CN106789657A - A kind of message forwarding method and device - Google Patents
A kind of message forwarding method and device Download PDFInfo
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- CN106789657A CN106789657A CN201611203529.9A CN201611203529A CN106789657A CN 106789657 A CN106789657 A CN 106789657A CN 201611203529 A CN201611203529 A CN 201611203529A CN 106789657 A CN106789657 A CN 106789657A
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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
Abstract
The invention provides a kind of message forwarding method and device, PE is applied to, the device includes：Main Switching Module, the ether network packet to being received from user side interface carries out MPLS encapsulation, is to be sent to first line of a couplet port after the ether network packet adds private network VC labels, two layers of head of public network LSP label and public network successively；GRE modules, the MPLS messages encapsulated by MPLS are received from first line of a couplet port, after ejection two layers of head of public network and public network LSP label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, the MPLS messages that will be received are encapsulated as IP GRE messages, and send the IP GRE messages in physical port；Wherein, source IP address and purpose IP address when GRE is encapsulated in IP headings are determined according to the corresponding relation of default public network LSP label and IP address.The transmission in an ip network of MPLS data is realized using the present invention.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of message forwarding method and device.
Background technology
In multiprotocol label switching (MPLS, Multi-Protocol Label Switching) network, label is used
The passage of switching path (LSP, Label Switched Path) tag identifier indicates the forward-path of data.And in IP network
The forward-path for then carrying out mark data using IP address in network route.In actual applications, there are the data in MPLS network
Will be by the situation of IP network, then, the transmission in an ip network of MPLS data how is completed, as asking that needs now are solved
Topic.
The content of the invention
A kind of message forwarding method and device are the embodiment of the invention provides, MPLS data biography in an ip network is realized
It is defeated.
What technical scheme was specifically realized in：
A kind of apparatus for forwarding message, is applied to service provider edge devices PE, and the device includes：
Main Switching Module, the ether network packet to being received from user side interface carries out multiprotocol label switching MPLS envelopes
Dress, is that the ether network packet adds two layers of private network virtual link VC labels, public network label switching path LSP label and public network successively
First line of a couplet port is sent to after head；
Generic route encapsulation GRE modules, the MPLS messages encapsulated by MPLS are received from first line of a couplet port, in ejection public network two
After layer head and public network LSP label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, will receive
To MPLS messages be encapsulated as IP GRE messages, and send the IP GRE messages in physical port；Wherein, IP when GRE is encapsulated
Source IP address and purpose IP address in heading are determined according to the corresponding relation of default public network LSP label and IP address
's.
A kind of apparatus for forwarding message, is applied to service provider edge devices PE, and the device includes：
GRE modules, the IP GRE messages to being received from physical port carry out GRE decapsulations, ejection public network two layers of head, IP
Heading and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by the deblocking
IP GRE messages after dress are forwarded to first line of a couplet port；Wherein, increased public network LSP label is according to default when GRE is decapsulated
Public network LSP label determines with the corresponding relation of IP address in IP headings；
Main Switching Module, the message after GRE decapsulations is received from first line of a couplet port, removes private network VC labels, public network LSP mark
Sign and two layers of head of public network, be descapsulated into ether network packet and be sent to user side interface.
A kind of apparatus for forwarding message, is applied to service provider edge devices PE, and the device includes：
Main Switching Module, the ether network packet to being received from user side interface carries out multiprotocol label switching MPLS envelopes
Dress, is to be sent to the first side extension after the ether network packet adds private network VC labels, two layers of head of public network LSP label and public network successively
Port；
GRE modules, hang the MPLS messages that port reception is encapsulated by MPLS, in ejection two layers of head of public network and public affairs from the first side
After net LSP label, increase gre tunneling head, two layers of head of IP headings and public network, the MPLS that will be received successively on private network VC labels
Message is encapsulated as IP GRE messages, and hangs the port transmission IP GRE messages on the second side；Wherein, IP messages when GRE is encapsulated
Source IP address and purpose IP address in head are determined according to the corresponding relation of default public network LSP label and IP address；
Main Switching Module, after receiving the IP GRE messages from the second side extension port, according in the IP headings
Purpose IP address search route forwarding table, determine corresponding first line of a couplet port, and the IP GRE messages are forwarded into the first line of a couplet end
Mouthful.
A kind of apparatus for forwarding message, is applied to service provider edge devices PE, and the device includes：
Main Switching Module, receives IP GRE messages, and is forwarded to the second side and hang port from first line of a couplet port；
GRE modules, the IP GRE messages to being received from the second side extension port carry out GRE decapsulations, eject two layers of public network
Head, IP headings and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And will be described
IP GRE messages after decapsulation are forwarded to the first side and hang port；Wherein, increased public network LSP label is root when GRE is decapsulated
Determine according to the corresponding relation of IP address in default public network LSP label and IP headings；
Main Switching Module, the message after port receives GRE decapsulations is hung from the first side, removes private network VC labels, public network
Two layers of head of LSP label and public network, are descapsulated into ether network packet and are sent to user side interface.
A kind of message forwarding method, is applied to service provider edge devices PE, and the method includes：
Ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is the ether
Network packet is sent to first line of a couplet port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
The MPLS messages encapsulated by MPLS are received from first line of a couplet port, after ejection two layers of head of public network and public network LSP label,
Increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, the MPLS messages that will be received are encapsulated as IP
GRE messages, and send the IP GRE messages in physical port；Wherein, source IP address and mesh when GRE is encapsulated in IP headings
IP address be to be determined according to the corresponding relation of default public network LSP label and IP address.
A kind of message forwarding method, is applied to service provider edge devices PE, and the method includes：
IP GRE messages to being received from physical port carry out GRE decapsulations, two layers of head of ejection public network, IP headings and
Gre tunneling head, increases by two layers of head of public network LSP label and public network successively on private network VC labels；And by the IP after the decapsulation
GRE messages are forwarded to first line of a couplet port；Wherein, increased public network LSP label is according to default public network LSP mark when GRE is decapsulated
Sign and the corresponding relation determination of IP address in IP headings；
The message after GRE decapsulations is received from first line of a couplet port, removes private network VC labels, public network LSP label and public network two
Layer head, is descapsulated into ether network packet and is sent to user side interface.
A kind of message forwarding method, is applied to service provider edge devices PE, and the method includes：
Ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is the ether
Network packet is sent to the first side extension port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
The MPLS messages that port reception is encapsulated by MPLS are hung from the first side, in ejection two layers of head of public network and public network LSP mark
After label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, the MPLS messages envelope that will be received
It is IP GRE messages to fill, and hangs the port transmission IP GRE messages on the second side；Wherein, when GRE is encapsulated in IP headings
Source IP address and purpose IP address are determined according to the corresponding relation of default public network LSP label and IP address；
After receiving the IP GRE messages from the second side extension port, the purpose IP address in the IP headings are looked into
Route forwarding table is looked for, corresponding first line of a couplet port is determined, and the IP GRE messages are forwarded to the first line of a couplet port.
A kind of message forwarding method, is applied to service provider edge devices PE, and the method includes：
IP GRE messages are received from first line of a couplet port, and is forwarded to the second side and hang port；
IP GRE messages to being received from the second side extension port carry out GRE decapsulations, two layers of head of ejection public network, IP messages
Head and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by after the decapsulation
IP GRE messages be forwarded to first side hang port；Wherein, increased public network LSP label is according to default when GRE is decapsulated
Public network LSP label determines with the corresponding relation of IP address in IP headings；
The message after port receives GRE decapsulations is hung from the first side, removes private network VC labels, public network LSP label and public affairs
Two layers of head of net, are descapsulated into ether network packet and are sent to user side interface.
The message forwarding method and device of the embodiment of the present invention, set up an IP gre tunneling, by MPLS in IP network
Message carries out IP GRE encapsulation, in this way, MPLS messages can need not be just concerned about in IP network in transmission in the IP gre tunnelings
Routing forwarding processing procedure, it is achieved thereby that the transmission in an ip network of MPLS data.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is the structural representation of the apparatus for forwarding message of the embodiment of the present invention one.
Fig. 2 is the schematic flow sheet of the up direction message forwarding method of embodiment one.
Fig. 3 a are the structural representation (forwarding of message up direction is illustrated) of the apparatus for forwarding message of the embodiment of the present invention two.
Fig. 3 b are the structural representation (forwarding in message downlink direction is illustrated) of the apparatus for forwarding message of the embodiment of the present invention two.
Specific embodiment
To make the purpose of the present invention, technical scheme and advantage become more apparent, develop simultaneously embodiment referring to the drawings,
The present invention is described in more detail.
The present invention sets up an IP GRE (Generic Routing Encapsulation, general route in IP network
Encapsulation) tunnel, i.e. an IP gre tunneling is set up between local PE equipment and opposite end PE equipment.To MPLS in PE equipment
Message carries out IP GRE encapsulation, or IP GRE messages are decapsulated.Specifically, it is divided into two kinds of implementations, Yi Zhongshi
First line of a couplet type, increased GRE modules are located between the first line of a couplet port of main Switching Module and physical port in PE equipment.One kind is other extension
Type, increased GRE modules are located between two other extension ports of main Switching Module in PE equipment.Realized in GRE modules up
The GRE encapsulation of MPLS messages, and the GRE of downstream IP GRE messages is decapsulated.
Embodiment one (first line of a couplet type)
Fig. 1 is the structural representation of the apparatus for forwarding message of the embodiment of the present invention one.
GRE modules 102 are located between the first line of a couplet port of main Switching Module 101 and physical port.In existing structure, main friendship
The first line of a couplet port for changing the mold block 101 is directly connected with physical port, and the first line of a couplet port of main Switching Module 101 is first in the present invention
GRE modules 102 are connected to, GRE modules 102 are directly connected to physical port.
In up direction, main Switching Module 101, the ether network packet to being received from user side interface carries out multi-protocols mark
Sign and exchange (MPLS) encapsulation, be after the ether network packet adds private network VC labels, two layers of head of public network LSP label and public network successively
It is sent to first line of a couplet port；
GRE modules 102, the MPLS messages encapsulated by MPLS are received from first line of a couplet port, in ejection two layers of head of public network and public affairs
After net LSP label, increase gre tunneling head, two layers of head of IP headings and public network, the MPLS that will be received successively on private network VC labels
Message is encapsulated as IP GRE messages, and sends the IP GRE messages in physical port；Wherein, when GRE is encapsulated in IP headings
Source IP address and purpose IP address be to be determined according to the corresponding relation of default public network LSP label and IP address.
Wherein, two layers of head of public network are by taking Ethernet as an example, then including VLAN, source and destination MAC Address part) part.Private network
VC (Virtual Circuit, virtual link) label is used for opposite end PE equipment and receives after IP GRE messages according to the private network for carrying
VC labels forward the packet to the access link (AC, Attached Circuit) of VC bindings.Customer edge (CE,
Custom Edge) link and provider edge equipment (PE, Provider Edge) between is access link.IP heading bags
Include source IP address and purpose IP address etc..Two layers of increased gre tunneling head, IP headings and public network successively on private network VC labels
Head, is exactly the IP GRE heads of GRE encapsulation.
In down direction, GRE modules 102, the IP GRE messages to being received from physical port carry out GRE decapsulations, bullet
Go out two layers of head of public network, IP headings and gre tunneling head, increase by two layers of public network LSP label and public network successively on private network VC labels
Head；And the IP GRE messages after the decapsulation are forwarded to first line of a couplet port；Wherein, increased public network LSP mark when GRE is decapsulated
Label are determined according to the corresponding relation of IP address in default public network LSP label and IP headings；
Main Switching Module 101, the message after GRE decapsulations is received from first line of a couplet port, removes private network VC labels, public network
Two layers of head of LSP label and public network, are descapsulated into ether network packet and are sent to user side interface.
In the present invention, the corresponding relation of public network LSP label and IP address in IP headings is preset with PE equipment, also
It is to say, public network LSP label value is corresponded with the source and destination IP address of IP headings.So in up direction, GRE module energy
Public network LSP label is enough ejected, IP headings are replaced with according to corresponding relation；In down direction, GRE modules can eject IP messages
Head, public network LSP label is replaced with according to corresponding relation.
From the above, it is seen that main Switching Module 101 does not perceive the change of message format completely in the embodiment of the present invention, still
So like the prior art, ether network packet is encapsulated as MPLS messages in up direction and is transmitted, received in down direction
Message is carried out into MPLS decapsulations after to message.Therefore the embodiment of the present invention is realized to the completely compatible of existing device.
Based on identical inventive concept, the present invention proposes a kind of message forwarding method, is applied to Provider Edge and sets
Standby PE, its schematic flow sheet is as shown in Fig. 2 the method includes：
Step 21, the ether network packet to being received from user side interface carry out multiprotocol label switching MPLS encapsulation, are
The ether network packet is sent to first line of a couplet port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
Step 22, the MPLS messages encapsulated by MPLS from the reception of first line of a couplet port, in ejection two layers of head of public network and public network LSP
After label, increase gre tunneling head, two layers of head of IP headings and public network, the MPLS messages that will be received successively on private network VC labels
IP GRE messages are encapsulated as, and the IP GRE messages are sent in physical port；Wherein, source when GRE is encapsulated in IP headings
IP address and purpose IP address are determined according to the corresponding relation of default public network LSP label and IP address.
Based on identical inventive concept, the present invention also proposes a kind of message forwarding method, is applied to Provider Edge
Equipment PE, the method includes：
Step 31, the IP GRE messages to being received from physical port carry out GRE decapsulations, ejection public network two layers of head, IP
Heading and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by the deblocking
IP GRE messages after dress are forwarded to first line of a couplet port；Wherein, increased public network LSP label is according to default when GRE is decapsulated
Public network LSP label determines with the corresponding relation of IP address in IP headings；
Step 32, received from the first line of a couplet port GRE decapsulation after message, remove private network VC labels, public network LSP label and
Two layers of head of public network, are descapsulated into ether network packet and are sent to user side interface.
Embodiment two (other hung type)
Fig. 3 a and Fig. 3 b are the structural representation of the apparatus for forwarding message of the embodiment of the present invention two.Fig. 3 a are message up direction
Forwarding schematic diagram.Fig. 3 b are the forwarding schematic diagram in message downlink direction.
GRE modules are located at the other of main Switching Module and hang on port.Existing typical case's application that side hangs port includes operation dimension
Pillar reason (OAM), service quality (QOS) etc..
In up direction, main Switching Module 101, the ether network packet to being received from user side interface carries out multi-protocols mark
Sign and exchange MPLS encapsulation, be to be sent out after the ether network packet adds private network VC labels, two layers of head of public network LSP label and public network successively
It is sent to the first side and hangs port；
GRE modules 102, hang the MPLS messages that port reception is encapsulated by MPLS, in ejection two layers of head of public network from the first side
After public network LSP label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, by what is received
MPLS messages are encapsulated as IP GRE messages, and hang the port transmission IP GRE messages on the second side；Wherein, IP when GRE is encapsulated
Source IP address and purpose IP address in heading are determined according to the corresponding relation of default public network LSP label and IP address
's；
Main Switching Module 101, after receiving the IP GRE messages from the second side extension port, according in the IP headings
Purpose IP address search route forwarding table, determine corresponding first line of a couplet port, and the IP GRE messages are forwarded to the first line of a couplet
Port.
In down direction, main Switching Module 101 receives IP GRE messages, and is forwarded to the second side and hangs end from first line of a couplet port
Mouthful；
GRE modules 102, the IP GRE messages to being received from the second side extension port carry out GRE decapsulations, eject public network two
Layer head, IP headings and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by institute
State the IP GRE messages after decapsulation and be forwarded to the first side extension port；Wherein, increased public network LSP label is when GRE is decapsulated
What the corresponding relation according to IP address in default public network LSP label and IP headings determined；
Main Switching Module 101, the message after port receives GRE decapsulations is hung from the first side, removes private network VC labels, public affairs
Two layers of head of net LSP label and public network, are descapsulated into ether network packet and are sent to user side interface.
In the present invention, the corresponding relation of public network LSP label and IP address in IP headings is preset with PE equipment, also
It is to say, public network LSP label value is corresponded with the source and destination IP address of IP headings.So in up direction, GRE module energy
Public network LSP label is enough ejected, IP headings are replaced with according to corresponding relation；In down direction, GRE modules can eject IP messages
Head, public network LSP label is replaced with according to corresponding relation.
According to the apparatus structure in embodiment two, because GRE modules are arranged on, the first side hangs port and the second side hangs port
Between, so message is no longer as in embodiment one, enter from user side interface, gone out from first line of a couplet port.In other hung type knot
In structure, main Switching Module is in up direction, it is necessary to increase routing forwarding presentation, data are hung into port by side is forwarded to first line of a couplet end
Mouthful；And in down direction, according to pre-defined rule, data are forwarded to other extension port by first line of a couplet port.But MPLS messages turn
Hair pattern does not change, and realizes basic function and structure compatible.
Based on identical inventive concept, the present invention proposes a kind of message forwarding method, is applied to Provider Edge and sets
Standby PE, the method includes：
Step 41, the ether network packet to being received from user side interface carry out multiprotocol label switching MPLS encapsulation, are
The ether network packet is sent to the first side extension port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
Step 42, the MPLS messages encapsulated by MPLS from the first side extension port reception, in ejection two layers of head of public network and public affairs
After net LSP label, increase gre tunneling head, two layers of head of IP headings and public network, the MPLS that will be received successively on private network VC labels
Message is encapsulated as IP GRE messages, and hangs the port transmission IP GRE messages on the second side；Wherein, IP messages when GRE is encapsulated
Source IP address and purpose IP address in head are determined according to the corresponding relation of default public network LSP label and IP address；
Step 43, hung after port receives the IP GRE messages from the second side, according to the purpose in the IP headings
IP address searches route forwarding table, determines corresponding first line of a couplet port, and the IP GRE messages are forwarded into the first line of a couplet port.
Based on identical inventive concept, the present invention also proposes a kind of message forwarding method, is applied to Provider Edge
Equipment PE, the method includes：
Step 51, from first line of a couplet port receive IP GRE messages, and be forwarded to second side hang port；
Step 52, the IP GRE messages to being received from the second side extension port carry out GRE decapsulations, eject two layers of public network
Head, IP headings and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And will be described
IP GRE messages after decapsulation are forwarded to the first side and hang port；Wherein, increased public network LSP label is root when GRE is decapsulated
Determine according to the corresponding relation of IP address in default public network LSP label and IP headings；
Step 53, from first side hang port receive GRE decapsulation after message, remove private network VC labels, public network LSP mark
Sign and two layers of head of public network, be descapsulated into ether network packet and be sent to user side interface.
In sum, the message forwarding method and device of the embodiment of the present invention one and embodiment two, the existing PTN/ of compatibility
IPRAN equipment, by way of public network LSP label and IP GRE heads are exchanged, realizes MPLS data in an ip network saturating
Bright transmission, avoids changing existing hardware, software configuration, reduces cost as far as possible.In addition, it is necessary to explanation, due to up direction
Message length becomes big, and bandwidth accordingly increases, therefore by uplink message storage internally or in external cache, to realize burst number
According to traffic shaping, it is to avoid produce a large amount of packet losses because bandwidth is not enough.Lead to when bandwidth is continuously maintained in line speed simultaneously
Transmitted traffic control message is crossed to avoid cache overflow and packet loss phenomenon.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (8)
1. a kind of apparatus for forwarding message, is applied to service provider edge devices PE, it is characterised in that the device includes：
Main Switching Module, the ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is
After the ether network packet adds private network virtual link VC labels, two layers of head of public network label switching path LSP label and public network successively
It is sent to first line of a couplet port；
Generic route encapsulation GRE modules, the MPLS messages encapsulated by MPLS are received from first line of a couplet port, in ejection two layers of head of public network
After public network LSP label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, by what is received
MPLS messages are encapsulated as IP GRE messages, and send the IP GRE messages in physical port；Wherein, IP messages when GRE is encapsulated
Source IP address and purpose IP address in head are determined according to the corresponding relation of default public network LSP label and IP address.
2. a kind of apparatus for forwarding message, is applied to service provider edge devices PE, it is characterised in that the device includes：
GRE modules, the IP GRE messages to being received from physical port carry out GRE decapsulations, two layers of head of ejection public network, IP messages
Head and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by after the decapsulation
IP GRE messages be forwarded to first line of a couplet port；Wherein, increased public network LSP label is according to default public network when GRE is decapsulated
LSP label determines with the corresponding relation of IP address in IP headings；
Main Switching Module, from first line of a couplet port receive GRE decapsulation after message, remove private network VC labels, public network LSP label and
Two layers of head of public network, are descapsulated into ether network packet and are sent to user side interface.
3. a kind of apparatus for forwarding message, is applied to service provider edge devices PE, it is characterised in that the device includes：
Main Switching Module, the ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is
The ether network packet is sent to the first side extension port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
GRE modules, hang the MPLS messages that port reception is encapsulated by MPLS, in ejection two layers of head of public network and public network from the first side
After LSP label, increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, the MPLS reports that will be received
Text is encapsulated as IP GRE messages, and hangs the port transmission IP GRE messages on the second side；Wherein, IP headings when GRE is encapsulated
In source IP address and purpose IP address be to be determined according to the corresponding relation of default public network LSP label and IP address；
Main Switching Module, after receiving the IP GRE messages from the second side extension port, according to the purpose in the IP headings
IP address searches route forwarding table, determines corresponding first line of a couplet port, and the IP GRE messages are forwarded into the first line of a couplet port.
4. a kind of apparatus for forwarding message, is applied to service provider edge devices PE, it is characterised in that the device includes：
Main Switching Module, receives IP GRE messages, and is forwarded to the second side and hang port from first line of a couplet port；
GRE modules, the IP GRE messages to being received from the second side extension port carry out GRE decapsulations, ejection public network two layers of head, IP
Heading and gre tunneling head, increase by two layers of head of public network LSP label and public network successively on private network VC labels；And by the deblocking
IP GRE messages after dress are forwarded to the first side and hang port；Wherein, increased public network LSP label is according to pre- when GRE is decapsulated
If public network LSP label and IP headings in the corresponding relation of IP address determine；
Main Switching Module, the message after port receives GRE decapsulations is hung from the first side, removes private network VC labels, public network LSP mark
Sign and two layers of head of public network, be descapsulated into ether network packet and be sent to user side interface.
5. a kind of message forwarding method, is applied to service provider edge devices PE, it is characterised in that the method includes：
Ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is the Ethernet report
Text is sent to first line of a couplet port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
The MPLS messages encapsulated by MPLS are received from first line of a couplet port, after ejection two layers of head of public network and public network LSP label, in private
Increase gre tunneling head, two layers of head of IP headings and public network successively on net VC labels, the MPLS messages that will be received are encapsulated as IP GRE
Message, and send the IP GRE messages in physical port；Wherein, source IP address and purpose when GRE is encapsulated in IP headings
IP address is determined according to the corresponding relation of default public network LSP label and IP address.
6. a kind of message forwarding method, is applied to service provider edge devices PE, it is characterised in that the method includes：
IP GRE messages to being received from physical port carry out GRE decapsulations, two layers of head of ejection public network, IP headings and GRE
Tunnel head, increases by two layers of head of public network LSP label and public network successively on private network VC labels；And by the IP GRE after the decapsulation
Message is forwarded to first line of a couplet port；Wherein, GRE decapsulate when increased public network LSP label be according to default public network LSP label with
The corresponding relation of IP address determines in IP headings；
The message after GRE decapsulations is received from first line of a couplet port, removes private network VC labels, two layers of head of public network LSP label and public network,
It is descapsulated into ether network packet and is sent to user side interface.
7. a kind of message forwarding method, is applied to service provider edge devices PE, it is characterised in that the method includes：
Ether network packet to being received from user side interface carries out multiprotocol label switching MPLS encapsulation, is the Ethernet report
Text is sent to the first side extension port after adding private network VC labels, two layers of head of public network LSP label and public network successively；
The MPLS messages that port reception is encapsulated by MPLS are hung from the first side, after ejection two layers of head of public network and public network LSP label,
Increase gre tunneling head, two layers of head of IP headings and public network successively on private network VC labels, the MPLS messages that will be received are encapsulated as IP
GRE messages, and hang the port transmission IP GRE messages on the second side；Wherein, source IP address when GRE is encapsulated in IP headings
With purpose IP address determined according to the corresponding relation of default public network LSP label and IP address；
After receiving the IP GRE messages from the second side extension port, the purpose IP address in the IP headings search road
By forward table, corresponding first line of a couplet port is determined, and the IP GRE messages are forwarded to the first line of a couplet port.
8. a kind of message forwarding method, is applied to service provider edge devices PE, it is characterised in that the method includes：
IP GRE messages are received from first line of a couplet port, and is forwarded to the second side and hang port；
Carry out GRE decapsulations to hanging the IP GRE messages that receive of port from the second side, two layers of head of ejection public network, IP headings and
Gre tunneling head, increases by two layers of head of public network LSP label and public network successively on private network VC labels；And by the IP after the decapsulation
GRE messages are forwarded to the first side and hang port；Wherein, increased public network LSP label is according to default public network when GRE is decapsulated
LSP label determines with the corresponding relation of IP address in IP headings；
The message after port receives GRE decapsulations is hung from the first side, removes private network VC labels, public network LSP label and public network two
Layer head, is descapsulated into ether network packet and is sent to user side interface.
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