CN104506433A - Method and device for recognizing PTP (precise time protocol) messages in MPLS (multi-protocol label switching) network - Google Patents
Method and device for recognizing PTP (precise time protocol) messages in MPLS (multi-protocol label switching) network Download PDFInfo
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Abstract
The invention discloses a method and a device for recognizing PTP (precise time protocol) messages in an MPLS (multi-protocol label switching) network. According to the method and the device, when messages entering the MPLS network are packaged by an input direction edge label switching router according to differences between the PTP massages and non-PTP messages, reserved Ethernet type domains are filled with different Ethernet type fields; when the messages are analyzed in a label switching router, the PTP messages are recognized through the Ethernet type fields, timestamps and time domain deviation information are acquired for the PTP messages, and time domain information is updated; the messages are forwarded to an output direction edge label switching router for unpackaging after MPLS forwarding information is acquired. The method and the device have the advantages that label stacks which MPLS forwarding depends on do not need to be changed, MPLS label number and structure are not changed, PTP network deployment in the MPLS network is simplified, and recognition speed of the PTP messages in the MPLS network is increased.
Description
Technical field
The present invention relates to network communication field, particularly relate to a kind of method and apparatus realizing the identification of PTP message based on hardware in an mpls network.
Background technology
Along with the development of mobile data services, mobile base station to the synchronous requirement of time also in continuous raising, in legacy network, time synchronized between mobile base station uses GPS to carry out the time synchronized of base station, but it is high that GPS synchronously also exists installation and maintenance cost, installation environment requires the problem of the aspects such as high and national telecommunication network security factor, so PTP (Precision Time Protocol, accurate clock synchronization protocol) becomes the replacement scheme of GPS.PTP is the agreement of a kind of precise synchronization defined by IEEE1588, compared with traditional Service of Timing, PTP has obvious advantage, it adopts two-way channel, precision is ns level, and expense is low, can adapt to different access environment etc., precision is constantly being required under the industry background improved, PTP has become a kind of inexorable trend of development.
PTP adopts the synchronization mechanism of principal and subordinate, and in order to improve synchronization accuracy, PTP not only requires main equipment and from recognition of devices and process PTP message, carry out the process of timestamp, the equipment between master-slave equipment also identifies PTP message, and carries out the renewal of time-domain.In mobile retransmission net, MPLS-TP is one of mainstream technology connecting master-slave equipment, the corresponding encapsulation format of IEEE1588 unpromising MPLS network application definition PTP message, so that how to carry out PTP message in MPLS (Multi-Protocol Label Switching, multiprotocol label switching) network is treated as a problem needing to solve.
At present, IETF defines a kind of PTP identifying schemes based on MPLS network at draft-davari-tictoc-1588overmpls-01.txt, adopts PTP label switched path (LSP) to solve the identification problem of PTP message in MPLS network.Between master-slave equipment, create an independently label switched path, be called Timing LSP, thus make the forwarding of PTP and the forwarding of data complete independence, MPLS equipment identifies PTP message by the message that Timing LSP transmits.Although said method solves the identification problem to PTP message on MPLS equipment, there is following limitation in it:
1) identification of message depends on the label stack of MPLS message, is unfavorable for that the network chip very first time identifies PTP message.
2) all edge devices all will set up Timing LSP with main equipment, and along with the increase of edge device, safeguard more Timing LSP, autgmentability is poor.
In addition, application number be 200810184520.7, name is called in the Chinese patent identifying the method for precision time protocol massages, Apparatus and system, also reveal that a kind of method and apparatus identifying PTP message, it identifies PTP message by inserting specific label after Tunnel LSP label.Its message format is as follows:
| Tunnel Label，Reverse Label，PW Label | DW | DA, SA, EtherType territory, 1588PTP Payload |
The label stack disclosed in this patent by changing message identifies the method for PTP message, solve the problem that in above-mentioned technology, Timing LSP number and edge device number are associated, also there is limitation and be in right its: 1) identification of message depends on the label stack of MPLS message, is unfavorable for that the network chip very first time identifies PTP message; 2) add the number of the label of MPLS, if there is multilayer labels, such as LSP over LSP, must add multiple Reverse Label in label stack simultaneously, increases the forwarding difficulty of the network equipment.
Summary of the invention
The object of the present invention is to provide the method and apparatus identifying PTP message in a kind of MPLS network, it by filling different ethernet type fields to PTP message and non-PTP message in the ethernet type territory of message Ethernet two layers of head, realize in MPLS network the identification of PTP message and process, and do not need change MPLS to forward the label stack relied on, label number and the structure of MPLS is not changed yet, thus in simplification MPLS network, identify the network design of PTP message, improve the speed identifying PTP message in MPLS network.
For achieving the above object, the present invention proposes following technical scheme: a kind of method identifying PTP message in MPLS network, comprising:
The message that S1, encapsulation enter in MPLS network, identify PTP message and non-PTP message, and according to the difference of PTP message and non-PTP message, when adding packet outer layer Ethernet two layers of head, fill the ethernet type territory of message by different ethernet type fields;
S2, dissection process is carried out to message, comprise and identify PTP message, obtain the timestamp of this message, and carry out the update process of PTP time-domain, forward the packet after obtaining the MPLS forwarding information of message simultaneously; For non-PTP message, forward after directly obtaining MPLS forwarding information;
S3, decapsulation message, and to PTP message, the MPLS completing message after obtaining the timestamp of message and forwarding information forwards; For non-PTP message, directly complete the MPLS forwarding of message according to forwarding information.
More preferably, in described S1, also comprise the tag processes of message being carried out to MPLS, complete the label editing action needed for MPLS forwarding.
More preferably, in described S1, for PTP message, the ethernet type territory of message is a reserved ethernet type, and for non-PTP message, the ethernet type territory of message uses standard MPLS type.
More preferably, the ethernet type field of described PTP message is 0xPTPType, and the ethernet type field of non-PTP message is 0x8847.
More preferably, in described S2, comprising:
According to the PTP message that the ethernet type field of message identifies;
Obtain entry time stamp and the MPLS forwarding information of message;
Resolve PTP message, with the offset information of the type information and time-domain that obtain PTP message;
Upgrade the time-domain of PTP message according to the time-domain offset information of PTP message, and forward according to MPLS forwarding information.
More preferably, the forwarding information of described MPLS transmits acquisition by searching MPLS.
Present invention further teaches the device identifying PTP message in a kind of MPLS network, comprising:
Enter direction edge label switch router LER, for encapsulating the message entering MPLS network, identify whether as PTP message, and according to the difference of PTP message and non-PTP message, when adding outer Ethernet two layers of head for message, fill the ethernet type territory of message by different ethernet type fields;
LSR LSR, for identifying PTP message by ethernet type territory, obtains the timestamp that this message enters, and carries out the update process of PTP time-domain, forwards the packet according to the MPLS forwarding information of message simultaneously; For non-PTP message, forward after directly obtaining MPLS forwarding information;
Outgoing direction edge label switch router LER, for decapsulation message, and to PTP message, the MPLS completing message after obtaining the timestamp of message and forwarding information forwards; For non-PTP message, directly complete the MPLS forwarding of message according to forwarding information.
More preferably, described LSR LSR comprises:
Network chip enters direction processing module, for identifying PTP message, after obtaining the timestamp of message and MPLS forwarding information, forwards the packet to PTP message processing module (MPM);
PTP message processing module (MPM), for carrying out dissection process to PTP message, forwards the packet to chip outgoing direction processing module after obtaining the type information of message and time-domain offset information;
Network chip outgoing direction processing module, for time-domain offset information territory update time according to PTP message, and forwards after obtaining message MPLS forwarding information.
More preferably, for non-PTP message, then enter to obtain in the processing module of direction the MPLS forwarding information of message at network chip after, be forwarded to network chip outgoing direction processing module, and E-Packet after carrying out MPLS decapsulation by network chip outgoing direction processing module.
Compared with prior art, the present invention identifies the method and apparatus of PTP message in an mpls network, it uses the ethernet type territory in message to identify, based on hard-wired, the identification of PTP message is settled at one go, namely to after obtaining the information such as timestamp after the identification of PTP message, direct update time carries out MPLS forwarding behind territory.The present invention does not need to change MPLS and forwards the label stack relied on, do not change label number and the structure of MPLS, simultaneously, do not need for PTP message reservation label and LSP resource yet, not only simplify the network design of PTP in MPLS network, also improve PTP message identifying processing speed in an mpls network.
Accompanying drawing explanation
Fig. 1 is the network topology schematic diagram identifying PTP message in MPLS network of the present invention;
Fig. 2 is the flow chart identifying PTP message in MPLS network of the present invention;
Fig. 3 is the module map identifying PTP message in MPLS network of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete whole description is carried out to the technical scheme of the embodiment of the present invention.
Composition graphs 1, shown in Fig. 2, the method of PTP message is identified in the MPLS network that the present invention discloses, its by will the message that enter in MPLS network according to the difference of PTP message and non-PTP message, different identification fields is added in the ethernet type territory of message, and then identify PTP message and non-PTP message according to the too net type field in message, and PTP message is encapsulated in edge label switch router LER (Label Edge Router) and LSR LSR (Label Swtiched Router), resolve, the process that forwards is carried out after decapsulation, specifically comprise:
S1, encapsulates the message entered in the edge label switch router LER of direction, identifies PTP message and non-PTP message, and carry out MPLS label process by entering direction edge label switch router LER.Specifically, entering direction edge label switch router LER adopts the message characteristic of IEEE1588 definition to identify PTP message: if PTP is encapsulated by UDP, then UDP destination slogan is 319 or 320; If PTP is encapsulated by Ethernet, then ethernet type thresholding is 0x88F7.
Because the direction of incoming port entering direction edge label switch router LER has the ability of criterion of identification IEEE1588 standard P TP message, therefore, once whether after message enters this inbound port, just can identify is PTP message; Then message is normally carried out to the tag processes of MPLS, to complete the label editing action needed for MPLS forwarding.
S2, entering direction edge label switch router LER is that message adds outer Ethernet two layers of head, according to the difference of PTP message and non-PTP message, fills different ethernet type fields to show difference in ethernet type territory.
When filling the ethernet type territory in message Ethernet two layers of head, if PTP message, the PTP based on MPLS network (PTP over MPLS) message form is then used to fill, ethernet type based on the PTP of MPLS network is a reserved ethernet type, represents as used 0xPTPType in the present embodiment; If be non-PTP message, then the type 0x8847 of the MPLS of standard is used to represent.So, by filling different ethernet type fields in ethernet type territory, PTP message and non-PTP message are distinguished, wherein, the form of filling the PTP message after ethernet type field is:
The form of filling the non-PTP message after ethernet type field is:
S3, in LSR LSR, identifies the PTP message and non-PTP message that are encapsulated by MPLS by ethernet type territory.The PTP Message processing process of MPLS encapsulation is as follows:
1) this PTP message of chip record enters the timestamp of chip.
2) carry out the forwarding lookup of MPLS, obtain the Tag switching forwarding information of this message.
3) PTP message processing module (MPM) skips MPLS head, the ending of MPLS head is identified by label at the bottom of the stack of MPLS, obtain meeting the UDP of IEEE1588 standard or the PTP message of Ethernet encapsulation, carry out the process of IEEE1588 official hour territory, after the process of PTP message processing module (MPM), this message has completed the renewal rewards theory of time-domain.
4) according to step 2) the MPLS forwarding information that obtains, carries out Tag switching forwarding.
For non-PTP message, then directly carry out the forwarding of normal MPLS after obtaining the MPLS information of message.
Specifically, for PTP message, first enter in the processing module of direction at the network chip of Tag switching device router LSR, PTP message is identified according to the field in ethernet type territory, and obtain the timestamp that message enters, that carries out that MPLS transmits searches, and obtains the forwarding information of MPLS, by PTP message repeating in PTP message processing module (MPM).
In the PTP message processing module (MPM) of LSR LSR, deep analysis PTP message, obtains the type information of PTP message, the offset information of time-domain in MPLS message of PTP message, PTP time-domain process action.
In the network chip outgoing direction processing module of LSR LSR, according to the skew of PTP time-domain, the information of PTP time-domain process action, carry out the renewal of time-domain, simultaneously, according to the forwarding information of MPLS, carry out the forwarding of normal MPLS, message is sent in the edge label switch router LER of outgoing direction.
For non-PTP message, then after directly obtaining its MPLS forwarding information, enter direction processing module from the network chip of LSR LSR and be forwarded to network chip outgoing direction processing module.
S4, the edge label switch router LER of outgoing direction identifies PTP message, and its recognition methods is substantially identical with the recognition methods in LSR LSR, and difference is forwarding information is not Tag switching, is the decapsulation of MPLS.For PTP message, obtain the timestamp that message enters, and by the decapsulation of MPLS, obtain the forwarding information of PTP message, complete the forwarding of message according to forwarding information, for non-PTP message, directly complete the forwarding of message according to forwarding information.
Specifically, the process of message is comprised after message enters outgoing direction edge label switch router LER:
Identify PTP message and non-PTP message by ethernet type territory, the timestamp that message enters this router is obtained for PTP message;
That carries out that MPLS transmits searches, and carries out the decapsulation of MPLS, obtains the IEEE1588PTP message of standard;
That transmits the PTP message of decapsulation searches, and obtains the forwarding information of message;
The forwarding of message is completed according to forwarding information;
For the IEEE1588PTP message of standard, by the handling process of PTP message, obtain the lastest imformation of time-domain.
Present invention further teaches the device identifying PTP message in an mpls network, described recognition device includes direction edge label switch router LER, LSR LSR and outgoing direction label edge router LER, for the identification passed through in described switch router the PTP message entered in MPLS network, its time domain information is upgraded to PTP message, and carry out MPLS repeating, to other non-PTP messages, directly normally carry out the forwarding of MPLS.
Further, described enter direction edge label switch router LER for encapsulating the message entered in MPLS network, identify PTP message and non-PTP message, and for message add outer Ethernet two layers of head time, according to the difference of PTP message and non-PTP type of message in ethernet type territory, add different ethernet type fields respectively; As in the present embodiment for PTP message, in ethernet type territory, use 0xPTPType to represent; If be non-PTP message, then the type 0x8847 of the MPLS of standard is used to represent.
Described LSR LSR is for resolving PTP message, identify from entering whether the message that direction edge label switch router LER enters is PTP message by the ethernet type territory of message, if PTP message, then obtain the timestamp that this message enters, the update process of carrying out PTP time-domain, and the MPLS carrying out message forwards; For non-PTP message, then directly carry out the forwarding of normal MPLS.
Described outgoing direction label edge router LER is used for decapsulation message and is gone out by the message repeating after decapsulation, ethernet type field according to message identifies PTP message, obtain the timestamp that message enters, and by the decapsulation of MPLS, obtain the forwarding information of PTP message, complete the forwarding of message according to forwarding information, for non-PTP message, directly complete the forwarding of message according to forwarding information.
Wherein, described LSR LSR comprises network chip and enters direction processing module, PTP message processing module (MPM) and network chip outgoing direction processing module.
Wherein said network chip enters direction processing module for identifying according to the ethernet type field in message whether this message is PTP message, for PTP message, the MPLS forwarding information obtaining the timestamp and message that message enters this module is forwarded to PTP message processing module (MPM); For non-PTP message, then directly obtain the MPLS forwarding information of message, and be forwarded to network chip outgoing direction processing module.
Described PTP message processing module (MPM) is used for carrying out deep analysis to PTP message, obtains the skew in MPLS of the type information of message, time-domain and the process action of PTP time-domain.
Described network chip outgoing direction processing module is used for the time domain information according to PTP message, upgrades the time-domain of PTP, according to the forwarding information of MPLS, PTP message is carried out forward process simultaneously; For non-PTP message, directly carry out the forward process of MPLS.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (10)
1. identify a method for PTP message in MPLS network, it is characterized in that comprising:
The message that S1, encapsulation enter in MPLS network, identify PTP message and non-PTP message, and according to the difference of PTP message and non-PTP message, when adding packet outer layer Ethernet two layers of head, fill the ethernet type territory of message by different ethernet type fields;
S2, dissection process is carried out to message, comprise and identify PTP message, obtain the timestamp of this message, and carry out the update process of PTP time-domain, forward the packet after obtaining the MPLS forwarding information of message simultaneously;
S3, decapsulation message, and to PTP message, the MPLS completing message after obtaining the timestamp of message and forwarding information forwards; For non-PTP message, directly complete the MPLS forwarding of message according to forwarding information.
2. identify the method for PTP message in MPLS network according to claim 1, it is characterized in that: in described S1, also comprise the tag processes of message being carried out to MPLS, complete the label editing action needed for MPLS forwarding.
3. in MPLS network according to claim 1, identify the method for PTP message, it is characterized in that: in described S1, for PTP message, the ethernet type territory of message is a reserved ethernet type, for non-PTP message, the ethernet type territory of message uses standard MPLS type.
4. identify the method for PTP message in MPLS network according to claim 3, it is characterized in that: the ethernet type field of described PTP message is 0xPTPType, the ethernet type field of non-PTP message is 0x8847.
5. identify the method for PTP message in MPLS network according to claim 1, it is characterized in that: in described S2, comprising:
According to the PTP message that the ethernet type field of message identifies;
Obtain entry time stamp and the MPLS forwarding information of message;
Resolve PTP message, with the offset information of the type information and time-domain that obtain PTP message;
Upgrade the time-domain of PTP message according to the time-domain offset information of PTP message, and forward according to MPLS forwarding information.
6. identify the method for PTP message in MPLS network according to claim 1, it is characterized in that: in described S2, for non-PTP message, forward after directly obtaining MPLS forwarding information.
7. identify the method for PTP message in MPLS network according to claim 1, it is characterized in that: the forwarding information of described MPLS transmits acquisition by searching MPLS.
8. identify a device for PTP message in MPLS network, it is characterized in that comprising:
Enter direction edge label switch router LER, for encapsulating the message entering MPLS network, identify whether as PTP message, and according to the difference of PTP message and non-PTP message, when adding outer Ethernet two layers of head for message, fill the ethernet type territory of message by different ethernet type fields;
LSR LSR, for identifying PTP message by ethernet type territory, obtains the timestamp that this message enters, and carries out the update process of PTP time-domain, forwards the packet according to the MPLS forwarding information of message simultaneously; For non-PTP message, forward after directly obtaining MPLS forwarding information;
Outgoing direction edge label switch router LER, for decapsulation message, and to PTP message, the MPLS completing message after obtaining the timestamp of message and forwarding information forwards; For non-PTP message, directly complete the MPLS forwarding of message according to forwarding information.
9. identify the device of PTP message in MPLS network according to claim 8, it is characterized in that: described LSR LSR comprises:
Network chip enters direction processing module, for identifying PTP message, after obtaining the timestamp of message and MPLS forwarding information, forwards the packet to PTP message processing module (MPM);
PTP message processing module (MPM), for carrying out dissection process to PTP message, forwards the packet to chip outgoing direction processing module after obtaining the type information of message and time-domain offset information;
Network chip outgoing direction processing module, for time-domain offset information territory update time according to PTP message, and forwards after obtaining message MPLS forwarding information.
10. in MPLS network according to claim 9, identify the device of PTP message, it is characterized in that: for non-PTP message, then enter to obtain in the processing module of direction the MPLS forwarding information of message at network chip after, be forwarded to network chip outgoing direction processing module, and E-Packet after carrying out MPLS decapsulation by network chip outgoing direction processing module.
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| CN104506433B (en) | 2018-07-06 |
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