CN100502306C - Service switching method and system for the boundary devices of the Ethernet operator - Google Patents
Service switching method and system for the boundary devices of the Ethernet operator Download PDFInfo
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- CN100502306C CN100502306C CNB2006100022345A CN200610002234A CN100502306C CN 100502306 C CN100502306 C CN 100502306C CN B2006100022345 A CNB2006100022345 A CN B2006100022345A CN 200610002234 A CN200610002234 A CN 200610002234A CN 100502306 C CN100502306 C CN 100502306C
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Abstract
The provided business switch for peripheral device of Ethernet provider comprises: for switching business, the Ethernet receiving device sends notice information to the sending peripheral device; the latter receives information for business switch. This invention can reduce switching time.
Description
Technical field
The present invention relates to field of network communication, relate in particular to the method and system that a kind of Ethernet provider edge equipment carries out switching services.
Background technology
Mac-in-Mac (Ethernet scheme) is the key technology of the PBB (Provider Backbone Bridges, provider backbone bridging) that provides of IEEE (IEEE) 802.1ah draft.Mac-in-Mac is by the mode at the outer outer MAC of interpolation of client's ethernet frame (media interviews control) head and srvice instance ID, client's Ethernet and operator's Ethernet are kept apart, thereby can solve in the past because Ethernet is used a series of problems that do not have level to cause.
IEEE 802.1ag has proposed the draft at the connectivity error management of Ethernet OAM (Operation and Maintenance and management), and this draft has defined a cover Ethernet detection of connectivity, fault location and isolating means end to end.Comprise PBT (Provider Backbone Transport, provider backbone transmission) scheme in this draft.
The PBT scheme is set up the tunnel by configuration mode, closes mac learning and multicast functionality, simplifies networking, satisfies point-to-point and uses.In this scheme, in order to satisfy the demand that Ethernet tunnel end to end connectivity detects, adopt 802.1ag CCM (detection of connectivity message) to improve, utilize clean culture CCM message to carry out the tunnel detection of connectivity.
A kind of method of carrying out switching services in Ethernet is in the prior art: at local terminal operator provider edge equipment (Provider Edge Device, PE) hop-by-hop configuration MAC+VLAN (VLAN) distinguishes different tunnels by different VLAN or MAC and on the Ethernet tunnel between the PE of opposite end.Detect the connectedness in tunnel by the CCM message that sends 802.1ag between local end PE and opposite end PE, because the tunnel fixes, so CCM adopts unicast message.When transmitting terminal PE or receiving terminal PE CCM take place when overtime (agreement regulation: can not receive the CCM message in continuous 3.5 message transmission cycles and regard as overtime), then transmitting terminal PE or receiving terminal PE trigger the operation of switching services, switch the business on the over run tunnel.
The shortcoming of said method is: in the method, may cause the literary composition that comes, repays between the PE to walk different paths under specific circumstances.Need the long time, transmitting terminal PE and receiving terminal PE could finish the operation of switching services.
Such as, in networking shown in Figure 1, when business is normally moved, for guarantee that discharge model is disposed easily and back and forth time delay differ minimum, PE1 transmits with the tunnel from main to the flow of PE1 with PE2 to the flow of PE2, does not have actual flow to transmit on the over run tunnel.
When above-mentioned main when use tunnel fails, when PE2 can not receive the clean culture CCM message that PE1 sends in Life Time (life span) section of configuration, then trigger switching services, PE2 is switched on the over run tunnel to the service traffics of PE1.When above-mentioned main fault with the tunnel is to lead when disconnecting the problem of a class with the tunnel physical link, then also can to detect CCM simultaneously overtime for PE1, and PE1 also can be switched on the over run tunnel to the service traffics of PE2.
But under considerable situation, single-pass may appear in the link between PE1 and the PE2, and promptly the two-way tunnel between PE1 and the PE2 has only a direction can have flow to pass through, such as PE1-〉the PE2 direction is obstructed, PE2-〉the PE1 direction is logical.Then this moment, through a Life Time week after date, it is overtime that PE2 can detect CCM, triggers switching services, and PE2 is switched on the over run tunnel to the service traffics of PE1.A Life Time cycle is generally the CCM message and sends at interval 3.5 times, and it is 10ms that the CCM message sends the interval minimum.
But this moment is because PE2-〉the PE1 direction is logical, and it is overtime that PE1 can not detect CCM simultaneously, and the service traffics of PE1 still send with the tunnel by main.Service traffics between PE2 and the PE1 as shown in Figure 2 at this moment.Through Life Time week after date, PE1 when can not receive the CCM message that PE2 sends with the tunnel, triggers switching services from main when again, and PE1 is switched on the over run tunnel to the flow of PE2.Therefore, realize the PE1-that breaks down〉business recovery of PE2 direction needs two Life Time cycles, and the business recovery time surpasses 70ms, the requirement that does not reach the 50ms business recovery.
In the prior art, also in time do not notify transmitting terminal to carry out switching services, guarantee the method for business recovery in the 50ms
Summary of the invention
The purpose of this invention is to provide the method and system that a kind of Ethernet provider edge equipment carries out switching services.Thereby can realize that when the Ethernet tunnel breaks down the two ends provider edge equipment in Ethernet tunnel is all finished the operation of switching services in the relatively shorter time.
The objective of the invention is to be achieved through the following technical solutions:
A kind of Ethernet provider edge equipment carries out the method for switching services, comprises the steps:
A, in networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive the service message of transmitting terminal provider edge equipment transmission in the life span Life Time of configuration after, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel, and in detection of connectivity message CCM message, increase announcement information, send this CCM message to the transmitting terminal provider edge equipment;
After B, described transmitting terminal provider edge equipment receive the CCM message of described receiving terminal provider edge equipment transmission, when detect this CCM message in carried described announcement information after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
Described steps A specifically comprises:
When the Ethernet tunnel that has between receiving terminal provider edge equipment and the transmitting terminal provider edge equipment more than two, in described announcement information, carry the tunnel mark information that is switched to of specifying.
Described steps A specifically comprises:
In networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive the service message of transmitting terminal provider edge equipment transmission in the Life Time of configuration after, in the fixing head of CCM message, mark is set, sends this CCM message to the transmitting terminal provider edge equipment.
Described steps A specifically comprises:
In networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive the service message of transmitting terminal provider edge equipment transmission in the Life Time of configuration after, in the CCM message, increase general extension or the customization type length value TLV of producer, send this CCM message to the transmitting terminal provider edge equipment.
Described steps A specifically comprises:
The type Type of described general extension TLV is by the 802.1ag normalized definition, and Value is set to mark, and length L ength determines according to the byte number that takies of Value value.
Described step B specifically comprises:
In networking based on the 802.1ag standard, after the transmitting terminal provider edge equipment receives the CCM message of receiving terminal provider edge equipment transmission, after having carried described mark in the fixing head that detects this CCM message, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
Described step B specifically comprises:
In networking based on the 802.1ag standard, after the transmitting terminal provider edge equipment receives the CCM message of receiving terminal provider edge equipment transmission, carried described general extension or the self-defined TLV of producer in detecting this CCM message after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
A kind of Ethernet provider edge equipment carries out the system of switching services, comprising:
Receiving terminal provider edge equipment: in networking based on the 802.1ag standard, after in the life span Life Time of configuration, not receiving the service message of transmitting terminal provider edge equipment transmission, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel, and in detection of connectivity message CCM message, increase announcement information, send this CCM message to the transmitting terminal provider edge equipment;
Transmitting terminal provider edge equipment: behind the CCM message that receives described receiving terminal provider edge equipment transmission, when detect this CCM message in carried described announcement information after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
Described receiving terminal provider edge equipment comprises:
The switching services processing module: be used for not receiving the service message that the transmitting terminal provider edge equipment sends in the Life Time of configuration after, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel;
Announcement information sending module: be used for when the switching services processing module is carried out switching services, in the CCM message, increasing announcement information, send this CCM message to the transmitting terminal provider edge equipment.
Described transmitting terminal provider edge equipment comprises:
Announcement information receiver module: be used to receive the described CCM message that described receiving terminal provider edge equipment sends, the announcement information in the described CCM message is passed to the switching services processing module;
The switching services processing module: after being used to receive the announcement information that the announcement information processing module passes over, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
As seen from the above technical solution provided by the invention, the present invention is by when the receiving terminal provider edge equipment carries out switching services, send announcement information to the transmitting terminal provider edge equipment, thereby can guarantee when the Ethernet tunnel breaks down, the two ends provider edge equipment in Ethernet tunnel is all finished the operation of switching services in the relatively shorter time.Basically realized synchronous switching.Improved service reliability.
In networking, send the clean culture CCM message of expansion by receiving terminal PE to transmitting terminal PE, thereby realized when the Ethernet tunnel breaks down, in 50ms, realizing business convergence based on the 802.1ag standard.
Description of drawings
Fig. 1 is under the normal condition, the service traffics path schematic diagram between PE2 and the PE1;
Fig. 2 is for after PE2 switches, the service traffics path schematic diagram between PE2 and the PE1;
Fig. 3 is the process chart of the specific implementation of the method for the invention;
Fig. 4 is the networking schematic diagram based on the 802.1ag standard of embodiment of the present invention;
Fig. 5 is the schematic diagram that mark is set in the fixed of CCM message header (fixing head) of the present invention;
Fig. 6 is the schematic diagram of the general format of expansion TLV of the present invention;
Fig. 7 is the schematic diagram of the general format of the self-defined TLV of producer of the present invention;
Fig. 8 is the structure chart of the specific implementation of system of the present invention.
Embodiment
The invention provides a kind of Ethernet provider edge equipment (Provider Edge Device, PE) carry out the method and system of switching services, core of the present invention is: the receiving terminal provider edge equipment is when carrying out switching services, send announcement information to the transmitting terminal provider edge equipment, after the transmitting terminal provider edge equipment receives this announcement information, carry out switching services immediately.
Describe the present invention in detail below in conjunction with accompanying drawing, above-mentioned provider edge equipment comprises PE such as router, switch and layer-3 switch, and the process chart of the specific implementation of the method for the invention comprises the steps: as shown in Figure 3
Step 3-1: receiving terminal PE does not carry out switching services receive the service message of transmitting terminal PE in the time of setting after, simultaneously, sends announcement information to transmitting terminal PE.
The receiving terminal PE in Ethernet tunnel does not carry out switching services receive the service message of transmitting terminal PE transmission in the time of setting after immediately, switches the business on the over run tunnel.Simultaneously, send announcement information to transmitting terminal PE.This announcement information will notify transmitting terminal PE to carry out switching services.In the networking based on the 802.1ag standard, this announcement information can be realized by clean culture CCM message is expanded.This announcement information also can not be packaged among the CCM but send to transmitting terminal PE by receiving terminal PE separately, perhaps adopts alternate manner to send to transmitting terminal PE by receiving terminal PE.
When the Ethernet tunnel that has between receiving terminal PE and the transmitting terminal PE more than two, in described announcement information, carry the information that is switched to which bar tunnel or tunnel ID of specifying.
Such as, in the networking based on the 802.1ag standard shown in Figure 4, when PE2 does not receive the service message of PE1 in a Life Time cycle after, promptly PE2 detect the CCM message overtime after, carry out switching services immediately, with PE2-〉service traffics of PE1 direction are switched on the over run tunnel.Send the clean culture CCM message of expansion simultaneously to PE1.
The clean culture CCM message of above-mentioned expansion has 3 kinds of following implementations:
1, in the fixed of CCM message header, mark is set.Such as, as shown in Figure 5, in the fixed header of the PDU of CCM message (protocol Data Unit), utilize certain bit that mark is set, the grey color part that this is labeled as among Fig. 5 carries the information that transmitting terminal PE carries out switching services in this mark.
2, in the CCM message, increase a general extension TLV (type lengths values).This general extension TLV can be referred to as " synchronous switching " TLV, and its form as shown in Figure 6.The Type of this general extension TLV can be by the 802.1ag normalized definition, and Length takies byte number according to actual Value value and determines.General Value can be set to a mark, takies a byte, and Length is 1 like this; Also Value can be designated tunnel sequence number (which bar tunnel in a tunnel) or tunnel ID.
3, in the CCM message, increase the self-defined TLV of producer.The form of this self-defined TLV as shown in Figure 7.Carry the information that transmitting terminal PE carries out switching services among this self-defined TLV.
Step 3-2: after transmitting terminal PE receives announcement information, carry out switching services immediately.
After transmitting terminal PE receives the announcement information of receiving terminal PE transmission, according to the switch messages of carrying in this announcement information, carry out switching services immediately, switch the business on the corresponding over run tunnel, thereby guaranteed that transmitting terminal PE and receiving terminal PE carry out switching services in the shortest time, switch the business on the identical over run tunnel.
Such as, in the networking based on the 802.1ag standard shown in Figure 4, after PE1 receives the clean culture CCM message of the above-mentioned expansion that PE2 sends, after finding such as, PE1 to be provided with above-mentioned mark among the fixed header of PDU of the clean culture CCM message that PE2 sends over; Perhaps, after PE1 finds to have carried above-mentioned general extension TLV or the self-defined TLV of producer in the clean culture CCM message that PE2 sends over.The switch messages of carrying in the clean culture CCM message according to this expansion is carried out service traffics immediately and is switched, and service traffics are switched on the corresponding over run tunnel.
When configuration 10ms sends a CCM message, by this method, can be in the time of 45ms (35ms+10ms), PE2 and PE1 can both finish professional switching, and satisfy the requirement of service disconnection cycle less than 50ms.
In actual applications, when relating to producer's intercommunication, the realization of distinct device may be not exclusively the same, and for the equipment of realizing according to the 802.1ag standard, this programme is compatible.When PE finds unacquainted mark or TLV, directly abandon this mark or TLV and get final product, switch according to existing technical scheme.
The structure chart of the specific implementation of system of the present invention comprises as shown in Figure 8:
Receiving terminal provider edge equipment: after in the time of setting, not receiving the service message of transmitting terminal provider edge equipment transmission, the receiving terminal provider edge equipment is carried out switching services to the business that the transmitting terminal provider edge equipment sends, and send announcement information to the transmitting terminal provider edge equipment.The receiving terminal provider edge equipment comprises: announcement information sending module and switching services processing module.
The transmitting terminal provider edge equipment: after receiving the announcement information that the receiving terminal provider edge equipment sends, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.The receiving terminal provider edge equipment comprises: announcement information receiver module and switching services processing module.
The switching services processing module of receiving terminal provider edge equipment wherein: be used for not receiving the service message that the transmitting terminal provider edge equipment sends in the time of setting after, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel.
The announcement information sending module of receiving terminal provider edge equipment wherein: be used for when the switching services processing module is carried out switching services, send announcement information to the transmitting terminal provider edge equipment.
The announcement information receiver module of transmitting terminal provider edge equipment wherein: be used to receive the announcement information that the receiving terminal provider edge equipment sends, this announcement information is passed to the switching services processing module.
The switching services processing module of transmitting terminal provider edge equipment wherein: after being used to receive the announcement information that the announcement information processing module passes over, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of Ethernet provider edge equipment carries out the method for switching services, it is characterized in that, comprises the steps:
A, in networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive the service message of transmitting terminal provider edge equipment transmission in the life span Life Time of configuration after, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel, and in detection of connectivity message CCM message, increase announcement information, send this CCM newspaper zhang to the transmitting terminal provider edge equipment;
After B, described transmitting terminal provider edge equipment receive the CCM message of described receiving terminal provider edge equipment transmission, when detect this CCM message in carried described announcement information after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
When the Ethernet tunnel that has between receiving terminal provider edge equipment and the transmitting terminal provider edge equipment more than two, in described announcement information, carry the tunnel mark information that is switched to of specifying.
3, method according to claim 1 is characterized in that, described steps A specifically comprises:
In networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive the service message of transmitting terminal provider edge equipment transmission in the Life Time of configuration after, in the fixing head of CCM message, mark is set, sends this CCM message to the transmitting terminal provider edge equipment.
4, method according to claim 1 is characterized in that, described steps A specifically comprises:
In networking based on the 802.1ag standard, the receiving terminal provider edge equipment does not receive business newspaper that the transmitting terminal provider edge equipment sends zhang in the Life Time of configuration after, in the CCM message, increase general extension or the customization type length value TLV of producer, send this CCM message to the transmitting terminal provider edge equipment.
5, method according to claim 4 is characterized in that, described steps A specifically comprises:
The type Type of described general extension TLV is by the 802.1ag normalized definition, and Value is set to mark, and length L ength determines according to the byte number that takies of Value value.
6, method according to claim 3 is characterized in that, described step B specifically comprises:
In networking based on the 802.1ag standard, after the transmitting terminal provider edge equipment receives the CCM message of receiving terminal provider edge equipment transmission, after having carried described mark in the fixing head that detects this CCM newspaper zhang, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
7, according to claim 4 or 5 described methods, it is characterized in that described step B specifically comprises:
In networking based on the 802.1ag standard, after the transmitting terminal provider edge equipment receives the CCM message of receiving terminal provider edge equipment transmission, carried described general extension or the self-defined TLV of producer in detecting this CCM message after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
8, a kind of Ethernet provider edge equipment carries out the system of switching services, it is characterized in that, comprising:
Receiving terminal provider edge equipment: in networking based on the 802.1ag standard, after in the life span Life Time of configuration, not receiving the service message of transmitting terminal provider edge equipment transmission, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel, and in detection of connectivity message CCM message, increase announcement information, send this CCM message to the transmitting terminal provider edge equipment;
Transmitting terminal provider edge equipment: behind the CCM message that receives described receiving terminal provider edge equipment transmission, when detect this CCM message in carried described announcement information after, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
9, system according to claim 8 is characterized in that, described receiving terminal provider edge equipment comprises:
The switching services processing module: be used for not receiving the service message that the transmitting terminal provider edge equipment sends in the Life Time of configuration after, the switching services that the receiving terminal provider edge equipment is sent to the transmitting terminal provider edge equipment is to over run tunnel;
Announcement information sending module: be used for when the switching services processing module is carried out switching services, in the CCM message, increasing announcement information, send this CCM message to the transmitting terminal provider edge equipment.
10, system according to claim 9 is characterized in that, described transmitting terminal provider edge equipment comprises:
Announcement information receiver module: be used to receive the described CCM message that described receiving terminal provider edge equipment sends, the announcement information in the described CCM message is passed to the switching services processing module;
The switching services processing module: after being used to receive the announcement information that the announcement information processing module passes over, the switching services that the transmitting terminal provider edge equipment is sent to the receiving terminal provider edge equipment is to corresponding over run tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100022345A CN100502306C (en) | 2006-01-24 | 2006-01-24 | Service switching method and system for the boundary devices of the Ethernet operator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100022345A CN100502306C (en) | 2006-01-24 | 2006-01-24 | Service switching method and system for the boundary devices of the Ethernet operator |
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| Publication Number | Publication Date |
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| CN101009585A CN101009585A (en) | 2007-08-01 |
| CN100502306C true CN100502306C (en) | 2009-06-17 |
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| CNB2006100022345A Expired - Fee Related CN100502306C (en) | 2006-01-24 | 2006-01-24 | Service switching method and system for the boundary devices of the Ethernet operator |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102025585A (en) * | 2009-09-09 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for protecting Ethernet tunnel |
| CN102315962B (en) * | 2011-07-07 | 2014-02-26 | 杭州华三通信技术有限公司 | Method for detecting MTU (Maximum Transmission Unit) of Ethernet and maintenance end point |
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Granted publication date: 20090617 Termination date: 20190124 |