
The backbone network VLAN ID B-VID of the protected Frame received from localized network outside is replaced with the VLAN of active section; source address in Frame backbone MAC address B-MAC is replaced with the node MAC addr entering end node of active section, destination address replaces with the node MAC addr end node of active section.
Described protection section enter end node the Frame received is packaged into protection section transformat specifically comprise:
The B-VID of the protected Frame received from localized network outside is replaced with the VLAN of active section; source address in Frame B-MAC is replaced with the node MAC addr entering end node of protection section, destination address replaces with the node MAC addr end node of protection section.
A kind of network protection systems, in the network of operator backbone bridging technology PBB-TE of traffic engineering, is comprising the localized network determined based on supporting, and, in the localized network determined, be provided with active section and protection section;
When by active section delivery flow rate time, active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame; Active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward;
When by protection section delivery flow rate, the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission; Protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward.
In the end node of described active section and protection section, at least there is an end node is same end node.
The VLAN of described active section converting flow is different from the VLAN of protection section converting flow.
As can be seen from technical scheme provided by the invention, based in the network of PBB-TE, determine localized network, and active section and protection section are set in the localized network determined.When this active section path fails, just by the flow switch in this active section path on its protection section path, instead of carry out the switching of complete trails, which enhance the speed of fault recovery, and decrease the node that pretection switch relates to.The present invention program is conducive to the optimization of network, and ensure that the reliability of end-to-end flux.Wherein, localized network refers to a part of network in protected network, can be called regional area, also can the section of being called or segmented network; be determine according to the actual conditions of network in advance, such as some section that is fragile especially or particular importance can be set to regional area.The protection of localized network herein also can be called regional area protection or locality protection, also can be called segment protect or sectionalised protection, can also have other similar titles.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art based on protection mechanism end-to-end in the network of PBB-TE;
Fig. 2 is that prior art is based on the flow schematic diagram after the network generation protection switching of PBB-TE;
Fig. 3 is the flow chart that the present invention realizes the method for network protection;
Fig. 4 is the structural representation of localized network protection mechanism in the network that the present invention is based on PBB-TE;
Fig. 5 is that the flow schematic diagram after switching occurs to protect the network that the present invention is based on PBB-TE.
Embodiment
Fig. 3 is the flow chart that the present invention realizes the method for network protection, as shown in Figure 3, based in the network of PBB-TE, comprises the following steps:
Step 300: active section and protection section are set in the localized network determined.
Localized network refers to a part of network in protected network; regional area can be called; also can the section of being called or segmented network, be determine according to the actual conditions of network in advance, such as some section that is fragile especially or particular importance can be set to regional area.The protection of localized network herein also can be called regional area protection or locality protection, also can be called segment protect or sectionalised protection, can also have other similar titles.
The end of active section and protection section has two end nodes respectively, and the end node of active section and protection section has at least a coincidence to be same end node.Entering on end node to be provided with active section port and protection section port, going out on end node to be provided with active section port and protection section port.
Pre-set the address table of traffic forwarding in node in active section and protection section, wherein, for active section converting flow VLAN with protect the VLAN of section converting flow to be different.Concrete method to set up belongs to the effective technological means of those skilled in the art, repeats no more here.
This step it is emphasised that based in the network of PBB-TE, determine the localized network needing to carry out protecting, and arranges active section and protection section in the localized network determined.Wherein localized network can be one or more, and the situation that concrete quantity and actual needs carry out protecting is relevant.
Step 301: judge whether, by active section delivery flow rate, if so, to enter step 302, otherwise enter step 304.
State-detection is carried out to active section and protection section; connectivity fault management (the CFM in IEEE802.1ag can be adopted; Connectivity Fault Management) mechanism constantly to active section and protection section carry out state-detection respectively, obtain active section and protection section testing result.
According to testing result, determine to transmit protected flow on active section or protection section.When testing result display active section and protection section are normally, and during unprotect switching request, protected flow transmits on active section; When testing result display active section breaks down, or when having other pretection switch requests, protected flow transmits in protection section.
It should be noted that, in this step, prior art is belonged to for the state-detection of active section and protection section, the existing method except CFM mechanism can be adopted, do not limit the scope of the invention.
Step 302: active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame.
When Frame enter active section enter end node time; the B-VID of the protected Frame received from localized network outside is replaced with the VLAN of active section; source address in Frame B-MAC is replaced with the node MAC addr entering end node of active section; destination address replace with active section go out the node MAC addr of end node after, by active section port, dataframe is gone out end node to active section.
Step 303: active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward.Process ends.
When active section go out the Frame that end node receives on active section time, forward after B-MAC and B-VID of Frame being reduced to the value before entering active section.
Step 304: the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission.
When Frame enter protection section enter end node time; the B-VID of the protected Frame received from localized network outside is replaced with the VLAN of active section; source address in Frame B-MAC is replaced with the node MAC addr entering end node of protection section; destination address replace with protection section go out the node MAC addr of end node after, that dataframe given protection section by protection section port goes out end node.
Step 305: protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward.
When active section go out the Frame that end node receives on active section time, forward after B-MAC and B-VID of Frame being reduced to the value before entering active section.
Method shown in corresponding diagram 3, the present invention also provides a kind of network protection systems, in the network of operator backbone bridging technology PBB-TE of traffic engineering, is comprising the localized network determined based on supporting, further, in the localized network determined, be provided with active section and protection section;
When by active section delivery flow rate time, active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame; Active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward;
When by protection section delivery flow rate, the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission; Protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward.
Wherein, in the end node of active section with protection section, at least there is an end node is same end node.And the VLAN of described active section converting flow is different from the VLAN of protection section converting flow.
Below in conjunction with an embodiment, the inventive method is specifically described.
Fig. 4 is the structural representation of localized network protection mechanism in the network that the present invention is based on PBB-TE, and as shown in Figure 4, PE1-P1-P2-P3-PE2 is certain traffic transport entity based on the network of PBB-TE technology, PE1 and PE2 is end node.Suppose, P1-P2-P3 is the active section of localized network protection in the present embodiment, and P1-P4-P3 is the protection section of localized network protection in the present embodiment, and active section and protection section have identical end node P1 and P3.When Frame transmits to the network based on PBB-TE technology from PE1 node, source address in the B-MAC of Frame is the node MAC addr of PE1, destination address is the node MAC addr of PE2, and B-VID is VLAN (being assumed to be VID1 here) pre-configured on this traffic transport entity.
When the path on testing result display active section is normal, Frame enters end node P1 by Reseal at active section, source address in the B-MAC of frame is replaced by the node MAC addr of P1, destination address is replaced by the node MAC addr of P3, B-VID is replaced by the VLAN (being assumed to be VID2) that this active section configures, wherein VID1 with VID2 can identical also can not be identical.Afterwards, flow encapsulation obtained sends to the end node that goes out of active section.When data frame transfer to active section go out end node P3 after, data frame recovery be enter localized network before frame information, source address in the B-MAC of i.e. Frame is reduced to the node MAC addr of PE1, destination address is reduced to the node MAC addr of PE2, and B-VID is reduced to the VID1 that traffic transport entity configures.
When testing result display active section breaks down, or when there are other pretection switch requests, protected flow switch is transmitted on protection section.As shown in Figure 5, Fig. 5 is that the flow schematic diagram after switching occurs to protect the network that the present invention is based on PBB-TE.Frame enters end node P1 by Reseal protection section; source address in the B-MAC of Frame is replaced by the node MAC addr of P1; destination address is replaced by the node MAC addr end node P3 of protection section; B-VID is then replaced by VLAN (being assumed to be VID3) pre-configured in protection section; afterwards, send encapsulating the flow obtained to protecting the end node that of section.When data frame transfer to protection section go out end node after; frame information before Frame is reduced to and enters localized network; source address in the B-MAC of i.e. Frame is reduced to the node MAC addr of PE1; destination address is reduced to the node MAC addr of PE2, and B-VID is reduced to the VID1 that this transmission entity configures.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. a network protection method, is characterized in that, in the network of the operator backbone bridging technology PBB-TE based on support traffic engineering, the method comprises the following steps:
Active section and protection section are set in the localized network determined; Described localized network is a part of network in protected network;
Judge whether by active section delivery flow rate, if so, active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame; Active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward; Process ends;
If not, the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission; Protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward; Wherein,
The transformat that the Frame received is packaged into active section specifically comprises by the end node that enters of described active section: the VLAN backbone network VLAN ID B-VID of the protected Frame received from localized network outside being replaced with active section, source address in Frame backbone MAC address B-MAC is replaced with the node MAC addr entering end node of active section, destination address replaces with the node MAC addr end node of active section;
The transformat that the Frame received is packaged into protection section by end node that enters of described protection section specifically comprises: the VLAN B-VID of protected Frame received from localized network outside being replaced with active section; source address in Frame B-MAC is replaced with the node MAC addr entering end node of protection section, destination address replaces with the node MAC addr end node of protection section.
2. network protection method according to claim 1, is characterized in that, determines described localized network according to the actual conditions of network.
3. network protection method according to claim 1, is characterized in that, in the end node of described active section and protection section, at least there is an end node is same end node.
4. network protection method according to claim 1, is characterized in that, the virtual LAN VLAN of described active section converting flow is different from the VLAN of protection section converting flow.
5. network protection method according to claim 1, it is characterized in that, described judging whether is comprised by the method for active section delivery flow rate: carry out state-detection to active section and protection section, when testing result display active section and protection section are normally, and during unprotect switching request, protected flow is transmitted by active section; When testing result display active section breaks down, or when having other pretection switch requests, protected flow is by the transmission of protection section.
6. network protection method according to claim 1, is characterized in that, described condition detection method is connectivity fault management CFM mechanism.
7. a network protection systems, is characterized in that, in the network of operator backbone bridging technology PBB-TE of traffic engineering, is comprising the localized network determined based on supporting, and, in the localized network determined, be provided with active section and protection section; Described localized network is a part of network in protected network;
When by active section delivery flow rate time, active section enter the transformat that the Frame received is packaged into active section by end node, and by active section port transmission encapsulation after Frame; Active section to go out end node be the frame information that enters before active section enters end node by data frame recovery and forward;
When by protection section delivery flow rate, the Frame received is packaged into the transformat protecting section by the end node that enters of protection section, and by the Frame after the encapsulation of protection section port transmission; Protection section go out end node by data frame recovery be enter protection section enter end node before frame information and forward; Wherein,
The transformat that the Frame received is packaged into active section specifically comprises by the end node that enters of described active section: the VLAN backbone network VLAN ID B-VID of the protected Frame received from localized network outside being replaced with active section, source address in Frame backbone MAC address B-MAC is replaced with the node MAC addr entering end node of active section, destination address replaces with the node MAC addr end node of active section;
The transformat that the Frame received is packaged into protection section by end node that enters of described protection section specifically comprises: the VLAN B-VID of protected Frame received from localized network outside being replaced with active section; source address in Frame B-MAC is replaced with the node MAC addr entering end node of protection section, destination address replaces with the node MAC addr end node of protection section.
8. network protection systems according to claim 7, is characterized in that, in the end node of described active section and protection section, at least there is an end node is same end node.
9. network protection systems according to claim 7, is characterized in that, the VLAN of described active section converting flow is different from the VLAN of protection section converting flow.
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| CN200910083191.1A CN101883040B (en) | 2009-05-05 | 2009-05-05 | Network protection method and network protection architecture |
| PCT/CN2009/074592 WO2010127533A1 (en) | 2009-05-05 | 2009-10-23 | Network protection method and network protection framework |
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| CN200910083191.1A CN101883040B (en) | 2009-05-05 | 2009-05-05 | Network protection method and network protection architecture |
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| US7920466B2 (en) * | 2007-01-11 | 2011-04-05 | Cisco Technology, Inc. | Protection of hierarchical tunnel head-end nodes |
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