CN108156076A - BFD message structure based on MP L S-TP linear protection, detection method and device - Google Patents
BFD message structure based on MP L S-TP linear protection, detection method and device Download PDFInfo
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- CN108156076A CN108156076A CN201711361256.5A CN201711361256A CN108156076A CN 108156076 A CN108156076 A CN 108156076A CN 201711361256 A CN201711361256 A CN 201711361256A CN 108156076 A CN108156076 A CN 108156076A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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Abstract
The invention discloses a BFD message structure based on MP L S-TP linear protection, a detection method and a detection device, wherein the BFD message structure comprises an Ethernet message head, an MP L S message head, an IP message head, a UDP message head and a BFD control message, wherein the tag value of the MP L S message head is a main tunnel tag or a standby tunnel tag of an MP L S-TP linear protection group, the source IP address of the IP message head is NODE _ ID of a local end MEG, the target IP address of the IP message head is a 127/24 address, the target port number of the UDP message head is a standard BFD port number and is marked as the BFD control message, and the BFD control message content.
Description
Technical field
The present invention relates to the communications fields, more particularly to a kind of to be based on MPLS-TP (Multiprotocol Label
Switching transport profile, multiprotocol label switching-transmission application) linear protection BFD
(Bidirectional Forwarding Detection, two-way converting detection) message structure, detection method and device.
Background technology
MPLS-TP technologies are used for Packet Transport Network, and the data service capacity of bigger is provided for network.ITU-T is organized with G systems
Row standard has issued the technical standard of MPLS-TP and the consensus standard (ITU-T is G.8131/Y.1382) of linear protection, the skill
CCM (Continuity check message, detection of connectivity message) conduct during ITU-T is used in art standard Y.1731
The testing mechanism that linear protection primary channel is switched.Due to the technical standard and the otherness of MPLS, cause not for IETF and
Traditional router vendors are received.
Therefore it needs to propose a kind of path connectivity checking mechanism that can be applicable in MPLS-TP linear protections.
Invention content
In view of this, the present invention is intended to provide a kind of BFD message structures based on MPLS-TP linear protections, detection method
With device, to realize the path connectivity inspection of MPLS-TP linear protections.
Specifically, a kind of BFD message structures based on MPLS-TP linear protections of the present invention, including：Ethernet message head；
MPLS headings, main tunnel label or standby tunnel label of the label value for MPLS-TP linear protection groups；IP packet head, source
IP address is the NODE_ID of local terminal MEG, and destination IP is 127/24 address；UDP headings, destination slogan are the BFD of standard
Port numbers are denoted as BFD control messages；And BFD control message contents.
Further, the length of the Ethernet message head for 14 bytes and/or, the length of the MPLS headings is 4 words
Section.
Further, the length of the IP packet head for 20 bytes and/or, the UDP headings are 8 bytes.
Specifically, a kind of BFD detection methods based on MPLS-TP linear protections of the present invention, including：
The static parameter of BFD is configured on the MEP of equipment；The configuration parameter of BFD is issued in FPGA, and in FPGA
The encapsulation and transmitting-receiving of BFD messages are completed, wherein, the structure of the BFD messages is any of the above-described kind of BFD message structures；Encapsulation
BFD afterwards carries out label forwarding along the tunnel path of MPLS-TP；Whether normally received and dispatched according to BFD messages, corresponding detection determines
The tunnel path of the MPLS-TP is normal or abnormal.
Further, the static parameter includes at least one of following parameter：The local mark of BFD sessions, distal end
Mark, minimum are given out a contract for a project interval, minimum packet receiving interval and detection multiple.
Further, the minimum be divided between giving out a contract for a project 3.3ms and/or, it is described detection multiple be 3.
Further, it is normally further included later in the tunnel path for determining the MPLS-TP：It is communicated to the line of MPLS-TP
Property protection group, main tunnel links or standby tunnel links state UP；After the tunnel path for determining the MPLS-TP is abnormal also
Including：According to pre-setting, the linear protection group for triggering the MPLS-TP is switched.
Further, the linear protection group of the triggering MPLS-TP the step of switching after include：When described
When the tunnel path of MPLS-TP is restored, for detecting the BFD session status UP of the tunnel path connectivity of the MPLS-TP, and
Determine whether the switchback of triggering linear protection group.
Specifically, a kind of BFD detection devices based on MPLS-TP linear protections of the present invention, including initialization unit, are used
In the static parameter that BFD is configured on the MEP in equipment；The configuration parameter of BFD is issued in FPGA by encapsulation unit, and
The encapsulation and transmitting-receiving of BFD messages are completed in FPGA, wherein, the structure of the BFD messages is any of the above-described kind of BFD message knots
Structure；Transmitting element carries out label forwarding for the BFD after encapsulating along the tunnel path of MPLS-TP；Detection unit is used for
Whether normally received and dispatched according to BFD messages, corresponding detection determines that the tunnel path of the MPLS-TP is normal or abnormal.
Further, the static parameter includes at least one of following parameter：The local mark of BFD sessions, distal end
Mark, minimum are given out a contract for a project interval, minimum packet receiving interval and detection multiple.
Further, the BFD detection devices further include：Notification unit, in the tunnel for determining the MPLS-TP
After path is normal, it is communicated to the linear protection group of MPLS-TP, main tunnel links or standby tunnel links state UP；Switch control
Unit processed, for after the tunnel path exception of the MPLS-TP is determined, according to pre-setting, triggering the MPLS-TP's
Linear protection group is switched.
Further, BFD detection devices further include：Switchback control unit, it is extensive for working as the tunnel path of the MPLS-TP
When multiple, for detecting the BFD session status UP of the tunnel path connectivity of the MPLS-TP, and determine whether to trigger linear guarantor
The switchback of shield group.
BFD message structures, detection method and the device based on MPLS-TP linear protections of the present invention, it is specific by setting
BFD message structures, and be detected based on the message structure, the MPLS-TP that BFD technologies are extended to ITU-T formulations is linear
It protects under scene, fast path connectivity checks is provided for linear protection.
Description of the drawings
It is incorporated into specification and the attached drawing of a part for constitution instruction shows the embodiment of the present invention, and with
Principle for explaining the present invention together is described.In the drawings, similar reference numeral is used to represent similar element.Under
Attached drawing in the description of face is some embodiments of the present invention rather than whole embodiments.Those of ordinary skill in the art are come
It says, without creative efforts, other attached drawings can be obtained according to these attached drawings.
Fig. 1 is the networking schematic diagram that the embodiment of the present invention is disposed in MPLS-TP linear protection networks；
Fig. 2 is a kind of BFD message structure figures based on MPLS-TP linear protections provided in an embodiment of the present invention；
Fig. 3 is a kind of flow chart of the BFD detection methods based on MPLS-TP linear protections provided in an embodiment of the present invention；
Fig. 4 is the flow of another BFD detection methods based on MPLS-TP linear protections provided in an embodiment of the present invention
Figure；
Fig. 5 is a kind of structural frames of the BFD detection devices based on MPLS-TP linear protections provided in an embodiment of the present invention
Figure.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without making creative work shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the feature in embodiment and embodiment in the application mutually can be combined arbitrarily.
The invention will now be described in detail with reference to the accompanying drawings implement be related to the BFD message structures based on MPLS-TP linear protections,
Detection method and device, the schematic diagram of a scenario that each embodiment is related to refer to Fig. 1.Wherein, which is and is based on
The MPLS-TP linear protection scenes that ITU-T is formulated.As shown in Figure 1, respectively in tri- upper side administration MPLS-TP of PE1, P, PE2
Establish two tunnels of operating path and Protection path.Then the BFD models pointed out respectively using the present invention come monitoring path
With the tunnel connectivity of Protection path, protected so as to fulfill the service channel carrier class between CE1 and CE2.
Embodiment one：
As shown in Fig. 2, a kind of BFD message structures based on MPLS-TP linear protections, the authentication method include：Ether
Heading；MPLS headings, main tunnel label or standby tunnel label of the label value for MPLS-TP linear protection groups；IP packet
Head, source IP address are the NODE_ID of local terminal MEG, and destination IP is 127/24 address；UDP headings, destination slogan are mark
Accurate BFD port numbers are denoted as BFD control messages；And BFD control message contents.
During concrete operations, the length of the Ethernet message head can be 14 bytes；The length of the MPLS headings can be with
For 4 bytes；The length of the IP packet head can be 20 bytes and/or, the UDP headings is can be with 8 bytes.The BFD is reported
IP packet (GAL+ACH+BFD of band two layers label that non-ietf standard use control message format) of the text for standard, the control of BFD
Message processed is carried in UDP, and destination slogan is the BFD port numbers of standard.In order to realize the MPLS-TP lines formulated ITU-T
Property protection scene primary channel detection, the IP packet of BFD, which is carried on the label forwarding tunnel of MPLS-TP establishments, to be turned
Hair, therefore be encapsulated under the MPLS heads for carrying corresponding tunnel label from the BFD messages that the MEP of MEG is sent out.Simultaneously for reality
Now with the consistency of the BFD technologies under MPLS scenario, UDP messages carrying BFD control messages have been used in invention, IP packet voices
Source address is the NODE_ID of MEG specified in ITU-T, and destination address is fixed 127/24 loopback address.
The present embodiment is detected by setting specific BFD message structures, and based on the message structure, by BFD technologies
It is extended under the MPLS-TP linear protection scenes of ITU-T formulations, fast path connectivity checks is provided for linear protection.
Embodiment two：
As shown in figure 3, a kind of BFD detection methods based on MPLS-TP linear protections, including：
First, the static parameter of BFD is configured on the MEP of equipment；
Secondly, the configuration parameter of BFD is issued in FPGA, and the encapsulation and transmitting-receiving of BFD messages is completed in FPGA；
Then, the BFD after encapsulation carries out label forwarding along the tunnel path of MPLS-TP；
Again, whether normally received and dispatched according to BFD messages, corresponding detection determine the tunnel path of the MPLS-TP it is normal or
It is abnormal.
During concrete operations, the static parameter includes at least one of following parameter：The local of BFD sessions identifies, is remote
End mark, minimum are given out a contract for a project interval, minimum packet receiving interval and detection multiple.The minimum be divided between giving out a contract for a project 3.3ms and/or, institute
It is 3 to state detection multiple.The mechanism given out a contract for a project using FPGA as BFD microcodes is turned for detecting the label in MPLS-TP between MEG
Send out the link detecting in tunnel.Local mark, distal marker, the minimum that the BFD sessions used on MEG can be configured in equipment are given out a contract for a project
Interval, minimum packet receiving interval and detection multiple, the configuration mode of this BFD belong to static configuration, need to ensure between MEG
Local mark and distal marker in BFD are mutually matched, and could normally set up BFD sessions.Certainly, remote equipment and local terminal
Equipment can also receive and dispatch the rate of BFD messages according to parameter configuration adjust automatically.
Preferably, it is normally further included later in the tunnel path for determining the MPLS-TP：
It is communicated to the linear protection group of MPLS-TP, main tunnel links or standby tunnel links state UP；
It is further included after the tunnel path for determining the MPLS-TP is abnormal：
According to pre-setting, the linear protection group for triggering the MPLS-TP is switched.
Preferably, the linear protection group of the triggering MPLS-TP the step of switching after include：
When the tunnel path of the MPLS-TP is restored, for detecting the tunnel path connectivity of the MPLS-TP
BFD session status UP, and determine whether to trigger the switchback of linear protection group.
The present embodiment is detected by setting specific BFD message structures, and based on the message structure, by BFD technologies
It is extended under the MPLS-TP linear protection scenes of ITU-T formulations, fast path connectivity checks is provided for linear protection, realize
Carrier class Fast Convergent in 50ms realizes accurate label forwarding chain under the MPLS-TP linear protection scenes formulated ITU-T
It road fault detect and quickly switches, BFD sessions static configuration transmitting-receiving inter-packet gap is provided, minimum, which is supported to give out a contract for a project, is spaced 3.3ms.
Embodiment three：
As shown in figure 4, another BFD detection methods based on MPLS-TP linear protections, including：
The first step：Equipment supports that BFD sessions are configured on the substandard MEP of ITU-T MPLS-TP, on the MEP of equipment
The static parameter of BFD is configured, for supporting the BFD conversation establishings between MEG；The static parameter include local mark, distal marker,
Minimum packet receiving interval, minimum are given out a contract for a project interval, detection multiple etc.；
Second step：Software carries out BFD configuration parameter testings and stores BFD session informations in protocol layer；
Third walks：Whether the MPLS-TP tunnels detected required for BFD are normal, and whether BFD parameters are reasonable；
4th step：MPLS-TP tunnels are normal, BFD Rational Parameters, then complete BFD sessions and the detection in MPLS-TP tunnels is tied up
Determine relationship；
5th step：Start the encapsulation and transmission of BFD messages, the transmitting-receiving of message is completed by FPGA, message format is according to invention
Requirement encapsulation；Specifically, the configuration parameter of BFD is issued in FPGA, completes in FPGA the encapsulation of BFD messages, message
Transmitting-receiving and the maintenance of state machine.The message of BFD is finally sent out from the NHI outgoing interfaces in MPLS-TP tunnels, and message carries going out for tunnel
Label carries out label forwarding along the tunnel path of MPLS-TP；
6th step：Monitor the connectivity in MPLS-TP tunnels；
7th step：BFD state machines are safeguarded, including reporting for UP and DOWN events；Specifically include：The message of BFD is normal
After transmitting-receiving, the session status UP of BFD, while the linear protection group of MPLS-TP is communicated to, main or standby tunnel link states UP；
8th step：When tunnel failure, BFD notice MPLS-TP linear protections groups complete corresponding pretection switch；Specifically
Ground, in MPLS-TP between MEG during tunnel fails, BFD can realize quick detection (the minimum transmitting-receiving inter-packet gap of minimum 10ms
3.3ms, minimum detection multiple is 3) the BFD session DOWN of MEP, while is noticed on the corresponding tunnel of MPLS-TP linear protection groups
The number of notifying transmission failure (Signal fail) (work/protect) is switched so as to trigger the quick of linear protection group, is realized
The business convergence of carrier class；
9th step：When BFD notices failure tunnel restoration, whether switchback is needed to operate according to the configuration determination of user, i.e.,：
When failure tunnel restoration between the MEG of MPLS-TP, for detecting the BFD session status UP of the tunnel connectivity, and it is communicated to
The corresponding tunnel Signal fail clear (wrok/protect) of MPLS-TP linear protection groups, triggering linear protection group are returned
(if any switchback when needing) is cut, while returns to the 6th step.
Certainly, user can be according to the parameter of the actual needs modulation BFD of MPLS-TP linear protection networkings, to avoid not wishing
The masterslave switchover of prestige.Such as network signal quality it is poor when, big BFD transmitting-receiving message minimum intervals and detection times can be configured
Number, BFD detections to be caused to become insensitive, so as to avoid undesirable switch.
Example IV：
As shown in figure 5, a kind of BFD detection devices based on MPLS-TP linear protections include：
Initialization unit, for the static parameter of BFD to be configured on the MEP of equipment；
The configuration parameter of BFD is issued in FPGA by encapsulation unit, and encapsulation and the receipts of BFD messages are completed in FPGA
Hair；
Transmitting element carries out label forwarding for the BFD after encapsulating along the tunnel path of MPLS-TP；
Detection unit, whether for normally being received and dispatched according to BFD messages, corresponding detection determines the tunnel road of the MPLS-TP
Diameter is normal or abnormal.
Wherein, the static parameter includes at least one of following parameter：The local marks of BFD sessions, distal marker,
Minimum is given out a contract for a project interval, minimum packet receiving interval and detection multiple.
Preferably, BFD detection devices further include：
Notification unit, for after the tunnel path for determining the MPLS-TP is normal, being communicated to the linear of MPLS-TP
Protection group, main tunnel links or standby tunnel links state UP；
Switching control unit, for after the tunnel path exception of the MPLS-TP is determined, according to pre-setting, touching
The linear protection group for sending out MPLS-TP described is switched.
Preferably, BFD detection devices further include：
Switchback control unit, for when the tunnel path of the MPLS-TP is restored, for detecting the MPLS-TP's
The BFD session status UP of tunnel path connectivity, and determine whether to trigger the switchback of linear protection group.
The present embodiment is detected by setting specific BFD message structures, and based on the message structure, by BFD technologies
It is extended under the MPLS-TP linear protection scenes of ITU-T formulations, fast path connectivity checks is provided for linear protection, realize
Carrier class Fast Convergent in 50ms realizes accurate label forwarding chain under the MPLS-TP linear protection scenes formulated ITU-T
It road fault detect and quickly switches, BFD sessions static configuration transmitting-receiving inter-packet gap is provided, minimum, which is supported to give out a contract for a project, is spaced 3.3ms.
It will appreciated by the skilled person that realize all or part of step/units/modules of above-described embodiment
It can be completed by the relevant hardware of program instruction, foregoing routine can be stored in computer read/write memory medium, should
Program when being executed, performs and includes step corresponding in above-described embodiment each unit；And aforementioned storage medium includes：ROM、
The various media that can store program code such as RAM, magnetic disc or optical disc.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (12)
1. a kind of BFD message structures based on MPLS-TP linear protections, which is characterized in that including：
Ethernet message head；
MPLS headings, main tunnel label or standby tunnel label of the label value for MPLS-TP linear protection groups；
IP packet head, source IP address are the NODE_ID of local terminal MEG, and destination IP is 127/24 address；
UDP headings, destination slogan are the BFD port numbers of standard, are denoted as BFD control messages；And
BFD controls message content.
2. the BFD message structures based on MPLS-TP linear protections as described in claim 1, which is characterized in that the ether report
The length of literary head for 14 bytes and/or, the length of the MPLS headings is 4 bytes.
3. the BFD message structures based on MPLS-TP linear protections as claimed in claim 1 or 2, which is characterized in that the IP
The length of heading for 20 bytes and/or, the UDP headings are 8 bytes.
4. a kind of BFD detection methods based on MPLS-TP linear protections, which is characterized in that including：
The static parameter of BFD is configured on the MEP of equipment；
The configuration parameter of BFD is issued in FPGA, and the encapsulation and transmitting-receiving of BFD messages are completed in FPGA；Wherein, it is described
The structure of BFD messages is the BFD message structures as described in any one of claim 1-3；
BFD after encapsulation carries out label forwarding along the tunnel path of MPLS-TP；
Whether normally received and dispatched according to BFD messages, corresponding detection determines that the tunnel path of the MPLS-TP is normal or abnormal.
5. BFD detection methods as claimed in claim 4, which is characterized in that the static parameter is included in following parameter extremely
It is one few：Local mark, distal marker, the minimum of BFD sessions, which are given out a contract for a project, interval, minimum packet receiving interval and detects multiple.
6. the BFD detection methods as described in right wants 5, which is characterized in that the minimum be divided between giving out a contract for a project 3.3ms and/or, institute
It is 3 to state detection multiple.
7. the BFD detection methods as described in any one of claim 4-6, which is characterized in that
It is normally further included later in the tunnel path for determining the MPLS-TP：
It is communicated to the linear protection group of MPLS-TP, main tunnel links or standby tunnel links state UP；
It is further included after the tunnel path for determining the MPLS-TP is abnormal：
According to pre-setting, the linear protection group for triggering the MPLS-TP is switched.
8. the BFD detection methods as described in right wants 7, which is characterized in that the linear protection group of the triggering MPLS-TP
Include after the step of switching：
When the tunnel path of the MPLS-TP is restored, for detecting the BFD meetings of the tunnel path connectivity of the MPLS-TP
Speech phase UP, and determine whether to trigger the switchback of linear protection group.
9. a kind of BFD detection devices based on MPLS-TP linear protections, which is characterized in that including：
Initialization unit, for the static parameter of BFD to be configured on the MEP of equipment；
The configuration parameter of BFD is issued in FPGA by encapsulation unit, and the encapsulation and transmitting-receiving of BFD messages are completed in FPGA；Its
In, the structure of the BFD messages is the BFD message structures as described in any one of claim 1-3；
Transmitting element carries out label forwarding for the BFD after encapsulating along the tunnel path of MPLS-TP；
Detection unit, whether for normally being received and dispatched according to BFD messages, corresponding detection is determining the tunnel path of the MPLS-TP just
It is often or abnormal.
10. BFD detection devices as claimed in claim 9, which is characterized in that the static parameter is included in following parameter extremely
It is one few：Local mark, distal marker, the minimum of BFD sessions, which are given out a contract for a project, interval, minimum packet receiving interval and detects multiple.
11. the BFD detection devices as described in claim 9 or 10, which is characterized in that further include：
Notification unit, for after the tunnel path for determining the MPLS-TP is normal, being communicated to the linear protection of MPLS-TP
Group, main tunnel links or standby tunnel links state UP；
Switching control unit, for after the tunnel path exception of the MPLS-TP is determined, according to pre-setting, triggering institute
State switching for the linear protection group of MPLS-TP.
12. the BFD detection devices as described in right wants 11, which is characterized in that further include：
Switchback control unit, for when the tunnel path of the MPLS-TP is restored, for detecting the tunnel of the MPLS-TP
The BFD session status UP of path connectivity, and determine whether to trigger the switchback of linear protection group.
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| CN106789390A (en) * | 2016-04-28 | 2017-05-31 | 新华三技术有限公司 | A kind of pseudo-wire condition detection method and device |
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