CN104506433B - A kind of method and apparatus that PTP messages are identified in MPLS network - Google Patents
A kind of method and apparatus that PTP messages are identified in MPLS network Download PDFInfo
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- CN104506433B CN104506433B CN201410842019.0A CN201410842019A CN104506433B CN 104506433 B CN104506433 B CN 104506433B CN 201410842019 A CN201410842019 A CN 201410842019A CN 104506433 B CN104506433 B CN 104506433B
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Abstract
Present invention is disclosed the method and apparatus that PTP messages are identified in a kind of MPLS network, it will be by that will enter difference of the message in MPLS network according to PTP messages and non-PTP messages, when entering direction edge label switch router encapsulated message, different ethernet type fields is filled respectively in reserved too net type field, in Label Switch Router during analytic message, PTP messages are identified by ethernet type field, its timestamp and time-domain offset information are obtained to PTP messages, and renewal time domain information, it obtains to forward the packet to outgoing direction edge label switch router after MPLS forwarding informations simultaneously and carries out decapsulation processing.The present invention does not need to change the label stack that MPLS forwardings rely on, and does not change the label number and structure of MPLS, simplifies the network deployment of PTP in MPLS network, also improves the identifying processing speed of PTP messages in an mpls network.
Description
Technical field
The present invention relates to network communication fields more particularly to one kind to realize that PTP messages are known in an mpls network based on hardware
Method for distinguishing and device.
Background technology
With the development of mobile data services, the synchronous requirement of time is also constantly being improved in mobile base station, traditional net
In network, the time synchronization between mobile base station carries out the time synchronization of base station using GPS, however, GPS is synchronized, there is installations to tie up
Protect of high cost, installation environment requirement is high and the problem of national telecommunication network security factor etc., then PTP (Precision
Time Protocol, accurate clock synchronization protocol) become the alternative solution of GPS.PTP is the one kind defined by IEEE1588
The agreement of precise synchronization, compared with traditional Service of Timing, PTP has apparent advantage, uses two-way channel, precision
It it is ns grades, expense is low, adapts to different access environment etc., and under the industry background for constantly requiring precision to improve, PTP has become
For a kind of inexorable trend of development.
PTP uses the synchronization mechanism of principal and subordinate, and in order to improve synchronization accuracy, PTP does not require nothing more than main equipment and slave device identification
With processing PTP messages, the processing of timestamp is carried out, the equipment between master-slave equipment also identifies PTP messages, and carry out time-domain
Update.In mobile retransmission net, MPLS-TP is one of mainstream technology for connecting master-slave equipment, and IEEE1588 is not promising
The corresponding encapsulation format of MPLS network application definition PTP messages, then how in MPLS (Multi-Protocol Label
Switching, multiprotocol label switching) carry out PTP messages in network be treated as a problem to be solved.
At present, IETF is a kind of based on MPLS nets in draft-davari-tictoc-1588overmpls-01.txt definition
The PTP identifying schemes of network solve the problems, such as the identification of PTP messages in MPLS network using PTP label switched paths (LSP).
An independent label switched path, referred to as Timing LSP, so as to make the forwarding of PTP and data are created between master-slave equipment
Forwarding is completed independently, and MPLS equipment identifies PTP messages by the message that Timing LSP are transmitted.Although the above method solves
To the identification problem of PTP messages in MPLS equipment, but its there are following limitations：
1) label stack of the identification of message dependent on MPLS messages is unfavorable for network chip identification PTP messages at the first time.
2) all edge devices will establish Timing LSP with main equipment, with the increase of edge device, safeguard more
More Timing LSP, autgmentability are poor.
In addition, application No. is 200810184520.7, the method, apparatus of entitled identification precision time protocol massages and
In the Chinese patent of system, a kind of method and apparatus for identifying PTP messages are also revealed, by after Tunnel LSP labels
Specific label is inserted into identify PTP messages.Its message format is as follows：
| Tunnel Label, Reverse Label, PW Label | DW | DA, SA, EtherType domain, 1588PTP Payload |
It is disclosed in the patent and identifies the method for PTP messages by changing the label stack of message, solve above-mentioned technology
Middle Timing LSP numbers and the associated problem of edge device number, so its also there are limitations to be：1) identification of message according to
Rely in the label stack of MPLS messages, be unfavorable for network chip identification PTP messages at the first time；2) while the label of MPLS is increased
Number, if there is multilayer labels, such as LSP over LSP, it is necessary to multiple Reverse Label are added in label stack, increase
Add the forwarding difficulty of the network equipment.
Invention content
The purpose of the present invention is to provide the method and apparatus that PTP messages are identified in a kind of MPLS network, by reporting
Different ethernet type fields is filled to PTP messages and non-PTP messages in the ethernet type domain of literary two layers of head of Ethernet, it is real
Identification and processing in existing MPLS network to PTP messages forward relied on label stack without changing MPLS, also do not change
The label number and structure of MPLS so as to simplify the network deployment of identification PTP messages in MPLS network, is improved and is known in MPLS network
The speed of other PTP messages.
To achieve the above object, the following technical solutions are proposed by the present invention：The side of PTP messages is identified in a kind of MPLS network
Method, including：
S1, encapsulation enter the message in MPLS network, identify PTP messages and non-PTP messages, and according to PTP messages and
The difference of non-PTP messages, when adding two layers of head of packet outer layer Ethernet, with different ethernet type field filling messages
Ethernet type domain；
S2, dissection process is carried out to message, including identifying PTP messages, obtains the timestamp of the message, and carry out PTP
The update processing of time-domain, while forwarded the packet after obtaining the MPLS forwarding informations of message；For non-PTP messages, directly obtain
It is forwarded after taking MPLS forwarding informations；
S3, decapsulation message, and to PTP messages, obtain the MPLS of completion message after the timestamp and forwarding information of message
Forwarding；For non-PTP messages, the MPLS that message is directly completed according to forwarding information is forwarded.
More preferably, in the S1, the tag processes that MPLS is carried out to message are further included, complete the label needed for MPLS forwardings
Editor acts.
More preferably, in the S1, for PTP messages, the ethernet type domain of message is a reserved ethernet type,
For non-PTP messages, the ethernet type domain of message uses standard MPLS types.
More preferably, the ethernet type field of the PTP messages be 0xPTPType, the ethernet type word of non-PTP messages
Section is 0x8847.
More preferably, in the S2, including：
The PTP messages identified according to the ethernet type field of message；
Obtain the entry time stamp of message and MPLS forwarding informations；
PTP messages are parsed, to obtain the offset information of the type information of PTP messages and time-domain；
The time-domain of PTP messages is updated according to the time-domain offset information of PTP messages, and is carried out according to MPLS forwarding informations
Forwarding.
More preferably, the forwarding information of the MPLS obtains by searching for MPLS forwarding tables.
Present invention further teaches in a kind of MPLS network identify PTP messages device, including：
Enter direction edge label switch router LER, for encapsulating the message into MPLS network, identify whether as PTP
Message, and according to the difference of PTP messages and non-PTP messages, when adding outer layer two layers of head of Ethernet for message, with it is different with
The too ethernet type domain of net type field filling message；
Label Switch Router LSR identifies PTP messages for passing through ethernet type domain, obtains message entrance
Timestamp, and the update processing of PTP time-domains is carried out, while forward the packet according to the MPLS forwarding informations of message；For non-
PTP messages are forwarded after directly acquiring MPLS forwarding informations；
Outgoing direction edge label switch router LER for decapsulating message, and to PTP messages, obtains the time of message
The MPLS forwardings of message are completed after stamp and forwarding information；For non-PTP messages, the MPLS of message is directly completed according to forwarding information
Forwarding.
More preferably, the Label Switch Router LSR includes：
Network chip enters direction processing module, for identifying PTP messages, obtains the timestamp of message and MPLS forwarding informations
Afterwards, it forwards the packet to PTP message processing module (MPM)s；
PTP message processing module (MPM)s for carrying out dissection process to PTP messages, obtain the type information and time-domain of message
It is forwarded the packet after offset information to chip outgoing direction processing module；
Network chip outgoing direction processing module for the time-domain offset information renewal time domain according to PTP messages, and obtains
It is forwarded after taking message MPLS forwarding informations.
More preferably, for non-PTP messages, then the MPLS forwarding letters of message are obtained in network chip enters direction processing module
After breath, it is forwarded to network chip outgoing direction processing module, and after carrying out MPLS decapsulations by network chip outgoing direction processing module
It E-Packets.
Compared with prior art, the method and apparatus that the present invention identifies PTP messages in an mpls network, using in message
Ethernet type domain be identified, be based on hard-wired, the identification of PTP messages settled at one go, i.e., PTP messages are known
After not obtaining the information such as timestamp afterwards, MPLS forwardings are carried out behind direct renewal time domain.The present invention does not need to change MPLS forwardings
The label stack of dependence does not change the label number and structure of MPLS, simultaneously, it is not required that is provided for PTP messages reservation label and LSP
Source not only simplifies the network deployment of PTP in MPLS network, also improves the identifying processing speed of PTP messages in an mpls network
Degree.
Description of the drawings
Fig. 1 is the network topology schematic diagram that PTP messages are identified in MPLS network of the present invention；
Fig. 2 is the flow chart that PTP messages are identified in MPLS network of the present invention；
Fig. 3 is the module map that PTP messages are identified in MPLS network of the present invention.
Specific embodiment
Below in conjunction with the attached drawing of the present invention, clear, complete whole description is carried out to the technical solution of the embodiment of the present invention.
As shown in Figure 1, Figure 2, the method for PTP messages is identified in the MPLS network that the present invention discloses, by that will enter
Message in MPLS network adds in different according to the difference of PTP messages and non-PTP messages in the ethernet type domain of message
Identification field, and then the too net type field in message identifies PTP messages and non-PTP messages, and to PTP messages on side
Edge Label Switch Router LER (Label Edge Router) and Label Switch Router LSR (Label Swtiched
Router be packaged, parse in), decapsulate after and the processing that is forwarded, specifically include：
S1, encapsulation enter the message in the edge label switch router LER of direction, and road is exchanged by entering direction edge label
PTP messages and non-PTP messages are identified, and carry out MPLS label processing by device LER.Specifically, enter direction edge label to hand over
Router LER is changed using the message characteristic that IEEE1588 is defined to identify PTP messages：If PTP is encapsulated by UDP, UDP
Destination slogan is 319 or 320；If PTP is encapsulated by Ethernet, ethernet type thresholding is 0x88F7.
Since the direction of incoming port for entering direction edge label switch router LER has criterion of identification IEEE1588 standards
Therefore the ability of PTP messages, after message enters the inbound port, just can recognize that whether be PTP messages；Then to message
Be normally carried out the tag processes of MPLS, acted with completing the label editing needed for MPLS forwardings.
S2 enters direction edge label switch router LER and adds outer layer two layers of head of Ethernet for message, according to PTP messages
With the difference of non-PTP messages, different ethernet type fields is filled in ethernet type domain to show difference.
When filling the ethernet type domain in message two layers of head of Ethernet, if PTP messages, then it is based on using one
PTP (PTP over MPLS) message form of MPLS network is filled, and the ethernet type of the PTP based on MPLS network is
One reserved ethernet type, as represented in the present embodiment using 0xPTPType；If being non-PTP messages, standard is used
MPLS type 0x8847 represent.In this way, by filling different ethernet type fields in ethernet type domain, by PTP
Message and non-PTP messages are distinguished, wherein, the form for filling the PTP messages after ethernet type field is：
The form of non-PTP messages after filling ethernet type field is：
S3, in Label Switch Router LSR, identified by ethernet type domain the PTP messages that are encapsulated by MPLS and
Non- PTP messages.The PTP Message processing processes of MPLS encapsulation are as follows：
1) chip records the timestamp that the PTP messages enter chip.
2) forwarding lookup of MPLS is carried out, obtains the Tag switching forwarding information of this message.
3) PTP message processing module (MPM)s skip MPLS heads, and the ending of MPLS is identified by the stack bottom label of MPLS, is obtained
Meet the UDP of IEEE1588 standards or the PTP messages of Ethernet encapsulation, carry out time-domain processing as defined in IEEE1588, pass through
After the processing of PTP message processing module (MPM)s, this message has been completed the update operation of time-domain.
4) the MPLS forwarding informations obtained according to step 2) carry out Tag switching forwarding.
For non-PTP messages, then the forwarding that normal MPLS is directly carried out after the MPLS information of message is obtained.
Specifically, for PTP messages, enter direction processing mould in the network chip of Tag switching device router LSR first
In block, PTP messages are identified according to the field in ethernet type domain, and obtain the timestamp of message entrance, carry out MPLS forwardings
The lookup of table obtains the forwarding information of MPLS, and PTP messages are forwarded in PTP message processing module (MPM)s.
In the PTP message processing module (MPM)s of Label Switch Router LSR, deep analysis PTP messages obtain PTP messages
Type information, offset information of the time-domain in MPLS messages of PTP messages, PTP time-domains processing action.
In the network chip outgoing direction processing module of Label Switch Router LSR, according to the offset of PTP time-domains, PTP
The information of time-domain processing action, carries out the update of time-domain, meanwhile, according to the forwarding information of MPLS, carry out normal MPLS
Forwarding, message is sent in the edge label switch router LER of outgoing direction.
For non-PTP messages, then after directly acquiring its MPLS forwarding information, from the network core of Label Switch Router LSR
Piece enters direction processing module and is forwarded in network chip outgoing direction processing module.
S4, the edge label switch router LER of outgoing direction identify PTP messages, recognition methods and tag changeable path
Essentially identical by the recognition methods in device LSR, difference is that forwarding information is not Tag switching, is the decapsulation of MPLS.For PTP
Message obtains the timestamp of message entrance, and passes through the decapsulation of MPLS, obtains the forwarding information of PTP messages, is believed according to forwarding
Breath completes the forwarding of message, and for non-PTP messages, the forwarding of message is directly completed according to forwarding information.
Specifically, message enters after outgoing direction edge label switch router LER and the processing of message is included：
PTP messages and non-PTP messages are identified by ethernet type domain, obtaining message for PTP messages enters the road
By the timestamp of device；
The lookup of MPLS forwarding tables is carried out, the decapsulation of MPLS is carried out, obtains the IEEE1588PTP messages of standard；
The lookup of table is forwarded to the PTP messages of decapsulation, obtains the forwarding information of message；
The forwarding of message is completed according to forwarding information；
For the IEEE1588PTP messages of standard, by the process flow of PTP messages, the fresh information of time-domain is obtained.
Present invention further teaches the device for identifying PTP messages in an mpls network, the identification device is included into direction side
Edge Label Switch Router LER, Label Switch Router LSR and outgoing direction label edge router LER, for entering
PTP messages in MPLS network update PTP messages its time domain information by the identification in the Switch Router, and
Forwarded in MPLS, to other non-PTP messages, be directly normally carried out the forwarding of MPLS.
Further, it is described enter direction edge label switch router LER for encapsulate enter MPLS network in report
Text identifies PTP messages and non-PTP messages, and when adding outer layer two layers of head of Ethernet for message, the basis in ethernet type domain
The difference of PTP messages and non-PTP type of messages adds different ethernet type fields respectively；As in the present embodiment for
PTP messages are represented in ethernet type domain using 0xPTPType；If be non-PTP messages, the MPLS of standard is used
Type 0x8847 is represented.
The Label Switch Router LSR is identified from entering by the ethernet type domain of message for parsing PTP messages
Direction edge label switch router LER enter message whether be PTP messages, if PTP messages, then obtain the message into
The update of timestamp, progress PTP time-domains entered is handled, and carries out the MPLS forwardings of message；For non-PTP messages, then directly
Carry out the forwarding of normal MPLS.
The outgoing direction label edge router LER is used to decapsulate message and forward the message after decapsulation,
PTP messages are identified according to the ethernet type field of message, obtain the timestamp of message entrance, and pass through the deblocking of MPLS
Dress, obtains the forwarding information of PTP messages, and the forwarding of message is completed according to forwarding information, and for non-PTP messages, directly basis turns
Photos and sending messages complete the forwarding of message.
Wherein, the Label Switch Router LSR enters direction processing module, PTP message processing module (MPM)s including network chip
With network chip outgoing direction processing module.
Wherein described network chip enters ethernet type field of the direction processing module in message and identifies this
Whether message is PTP messages, for PTP messages, obtains message and enters the timestamp of the module and the MPLS forwarding informations of message
It is forwarded to PTP message processing module (MPM)s；For non-PTP messages, then the MPLS forwarding informations of message are directly acquired, and be forwarded to network
Chip outgoing direction processing module.
The PTP message processing module (MPM)s are used to carry out deep analysis to PTP messages, obtain type information, the time of message
The processing action of offset and PTP time-domain of the domain in MPLS.
The network chip outgoing direction processing module is used for the time domain information according to PTP messages, updates the time of PTP
Domain, while PTP messages are forwarded by processing according to the forwarding information of MPLS；For non-PTP messages, turning for MPLS is directly carried out
Hair processing.
The technology contents and technical characteristic of the present invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of the present invention, therefore, the scope of the present invention in teachings of the present invention and announcement
The revealed content of embodiment should be not limited to, and various replacements and modification without departing substantially from the present invention should be included, and is this patent Shen
Please claim covered.
Claims (10)
1. the method for PTP messages is identified in a kind of MPLS network, it is characterised in that including：
S1, encapsulation enter the message in MPLS network, identify PTP messages and non-PTP messages, and according to PTP messages and non-PTP
The difference of message, when adding two layers of head of packet outer layer Ethernet, with the ether of different ethernet type field filling messages
Net type field；
S2, dissection process is carried out to message, including identifying PTP messages, obtains the timestamp of the message, and carry out the PTP times
The update processing in domain, while forwarded the packet after obtaining the MPLS forwarding informations of message；
S3, decapsulation message, and to PTP messages, obtain the MPLS forwardings of completion message after the timestamp and forwarding information of message；
For non-PTP messages, the MPLS that message is directly completed according to forwarding information is forwarded.
2. the method for PTP messages is identified in MPLS network according to claim 1, it is characterised in that：In the S1, also wrap
The tag processes that MPLS is carried out to message are included, complete the label editing action needed for MPLS forwardings.
3. the method for PTP messages is identified in MPLS network according to claim 1, it is characterised in that：In the S1, for
PTP messages, the ethernet type domain of message is a reserved ethernet type, for non-PTP messages, the Ethernet class of message
Type domain uses standard MPLS types.
4. the method for PTP messages is identified in MPLS network according to claim 3, it is characterised in that：The PTP messages
Ethernet type field is 0xPTPType, and the ethernet type field of non-PTP messages is 0x8847.
5. the method for PTP messages is identified in MPLS network according to claim 1, it is characterised in that：In the S2, packet
It includes：
The PTP messages identified according to the ethernet type field of message；
Obtain the entry time stamp of message and MPLS forwarding informations；
PTP messages are parsed, to obtain the offset information of the type information of PTP messages and time-domain；
The time-domain of PTP messages is updated according to the time-domain offset information of PTP messages, and is turned according to MPLS forwarding informations
Hair.
6. the method for PTP messages is identified in MPLS network according to claim 1, it is characterised in that：In the S2, for
Non- PTP messages, are forwarded after directly acquiring MPLS forwarding informations.
7. the method for PTP messages is identified in MPLS network according to claim 1, it is characterised in that：The MPLS's turns
Photos and sending messages obtain by searching for MPLS forwarding tables.
8. the device of PTP messages is identified in a kind of MPLS network, it is characterised in that including：
Enter direction edge label switch router LER, for encapsulating the message into MPLS network, identify whether as PTP messages,
And according to the difference of PTP messages and non-PTP messages, when adding outer layer two layers of head of Ethernet for message, with different Ethernets
Type field fills the ethernet type domain of message；
Label Switch Router LSR identifies PTP messages for passing through ethernet type domain, obtains the time of message entrance
Stamp, and the update processing of PTP time-domains is carried out, while forward the packet according to the MPLS forwarding informations of message；Non- PTP is reported
Text is forwarded after directly acquiring MPLS forwarding informations；
Outgoing direction edge label switch router LER, for decapsulating message, and to PTP messages, obtain message timestamp and
The MPLS forwardings of message are completed after forwarding information；For non-PTP messages, the MPLS that message is directly completed according to forwarding information turns
Hair.
9. the device of PTP messages is identified in MPLS network according to claim 8, it is characterised in that：The Tag switching
Router LSR includes：
Network chip enters direction processing module, for identifying PTP messages, after obtaining the timestamp of message and MPLS forwarding informations,
It forwards the packet to PTP message processing module (MPM)s；
PTP message processing module (MPM)s for carrying out dissection process to PTP messages, obtain the type information of message and time-domain offset
It is forwarded the packet after information to chip outgoing direction processing module；
Network chip outgoing direction processing module for the time-domain offset information renewal time domain according to PTP messages, and obtains report
It is forwarded after literary MPLS forwarding informations.
10. the device of PTP messages is identified in MPLS network according to claim 9, it is characterised in that：Non- PTP is reported
Text is then forwarded to network chip outgoing direction in network chip enters direction processing module after the MPLS forwarding informations of acquisition message
Processing module, and E-Packet after carrying out MPLS decapsulations by network chip outgoing direction processing module.
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| CN101902291B (en) * | 2009-05-27 | 2014-11-05 | 华为技术有限公司 | Method, equipment and system for precise time synchronization |
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