CN110071830A - Pseudo-wire switchback method and device - Google Patents
Pseudo-wire switchback method and device Download PDFInfo
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- CN110071830A CN110071830A CN201910300617.8A CN201910300617A CN110071830A CN 110071830 A CN110071830 A CN 110071830A CN 201910300617 A CN201910300617 A CN 201910300617A CN 110071830 A CN110071830 A CN 110071830A
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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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Abstract
The present invention provides a kind of pseudo-wire switchback method and device, this method comprises: when the determination of the first PE equipment needs to initiate PW switchback, the first tag distribution protocol LDP notification message is sent to the 2nd PE equipment, the first LDP notification message includes the mark of the first main PW and the preferential forwarding flag bit with the first value；When receiving the 2nd LDP notification message of the 2nd PE equipment transmission, the value of the preferential forwarding flag bit of the first main PW is updated to the first value, the 2nd LDP notification message includes the mark of the first main PW and the preferential forwarding flag bit with the first value；Wherein, when the value of the value of the preferential forwarding flag bit of the main PW in PE equipment and the preferential forwarding flag bit of the corresponding standby PW of the main PW is the first value, determine that the main PW is active state, standby PW is armed state.The efficiency of PW switchback can be improved using the embodiment of the present invention.
Description
Technical field
The present invention relates to network communication technology field more particularly to a kind of pseudo-wire switchback method and devices.
Background technique
In the networking (being properly termed as active and standby PW networking) of pseudo-wire (English: Pseudo wire, abbreviation: PW) 1:1 redundancy protecting
In, main PW and standby PW are mutually redundant protection.Under normal circumstances, main PW is with that is, by main PW converting flow；Standby PW is as redundancy
Protection is then switched to when main PW breaks down through standby PW converting flow.
Independent manipulation mode (English: Independent Operation Mode) is two kinds of operation moulds of PW redundancy protecting
One of formula.In this mode, the service provider network edge (English: Provider Edge, abbreviation: PE) at the both ends redundancy PW
Equipment independently operates, respectively determine PW local end PE equipment activity/armed state, and PW local end PE equipment work
Dynamic/armed state informs far-end PE equipment.Both ends PE equipment is respectively according to every PW in local end PE equipment and far-end PE equipment
State independently determines activity/armed state of the PW.
Under independent manipulation mode, PW switches the movement for needing to coordinate the both ends PW PE equipment.Initiate the PE equipment of PW switching
Switching request is issued to far-end PE equipment first, only after the certainty for obtaining far-end PE equipment is responded, PW handoff procedure is
It can continue.
However practice discovery realizes PW switchback for the PW1:1 redundancy protecting networking under independent manipulation mode that works
Multiple interactive tag distribution protocol (English: Label Distribution Protocol, abbreviation: LDP) notification message is needed,
PW switchback efficiency is lower.
Summary of the invention
In view of this, the present invention provides a kind of pseudo-wire switchback method and device, to solve existing pseudo-wire switchback scheme efficiency
Lower problem.
In a first aspect, the present invention provides a kind of pseudo-wire switchback method, applied to the first clothes in PW1:1 redundancy protecting networking
Business provider network edge PE equipment, the first PE equipment are connect by active and standby PW with the 2nd PE equipment respectively, the method
Include:
When the first PE equipment, which determines, needs to initiate PW switchback, the 2nd PE equipment of Xiang Suoshu sends the first label distribution
Agreement LDP notification message, the first LDP notification message include the mark of the first main PW and the preferential forwarding with the first value
Flag bit；
When receiving the 2nd LDP notification message that the 2nd PE equipment is sent, preferential by the described first main PW turns
The value of hair flag bit is updated to first value, and the 2nd LDP notification message includes the mark and tool of the described first main PW
There is the preferential forwarding flag bit of first value；
Wherein, when the value of the preferential forwarding flag bit of the main PW in PE equipment and the preferential of the corresponding standby PW of the main PW turn
When the value of hair flag bit is first value, determine that the main PW is active state, standby PW is armed state.
Second aspect, the present invention provide a kind of pseudo-wire switchback device, applied to the first clothes in PW1:1 redundancy protecting networking
Business provider network edge PE equipment, the first PE equipment are connect by active and standby PW with the 2nd PE equipment respectively, described device
Include:
Transmission unit, for when determination needs to initiate PW switchback, the 2nd PE equipment of Xiang Suoshu to send the first label distribution
Agreement LDP notification message, the first LDP notification message include the mark of the first main PW and the preferential forwarding with the first value
Flag bit；
Receiving unit, the LDP notification message sent for receiving the 2nd PE equipment；
Switch unit, for receiving the 2nd LDP notification message that the 2nd PE equipment is sent when the receiving unit
When, the value of the preferential forwarding flag bit of the described first main PW is updated to first value, the 2nd LDP notification message includes
The mark of the first main PW and preferential forwarding flag bit with first value；
Wherein, when the value of the preferential forwarding flag bit of the main PW in PE equipment and the preferential of the corresponding standby PW of the main PW turn
When the value of hair flag bit is first value, determine that the main PW is active state, standby PW is armed state.
Using technical solution disclosed by the invention, by the way that the priority of main PW is set above the corresponding standby PW of main PW,
I.e. when the value of the preferential forwarding flag bit of the main PW in PE equipment and the value of the preferential forwarding flag bit of the corresponding standby PW of main PW
When being the first value, which determines that main PW is active state, and standby PW is armed state, in turn, when needing to carry out PW switchback
When, the PE equipment for initiating PW switchback can notify far-end PE equipment by the preferential forwarding flag bit of main PW by LDP notification message
Value be updated to the first value, and when receiving far-end PE equipment and requesting to carry out the LDP notification message of certainty response to switchback,
The value of the preferential forwarding flag bit of the main PW of local terminal is updated to the first value, without passing through LDP message to the preferential of standby PW
The value of forwarding flag bit is updated, and is reduced the quantity of the LDP notification message of interaction in PW switchback process, is improved PW switchback
Efficiency.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of PW switchback method provided in an embodiment of the present invention；
Fig. 2 is a kind of configuration diagram of concrete application scene provided in an embodiment of the present invention；
Fig. 3 is the PE reference model schematic diagram in PW1:1 redundancy protecting networking provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of PW switchback device provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention；
Fig. 8 is a kind of hardware structural diagram of PW switchback device provided in an embodiment of the present invention.
Specific embodiment
Technical solution in embodiment in order to enable those skilled in the art to better understand the present invention, below first to independence
The PW switchback process under related notion and independent manipulation mode in the prior art in operation mode is illustrated.
1, can work PW (UP Pseudo wire): there is no the PW of any hardware fault and software misconfiguration, can be just
Often transmit data.
2, can not work PW (Down Pseudo wire): there are hardware fault or/and the PW of software misconfiguration, can not
For transmitting data.
3, it activity PW (Active Pseudo wire): is mutually redundant in the PW of protection at one group, for transmitting Business Stream
The PW that works of amount.
4, active state (Active State): it is allowed to the state of the PW that works of transmission service traffics.It wherein, can work
Make PW when both ends PE equipment allows to transmit service traffics, i.e., the PW that can work is in active state in the PE equipment of both ends
When, which is activity PW.
5, await orders PW (Standby Pseudo wire): being mutually redundant in the PW of protection at one group, does not transmit service traffics
, the PW that works for playing redundancy protecting.Wherein, although the PW that awaits orders does not allow to transmit service traffics, it can transmit O&M pipe
Manage data.
6, armed state (Standby State): it is prohibited to transmit the state of the work PW of service traffics.It wherein, can work
Making PW, PE equipment is prohibited to transmit service traffics at one end, and other end PE equipment allows to transmit service traffics；Or, both ends PE is set
When standby Ei forbids transmitting service traffics, which is the PW that awaits orders.
7, PW preferentially forwards flag bit (referred to as can preferentially forward flag bit): in the PW status code that word length is 32 bits
In, defining the bit that bitmask is 0x00000020 is that PW preferentially forwards mark；Wherein, when which is set to second value (such as 1),
It indicates " this PW (in local terminal) is standby "；The bit is set to the first value (such as 0), indicates that " this PW (in local terminal), which is in, to live
Dynamic state ".
8, PW requests switching mark position (can referred to as request switching mark position): in the PW status code that word length is 32 bits
In, defining the bit that bitmask is 0x00000040 is PW request switching mark, which is set to second value (such as 1), indicates " this
PW request switches to active state "；The bit is set to the first value (such as 0), is indicated " this PW is without switching request ".
PW switchback process under independent manipulation mode in the prior art:
1, the PE equipment (being assumed to be PE1) for initiating the request of PW switchback issues LDP notice to far-end PE equipment (being assumed to be PE2)
Message, the LDP notification message include request be switched to active state main PW PWID (PW mark) and with second value (with
For 1) request switching mark position and preferential forwarding flag bit, at this point, the main PW is in local end PE equipment still in shape of awaiting orders
State, the movable PW in local end PE equipment are still remained unchanged；
2, when PE2 receives the LDP notification message of PE1 transmission, main PW is set to active state in local terminal (PE2), and to
Far-end PE (PE1) issues two LDP notification messages, including preferentially forwarding indicates in the LDP notification message of the mark of main PW
The value of position is the first value (for 0), and it is 1 that the value of flag bit is preferentially forwarded in the LDP notification message of the mark including standby PW；
3, when the PE equipment (PE1) of initiation PW switchback request receives the LDP notification message of far-end PE equipment (PE2) transmission,
Value including the preferential forwarding flag bit in the LDP notification message of the mark of main PW is 0, and therefore, PE1 determines switching request
The certainty for having obtained far-end PE equipment (PE2) is responded.PE1 carries out switchback, and main PW is set to active state in local terminal (PE1),
And two LDP notification messages are issued to far-end PE equipment (PE2), including preferential in the LDP notification message of the mark of main PW
The value for forwarding flag bit is 0, and it is 1 that the value of flag bit is preferentially forwarded in the LDP notification message of the mark including standby PW.
After completing the above PW switchback process, main PW switches to active state from original armed state, and standby PW is from original
Active state switches to armed state.
As it can be seen that needing repeatedly to interact LDP notification message in existing PW switchback process.
In order to keep the above objects, features, and advantages of the embodiment of the present invention more obvious and easy to understand, with reference to the accompanying drawing
Technical solution in the embodiment of the present invention is described in further detail.
It referring to Figure 1, is a kind of flow diagram of active and standby PW switching method provided in an embodiment of the present invention, such as Fig. 1 institute
Show, which may comprise steps of:
It should be noted that active and standby PW switching method provided in an embodiment of the present invention can be applied to PW1:1 redundancy protecting
(referred to herein as the first PE equipment, this two for the PE equipment in two PE equipment interconnected respectively by active and standby PW in networking
Another PE equipment in a PE equipment is known as the 2nd PE equipment).
In addition, in embodiments of the present invention, if non-specified otherwise, PW switchback mentioned in this article refers to independent manipulation mode
Under PW switchback.
Step 101, when the first PE equipment determine need to initiate PW switchback when, to the 2nd PE equipment send the first LDP notice
Message, the first LDP notification message include the mark of the first main PW and the preferential forwarding flag bit with the first value.
In the embodiment of the present invention, when the first PE equipment, which determines, needs to initiate PW switchback, for example, certain in the first PE equipment
When main PW fault recovery, to the 2nd PE equipment transmission LDP notification message, (referred to herein as the first LDP notice disappears the first PE equipment
Breath), the first LDP notification message include request be switched to active state main PW (the referred to herein as first main PW) mark with
And preferential forwarding flag bit (the i.e. value of the preferential forwarding flag bit of the first main PW in the first LDP notification message with the first value
For the first value).
In the embodiment of the present invention, when the preferential value for forwarding flag bit is the first value (such as 0), indicate " at this PW (in local terminal)
In active state "；When the value of preferential forwarding flag bit is second value (such as 1), indicate " this PW (in local terminal) is standby ".
It should be noted that in embodiments of the present invention, for the PE equipment at the active and standby both ends PW, when detecting main PW failure
When recovery, the initiator as PW switchback is determined whether according to preset strategy, for example, can be by comparing local end PE equipment and remote
The small PE equipment of IP address in the two is determined as the initiator of PW switchback by the IP address for holding PE equipment, and specific implementation is herein
It does not repeat them here.
In the embodiment of the present invention, when the 2nd PE equipment receives the first LDP notification message of the first PE equipment transmission, determine
Whether the first PW is the PW that can work.When the first main PW, which is, can work PW, the 2nd PE equipment marks the preferential forwarding of the first main PW
The value (value of the preferential forwarding flag bit of the first main PW recorded in the 2nd PE equipment) of will position is updated to the first value, and to first
The return of PE equipment includes the mark of the first main PW, and the value of preferential forwarding flag bit is (herein for the LDP notification message of the first value
Referred to as the 2nd LDP notification message).
Wherein, when the first PW, which is, can not work PW, the 2nd PE equipment ignores the first LDP notification message, not to this
One LDP notification message is responded.
Step 102, when receiving the 2nd LDP notification message of the 2nd PE equipment transmission, preferential by the first main PW turns
The value of hair flag bit is updated to the first value, and the 2nd LDP notification message includes the mark of the first main PW and with the excellent of the first value
First forward flag bit；Wherein, as the value of the preferential forwarding flag bit of the main PW in PE equipment and the corresponding standby PW of the main PW
When the value of preferential forwarding flag bit is first value, determine that the main PW is active state, standby PW is armed state.
It, can be with when the first PE equipment receives the 2nd LDP notification message of the 2nd PE equipment transmission in the embodiment of the present invention
Determine that PW switchback requests to have obtained the certainty response of the 2nd PE equipment, at this point, the first PE equipment can be by the excellent of the first main PW
First the value (value of the preferential forwarding flag bit of the first main PW recorded in the first PE equipment) of flag bit is forwarded to be updated to the first value.
It should be noted that the preferential of the first main PW turns in the first PE equipment when due to initiating switchback for the first main PW
The value for sending out flag bit is second value, therefore, main by first when the certainty that the first PE equipment receives the 2nd PE equipment is responded
The value of the preferential forwarding flag bit of PW is updated to the first value by second value.
In the embodiment of the present invention, for any PE equipment (such as above-mentioned first PE equipment in the PE equipment at the active and standby both ends PW
Or the 2nd PE equipment), it is excellent as the value of the preferential forwarding flag bit of the main PW in the PE equipment and the corresponding standby PW of the main PW
When first the value of flag bit being forwarded to be the first value, which can determine that main PW is active state, and standby PW is armed state.
As it can be seen that in method flow shown in Fig. 1, by the way that the priority of main PW is set above the corresponding standby PW of main PW,
I.e. when the value of the preferential forwarding flag bit of the main PW in PE equipment and the value of the preferential forwarding flag bit of the corresponding standby PW of main PW
When being the first value, which determines that main PW is active state, and standby PW is armed state, in turn, when needing to carry out PW switchback
When, the PE equipment for initiating PW switchback can notify far-end PE equipment by the preferential forwarding flag bit of main PW by LDP notification message
Value be updated to the first value, and when receiving far-end PE equipment and requesting to carry out the LDP notification message of certainty response to switchback,
The value of the preferential forwarding flag bit of the main PW of local terminal is updated to the first value, without passing through LDP message to the preferential of standby PW
The value of forwarding flag bit is updated, and is reduced the quantity of the LDP notification message of interaction in PW switchback process, is improved PW switchback
Efficiency.
Optionally, the present invention in one embodiment, it is above-mentioned to the 2nd PE equipment send the first LDP notification message it
Afterwards, can also include:
Start the timer that awaits a response；
Correspondingly, when receiving the 2nd LDP notification message of the 2nd PE equipment transmission, by the preferential forwarding of the first main PW
The value of flag bit is updated to the first value, may include:
Before the timer expiry that awaits a response, when receiving the 2nd LDP notification message of the 2nd PE equipment transmission, by the
The value of the preferential forwarding flag bit of one main PW is updated to the first value.
In this embodiment, it is contemplated that, may after the first PE equipment sends the first LDP notification message to the 2nd PE equipment
The 2nd PE equipment it can not receive the first LDP notification message due to Network Abnormal etc. and cause the 2nd PE equipment will not be to the
One PE equipment sends the 2nd LDP notification message, alternatively, the 2nd LDP notification message that the 2nd PE equipment is sent may also be due to net
The reasons such as network exception lead to not reach the first PE equipment, therefore, in order to avoid the first PE equipment is in always in the case of these
The state for the LDP notification message for waiting the 2nd PE equipment to send, improves the reasonability of PW switchback, and the first PE equipment is set to the 2nd PE
After preparation send the first LDP notification message, starting a timer, (referred to herein as await a response timer, timing length
Can be set according to actual scene, such as 3 seconds), the 2nd PE that the first PE equipment does not receive when awaiting a response timer expiry
When the 2nd LDP notification message that equipment is sent, determine that the 2nd PE equipment does not respond the first LDP notification message.
Correspondingly, in this embodiment, when the first PE equipment, which determines, needs to initiate PW switchback, the first PE equipment is to second
PE equipment sends the first LDP notification message, and starts the timer that awaits a response.
When the 2nd LDP notice that the first PE equipment receives the transmission of the 2nd PE equipment before the timer expiry that awaits a response disappears
When breath, the first PE equipment determines that switchback is requested to have obtained the certainty of the 2nd PE equipment and responded, at this point, the first PE equipment is by local terminal
The value of preferential forwarding flag bit of the first main PW the first value is updated to by second value.
Optionally, in one example, after above-mentioned starting awaits a response timer, can also include:
When awaiting a response timer expiry, when not receiving the 2nd LDP notification message of the 2nd PE equipment transmission, to
2nd PE equipment sends the 3rd LDP notification message, so that the 2nd PE equipment sets the value of the preferential forwarding flag bit of the first main PW
It is set to second value, the 3rd LDP notification message includes the mark of the first main PW and the preferential forwarding flag bit with second value.
In this example, when the first PE equipment does not receive the transmission of the 2nd PE equipment before the timer expiry that awaits a response
When the 2nd LDP notification message, the first PE equipment determine the first PE equipment do not allow carry out PW switchback, at this point, the first PE equipment to
2nd PE equipment sends the LDP notification message of the mark including the first main PW and the preferential forwarding flag bit with second value
(referred to herein as the 3rd LDP notification message), to notify the 2nd PE equipment to set armed state for the first main PW.
In this example, when the 2nd PE equipment receives the 3rd LDP notification message of the first PE equipment transmission, if local terminal
The value of the preferential forwarding flag bit of (the 2nd PE equipment) first main PW is the first value, then the 2nd PE equipment is updated to second
Value；If the value of the preferential forwarding flag bit of the main PW of local terminal first is second value, the 2nd PE equipment keeps it for second value.
Optionally, in another example, after above-mentioned starting awaits a response timer, can also include:
After awaiting a response timer expiry, when receiving the 2nd LDP notification message of the 2nd PE equipment transmission, really
Whether fixed first main PW is the PW that can work；
When the first main PW, which is, can work PW, the first value is set by the value of the preferential forwarding flag bit of the first main PW；
The 4th LDP notification message is sent to the 2nd PE equipment, so that the 2nd PE equipment marks the preferential forwarding of the first main PW
The value of will position is set as the first value, and the 4th LDP notification message includes the mark of the first main PW and with the preferential of the first value
Forward flag bit.
In this example, when the first PE equipment receives the transmission of the 2nd PE equipment after awaiting a response timer expiry
When the 2nd LDP notification message, the first PE equipment is no longer using the 2nd LDP notification message as the response of the first LDP notification message
Message, but the LDP notification message that PW switchback is sent is initiated as the 2nd PE equipment.
At this point, the first PE equipment determines whether the first main PW is the PW that can work, and when the first main PW, which is, can work PW, the
The value of the preferential forwarding flag bit of the first main PW in local terminal (the first PE equipment) is set the first value by one PE equipment, and to
Two PE equipment send LDP notification message (this of the mark including the first main PW and the preferential forwarding flag bit with the first value
Become the 4th LDP notification message in text).
In this example, when the 2nd PE equipment receives the 4th LDP notification message of the first PE equipment transmission, if second
The value of the preferential forwarding flag bit of the first main PW in PE equipment is the first value, then keeps it for the first value；If the 2nd PE equipment
On the first main PW preferential forwarding flag bit value be second value, then be updated to the first value.
Optionally, the present invention in one embodiment, above-mentioned PW switchback method can also include:
When receiving the 5th LDP notification message of the 2nd PE equipment transmission, determine whether the second main PW is the PW that can work；
5th LDP notification message includes the mark of the second main PW and the preferential forwarding flag bit with the first value；
When the second main PW, which is, can work PW, the first value is set by the value of the preferential forwarding flag bit of the second main PW；
The 6th LDP notification message is sent to the 2nd PE equipment, so that the 2nd PE equipment indicates the preferential forwarding of the 2nd PW
The value of position is set as the first value, and the 6th LDP notification message includes the mark of the second main PW and the preferential forwarding with the first value
Flag bit.
It should be noted that in embodiments of the present invention, the first main PW and the second main PW can be same main PW, can also be with
For different main PW.
In this embodiment, when the 2nd PE equipment initiates PW switchback, the 2nd PE equipment sends LDP to the first PE equipment and leads to
Know message (referred to herein as the 5th LDP notification message), includes that request is switched to active state in the 5th LDP notification message
The mark of main PW (the referred to herein as second main PW) and preferential forwarding flag bit with the first value.
When the first PE equipment receives the 5th LDP notification message of the 2nd PE equipment transmission, whether the second main PW is determined
For the PW that can work.When the second main PW, which is, can work PW, the 2nd PE equipment is by the second main PW's in local terminal (the first PE equipment)
The value of preferential forwarding flag bit is set as the first value, and returns to the mark including the second main PW to the 2nd PE equipment, and preferentially turn
The value for sending out flag bit is the LDP notification message (referred to herein as the 6th LDP notification message) of the first value.
It should be noted that in this embodiment, when the first PE equipment determines that the 2nd PW is that can not work PW, the first PE
Equipment ignores the 5th LDP notification message, does not respond to the 5th LDP notification message.
In this embodiment, when the 2nd PE equipment receives the 6th LDP notification message of the first PE equipment transmission, second
PE equipment determines that PW switchback is requested to have obtained the certainty of the first PE equipment and responded, at this point, the 2nd PE equipment is by local terminal (the 2nd PE
Equipment) on the value of preferential forwarding flag bit of the second main PW be set as the first value.
It should be noted that in this embodiment, when the 2nd PE equipment initiates PW switchback, the 2nd PE equipment is to the first PE
After equipment sends the 5th LDP notification message, the timer that awaits a response also can star, specific implementation may refer to above-mentioned the
One PE equipment initiates associated description when PW switchback, and this will not be repeated here for the embodiment of the present invention.
In order to make those skilled in the art more fully understand technical solution provided in an embodiment of the present invention, below with reference to specific
Application scenarios are illustrated technical solution provided in an embodiment of the present invention.
Fig. 2 is referred to, is a kind of configuration diagram of concrete application scene provided in an embodiment of the present invention, as shown in Fig. 2,
In the application scenarios, the PW between PE1 and PE2 forms 1:1 redundancy protecting, and (PE1 is the first PE in above method embodiment
Equipment, PE2 is the 2nd PE equipment in above method embodiment, alternatively, PE1 sets for the 2nd PE in above method embodiment
Standby, PE2 is the first PE equipment in above method embodiment), wherein between PE1 and P1 (intermediate equipment 1) and P1 and PE2
PW be main PW；PW between PE1 and P2 (intermediate equipment 2) and P2 and PE2 is standby PW, customer network edge (English:
Customer Edge, referred to as: CE) for equipment 1 by PE1 access public network, CE2 accesses public network by PE2.
Fig. 3 is referred to, is PE (PE1 or PE2) reference model schematic diagram in the networking of PW1:1 redundancy protecting, such as Fig. 3 institute
Show, for one group of PW redundancy protecting, an only PW is in active state in the PE equipment of both ends, and another PW, which is in, to await orders
State.And the precedence designation position of possible main PW and standby PW are the first value (for 0) in PE equipment, in this case,
PE equipment wherein must will be determined as active state by a PW, and another PW is then armed state.
Correspondingly, in this embodiment it is possible to set a rule for PW transponder: main PW priority is higher than standby PW.I.e.
When the value of the preferential forwarding flag bit of PW main in PE equipment and standby PW is 0, main PW is determined as active state by PE equipment, will
Standby PW is determined as armed state.
Based on the rule, PW switchback scheme implementation process is as follows in application scenarios shown in Fig. 2:
Initiate the PE equipment (by taking PE1 as an example) of PW switchback request:
1, PE1 sends LDP notification message a to PE2, and LDP notification message a includes the main PW that request switches to active state
The preferential forwarding flag bit that the mark (being assumed to be PWID1) and value of (assuming that being main PW1) are 0, main PW1 still locates in PE1 at this time
In armed state, PW (the corresponding standby PW of such as main PW1, it is assumed that still remain unchanged for standby PW1) of current activity state；
2, start the timer that awaits a response, timing length is 3 seconds；
3, that receive PE2 transmission (in i.e. 3 seconds) before the timer expiry that awaits a response as PE1 includes PWID1, and value is
When the LDP notification message b of 0 preferential forwarding flag bit, PE1 determines that PW switchback has obtained the certainty response of PE2, at this point, PE1
Stop the timer that awaits a response, and the value of the preferential forwarding flag bit of the main PW1 of local terminal is updated to by second value (for 1)
0；
4, when PE1 do not received before the timer expiry that awaits a response PE2 transmission include PWID1, and be worth for 0 it is preferential
When forwarding the LDP notification message b of flag bit, PE1 determines that PW switchback does not obtain the certainty response of PE2, at this point, PE1 executes PW
Switchback cancels process, that is, stops the timer that awaits a response, and sending to PE2 includes PWID1, and being worth is second value (for 1)
Preferential forwarding flag bit LDP notification message c, when so that PE2 receiving LDP notification message c, by the preferential forwarding of main PW1
The value of flag bit is set as 1, and (if receive LDP notification message c, the value of the preferential forwarding flag bit of the main PW1 on PE2 is 1, then
Keep the value constant)；
5, that receive PE2 transmission (after i.e. 3 seconds) after awaiting a response timer expiry as PE1 includes PWID1, and value is
When the LDP notification message b of 0 preferential forwarding flag bit, PE1 determines that PE2 initiates to request for the switchback of main PW1, at this point, PE1
Determine whether main PW1 is the PW that can work, if so, the value of the preferential forwarding flag bit of PW1 main on PE1 is updated to 0, and to
It includes PWID1 that PE2, which is sent, and is worth the LDP notification message d of the preferential forwarding flag bit for 0；Otherwise, ignore LDP notification message b.
Receive the PE equipment (by taking PE2 as an example) of PW switchback request:
1, when PE2 receives the LDP notification message of the preferential forwarding flag bit for being 0 including PWID1 and value of PE1 transmission
(when such as above-mentioned LDP notification message a), PE2 determines whether main PW1 is can work PW (at this point, standby PW1 is active state on PE2)；
If 2, main PW1 is that can work PW, the value of the preferential forwarding flag bit of PW1 main on PE2 is updated to 0, and to PE1
Sending includes PWID1, and is worth LDP notification message (such as above-mentioned LDP notification message b) of the preferential forwarding flag bit for 0；
If 3, main PW1 is the PW that can not work, ignore LDP notification message a.
Through above description as can be seen that in technical solution provided in an embodiment of the present invention, by by the preferential of main PW
Grade is set above the corresponding standby PW of main PW, i.e., when the value of the preferential forwarding flag bit of the main PW in PE equipment and main PW are corresponding
The value of preferential forwarding flag bit of standby PW when being the first value, which determines that main PW is active state, and standby PW is to await orders
State, in turn, when needing to carry out PW switchback, the PE equipment for initiating PW switchback can notify far-end PE by LDP notification message
The value of the preferential forwarding flag bit of main PW is updated to the first value by equipment, and requests to carry out to switchback receiving far-end PE equipment
When the LDP notification message that certainty is responded, the value of the preferential forwarding flag bit of the main PW of local terminal is updated to the first value, without
It to be updated by value of the LDP message to the preferential forwarding flag bit of standby PW, the LDP for reducing interaction in PW switchback process is logical
The quantity for knowing message improves the efficiency of PW switchback.
Fig. 4 is referred to, provides a kind of structural schematic diagram of PW switchback device for the embodiment of the present invention, wherein the device can
With the first PE equipment being applied in above method embodiment, as shown in figure 4, the PW switchback device may include:
Transmission unit 410, for when determination needs to initiate PW switchback, the 2nd PE equipment of Xiang Suoshu to send the first label point
Agreement LDP notification message is sent out, the first LDP notification message includes the mark of the first main PW and preferentially turns with the first value
Send out flag bit；
Receiving unit 420, the LDP notification message sent for receiving the 2nd PE equipment；
Switch unit 430, for leading to when the receiving unit 420 receives the 2nd LDP that the 2nd PE equipment is sent
When knowing message, the value of the preferential forwarding flag bit of the described first main PW is updated to first value, the 2nd LDP notice disappears
Mark of the breath including the described first main PW and the preferential forwarding flag bit with first value；
Wherein, when the value of the preferential forwarding flag bit of the main PW in PE equipment and the preferential of the corresponding standby PW of the main PW turn
When the value of hair flag bit is first value, determine that the main PW is active state, standby PW is armed state.
It is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention, such as Fig. 5 please also refer to Fig. 5
Shown, on the basis of PW switchback device shown in Fig. 4, the device of PW switchback shown in Fig. 5 can also include:
Start unit 440, for starting the timer that awaits a response；
The switch unit 430, specifically for working as the receiving unit 420 before the timer expiry that awaits a response,
When receiving the 2nd LDP notification message that the 2nd PE equipment is sent, the preferential forwarding of the described first main PW is indicated
The value of position is updated to first value.
In an alternative embodiment, the transmission unit 410 is also used to await a response when the receiving unit 420 described
When timer expiry, when not receiving the 2nd LDP notification message that the 2nd PE equipment is sent, the 2nd PE of Xiang Suoshu is set
Preparation send the 3rd LDP notification message, so that the 2nd PE equipment sets the value of the preferential forwarding flag bit of the described first main PW
It is set to second value, the 3rd LDP notification message includes the mark of the described first main PW and with the preferential of the second value
Forward flag bit.
It is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention, such as Fig. 6 please also refer to Fig. 6
Shown, on the basis of PW switchback device shown in Fig. 5, the device of PW switchback shown in Fig. 6 can also include:
First determination unit 450, for when the receiving unit 420 it is described await a response timer expiry after, connect
When receiving the 2nd LDP notification message that the 2nd PE equipment is sent, determine whether the described first main PW is the PW that can work；
The switch unit 430 is also used to when the described first main PW, which is, can work PW, by the preferential of the described first main PW
The value of forwarding flag bit is set as first value；
The transmission unit 410 is also used to send the 4th LDP notification message to the 2nd PE equipment, so that described the
The value of the preferential forwarding flag bit of the described first main PW is set the first value, the 4th LDP notification message packet by two PE equipment
Include the mark of the described first main PW and the preferential forwarding flag bit with first value.
It is the structural schematic diagram of another kind PW switchback device provided in an embodiment of the present invention, such as Fig. 7 please also refer to Fig. 7
Shown, on the basis of PW switchback device shown in Fig. 4, the device of PW switchback shown in Fig. 7 can also include:
Second determination unit 460, for receiving the 5th that the 2nd PE equipment is sent when the receiving unit 420
When LDP notification message, determine whether the described second main PW is the PW that can work；The 5th LDP notification message includes described second
The mark of main PW and preferential forwarding flag bit with first value；
The switch unit 430 is also used to when the described second main PW, which is, can work PW, by the preferential of the described second main PW
The value of forwarding flag bit is set as first value；
The transmission unit 410 is also used to send the 6th LDP notification message to the 2nd PE equipment, so that described the
The value of the preferential forwarding flag bit of the 2nd PW is set first value, the 6th LDP notification message by two PE equipment
Mark including the described second main PW and the preferential forwarding flag bit with first value.
Fig. 8 is referred to, is a kind of hardware structural diagram of PW switchback device provided in an embodiment of the present invention.The PW switchback
Device may include processor 801, the machine readable storage medium 802 for being stored with machine-executable instruction.Processor 801 and machine
Device readable storage medium storing program for executing 802 can be communicated via system bus 803.Also, by reading and executing machine readable storage medium 802
In machine-executable instruction corresponding with PW switchback logic, above-described PW switchback method can be performed in processor 801.
Machine readable storage medium 802 referred to herein can be any electronics, magnetism, optics or other physical stores
Device may include or store information, such as executable instruction, data, etc..For example, machine readable storage medium can be easily
Lose memory, nonvolatile memory or similar storage medium.Specifically, machine readable storage medium 802 can be RAM
(Radom Access Memory, random access memory), flash memory, memory driver (such as hard disk drive), solid state hard disk,
Any kind of storage dish (such as CD, DVD) perhaps similar storage medium or their combination.
The embodiment of the invention also provides a kind of machine readable storage mediums including machine-executable instruction, such as Fig. 8
In machine readable storage medium 802, the machine-executable instruction can by the processor 801 in PW switchback device execute with reality
Existing PW switchback method described above.
The function of each unit and the realization process of effect are specifically detailed in the above method and correspond to step in above-mentioned apparatus
Realization process, details are not described herein.
For device embodiment, since it corresponds essentially to embodiment of the method, so related place is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
The purpose for needing to select some or all of the modules therein to realize the present invention program.Those of ordinary skill in the art are not paying
Out in the case where creative work, it can understand and implement.
As seen from the above-described embodiment, by the way that the priority of main PW is set above the corresponding standby PW of main PW, i.e., when PE is set
The value of the preferential forwarding flag bit of the value and corresponding standby PW of main PW of the preferential forwarding flag bit of standby upper main PW is first
When value, which determines that main PW is active state, and standby PW is armed state, in turn, when needing to carry out PW switchback, initiates PW
The PE equipment of switchback can notify far-end PE equipment to update the value of the preferential forwarding flag bit of main PW by LDP notification message
For the first value, and when receiving far-end PE equipment and requesting to carry out the LDP notification message of certainty response to switchback, by local terminal
The value of the preferential forwarding flag bit of main PW is updated to the first value, without being indicated by LDP message to the preferential forwarding of standby PW
The value of position is updated, and is reduced the quantity of the LDP notification message of interaction in PW switchback process, is improved the efficiency of PW switchback.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of pseudo-wire switchback method, applied to the first service provider network edge in pseudo-wire PW1:1 redundancy protecting networking
PE equipment, the first PE equipment are connect by active and standby PW with the 2nd PE equipment respectively, which is characterized in that the described method includes:
When the first PE equipment, which determines, needs to initiate PW switchback, the 2nd PE equipment of Xiang Suoshu sends the first tag distribution protocol
LDP notification message, the first LDP notification message include the mark of the first main PW and the preferential forwarding mark with the first value
Position；
When receiving the 2nd LDP notification message that the 2nd PE equipment is sent, the preferential forwarding of the described first main PW is marked
The value of will position is updated to first value, and the 2nd LDP notification message includes the mark of the described first main PW and has an institute
State the preferential forwarding flag bit of the first value；
Wherein, when the preferential forwarding of the value of the preferential forwarding flag bit of the main PW in PE equipment and the corresponding standby PW of the main PW are marked
When the value of will position is first value, determine that the main PW is active state, standby PW is armed state.
2. the method according to claim 1, wherein described send the first LDP notice to the 2nd PE equipment
After message, further includes:
Start the timer that awaits a response；
It is described when receiving the 2nd LDP notification message that the 2nd PE equipment is sent, preferential by the described first main PW turns
The value of hair flag bit is set as first value, comprising:
Before the timer expiry that awaits a response, receives the 2nd LDP notice that the 2nd PE equipment is sent and disappear
When breath, the value of the preferential forwarding flag bit of the described first main PW is updated to first value.
3. according to the method described in claim 2, it is characterized in that, the starting awaits a response after timer, further includes:
When it is described await a response timer expiry when, do not receive the 2nd LDP notice that the 2nd PE equipment is sent
When message, the 2nd PE equipment of Xiang Suoshu sends the 3rd LDP notification message, so that the 2nd PE equipment is by the described first main PW's
The value of preferential forwarding flag bit is set as second value, the 3rd LDP notification message include the described first main PW mark and
Preferential forwarding flag bit with the second value.
4. according to the method described in claim 2, it is characterized in that, the starting awaits a response after timer, further includes:
When it is described await a response timer expiry after, receive the 2nd LDP notice that the 2nd PE equipment is sent
When message, determine whether the described first main PW is the PW that can work；
When the described first main PW, which is, can work PW, described the is set by the value of the preferential forwarding flag bit of the described first main PW
One value；
The 4th LDP notification message is sent to the 2nd PE equipment, so that the 2nd PE equipment is by the excellent of the described first main PW
First the value of flag bit is forwarded to be set as the first value, the 4th LDP notification message includes the mark and tool of the described first main PW
There is the preferential forwarding flag bit of first value.
5. the method according to claim 1, wherein the method also includes:
When receiving the 5th LDP notification message that the 2nd PE equipment is sent, determine the described second main PW whether be can work
Make PW；The 5th LDP notification message includes the mark of the described second main PW and the preferential forwarding mark with first value
Will position；
When the described second main PW, which is, can work PW, described the is set by the value of the preferential forwarding flag bit of the described second main PW
One value；
The 6th LDP notification message is sent to the 2nd PE equipment, so that the 2nd PE equipment is by the preferential of the 2nd PW
The value of forwarding flag bit is set as first value, the 6th LDP notification message include the described second main PW mark and
Preferential forwarding flag bit with first value.
6. a kind of pseudo-wire switchback device, applied to the first service provider network edge in pseudo-wire PW1:1 redundancy protecting networking
PE equipment, the first PE equipment are connect by active and standby PW with the 2nd PE equipment respectively, which is characterized in that described device includes:
Transmission unit, for when determination needs to initiate PW switchback, the 2nd PE equipment of Xiang Suoshu to send the first tag distribution protocol
LDP notification message, the first LDP notification message include the mark of the first main PW and the preferential forwarding mark with the first value
Position；
Receiving unit, the LDP notification message sent for receiving the 2nd PE equipment；
Switch unit will when for receiving the 2nd LDP notification message of the 2nd PE equipment transmission when the receiving unit
The value of the preferential forwarding flag bit of the first main PW is updated to first value, and the 2nd LDP notification message includes described
The mark of first main PW and preferential forwarding flag bit with first value；
Wherein, when the preferential forwarding of the value of the preferential forwarding flag bit of the main PW in PE equipment and the corresponding standby PW of the main PW are marked
When the value of will position is first value, determine that the main PW is active state, standby PW is armed state.
7. device according to claim 6, which is characterized in that described device further include:
Start unit, for starting the timer that awaits a response；
The switch unit receives described specifically for working as the receiving unit before the timer expiry that awaits a response
When the 2nd LDP notification message that the 2nd PE equipment is sent, the value of the preferential forwarding flag bit of the described first main PW is updated
For first value.
8. device according to claim 7, which is characterized in that
The transmission unit, be also used to when the receiving unit it is described await a response timer expiry when, do not receive described
When the 2nd LDP notification message that the 2nd PE equipment is sent, the 2nd PE equipment of Xiang Suoshu sends the 3rd LDP notification message, with
The 2nd PE equipment is set to set second value for the value of the preferential forwarding flag bit of the described first main PW, the 3rd LDP is logical
Know that message includes the mark of the described first main PW and the preferential forwarding flag bit with the second value.
9. device according to claim 7, which is characterized in that described device further include:
First determination unit, for when the receiving unit it is described await a response timer expiry after, receive described
When the 2nd LDP notification message that two PE equipment are sent, determine whether the described first main PW is the PW that can work；
The switch unit is also used to mark the preferential forwarding of the described first main PW when the described first main PW, which is, can work PW
The value of will position is set as first value；
The transmission unit is also used to send the 4th LDP notification message to the 2nd PE equipment, so that the 2nd PE equipment
The first value is set by the value of the preferential forwarding flag bit of the described first main PW, the 4th LDP notification message includes described
The mark of one main PW and preferential forwarding flag bit with first value.
10. device according to claim 6, which is characterized in that described device further include:
Second determination unit, for receiving the 5th LDP notification message that the 2nd PE equipment is sent when the receiving unit
When, determine whether the described second main PW is the PW that can work；The 5th LDP notification message include the mark of the described second main PW with
And the preferential forwarding flag bit with first value；
The switch unit is also used to mark the preferential forwarding of the described second main PW when the described second main PW, which is, can work PW
The value of will position is set as first value；
The transmission unit is also used to send the 6th LDP notification message to the 2nd PE equipment, so that the 2nd PE equipment
First value is set by the value of the preferential forwarding flag bit of the 2nd PW, the 6th LDP notification message includes described
The mark of second main PW and preferential forwarding flag bit with first value.
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