CN104836799B - A kind of LDP session establishing methods and equipment - Google Patents
A kind of LDP session establishing methods and equipment Download PDFInfo
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- CN104836799B CN104836799B CN201510178743.2A CN201510178743A CN104836799B CN 104836799 B CN104836799 B CN 104836799B CN 201510178743 A CN201510178743 A CN 201510178743A CN 104836799 B CN104836799 B CN 104836799B
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- identification information
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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
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a kind of LDP session establishing methods and equipment, this method to include：LSR obtains the identification information of other LSRs after the session establishment message from other LSRs is received from the session establishment message；The LSR judges the identification information whether is recorded in session establishment list；If it is, the LSR establishes LDP sessions with other LSRs；If not, the LSR refusal establishes LDP sessions with other LSRs.In the embodiment of the present invention, by safeguarding session establishment list on LSR (i.e. LSR), so as to reduce the quantity of LDP sessions.
Description
Technical field
The present invention relates to communication technical field, more particularly, to a kind of LDP session establishing methods and equipment.
Background technology
LDP (Label Distribution Protocol, tag distribution protocol) is used for dynamically establishing LSP (Label
Switching Path, label switched path), the ip routing information of Internet is mapped to MPLS (Multi Protocol
Label Switching, multiprotocol label switching) label switched path on.Wherein, LDP sessions refer to establish in TCP
LDP connections on (Transmission Control Protocol, transmission control protocol) connection, in LSR (Label
Switch Router, LSR) between exchange FEC (Forwarding Equivalence Class, forwarding be of equal value
Class) label mapping.LDP peer refers to LDP sessions each other be present, and exchanges FEC label mapping relations by LDP sessions
Two LSR.
LDP type of messages include：It was found that (Discovery) message, for noticing and safeguarding the LSR in network, such as
Hello message.Session (Session) message, for establishing, safeguarding and terminating the session between LDP peer, such as assisting
Initialization (initialization) message of business's session parameter, Keepalive (holding) message for safeguarding session.Notice
(Advertisement) message, for creating, changing and deleting FEC label mapping relations, such as label mapping message.Notice
(Notification) message, for providing the message and error notification of suggestiveness information, such as Notification message.
The LDP courses of work include：(1) LDP peer finds and safeguarded.LSR periodically sends Hello message, notice
The presence of oneself, by Hello message, LSR can have found the LSR neighbours of surrounding automatically, and establish Hello adjoinings with it and close
System.(2) session establishment is with safeguarding.After finding LSR neighbours by interaction Hello message, LSR starts to establish session, session with it
This session is safeguarded after foundation, between LDP peer.
In radio network, LDP sessions establish model as full interconnection (Full-mesh), can not self-defined LDP sessions open up
Flutter.When LSR is more on radio network, LDP number of sessions is very more.Based on this, LSR it is upper can only default mode establish and interconnect entirely
LDP sessions, the LDP sessions of maintenance are very big to LSR performance consumption.For example, in the case of having 300 LSR in networking, each
LSR is required to safeguard 299 LDP sessions.
The content of the invention
The embodiment of the present invention provides a kind of tag distribution protocol LDP session establishing methods, and methods described includes：
LSR is after the session establishment message from other LSRs is received, from described
The identification information of other LSRs is obtained in session establishment message；
The LSR judges the identification information whether is recorded in session establishment list, the session establishment
The identification information for the LSR for allowing to establish LDP sessions is pre-configured with list；
If it is, the LSR establishes LDP sessions with other LSRs；If not,
The LSR refusal establishes LDP sessions with other LSRs.
Methods described further comprises：
The LSR judges the LSR after the session establishment message is received
On whether be pre-configured with the session establishment list；If it is, the LSR, which performs, judges session establishment
Whether the process of the identification information is recorded in list；If it is not, then the LSR is handed over other labels
Change router and establish LDP sessions.
When MPLS business be present between the LSR and other LSRs, then in institute
State the identification information that other LSRs are pre-configured with session establishment list.
The identification information is specially：The LDP marks carried in the LDP PDU of session establishment message.
Methods described further comprises：
The LSR sends the session establishment message for carrying identification information with broadcast mode.
The embodiment of the present invention provides a kind of LSR, and the LSR specifically includes：
Module is obtained, for after the session establishment message from other LSRs is received, from described
The identification information of other LSRs is obtained in session establishment message；
Judge module, for judging whether to have recorded the mark of other LSRs in session establishment list
Information；Wherein, the tag changeable path for allowing to establish tag distribution protocol LDP sessions has been pre-configured with it in the session establishment list
By the identification information of device；
Module is established, for when judged result is to be, then allowing the LSR and other labels
TSR establishes LDP sessions；When judged result is no, then refuse the LSR and other labels
TSR establishes LDP sessions.
The judge module, it is further used for after the session establishment message is received, judges the Tag switching
Whether the session establishment list has been pre-configured with router；Judge whether remember in session establishment list if it is, performing
The process of the identification information of other LSRs is recorded；
It is described to establish module, it is additionally operable to when judged result is to be previously not configured the session establishment list, then allow
The LSR establishes LDP sessions with other LSRs.
When MPLS business be present between the LSR and other LSRs, then in institute
State the identification information that other LSRs are pre-configured with session establishment list.
The identification information is specially：The LDP marks carried in the LDP PDU of session establishment message.
Also include：Sending module, the session establishment message of identification information is carried for being sent with broadcast mode.
Based on above-mentioned technical proposal, in the embodiment of the present invention, by safeguarding session on LSR (i.e. LSR)
List is established, and the identification information for the LSR for allowing to establish LDP sessions is pre-configured with session establishment list,
LDP is established so as to other LSRs for only allowing to record in LSR and session establishment list
Session, so as to reduce the quantity of LDP sessions, and the topology of MPLS business, LDP sessions and LSP three can be realized
Uniformity.
Brief description of the drawings
Fig. 1 is a kind of LDP session establishing methods schematic flow sheet provided in an embodiment of the present invention；
Fig. 2 and Fig. 3 is the application scenarios schematic diagram of the embodiment of the present invention；
Fig. 4 is a kind of structural representation of LSR provided in an embodiment of the present invention.
Embodiment
For problems of the prior art, the embodiment of the present invention provides a kind of LDP session establishing methods, such as Fig. 1 institutes
Show, the LDP session establishing methods specifically may comprise steps of：
Step 101, LSR receive the session establishment message from other LSRs it
Afterwards, the identification information of other LSRs is obtained from the session establishment message.
In the embodiment of the present invention, in radio network, each LSR (i.e. LSR) periodically sends Hello and disappeared
Breath, notices the presence of oneself, can find the neighbours of surrounding automatically by Hello message, and establish Hello adjoinings with it and close
System.During LDP session establishments afterwards, each LSR can be sent with broadcast mode and carry this Tag switching
The session establishment message of the identification information of router.Based on this, LSR is with broadcast mode to other Tag switchings
Router sends the session establishment message for the identification information for carrying this LSR, and receives other Tag switching routes
The session establishment message of the identification information for the other LSRs of carrying that device is sent with broadcast mode.
In the embodiment of the present invention, the identification information (i.e. LSR ID) of LSR is specially：Session establishment message
LDP PDU (Packet Data Unit, Packet Data Unit) in carry LDP mark.Wherein, session establishment message
LDP PDU can specifically include but is not limited to：Version number：16bit, version number is always 1 at present.PDU length：16bit, is worth and is
The length of the later data division in LDP PDU heads, not including LDP PDU heads.LDP identifies (LDP-ID)：48bit, it is preceding
32bit is the identification information of LSR, and rear 16bit be label space mark, global space 0, local interface sky
Between be 1.For example, when the LDP in the LDP PDU of session establishment message is identified as 10.1.1.2:When 0, identification (RFID) tag exchanges route
The identification information of device is 10.1.1.2, and Label space is global space.
Step 102, LSR judges other LSRs whether are recorded in session establishment list
Identification information；If it is, perform step 103；If not, perform step 104.Wherein, it is pre-configured with session establishment list
Allow the identification information for establishing the LSR of LDP sessions.
Step 103, LSR establishes LDP sessions with other LSRs.
Step 104, LSR refusal establishes LDP sessions with other LSRs.
In the embodiment of the present invention, LSR after session establishment message is received, perform step 102 it
Before, LSR judges session establishment list whether has been pre-configured with this LSR.If it is, mark
Label TSR performs the process for the identification information for judging whether to record other LSRs in session establishment list,
Perform step 102.If it is not, then LSR directly establishes LDP sessions with other LSRs, without
Step 102 is performed again.
, can be based on the MPLS business configuration session establishment lists between LSR in the embodiment of the present invention.
Further, when MPLS business between LSR and other LSRs be present, then in session establishment
The identification information of other LSRs is pre-configured with list；When LSR and other tag changeable paths
During by MPLS business being not present between device, then the mark of other LSRs is not pre-configured with session establishment list
Know information.
Application scenarios schematic diagram as shown in Figure 2, MPLS business is star, and the topology for establishing LDP sessions is opened up for star
Flutter.Spoke-A, Spoke-B, Spoke-C and HUB are LSR, and four LSRs are in same
In broadcast domain.MPLS business between Spoke-A and HUB be present, MPLS business be not present between Spoke-A and Spoke-B,
MPLS business is not present between Spoke-A and Spoke-C, MPLS business between Spoke-B and HUB be present, Spoke-B with
MPLS business is not present between Spoke-C, MPLS business between Spoke-C and HUB be present.Based on this application scenarios, on HUB
Session establishment list is not configured, and HUB identification information is included in the session establishment list configured on Spoke-A, is matched somebody with somebody on Spoke-B
Include HUB identification information in the session establishment list put, HUB mark is included in the session establishment list configured on Spoke-C
Know information.
Because non-configuration session establishes list on HUB, therefore HUB is after the session establishment message from Spoke-A is received,
HUB and Spoke-A establishes LDP sessions；After the session establishment message from Spoke-B is received, HUB and Spoke-B is established HUB
LDP sessions；For HUB after the session establishment message from Spoke-C is received, HUB and Spoke-C establishes LDP sessions.Due to
Include HUB identification information in the session establishment list configured on Spoke-A, therefore Spoke-A is receiving the session from HUB
After establishing message, Spoke-A and HUB establishes LDP sessions；Spoke-A after the session establishment message from Spoke-B is received,
Spoke-A refuses to establish LDP sessions with Spoke-B；Spoke-A after the session establishment message from Spoke-C is received,
Spoke-A refuses to establish LDP sessions with Spoke-C.Processing for Spoke-B and Spoke-C, the processing class with Spoke-A
Seemingly, will not be repeated here.
Application scenarios schematic diagram as shown in Figure 3, MPLS business is the full interconnection in part, and the topology for establishing LDP sessions is
The full interconnection topology in part.Spoke-A, Spoke-B, Spoke-C and HUB are LSR, and four tag changeable paths
It is in by device in same broadcast domain.Wherein, MPLS business between Spoke-A and HUB be present, between Spoke-A and Spoke-B
MPLS business be present, MPLS business be not present between Spoke-A and Spoke-C, MPLS business between Spoke-B and HUB be present,
MPLS business is not present between Spoke-B and Spoke-C, MPLS business between Spoke-C and HUB be present.Based on this applied field
Scape, do not configure session establishment list on HUB, identification information in the session establishment list configured on Spoke-A including HUB and
Spoke-B identification information, the mark of identification information and Spoke-A in the session establishment list configured on Spoke-B including HUB
Know information, HUB identification information is included in the session establishment list configured on Spoke-C.
Because non-configuration session establishes list on HUB, therefore HUB is after the session establishment message from Spoke-A is received,
HUB and Spoke-A establishes LDP sessions；After the session establishment message from Spoke-B is received, HUB and Spoke-B is established HUB
LDP sessions；For HUB after the session establishment message from Spoke-C is received, HUB and Spoke-C establishes LDP sessions.Due to
The identification information of identification information and Spoke-B in the session establishment list configured on Spoke-A including HUB, therefore Spoke-A
After the session establishment message from HUB is received, Spoke-A and HUB establishes LDP sessions；Spoke-A comes from Spoke- receiving
After B session establishment message, Spoke-A and Spoke-B establishes LDP sessions；Spoke-A is receiving the session from Spoke-C
After establishing message, Spoke-A refusals establish LDP sessions with Spoke-C.Spoke-B, Spoke-C processing and Spoke-A processing
It is similar, it will not be repeated here.
Based on above-mentioned technical proposal, in the embodiment of the present invention, by safeguarding session on LSR (i.e. LSR)
List is established, and the identification information for the LSR for allowing to establish LDP sessions is pre-configured with session establishment list,
LDP is established so as to other LSRs for only allowing to record in LSR and session establishment list
Session, so as to reduce the quantity of LDP sessions, and the topology of MPLS business, LDP sessions and LSP three can be realized
Uniformity.
Based on the inventive concept same with the above method, a kind of Tag switching route is additionally provided in the embodiment of the present invention
Device, as shown in figure 4, the LSR specifically includes：
Module 11 is obtained, for after the session establishment message from other LSRs is received, from institute
State the identification information that other LSRs are obtained in session establishment message；
Judge module 12, for judging whether to have recorded the mark of other LSRs in session establishment list
Know information；Wherein, the Tag switching for allowing to establish tag distribution protocol LDP sessions has been pre-configured with it in the session establishment list
The identification information of router；
Module 13 is established, for when judged result is to be, then allowing the LSR and other marks
Label TSR establishes LDP sessions；When judged result is no, then refuse the LSR and other marks
Label TSR establishes LDP sessions.
The judge module 12, it is further used for after the session establishment message is received, judges that the label is handed over
Change on router and whether be pre-configured with the session establishment list；If it is, perform judge in session establishment list whether
It has recorded the process of the identification information of other LSRs；
It is described to establish module 13, it is additionally operable to when judged result is to be previously not configured the session establishment list, then permit
Perhaps described LSR establishes LDP sessions with other LSRs.
When MPLS business be present between the LSR and other LSRs, then in institute
State the identification information that other LSRs are pre-configured with session establishment list.
The identification information is specially：The LDP marks carried in the LDP PDU of session establishment message.
In the embodiment of the present invention, the LSR, in addition to：
Sending module 14, the session establishment message of identification information is carried for being sent with broadcast mode.
Wherein, the modules of apparatus of the present invention can be integrated in one, and can also be deployed separately.Above-mentioned module can close
And be a module, multiple submodule can also be further split into.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be by
Software adds the mode of required general hardware platform to realize, naturally it is also possible to which by hardware, but the former is more in many cases
Good embodiment.Based on such understanding, what technical scheme substantially contributed to prior art in other words
Part can be embodied in the form of software product, and the computer software product is stored in a storage medium, if including
It is dry to instruct to cause a computer equipment (be personal computer, server, or network equipment etc.) to perform this hair
Method described in bright each embodiment.It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment,
Module or flow in accompanying drawing are not necessarily implemented necessary to the present invention.It will be appreciated by those skilled in the art that in embodiment
Device in module can according to embodiment describe be distributed in the device of embodiment, respective change position can also be carried out
In one or more devices different from the present embodiment.The module of above-described embodiment can be merged into a module, can also
It is further split into multiple submodule.The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.With
Several specific embodiments of the upper disclosed only present invention, still, the present invention is not limited to this, any those skilled in the art
Member can think of change should all fall into protection scope of the present invention.
Claims (10)
1. a kind of tag distribution protocol LDP session establishing methods, it is characterised in that methods described includes：
LSR is after the session establishment message from other LSRs is received, from the session
Establish in message and obtain the identification information of other LSRs；
The LSR judges the identification information whether is recorded in session establishment list, the session establishment list
Inside it is pre-configured with the identification information for the LSR for allowing to establish LDP sessions；
If it is, the LSR establishes LDP sessions with other LSRs；It is if not, described
LSR is refused to establish LDP sessions with other LSRs.
2. the method as described in claim 1, it is characterised in that methods described further comprises：
The LSR after the session establishment message is received, judge be on the LSR
It is no to be pre-configured with the session establishment list；If it is, the LSR, which performs, judges session establishment list
Inside whether record the process of the identification information；If it is not, then the LSR and other tag changeable paths
LDP sessions are established by device.
3. the method as described in claim 1, it is characterised in that when the LSR and other Tag switchings
When multiprotocol label switching MPLS business between router be present, then it is pre-configured with the session establishment list described other
The identification information of LSR.
4. the method as described in claim 1 or 3, it is characterised in that the identification information is specially：The session establishment message
LDP Packet Data Units PDU in carry LDP mark.
5. the method as described in claim 1, it is characterised in that methods described further comprises：
The LSR sends the session establishment message for carrying identification information with broadcast mode, so that other marks
Label TSR receives the session establishment message.
6. a kind of LSR, it is characterised in that the LSR specifically includes：
Module is obtained, for after the session establishment message from other LSRs is received, from the session
Establish in message and obtain the identification information of other LSRs；
Judge module, for judging that the mark that other LSRs whether are have recorded in session establishment list is believed
Breath；Wherein, the Tag switching that being pre-configured with the session establishment list allows to establish tag distribution protocol LDP sessions is route
The identification information of device；
Module is established, for when judged result is to be, then allowing the LSR and other Tag switchings
Router establishes LDP sessions；When judged result is no, then refuse the LSR and other Tag switchings
Router establishes LDP sessions.
7. LSR as claimed in claim 6, it is characterised in that
The judge module, it is further used for after the session establishment message is received, judges the Tag switching route
Whether the session establishment list has been pre-configured with device；Judge whether have recorded in session establishment list if it is, performing
The process of the identification information of other LSRs；
It is described to establish module, it is additionally operable to when judged result is to be previously not configured the session establishment list, then described in permission
LSR establishes LDP sessions with other LSRs.
8. LSR as claimed in claim 6, it is characterised in that when the LSR with it is described its
When multiprotocol label switching MPLS business between its LSR be present, then match somebody with somebody in advance in the session establishment list
Put the identification information of other LSRs.
9. the LSR as described in claim 6 or 8, it is characterised in that the identification information is specially：The meeting
Words establish the LDP marks carried in the LDP Packet Data Units PDU of message.
10. LSR as claimed in claim 6, it is characterised in that also include：
Sending module, the session establishment message of identification information is carried for being sent with broadcast mode.
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| CN201510178743.2A CN104836799B (en) | 2015-04-15 | 2015-04-15 | A kind of LDP session establishing methods and equipment |
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| CN201510178743.2A CN104836799B (en) | 2015-04-15 | 2015-04-15 | A kind of LDP session establishing methods and equipment |
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| EP1580943A2 (en) * | 2004-03-25 | 2005-09-28 | Alcatel | Full mesh LSP and full mesh T-LDP provisioning between provider edge routers in support of layer-2 and layer-3 virtual private network services |
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| CN104836799A (en) | 2015-08-12 |
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