CN103905307B - A kind of more topological path label notifying methods of MPLS and equipment - Google Patents
A kind of more topological path label notifying methods of MPLS and equipment Download PDFInfo
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Abstract
The present invention discloses a kind of more topological path label notifying methods of MPLS and equipment, this method is applied to MPLS network, it is that FEC distributes more topological path labels by the edge device in MPLS network, and safeguard local label forward table, and more topological path labels are carried on to the designated area of the label field of FEC label mapping messages, it is advertised to the LDP neighbours of this equipment, and, after more topological path labels are parsed from the FEC label mapping messages received, safeguard local label forward table, simplify the processing that MPLS network equipment is noticed more topological path labels, improve the convenience of more topological path label notices；The embodiment of the present invention can utilize the existing network equipment to realize, cost-effective without carrying out hardware modification to conventional network equipment.
Description
Technical field
The present invention relates to technical field of communication network, more particularly to a kind of more topological path label notifying methods of MPLS and set
It is standby.
Background technology
MPLS（Multi-Protocol Label Switching, multiprotocol label switching）Technology is a kind of is used for quickly
The technology of packet-switching and route, the abilities such as target, route, forwarding and exchange are provided for network traffic data.
The key of MPLS technology is the introduction of the concept of label, and IP address is mapped as into the simple mark with regular length
Label, for different bag forwardings and packet technology.After edge device in MPLS network receives packet, analyze data bag
Content, select suitable label for these packets, and be sent in MPLS network using the Tag Packaging packet.MPLS
All-router all substitutes IP heads as forwarding foundation using this short, regular length label in network, when packet is final
When leaving MPLS network, label is peeled off by the edge device in MPLS network.Packet is forwarded using MPLS technology, improves number
According to forward efficiency.
MPLS is more, and topology refers in MPLS network, by extending mpls protocol, fictionalizes multiple logical topologys, Mei Getuo
Respective Tag switching and forward-path are flutterred, logic isolation between each topology.Generally, in an mpls network, there is the mutually same trade
The message of service type has identical FEC（Forwarding Equivalence Class, forwarding equivalence class）, same FEC's
Service message is forwarded by same MPLS forward-paths.
MPLS network can support multiple more topological path labels, and these more topological path labels exist with stack.
Existing more topological path labels are by newly increasing one layer of label in label stack, to identify the forwarding road belonging to logical topology
Footpath（The forward-path of equal-cost route）.Existing more topological path label notice schemes, are obtaining the mistake of more topological path labels
Cheng Zhong, lookup number is added, but also hardware modification, complicated technology realization are carried out to existing router.
Therefore, a kind of more topological path label notice schemes of MPLS are needed badly to solve the above problems.
The content of the invention
The invention provides a kind of more topological path label notifying methods of MPLS and equipment, to solve more topological path marks
The problem of complicated, is realized in label notice, improves the convenience of more topological path label notices.
Therefore, the embodiment of the present invention adopts the following technical scheme that：
The embodiment of the present invention provides a kind of more topological path label notifying methods of MPLS, applied to MPLS network, this method
Including：
, will be described more topological after edge device in MPLS network distributes more topological path labels for forwarding equivalence class FEC
Path label is configured in local label forward table, and more topological path labels are carried on into FEC label mapping messages
The designated area of label field, it is advertised to the tag distribution protocol LDP neighbours of this equipment；
After the edge device receives the FEC label mapping messages of its LDP neighbor advertisement, from the FEC label mappings
The designated area of the label field of message parses more topological path labels, and is configured according to the more topological path labels parsed
Local label forward table.
The embodiment of the present invention also provides a kind of more topological path label notifying methods of MPLS, applied to MPLS network, including：
After provider's P equipment in MPLS network receives the FEC label mapping messages of its LDP neighbour transmission, from described
The designated area of the label field of FEC label mapping messages parses more topological path labels；
The more topological path labels parsed are carried on the finger of the label field of FEC label mapping messages by the P equipment
Determine the LDP neighbours that region is sent to this equipment, and the more topological path labels parsed are configured in local label forward table.
The embodiment of the present invention also provides a kind of edge device, applied to MPLS network, including：
Label distribute module, for distributing more topological path labels for forwarding equivalence class FEC；
Label Forwarding Information Base maintenance module, for more topological path labels that the label distribute module is FEC distribution to be matched somebody with somebody
Put in local label forward table；And after the FEC label mapping messages of LDP neighbor advertisements of this equipment are received, from institute
The designated area for stating the label field of FEC label mapping messages parses more topological path labels, and is opened up according to what is parsed more
Flutter path label configuration local label forward table；
Label announcement module, for more topological path labels that the label distribute module is FEC distribution to be carried on into FEC
The designated area of the label field of label mapping message, it is advertised to the tag distribution protocol LDP neighbours of this equipment.
The embodiment of the present invention also provides a kind of provider P equipment, applied to MPLS network, including：
Receiving module, for receiving the FEC label mapping messages of its LDP neighbour transmission；
Label Forwarding Information Base maintenance module, for the label word of the FEC label mapping messages received from the receiving module
The designated area of section parses more topological path labels, and the more topological path labels parsed are configured into local label forwarding
In table；
Forwarding module, more topological path labels for the Label Forwarding Information Base maintenance module to be parsed are carried on FEC
The designated area of the label field of label mapping message, it is sent to the LDP neighbours of this equipment.
Compared with prior art, the above embodiment of the present invention has following advantageous effects：
The above embodiment of the present invention, it is that FEC distributes more topological path labels by the edge device in MPLS network, and ties up
Local label forward table is protected, and more topological path labels are carried on to the designated area of the label field of FEC label mapping messages,
The LDP neighbours of this equipment are advertised to, and, after more topological path labels are parsed from the FEC label mapping messages received,
Local label forward table is safeguarded, simplifies the processing that MPLS network equipment is noticed more topological path labels, is improved more topological
The convenience of path label notice；The embodiment of the present invention can utilize the existing network equipment to realize, without being set to existing network
Standby progress hardware modification, it is cost-effective.
Brief description of the drawings
Fig. 1 is the TLV structural representations of the how topological abilities of LDP provided in an embodiment of the present invention；
Fig. 2 is FEC label mapping messages form schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the network architecture schematic diagram of application scenarios of the embodiment of the present invention；
Fig. 4 is edge device structural representation provided in an embodiment of the present invention；
Fig. 5 is P device structure schematic diagrams provided in an embodiment of the present invention.
Embodiment
In view of the above-mentioned problems existing in the prior art, the embodiments of the invention provide a kind of more topological path labels of MPLS to lead to
Announcement scheme, to simplify the processing that the router in MPLS network is noticed more topological path labels, improve more topological path marks
The convenience of notice is signed, it is cost-effective.
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
PE is generally included in MPLS network（Provider Edge, there is provided business edge）Equipment and P（Provider, there is provided
Business）Equipment, PE equipment are to provide the access device of business's network, with CE（Customer Edge, customer network edge）Equipment connects
Connect；P equipment is to provide the network equipment that any CE equipment is not connected in business's network.PE equipment and P equipment are by inquiring about this equipment
On Label Forwarding Information Base forwarding user data message.PE equipment and P equipment are generally realized by router.
Router in MPLS network can support more topological paths to forward, and a FEC uniquely corresponds to topological path more than one,
In such cases, the router in MPLS network is needed to distribute how topological label for FEC, and topology more is carried out in MPLS network
Path label is noticed, to ensure the user data of same type（Same FEC user data）Can be in MLPS networks with phase
Same topological path is forwarded.
Router in MPLS network is established each other LDP（Label distribution protocol, label
Distribution protocol）Neighborhood, more topological path label notices are carried out between LDP neighbours.
The embodiment of the present invention is extended to LDP session establishment processes, is consulted with realizing by LDP session establishments process
More topological ability, the notice for follow-up more topological path labels are prepared.
Generally, LDP session establishments flow includes：
Hello message is mutually sent between two routers for needing to establish LDP neighbours, both sides are established using transmission address
TCP（Transit Control Protocol, transmission control protocol）Connection, after TCP connections are successfully established, is sent out by masters
Send Initialization（Initialization）Message, consult to establish the relevant parameter of LDP sessions.Passive side receives
After Initialization message, if receiving relevant parameter, Initialization message is sent to masters, and to actively
Side sends keepalive（Keep-alive）Message.After masters receive the keepalive message of opposite end transmission, if receiving related ginseng
Number, then send keepalive message, after both sides receive the keepalive message of opposite end, LDP session establishments to passive side
Success, both sides enter LDP session running statuses, both sides LDP neighbours each other.
How topological capability negotiation is carried out during LDP session establishments in order to realize, can be disappeared in Initialization
How topological ability TLV defined in breath（Type-length-value, Tag-Length-Value）.Fig. 1 shows a kind of how topological ability
TLV form, wherein：
Multi-Topology Cap.（More topological ability）：For identifying the type of the TLV, i.e. represent that the TLV is used for
Carry how topological ability information；
Length（Length）：Represent the length of the TLV；
Typed Wildcard FEC element(s)（The forwarding equivalence class unit of belt type mark）：It is one or more
FEC units, for carrying how topological ability information
More topological path labels notice of MPLS network is carried out between LDP neighbours, more topological path labels of MPLS network
Issue includes：Downstream on Demand is distributed and two ways is independently distributed in downstream.The embodiment of the present invention still carries according to prior art
The mode of confession carries out how topological label notice, and simply the form of the label mapping message of interaction during this is improved.
Learn that its LDP neighbour has a case that how topological ability by how topological capability negotiation below with the router in MPLS network
Exemplified by, respectively in connection with both methods of salary distribution, describe more topological path label notice procedures in detail.
Mode one：Downstream is independently distributed
When PE equipment finds occur new destination address in this equipment routing table, and the address be not belonging to it is any existing
During FEC, PE equipment is that the destination address establishes a new FEC.PE equipment is that the newly-established FEC is selected and distributed more than one
Topological path label（MT-ID）, wherein, the topological path in MT-ID unique mark MPLS networks.PE equipment is newly-established by this
FEC and the label for FEC distribution（MT-ID）And its incidence relation is configured in local label forward table, and by the FEC and right
The MT-ID answered is carried on FEC label mapping messages, is sent to the LDP neighbours of this equipment（The LDP neighbours are probably PE equipment,
It is probably P equipment）.
If its LDP neighbour is PE equipment, after the LDP neighbours receive the FEC label mapping messages, therefrom parse
Go out FEC and MT-ID, and the FEC parsed and MT-ID are configured in local label forward table.
If its LDP neighbour is P equipment, after the P equipment receives the FEC label mapping messages, therefrom parse
FEC and MT-ID, the FEC parsed and more topological path labels are carried on FEC label mapping messages and are sent to this equipment
LDP neighbours, and the FEC parsed and MT-ID are configured in local label forward table.Hereafter processing and aforementioned processing flow
It is similar, until FEC label mapping messages are forwarded to PE equipment.
It should be noted that in above-mentioned more topological path label notice procedures, not only carried in FEC label mapping messages
There are more topological path label MT-ID, also carry MPLS label（Label）.In MPLS network between each router not only according to
Above-mentioned flow notices MT-ID, furthermore, it would be desirable to carry out the replacement of MPLS label, the implementation that MPLS label is replaced belongs to existing
There is technology, will not be repeated here.
The form of FEC label mapping messages in above-mentioned flow can as shown in Fig. 2 including：Layer 2 data head, MPLS heads,
IP heads and message load（User data part i.e. in figure）.Wherein, MPLS heads are 32 bits, including following field：
Label field：20 bits, which part bit are used to carry more topological path labels（MT-ID）, remaining bit use
In carrying MPLS label（Label）；
Cos field：3 bits, calculated for marking the queuing being applied to when packet passes through network on packet and abandoning
Method；
S fields：1 bit, for identifying whether as stack bottom, show that MPLS label can be nested；
Ttl field：8 bits, for marking life span.
Cos field, S fields, ttl field and Label fields are existing field, and MT-ID fields are implemented for the present invention
The field of example definition.
In embodiments of the present invention, a high position for label field can be defined as to carrying MT-ID field, its low level is carrying
The field of Lable labels（As shown in Figure 2）, the low level of label field can also be defined as to carrying MT-ID field, it is high
Position is the field of carrying Lable labels.Position of the MT-ID fields in label field is not limited to both the above situation, as long as
A region defined in label field is used to carry MT-ID.
The length of MT-ID fields can be set according to the situation of MPLS network topology, can be by 2 ratios in label field
Special, 3 bits or 4 bit definitions are MT-ID fields.In order to ensure that it is most of that the more topological path label notice schemes of MPLS are applied to
MPLS network topology, it is preferred that at least 2 bits of label field are kept for into MT-ID.
Mode two：Downstream on Demand distributes
When PE equipment finds occur new destination-address in this equipment routing table, and the destination address be not belonging to it is any
During existing FEC, the PE equipment is that the destination address establishes a new FEC, and sends FEC tag requests to its LDP neighbour
Message, to ask to distribute label for newly-built FEC.
The equipment of FEC label request messages is received if P equipment, then the P equipment records the FEC label request messages,
According to local routing table find out to should FEC next-hop, continue to downstream LDP neighbours send FEC tag requests disappear
Breath.
After PE equipment receives FEC label request messages, if the PE equipment still has distributable label, and sentence
Fixed above-mentioned FEC label request messages are legal, then the PE equipment is FEC corresponding to FEC label request messages（I.e. newly-established FEC）
Label is distributed, the label includes more topological path label MT-ID labels and MPLS（Lable labels）.The PE equipment is by distribution
MT-ID is carried in FEC label mapping messages, is sent to the LDP neighbours of this equipment for sending the FEC label request messages,
And more topological path labels are configured in local label forward table.
The equipment of FEC label mapping messages is received if P equipment, then the P equipment solves from the FEC label mapping messages
More topological path labels are separated out, and judge whether once to receive the FEC label mapping messages of the newly-built FEC, if the P is set
Corresponding FEC label request messages are have recorded in standby database, then the P equipment carries the more topological path labels parsed
In FEC label mapping messages and it is sent to the upstream equipment of this equipment（That is the upstream LDP neighbours of this equipment）, and will parse
More topological path labels are configured in local label forward table.
After PE equipment receives FEC label mapping messages, from the specified area of the label field of the FEC label mapping messages
Domain parses more topological path labels, and the more topological path labels parsed are configured in local label forward table.Now,
LSP（Label Swiching Path, label switched path）Foundation complete, during LSP foundation, the LSP open up more
Flutterring path label, also notice is completed therewith, and each router on LSP can carry out the forwarding of user data according to Label Forwarding Information Base.
In the flow that above-mentioned Downstream on Demand distributes more topological path labels, the form and mode of FEC label mapping messages
The form of FEC label mapping messages in one is identical, will not be repeated here.
As can be seen that the embodiment of the present invention is used for by a region defined in the label field in FEC label mapping messages
MT-ID is carried, MT-ID labels is located at same field with Lable labels, and does not have nest relation, it is more topological so as to improve
The convenience of path label notice, without carrying out hardware modification to existing equipment, cost is saved.
Below in conjunction with Fig. 3 network architecture, the more topological path label sides of independently distribution of the embodiment of the present invention are described in detail
The more topological path label notice schemes of MPLS under formula.MPLS network as depicted includes：4 router R1, R2, R3,
R4, R1 and R3 are PE equipment, and R2 and R4 are P equipment.R1, R2, R3 form topological path 1, R1, and R4, R3 form topological path 2.
R1 establishes LDP neighborhoods with R2 and R4 respectively, and R2 establishes LDP neighborhoods with R1 and R3 respectively, and R3 is built with R2 and R4 respectively
Vertical LDP neighborhoods, R4 establish LDP neighborhoods with R1 and R3 respectively.
Two topological paths in the MPLS network be present：R1-R2-R3 and R1-R4-R3.
When occurring new route in the routing table that R3 has found oneself（A static routing has such as been newly increased, or has been received
To external routes）, it is found that address corresponding to the newly-increased route is not belonging to any existing FEC, then establish one newly for the address
FEC.R3 is respectively upstream router R2（Corresponding topological path R1-R2-R3）Distribute label（Including being worth the how topological road for 01
Footpath label and lable labels）, it is upstream router R4（Corresponding topological path R1-R4-R3）Distribute label（It is 10 including value
More topological path labels and lable labels）, and the FEC, more topological path labels 01 and corresponding lable labels are matched somebody with somebody
Put in local label forward table, and, the FEC, more topological path labels 10 and corresponding lable labels are configured to local
In Label Forwarding Information Base.
The lable labels and the FEC of more topological path labels 01 and distribution are carried on FEC label mapping messages by R3
L32, it is advertised to its LDP neighbours R2；The lable labels and the FEC of more topological path labels 10 and distribution are carried on FEC by R3
Label mapping message L34, it is advertised to its LDP neighbours R4.Wherein, FEC label mapping messages L32 and L34 form is as previously described.
After R2 receives the FEC label mapping messages L32 of R3 transmissions, parsed from FEC label mapping messages L32 more topological
Path label（It is worth for 01）, lable labels and FEC, and configured being worth for 01 more topological path labels, lable labels and FEC
Into R2 Label Forwarding Information Base.R2 will be worth more the topological path labels and FEC that are 01, and the lable labels of oneself distribution are taken
Band is sent to its LDP neighbours R1 in FEC label mapping messages L21.
After R4 receives the FEC label mapping messages L34 of R3 transmissions, parsed from FEC label mapping messages L34 more topological
Path label（It is worth for 10）, lable labels and FEC, and configured being worth for 10 more topological path labels, lable labels and FEC
Into R4 Label Forwarding Information Base.R4 will be worth more the topological path labels and FEC that are 10, and the lable labels of oneself distribution are taken
Band is sent to its LDP neighbours R1 in FEC label mapping messages L41.
R1 receives the FEC label mapping message L21 that R2 and R4 is sent, and parses topology more from FEC label mapping messages
Path label（It is worth for 01）, lable labels and FEC；And R1 receives the FEC label mapping message L41 that R4 is sent, and from FEC
Label mapping message parses more topological path labels（It is worth for 10）, lable labels and FEC.R1 selects according to route next jump
Label forwarding path, if R2 is R1 route next jump, R1 will be worth the more topological path labels, lable labels and the FEC that are 01
It is configured in R1 Label Forwarding Information Base.
After realizing the notice of more topological path labels by such scheme, router R1, R2, R3 can according to Label Forwarding Information Base,
The user data for belonging to same FEC is forwarded to the CE equipment.
The above embodiment of the present invention, more topological path labels are distributed by the edge device in MPLS network, and safeguard this
Ground Label Forwarding Information Base, and more topological path labels are carried on to the designated area of the label field of FEC label mapping messages, notice
To the LDP neighbours of this equipment, and, after more topological path labels are parsed from the FEC label mapping messages received, safeguard
Local label forward table, the processing that MPLS network equipment is noticed more topological path labels is simplified, improves more topological paths
The convenience of label notice；The embodiment of the present invention can utilize the existing network equipment to realize, without entering to conventional network equipment
Row hardware modification, it is cost-effective.
Based on identical technical concept, the embodiment of the present invention additionally provides a kind of edge device, and structure is as shown in figure 4, bag
Include：
Label distribute module 41, for distributing more topological path labels for forwarding equivalence class FEC.
Label Forwarding Information Base maintenance module 42, for more topological path labels that label distribute module 41 is FEC distribution to be matched somebody with somebody
Put in local label forward table；And after the FEC label mapping messages of LDP neighbor advertisements of this equipment are received, from institute
The designated area for stating the label field of FEC label mapping messages parses more topological path labels, and is opened up according to what is parsed more
Flutter path label configuration local label forward table.
Label announcement module 43, for more topological path labels that label distribute module 41 is FEC distribution to be carried on into FEC
The designated area of the label field of label mapping message, it is advertised to the tag distribution protocol LDP neighbours of this equipment.
The designated area is a high position for the label field of FEC label mapping messages.
The length of the designated area is at least 2 bits.
Based on identical technical concept, the embodiment of the present invention additionally provides a kind of P equipment, applied to MPLS network, P equipment
Structure as shown in figure 5, including：
Receiving module 51, for receiving the FEC label mapping messages of its LDP neighbour transmission；
Label Forwarding Information Base maintenance module 52, for the label word of the FEC label mapping messages received from receiving module 51
The designated area of section parses more topological path labels, and the more topological path labels parsed are configured into local label forwarding
In table；
Forwarding module 53, more topological path labels for Label Forwarding Information Base maintenance module 52 to be parsed are carried on FEC
The designated area of the label field of label mapping message, it is sent to the LDP neighbours of this equipment.
The designated area is a high position for the label field of FEC label mapping messages.
The length of the designated area is at least 2 bits.
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 station terminal equipment（Can be mobile phone, personal computer, server, or network equipment etc.）Perform sheet
Invent the method described in each embodiment.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
Depending on protection scope of the present invention.
Claims (12)
- A kind of 1. more topological path label notifying methods of multiprotocol label switching MPLS, applied to MPLS network, it is characterised in that Including：After edge device in MPLS network distributes more topological path labels for forwarding equivalence class FEC, by more topological paths Label is configured in local label forward table, and more topological path labels are carried on to the label of FEC label mapping messages The designated area of field, it is advertised to the tag distribution protocol LDP neighbours of this equipment；After the edge device receives the FEC label mapping messages of its LDP neighbor advertisement, from the FEC label mapping messages The designated area of label field parse more topological path labels, and configured according to the more topological path labels parsed local Label Forwarding Information Base；Wherein, the topological path in described more topological path tags unique identifier MPLS networks；Wherein, the FEC label mapping messages also carry MPLS label, and MPLS network is realizing more topological path labels While notice, the replacement of MPLS label is carried out.
- 2. the method as described in claim 1, it is characterised in that the designated area is the label word of FEC label mapping messages A high position for section.
- 3. the method as described in claim 1, it is characterised in that the length of the designated area is at least 2 bits.
- A kind of 4. more topological path label notifying methods of multiprotocol label switching MPLS, applied to MPLS network, it is characterised in that Including：After provider's P equipment in MPLS network receives the FEC label mapping messages of its LDP neighbour transmission, marked from the FEC The designated area for signing the label field of mapping message parses more topological path labels；The more topological path labels parsed are carried on the specified area of the label field of FEC label mapping messages by the P equipment Domain is sent to the LDP neighbours of this equipment, and the more topological path labels parsed are configured in local label forward table；Wherein, the topological path in described more topological path tags unique identifier MPLS networks；Wherein, the FEC label mapping messages also carry MPLS label, and MPLS network is realizing more topological path labels While notice, the replacement of MPLS label is carried out.
- 5. method as claimed in claim 4, it is characterised in that the designated area is the label word of FEC label mapping messages A high position for section.
- 6. method as claimed in claim 4, it is characterised in that the length of the designated area is at least 2 bits.
- A kind of 7. edge device, applied to MPLS network, it is characterised in that including：Label distribute module, for distributing more topological path labels for forwarding equivalence class FEC；Label Forwarding Information Base maintenance module, for more topological path labels that the label distribute module is FEC distribution to be configured to In local label forward table；And after the FEC label mapping messages of LDP neighbor advertisements of this equipment are received, from described The designated area of the label field of FEC label mapping messages parses more topological path labels, and more topological according to what is parsed Path label configures local label forward table；Label announcement module, for more topological path labels that the label distribute module is FEC distribution to be carried on into FEC labels The designated area of the label field of mapping message, it is advertised to the tag distribution protocol LDP neighbours of this equipment；Wherein, the topological path in described more topological path tags unique identifier MPLS networks；Wherein, the FEC label mapping messages also carry MPLS label, and MPLS network is realizing more topological path label notices While, carry out the replacement of MPLS label.
- 8. edge device as claimed in claim 7, it is characterised in that the designated area is the mark of FEC label mapping messages A high position for section of signing.
- 9. edge device as claimed in claim 7, it is characterised in that the length of the designated area is at least 2 bits.
- A kind of 10. provider P equipment, applied to MPLS network, it is characterised in that including：Receiving module, for receiving the FEC label mapping messages of its LDP neighbour transmission；Label Forwarding Information Base maintenance module, for the label field of FEC label mapping messages that is received from the receiving module Designated area parses more topological path labels, and the more topological path labels parsed are configured into local label forward table In；Forwarding module, more topological path labels for the Label Forwarding Information Base maintenance module to be parsed are carried on FEC labels The designated area of the label field of mapping message, it is sent to the LDP neighbours of this equipment；Wherein, the topological path in described more topological path tags unique identifier MPLS networks；Wherein, the FEC label mapping messages also carry MPLS label, and MPLS network is realizing more topological path label notices While, carry out the replacement of MPLS label.
- 11. P equipment as claimed in claim 10, it is characterised in that the designated area is the label of FEC label mapping messages A high position for field.
- 12. P equipment as claimed in claim 10, it is characterised in that the length of the designated area is at least 2 bits.
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| CN103825818B (en) * | 2014-02-14 | 2018-07-31 | 新华三技术有限公司 | A kind of more topological network retransmission methods and device |
| CN105337863B (en) * | 2014-07-29 | 2018-10-26 | 杭州迪普科技股份有限公司 | A kind of label distribution method and device |
| CN104836799B (en) * | 2015-04-15 | 2018-04-06 | 新华三技术有限公司 | A kind of LDP session establishing methods and equipment |
| CN111464441A (en) * | 2019-01-21 | 2020-07-28 | 华为技术有限公司 | Communication method and device |
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| CN101243654A (en) * | 2005-08-08 | 2008-08-13 | 思科技术公司 | Method and apparatus for enabling routing of label switched data packets |
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