CN100387019C - Method for realizing cross-mixed network multi-protocol tag exchange virtual special network - Google Patents
Method for realizing cross-mixed network multi-protocol tag exchange virtual special network Download PDFInfo
- Publication number
- CN100387019C CN100387019C CNB2005100631090A CN200510063109A CN100387019C CN 100387019 C CN100387019 C CN 100387019C CN B2005100631090 A CNB2005100631090 A CN B2005100631090A CN 200510063109 A CN200510063109 A CN 200510063109A CN 100387019 C CN100387019 C CN 100387019C
- Authority
- CN
- China
- Prior art keywords
- route
- network
- edge device
- vpn
- advertising
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
-
- 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
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
-
- 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
-
- 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]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/167—Adaptation for transition between two IP versions, e.g. between IPv4 and IPv6
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention relates to a method for realizing a virtual special network for multi-protocol label exchange across hybrid networks. The method mainly comprises the steps that firstly, an autonomous system the virtual special network for multi-protocol label exchange edge device and a provider edge device are respectively provided with an IPv4 and IPv6 protocol stack; hosts of user networks carry out routing notification of the virtual special network through edge devices which are respectively provided with the IPv4 and IPv6 protocol stack; after the routing notification is completed, the host of the user networks transfers service flows according to obtained routing information. In the transient process from an IPv4 network to an IPv6 network, when occurrence that an MPLS backbone network provides an IPv4/IPv6 hybrid network for multiple providers arises and a VPN user network can be the IPv4/IPv6 hybrid network, a corresponding realization scheme of BGP/MPLS VPN can be provided. The method has the advantages of simple realization and favorable communication performance.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the BGP/MPLS VPN implementation method of a kind of IPv4 of leap and IPv6 hybrid network.
Background technology
BGP (Border Gateway Protocol)/MPLS VPN (MPLS VPN) a kind ofly combines bgp protocol with the MPLS technology, be used to provide the VPN three-layer VPN technology of service.Carry the VPN route of label with the multi-protocols extended attribute in the bgp protocol, in expansion community attribute, carry the property value of the specific VPN of sign, carry out the announcement of VPN route; According to the VPN route vpn service stream is carried out encapsulate forwarded by MPLS again,, provide VPN service with this isolation and transmission that realizes VPN route and Business Stream.
At present, in relevant draft draft-ietf-ppvpn-rfc2547 bis-04, at the MPLS backbone network is that the IPv4 network of striding a plurality of autonomous systems has proposed a kind of implementation, and this scheme is to be that main method realizes to transmit the VPN route at the border router of each autonomous system.
The specific implementation of such scheme as shown in Figure 1, all-network is the IPv4 network among Fig. 1, wherein the MPLS backbone network is made up of two autonomous systems of AS100, AS200.The implementation procedure of BGP/MPLS VPN is divided into the transmission of control flows and the forwarding of Business Stream: the transmission of control flows mainly is meant the VPN route learning between the VPN website, and the forwarding of Business Stream is meant the traffic communications between the VPN website.
To be communicated to VPN website 3 (being SITE3) with VPN route 100.0.0.0/8 in the website 1 (being SITE1) below, it is that the Business Stream of 100.0.0.1 is an example that website 3 sends destination address to website 1, and the detailed process that the transmission and the Business Stream of control flows in this scheme are transmitted describes.
Referring to Fig. 1, described control flows transmittance process is as follows:
CE1 is with the IPv4 VPN route 100.0.0.0/8 in the VPN A website 1, be communicated to PE1 (provider's edge device 1) by EBGP (External BGP), IGP (Interior Gateway Protocol) or static routing, PE1 is this VPN route assignment label, and writes among the VRF A (virtual routing forwarding A) of PE1;
Dispose MP-IBGP (multi-protocols-Internal BGP) between PE1 and ASBR1 (Autonomous System Boundary Router, AS Boundary Router 1), PE1 together with label, announces the VPN route 100.0.0.0/8 among the VRF A to ASBR1 by bgp session;
Between ASBR1 and ASBR2, dispose MP-EBGP (multi-protocols-External BGP), ASBR1 receives this VPN route, for it redistributes label, by and ASBR2 between bgp session, VPN route 100.0.0.0/8 with new label is announced to ASBR2, and the label exchange message is write LFIB (label forwarding information table);
ASBR2 receives VPN route 100.0.0.0/8, for it redistributes label, disposes MP-IBGP between ASBR2 and the PE2, to the PE2 announcement VPN route with new label, and the label exchange message is write the label forwarding information table by bgp session ASBR2;
PE2 according to route target community, writes the VPN route 100.0.0.0/8 that receives among the VRF A, by between PE2 and CE3 (customer edge), disposing IGP, EBGP or static routing, with this VPN advertising of route to CE3.
Still referring to Fig. 1, the processing procedure of the forwarding of described Business Stream is as follows:
According to the routing table of CE3, destination address is that the vpn service stream of 100.0.0.1 is forwarded to PE2 in the website 3;
PE2 is according to the interface corresponding with CE3, the prefix route of searching destination address 100.0.0.1 among the VRF A, can find route 100.0.0.0/8 with and corresponding label information, therefore, PE2 is encapsulated as the MPLS bag with this IP operation stream, is transmitted to ASBR2;
ASBR2 receives this vpn service stream that is encapsulated as the MPLS bag, according to information in the label forwarding information table, for this MPLS packet switch label, is transmitted to ASBR1;
ASBR1 for this vpn service stream switch label, is transmitted to PE1 equally according to information in the label forwarding information table;
PE1 according to the stack that receives MPLS bag at the bottom of label, CE1 is issued in the vpn service circulation that is reduced to the IP packet, be transmitted to the corresponding target main frame by CE1.
As can be seen, such scheme has solved the realization of the cross-domain BGP/MPLS VPN of IPv4 network, but such scheme and be not suitable for the MPLS backbone network and the VPN user site is the situation of IPv4/v6 hybrid network.
Based on IPv4 and IPv6 hybrid network, also proposed to utilize NAT-PT (network address translation-protocol conversion) technology to realize the scheme that main frame in the pure IPv6 network and the main frame in the pure IPv4 network communicate in RFC2766, corresponding network configuration and domain name mapping process are as shown in Figure 2.
In Fig. 2, network 1 is the IPv6 network, and network 2 is the IPv4 network.NAT-PT is network address translation-protocol converter, is used to finish IP bag, ICMP (Internet Control Message Protocol) wraps in the conversion between IPv4/v6; DNS-ALG is the DSN ALG, is used to realize the conversion of DNS request response message IPv4/v6, and the detection of IP address in the upper strata message of encapsulation in the IP bag.
The IPv6 host A that short dash line is depicted as in the network 1 among Fig. 2 is initiated the domain name mapping process that the IPv4 host B in network 2 is communicated by letter, and the IPv4 host B that long dotted line is depicted as in the network 2 is initiated the domain name mapping process that the IPv6 host A in network 1 is communicated by letter.
When the communication of IPv6 host A initiation to the IPv4 host B, at first host A sends IPv6DNS (" AAAA ") request to NAT-PT, NAT-PT receives this request, by DNS-ALG this request is converted to IPv4 DNS (" A ") request, mails to the IPv4 dns server of network 2; NAT-PT is returned in the IPv4 address that the dns server of network 2 will be resolved back, is added the particular address prefix and returned host A before this address by NAT-PT; The host A address architecture IPv6 packet that returns; This packet uses the IPv4 address of removing prefix as destination address because the particular prefix of destination address is routed to NAT-PT at NAT-PT, and changing this IPv6 packet is the IPv4 packet, mails to host B.
When the communication of IPv4 host B initiation to the IPv6 host A, at first host B sends IPv4 to NAT-PT
DNS (" A ") request, DNS-ALG is converted to IPv6 DNS (" AAAA ") request with this request, mail to the IPv6 dns server in the network 1, the IPv6 address that dns server in the network 1 will be resolved back returns to NAT-PT, and NAT-PT selects an IPv4 address and returns to host B from this locality has the IPv4 address pool of particular address prefix; Host B is constructed the IPv4 packet with this return address, this packet is routed to NAT-PT, finding the IPv6 address corresponding with this packet rs destination address by NAT-PT, is purpose IPv6 address with this address, this IPv4 packet is converted to the IPv6 packet mails to host A.
Be not difficult to find out that the technical scheme that realizes based on NAT-PT only can provide the intercommunication between foreign peoples's web site in next-door neighbour's IPv4 network and the IPv6 network, does not but propose concrete solution for the situation of crossing over a plurality of territories between foreign peoples's web site of intercommunication.
At present, it is the single autonomous system of IPv4 or IPv6 that backbone network then is provided in draft-ietf-I3vpn-bgp-ipv6-02, and the VPN user site is the BGP/MPLS vpn solution under the IPv6 network, and corresponding network topology as shown in Figure 3.
In Fig. 3, VPN A website 1, VPN B website 2 insert PE1, and VPN A website 3, VPN B website 4 insert PE2; All VPN user site are the IPv6 network, and the MPLS backbone network is the IPv4 network.Below will be with the VPN route 3ffe:3240: of website 1 :/32 be communicated to website 3, and it is that the vpn service stream of 3ffe:3240::1 is example that website 3 sends destination address to website 1, and this technical scheme is described.
Referring to Fig. 3, the transmittance process of control corresponding stream is specific as follows:
CE1 is by method VPN route 3ffe:3240: in PE1 distribution site 1 such as static routing, EBGP, IGP :/32;
PE1 receives this route, it is write among the IPv6 VRF A of VPN A correspondence, and be this route assignment label;
PE1 gives PE2 by MP-IBGP with the IPv6 advertising of route of this tape label, in the BGP message of announcement VPN route, reached at the information that multi-protocols can reach in the attribute is IPv6 VPN route 3ffe:3240: :/32, and next hop field is the IPv6 VPN address of the IPv4 map addresses of PE1;
PE2 receives this route, it is added among the IPv6 VRF A of VPN A correspondence, next jumps the IPv6 VPN address for the IPv4 map addresses of PE1, and issues this route by methods such as static routing, IGP, EBGP to CE3, and spreads this route by CE3 in present networks.
Still referring to Fig. 3, the repeating process of described Business Stream is specific as follows:
Website 3 is that the IPv6 packet of 3ffe:3240::1 is sent to CE2 with destination address;
CE2 searches local routing table, and the IPv6 packet is forwarded to PE2;
The VRF that PE2 inquiry and VPN website 3 are corresponding, for this IPv6 packet is pressed into the secondary label, label is that PE1 is the IPv6 VPN3ffe:3240: of website 1 at the bottom of the stack: the label of/32 route assignment, stack top label are the IPv4 LSP label of PE2 to PE1;
Through the LSP of PE2 to PE1, this MPLS message is forwarded to PE1;
PE1 according to stack at the bottom of label the MPLS message is reduced to the IPv6 packet, be forwarded to the destination host of website 1.
In this technical scheme, having solved backbone network respectively is the single autonomous system of IPv4 or IPv6, the VPN user site is a communication issue between the VPN website under the IPv6 network, but for BGP/MPLS VPN backbone network is the IPv4/v6 hybrid network of striding a plurality of autonomous systems, and the VPN user site does not but propose concrete solution for the situation of IPv4/v6 hybrid network yet.
In sum, for crossing over the IPv4/v6 hybrid network of a plurality of autonomous systems, the VPN user site also is the situation of IPv4/v6 hybrid network, does not also provide concrete solution to realize corresponding BGP/MPLS VPN at present for the MPLS backbone network.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the implementation method that the purpose of this invention is to provide a kind of MPLS VPN of cross-mixed network, to solve the MPLS backbone network is the IPv4/v6 hybrid network of crossing over a plurality of autonomous systems, and the VPN user site is the problem for communicating by letter between website among the BGP/MPLS VPN under the situation of IPv4/v6 hybrid network also.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of implementation method of MPLS VPN of cross-mixed network, comprising:
A, at the autonomous system edge device of MPLS VPN, and configuration of IP v4 and IPv6 protocol stack respectively on provider's edge device;
Main frame between B, user network carries out the announcement of Virtual Private Network route by the edge device that disposes IPv4 and IPv6 protocol stack, and described announcement process is: user network sends advertising of route message to autonomous system, after provider's edge device and autonomous system edge device are received corresponding advertising of route message, determine the IP address information that it adopts according to the IP protocol version information that user network is used, based on described definite IP address information, realize advertising of route by autonomous system between user network;
C, finish advertising of route after, main frame between user network carries out the transmission of Business Stream according to the routing iinformation that obtains.
Described step B specifically comprises:
B1, user network send advertising of route message by its edge device to provider's edge device;
After B2, provider's edge device are received described advertising of route message, be this route assignment label, and determine the IP address information that self adopts, then this route is sent to the autonomous system edge device;
After B3, autonomous system edge device are received described advertising of route message, continue as this route assignment label, and determine the IP address information that self adopts, transmit described advertising of route message successively backward, up to arriving the opposite end user network.
Described step B1 comprises:
Interior Gateway Protocol IGP, External BGP EBGP or the static routing of user network by disposing between itself and provider's edge device given provider's edge device with the virtual private network advertising of route in the user network.
Described step B2 also comprises:
After provider's edge device is received described advertising of route message, the VPN route is write among the local virtual routing forwarding VRF, and determine the IP address information that self adopts according to the IP protocol version information that user network is used;
Provider's edge device sends to the autonomous system edge device with described advertising of route message and the label redistributed and its IP address information based on multi-protocols Internal BGP MP-IBGP.
Described step B3 also comprises:
After the autonomous system edge device is received described advertising of route message, label and the provider's edge device distributed labels of redistributing write the label forwarding information table;
With described advertising of route message, and in this locality distributed labels and information of self IP address send to the edge device of adjacent autonomous system based on multi-protocols External BGP EBGP once more.
Described step B3 also comprises:
B31, successively in the territory of autonomous system and carry out the transmission of advertising of route message between the territory, arrive the provider's edge device that is connected with the opposite end user network until described advertising of route message;
B32, provider's edge device send to the user network boundary device of opposite end user network with described advertising of route message based on IGP, EBGP or static routing, and spread described advertising of route message in this locality by it.
Described step B also comprises:
When next jumping loop-back address is different with the tab indexes corresponding address information version of local terminal in the advertising of route message of receiving as the provider's edge device or the autonomous system edge device of autonomous system outlet edge equipment, then loop-back address is converted to the identical address of version with tab indexes corresponding address information, then, search the label information of determining correspondence according to the loop-back address after the conversion.
Described step C specifically comprises:
After finishing advertising of route, the user network that receives advertising of route sends Business Stream according to the routing iinformation of the user network that sends advertising of route to it;
After described Business Stream arrived autonomous system, provider's edge device and autonomous system edge device sent to the relative users network according to address information and the label information preserved with described Business Stream.
As seen from the above technical solution provided by the invention, realization of the present invention makes at the IPv4 network in IPv6 network transition process, form for IPv4 and IPv6 hybrid network that how tame operator provides when the MPLS backbone network occurring, when the VPN user network also is the situation of IPv4/v6 hybrid network, can provide the implementation of corresponding BGP/MPLS VPN.
And, the invention provides based on IPv4 and IPv6 hybrid network, stride among the BGP/MPLS VPN of multi self-governing system between similar web site realization of Communication scheme between communication and foreign peoples's web site, and corresponding implementation has and realizes simple, the good advantage of communication performance.
Description of drawings
Fig. 1 utilizes border router to transmit the BGP/MPLS VPN of VPN route;
The network of Fig. 2 for communicating by letter between the IPv4 that realizes based on NAT-PT and IPv6 network host;
Fig. 3 is the BGP/MPLS VPN based on IPv6 VPN user;
Fig. 4 is the BGP/MPLS VPN of IPv4 among the present invention and the similar website of IPv6 mixed network structure;
Fig. 5 is the process schematic diagram that PE1 announces the VPN route among Fig. 4 to PE2;
Fig. 6 is the BGP/MPLS VPN of IPv4 among the present invention and IPv6 mixed network structure foreign peoples website;
Fig. 7 is the processing procedure schematic diagram to IPv4 VPN route in the IPv6 network;
Fig. 8 is the processing procedure schematic diagram to IPv6 VPN route in the IPv4 network.
Embodiment
Core of the present invention be at IPv4 in IPv6 network transition process, IPv4 network that will inevitably occur and the simultaneous situation of IPv6 network, proposed to be under the IPv4/v6 hybrid network situation at MPLS backbone network and VPN user network, striding a kind of solution of multi self-governing system BGP/MPLS VPN service accordingly, is to communicate by letter between the VPN user site of identical IP version or different IP version comprising the VPN user network.
For the present invention there being further understanding, to be that the hybrid network that an IPv4 network and IPv6 network are formed is an example with the MPLS backbone network below, be elaborated to communicating by letter between similar net among the BGP/MPLS VPN that strides multi self-governing system IPv4/v6 hybrid network and foreign peoples's web site respectively.
At first the situation for the communication between the similar web site of VPN describes.To be example with Fig. 4 specifically, to striding accordingly among the multi self-governing system IPv4/v6 hybrid network BGP/MPLS VPN, the communication process between similar web site describes.
In Fig. 4, the MPLS backbone network is made up of IPv4 network A S100 and IPv6 network A S200; VPN website 1, website 3 are the IPv4 network, and belong to VPN A; VPN website 2, website 4 are the IPv6 network, and belong to VPN B.
And in Fig. 4, PE1, PE2, ASBR1, ASBR2 are the IPv4/v6 dual stack, and its IPv6 loop-back address is the compatible IPv4 of IPv6 address;
Simultaneously, dispose MP-IBGP between PE1 among Fig. 4 and the ASBR1, dispose MP-IBGP between PE2 and the ASBR2; Dispose MP-EBGP between ASBR1 and the ASBR2; PE1 and CE1, CE2 dispose IGP, EBGP or static routing between PE2 and CE3, the CE4; AS100, AS200 and each VPN website internal operation IGP;
Among the present invention, to the address format in the VPN website, and the address format of router P does not have specific (special) requirements in the MPLS backbone network.
The prerequisite of setting up communication between the VPN website is: the VPN route of learning the other side between the VPN website mutually.Among the present invention, the VPN route is to be delivered to entry PE by outlet PE, ASBR.The VPN route is present among all pe routers and the ASBR.
Be communicated to website 3 with VPN route 100.0.0.0/8 in the website 1 below, it is that the vpn service stream of 100.0.0.1 is example that website 3 sends destination address to website 1, and the implementation of intercommunication describes between similar web site to adopting among the network of over-muti-autonomous system mixed BGP/MPLS VPN that BGP (being MP-EBGP) mode realizes.
At first the processing procedure that VPN route 100.0.0.0/8 in the website 1 is communicated to website 3 describes, and wherein, PE1 to the process of PE2 announcement VPN route 100.0.0.0/8 as shown in Figure 5;
By dispose IGP, EBGP or static routing between PE1 and CE1, CE1 announces the VPN route 100.0.0.0/8 in the website 1 to PE1;
PE1 receives this VPN route, writes among the local VRF A, and is its distributing labels 100; Owing to disposed the MP-IBGP peer-to-peer between PE1 and the ASBR1, therefore, PE1 is to the VPN route of ASBR1 announcement 100.0.0.0/8, and label is 100, and next hop address is the IPv4 loop-back address of PE1.
ASBR1 receives the VPN route of this tape label 100, for it redistributes label 200, and, search the LSP label of ASBR1 to next jumping according to this VPN route, as the stack top label of this VPN route in the label forwarding information table, tag operational information is write the label forwarding information table; Owing to disposed the MP-EBGP peer-to-peer between ASBER1 and the ASBR2, therefore, ASBR1 is 200 VPN route 100.0.0.0/8 to ASBR2 announcement label, and next is jumped and is the IPv4 loop-back address of ASBR1.
Write following clauses and subclauses in the label forwarding information table of ASBR1:
ASBR2 receives this VPN route, for it redistributes label 300; Because the autonomous system at ASBR2 and PE2 place is the IPv6 network, and has disposed MP-IBGP between them, therefore, between ASBR2 and PE2, exist TCP/IPv6 to be connected, set up bgp session; ASBR2 is 300 VPN route 100.0.0.0/8 to PE2 announcement label, and next is jumped and is the IPv4 loop-back address of ASBR2.
Write following clauses and subclauses in the label forwarding information table of ASBR2:
It is 300 VPN route 100.0.0.0/8 that PE2 receives label, according to route target community it is write among the IPv4VRF A; When in VRF A, writing according to next hop address to top label that should the VPN route, because the IPv4 loop-back address 30.0.0.1 that this VPN route next jump address is ASBR2, and that set up between PE2 and the ASBR2 is IPv6 LSP, therefore, need before next hop address 30.0.0.1, add prefix::, searching PE2 arrives:: the LSP label (20) of 30.0.0.1, as the top label of VPN route 100.0.0.0/8 at VRF.
Write following clauses and subclauses among the VRF A of PE2:
Owing between PE2 and CE3, dispose IGP, EBGP or static routing,, and be diffused on website 3 interior other routing devices by CE3 so PE2 can be communicated to CE3 with the VPN route 100.0.0.0/8 in the website of learning 1.
Through above process, the VPN route 100.0.0.0/8 in the website 1 has been communicated to VPN website 3.Adopt same quadrat method, can also be with IPv6 VPN advertising of routes in the website 4 to website 2, but at ASBR1 when PE1 announces IPv6 VPN route, need next jumping be set to ASBR1 the IPv6 loop-back address (:: 20.0.0.1); And PE1 receives the IPv6 VPN route in the website 4, when searching according to next hop address to top label that should the VPN route, the prefix of next hop address (: :) need be cast out, search PE1 to the LSP label of 20.0.0.1 top label, i.e. territory interior label as IPv6 VPN routes in the website 4.
Passed through the route learning between the VPN website, then website 3 can send the vpn service stream that the purpose prefix is 100.0.0.0/8 to website 1; To send destination address to website 1 with website 3 below is that the vpn service stream of 100.0.0.1 is example, and the concrete repeating process of the stream of the vpn service among the present invention is described.
When website 3 when website 1 sends destination address and is the vpn service stream of 100.0.0.1, the main frame in the website 3 sends the vpn service stream that destination address is 100.0.0.1, and this Business Stream is forwarded to CE3;
CE3 receives this vpn service stream, according to the maximum-prefix coupling, searches local routing table, is that the work flow of 100.0.0.1 is issued PE2 with destination address;
PE2 receives the Business Stream that destination address is 100.0.0.1 from interface E1, therefore, searches the VPN route according to the maximum-prefix coupling from VRF A; Find the route of 100.0.0.0/8, and top label is 20, bottom label is 300; This vpn service stream is encapsulated as the MPLS message, is transmitted to ASBR2;
It is 300 vpn service stream that ASBR2 receives label, searches the label forwarding information table, and switch label 200 is transmitted to ASBR1;
It is 200 vpn service stream that ASBR1 receives label, searches the label forwarding information table, and switch label 100 is pressed into label 10 again, is transmitted to PE1;
It is 100 vpn service stream that PE1 receives label, is reduced to the IPv4 Business Stream, and according to the label information that ejects work flow is issued CE1;
CE1 is according to local routing table, is that the IPv4 work flow of 100.0.0.1 is issued the corresponding target main frame with destination address.
Below more in conjunction with the accompanying drawings to the communication between VPN foreign peoples's web site.
Among the present invention, communications portion is divided into following three processes between VPN foreign peoples's web site: route learning between (1) VPN foreign peoples's web site; (2) DNS name resolution; (3) forwarding of vpn service stream.
The processing procedure of communicating by letter between described VPN foreign peoples's web site as shown in Figure 6, among the figure, website 1, website 4 belong to VPN A, website 2, website 3 belong to VPN B; Wherein website 1, website 3 are the IPv4 network, and website 2, website 4 are the IPv6 network; CE1, CE2 insert PE1, CE3, CE4 inserts PE2; The MPLS backbone network is made up of IPv4 network A S100 and IPv6 network A S200.
Compare with communication between similar web site, communication need increase dns server between VPN foreign peoples's web site in foreign peoples's web site, and NAT-PT (DNS-ALG) equipment, wherein: dns server is a domain name resolution server, being used for provides analysis service to the domain name in website 1, the website 3; NAT-PT is network address translation-protocol converter, be used to carry out the bag conversion of IPv4/v6, ICMPv4/v6, DNS-ALG is domain name service-ALG, is used for scanning the IP address of upper-layer protocol and DNS is asked and reply the conversion of carrying out between IP version.Among the present invention, NAT-PT and DNS-ALG are assumed to be and are combined on the same equipment.
The configuration of capital equipment is as follows among Fig. 6:
Dns server, NAT-PT (DNS-ALG), CE1, CE4 all adopt the IPv4/v6 dual stack in PE1, PE2, ASBR1, ASBR2 and website 1, the website 2; Wherein the IPv6 loop-back address of PE1, PE2, ASBR1, ASBR2 is the compatible IPv4 of IPv6 address;
In the configuration site 1 dns server and and website 4 in higher level's dns server address of dns server be respectively NAT-PT (DNS-ALG) address in website 1 and the website 4;
Dispose IGP, EBGP or static routing between PE1 and CE1, PE2 and the CE4;
Between PE1 and the ASBR1, utilize IPv4/v6 loop-back address configuration MP-IBGP between PE2 and the ASBR2, be used to transmit the VPN route of tape label; Utilize IPv4 loop-back address configuration MP-EBGP to transmit the VPN route of tape label between ASBR1 and the ASBR2;
In AS100, the AS200, operation IGP in each VPN website;
The present invention is to the address structure in the VPN website, and the address structure of router P does not all have specific (special) requirements in the MPLS backbone network.
Communicating by letter with IPv6 host B in the website 4 with IPv4 host A in the website 1 below is example, and realization of Communication process between VPN foreign peoples's web site is described.
At first, in order to realize the intercommunication between foreign peoples's web site, need between the VPN website that communicates mutually, carry out route learning; Identical with the process of communication route learning between the similar web site of aforementioned VPN, by CE1 with VPN advertising of route in the website 1 to PE1, be VPN route assignment label and be communicated to PE2 by PE1 by ASBR1, ASBR2, be communicated to CE4 by PE2.Because dns server, NAT-PT (DNS-ALG) are the IPv4/v6 dual stack in CE4, the website 4, therefore, they can learn the IPv4 VPN route in the website 1, comprising the prefix route of dns server, NAT-PT (DNS-ALG) in the website 1, and other all VPN routes in the website 1.
It is identical therewith that website 1 is learned VPN route habit website 4 interior VPN method for routing.
Through above-mentioned route learning, CE1, NAT-PT (DNS-ALG), dns server and other routing devices may learn the IPv6 VPN route of CE4, NAT-PT (DNS-ALG), dns server in the website 4 in the website 1, and other all IPv6 VPN routes in the website 4; CE1, NAT-PT (DNS-ALG), dns server and other routing devices may learn the IPV4 VPN route of CE1, NAT-PT (DNS-ALG), dns server in the website 1 in the website 4, and other all IPv4 VPN routes in the website 1.
After having learnt the other side VPN route mutually between website 1 and the website 4, can begin domain name mapping and Business Stream and transmit process.To initiate the communication of IPv6 host B in website 4 with IPv4 host A in the website 1 below, and IPv6 host B initiation communication of IPv4 host A in website 1 is example in the website 4, describes respectively;
At first, when the IPv6 host B in website 4 of the IPv4 host A in the website 1 was initiated communication, corresponding concrete processing procedure comprised:
The dns server of IPv4 host A in website 1 sends IPv4 DNS request (" A "), because there is not this domain name in the dns server of website 1, therefore this DNS request is addressed to higher level's dns server, be NAT-PT (DNS-ALG) address in the website 1, so this IPv4 DNS request is forwarded to NAT-PT (DNS-ALG);
NAT-PT (DNS-ALG) is with the IPv4 DNS request (" A ") that receives in the website 1, be converted to IPv6 DNS request (" AAAA "), according to the prefix route of dns server in the website of learning 4, IPv6 DNS request is transmitted to the dns server of website 4;
Dns server in the website 4 receives this IPv6 DNS request, resolves and obtains the IPv6 address of host B, and this IPv6 address is returned to the NAT-PT (DNS-ALG) of website 1;
Because dns server has also been learnt the route of NAT-PT (DNS-ALG) in the website 1 in the website 4, therefore, this DNS replys the NAT-PT (DNS-ALG) that is returned in the website 1;
Among the NAT-PT (DNS-ALG) an IPv4 address pool with particular address prefix is arranged in the website 1, pre-configured this prefix route is pointed to NAT-PT (DNS-ALG) in the website 1; NAT-PT (DNS-ALG) replys as DNS from optional IPv4 address in the IPv4 address pool, returns to the dns server in the website 1, after the dns server in the website 1 writes buffer memory with this DNS response message, returns to requesting host A; And, write in the mapping table of NAT-PT (DNS-ALG) in the website 1 mapping address of this IPv4 address as host B IPv6 address;
Host A is constructed the IPv4 packet with this IPv4 address as destination address.Because the particular prefix of this destination address, so this IPv4 packet is routed to NAT-PT (DNS-ALG) in the website 1;
NAT-PT (DNS-ALG) receives the IPv4 packet of particular address prefix in the website 1, searches IPv6 address corresponding with this IPv4 destination address in the mapping table, finds the IPv6 address of host B.Therefore, NAT-PT (DNS-ALG) is converted to the IPv6 packet with this IPv4 packet, mails to the destination host B in the website 4;
Because the NAT-PT (DNS-ALG) in the website 1 is IPv4/v6 pair of stacks, has learnt the IPv6 VPN route in the website 4, therefore, this IPv6 packet can similar Netcom with aforementioned VPN believe that mode is identical, is forwarded to the host B in the website 4.
Initiate communication for the IPv4 host A in website 1 of the IPv6 host B in the website 4, then corresponding concrete processing procedure comprises:
The dns server of IPv6 host B in website 4 sends IPv6 DNS request (" AAAA "), because there is not this domain name in the dns server of website 4, so this DNS request is forwarded to higher level's dns server, i.e. NAT-PT (DNS-ALG) in the website 4;
NAT-PT (DNS-ALG) is converted to IPv4 DNS request (" A ") with this IPv6 DNS request in the website 4, and the prefix route according to dns server in the website of learning 1 mails to dns server in the website 1;
Dns server in the website 1 receives this IPv4 DNS request, resolves the IPv4 address that obtains host A, and this IPv4 address is returned to NAT-PT (DNS-ALG) in the website 4;
Because dns server has also been learnt the route of NAT-PT (DNS-ALG) in the website 4 in the website 1, therefore, this DNS replys the NAT-PT (DNS-ALG) that is returned in the website 4;
NAT-PT (DNS-ALG) receives the IPv4 address of host A in the website 4, and before this address, add a particular prefix, and be configured to the IPv6 address, return to the dns server in the website 4, after dns server in the website 4 writes buffer memory with this DNS response message, return to requesting host B; This address prefix route is a particular prefix route of pointing to NAT-PT (DNS-ALG) in the website 4;
Host B with the IPv6 address that receives as destination address, structure IPv6 packet; Because this IPv6 packet rs destination address has particular prefix, therefore, packet is routed to the NAT-PT (DNS-ALG) in the website 4;
NAT-PT (DNS-ALG) in the website 4 receives this IPv6 packet, with back 32 taking-ups in the destination address, promptly with the IPv4 address of host A as destination address, the IPv6 packet that receives is converted to the IPv4 packet, mail to the IPv4 host A in the website 1;
Because the NAT-PT (DNS-ALG) in the website 4 has learnt the IPv4 VPN route in the website 1, therefore, this IPv4 packet is identical with method for communicating in the similar web site of aforementioned VPN, can be forwarded to the destination host A in the website 1.
Through the detailed description of front at method of the present invention, as can be seen, the present invention has realized striding the advertising of route among the BGP/MPLS VPN of IPv4 and IPv6 hybrid network, thereby makes being transmitted into for may of the Business Stream between user network in the corresponding network.
Method of the present invention is in the specific implementation process, the outlet edge equipment that wherein relates in autonomous system, promptly exporting the processing procedure of searching label in ASBR or the outlet PE accordingly may be different with the protocol version of tab indexes corresponding address information owing to loop-back address, cause needs to adopt particular processing, described special processing also is to realize crucial part of the present invention, to be example below for this reason, this key part will be described with the respective handling process of outlet ASBR under the corresponding situation.
(1) when IPv4 VPN route process IPv6 MPLS backbone network, corresponding processing method specifically comprises as shown in Figure 7 on outlet ASBR:
The network of supposing the ASBR1 place is the IPv6 network, IPv4 VPN route 100.0.0.0/8 when PE1 tape label 100 in ASBR1 announces from website 1, next hop address is the IPv4 loop-back address 10.0.0.1 of PE1, ASBR1 redistributes label 200 for this route, to EBGP peer-to-peer ASBR2 announcement, the processing procedure of ASBR1 when writing tag operational information that should the VPN route in LFIB (label forwarding information table) is:
At first ASBR1 takes out next jumping 10.0.0.1 of this VPN route, before next hop address, add prefix::, ASBR1 searches among the FIB corresponding:: the LSP label 10 of 10.0.0.1, therefore ASBR1 writes following tag operational in LFIB: the MPLS bag that receives label 200 from the E1 interface, then switch label 100, and be pressed into top label 10, and E0 is transmitted to 10.0.0.1 from interface, and the destination address that is actually forwarding corresponds to:: 10.0.0.1; Like this, when ASBR1 when the E1 interface is received the Business Stream of issuing website 1, then corresponding business stream can be transmitted to PE1 by the E0 interface.
(2) when IPv6 VPN route process IPv4 MPLS backbone network, corresponding processing method specifically comprises as shown in Figure 8 on outlet ASBR:
The network of supposing the ASBR1 place is the IPv4 network, the IPv4 VPN route 3ffe:321:01:32 of PE1 tape label 101 in ASBR1 announces from website 2, and next hop address is the IPv6 loop-back address of PE1; ASBR1 redistributes label 201 for this route, announces to ASBR2; The processing method of ASBR1 when in LFIB, writing to tag operational information that should the VPN route:
ASBR1 takes out the next hop address of this VPN route:: 10.0.0.1, cast out prefix::, find the LSP label 10 of 10.0.0.1, in the LFIB of ASBR1, write following tag operational: if ASBR1 receives the MPLSP bag of label 201 from the E1 interface, then switch label 101, and be pressed into top label 10, and E0 is transmitted to from interface:: 10.0.0.1, actual corresponding forwarding address is 10.0.0.1.
In sum, the present invention can solve at the IPv4 network in IPv6 network transition process, the MPLS backbone network provides the IPv4/v6 hybrid network of composition for how tame operator, and the VPN user network also is under the IPv4/v6 hybrid network situation, and BGP/MPLS VPN realizes the problem of proper communication.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the implementation method of the MPLS VPN of a cross-mixed network is characterized in that, comprising:
A, at the autonomous system edge device of MPLS VPN, and configuration of IP v4 and IPv6 protocol stack respectively on provider's edge device;
Main frame between B, user network carries out the announcement of Virtual Private Network route by the edge device that disposes IPv4 and IPv6 protocol stack, and described announcement process is: user network sends advertising of route message to autonomous system, after provider's edge device and autonomous system edge device are received corresponding advertising of route message, determine the IP address information that it adopts according to the IP protocol version information that user network is used, based on described definite IP address information, realize advertising of route by autonomous system between user network;
C, finish advertising of route after, main frame between user network carries out the transmission of Business Stream according to the routing iinformation that obtains.
2. the implementation method of the MPLS VPN of cross-mixed network according to claim 1 is characterized in that, described step B specifically comprises:
B1, user network send advertising of route message by its edge device to provider's edge device;
After B2, provider's edge device are received described advertising of route message, be this route assignment label, and determine the IP address information that self adopts, then this route is sent to the autonomous system edge device;
After B3, autonomous system edge device are received described advertising of route message, continue as this route assignment label, and determine the IP address information that self adopts, transmit described advertising of route message successively backward, up to arriving the opposite end user network.
3. the implementation method of the MPLS VPN of cross-mixed network according to claim 2 is characterized in that, described step B1 comprises:
Interior Gateway Protocol IGP, External BGP EBGP or the static routing of user network by disposing between itself and provider's edge device given provider's edge device with the virtual private network advertising of route in the user network.
4. the implementation method of the MPLS VPN of cross-mixed network according to claim 2 is characterized in that, described step B2 also comprises:
After provider's edge device is received described advertising of route message, the VPN route is write among the local virtual routing forwarding VRF, and determine the IP address information that self adopts according to the IP protocol version information that user network is used;
Provider's edge device sends to the autonomous system edge device with described advertising of route message and the label redistributed and its IP address information based on multi-protocols Internal BGP MP-IBGP.
5. the implementation method of the MPLS VPN of cross-mixed network according to claim 2 is characterized in that, described step B3 also comprises:
After the autonomous system edge device is received described advertising of route message, label and the provider's edge device distributed labels of redistributing write the label forwarding information table;
With described advertising of route message, and in this locality distributed labels and information of self IP address send to the edge device of adjacent autonomous system based on multi-protocols External BGP EBGP once more.
6. the implementation method of the MPLS VPN of cross-mixed network according to claim 5 is characterized in that, described step B3 also comprises:
B31, successively in the territory of autonomous system and carry out the transmission of advertising of route message between the territory, arrive the provider's edge device that is connected with the opposite end user network until described advertising of route message;
B32, provider's edge device send to the user network boundary device of opposite end user network with described advertising of route message based on IGP, EBGP or static routing, and spread described advertising of route message in this locality by it.
7. the implementation method of the MPLS VPN of cross-mixed network according to claim 1 is characterized in that, described step B also comprises:
When next jumping loop-back address is different with the tab indexes corresponding address information version of local terminal in the advertising of route message of receiving as the provider's edge device or the autonomous system edge device of autonomous system outlet edge equipment, then loop-back address is converted to the identical address of version with tab indexes corresponding address information, then, search the label information of determining correspondence according to the loop-back address after the conversion.
8. the implementation method of the MPLS VPN of cross-mixed network according to claim 2 is characterized in that, described step C specifically comprises:
After finishing advertising of route, the user network that receives advertising of route sends Business Stream according to the routing iinformation of the user network that sends advertising of route to it;
After described Business Stream arrived autonomous system, provider's edge device and autonomous system edge device sent to the relative users network according to address information and the label information preserved with described Business Stream.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631090A CN100387019C (en) | 2005-04-04 | 2005-04-04 | Method for realizing cross-mixed network multi-protocol tag exchange virtual special network |
| PCT/CN2006/000561 WO2006105718A1 (en) | 2005-04-04 | 2006-03-30 | A method for realizing the mpls-vpn across the hybrid network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631090A CN100387019C (en) | 2005-04-04 | 2005-04-04 | Method for realizing cross-mixed network multi-protocol tag exchange virtual special network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1848792A CN1848792A (en) | 2006-10-18 |
| CN100387019C true CN100387019C (en) | 2008-05-07 |
Family
ID=37073089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100631090A Expired - Fee Related CN100387019C (en) | 2005-04-04 | 2005-04-04 | Method for realizing cross-mixed network multi-protocol tag exchange virtual special network |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100387019C (en) |
| WO (1) | WO2006105718A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11012349B2 (en) * | 2019-06-28 | 2021-05-18 | Arista Networks, Inc. | Route reflector optimizations for interconnecting MPLS-based L3-VPN and L3-EVPN networks |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405797C (en) * | 2006-12-01 | 2008-07-23 | 清华大学 | IPv4 over IPv6 extension method of BGP protocol software |
| CN101102317B (en) * | 2007-06-29 | 2010-09-29 | 中兴通讯股份有限公司 | Multi-protocol stack connection device and method |
| CN101931586B (en) * | 2009-06-26 | 2012-07-25 | 中国电信股份有限公司 | Method and system for rapidly rerouting MPLS VPN (Multi-Protocol Label Switching Virtual Private Network) |
| CN102075587A (en) * | 2009-11-19 | 2011-05-25 | 中国移动通信集团公司 | Method and system for backuping address mapping relationship |
| CN101917324B (en) * | 2010-08-25 | 2012-06-27 | 北京星网锐捷网络技术有限公司 | Communication method, device and equipment for two-layer virtual private network |
| US8953574B2 (en) * | 2011-11-28 | 2015-02-10 | Qualcomm Incorporated | Wireless bridging in a hybrid communication network |
| CN102833364A (en) * | 2012-08-22 | 2012-12-19 | 深圳市共进电子股份有限公司 | Domain name resolution agent method and gateway device |
| US9014056B2 (en) * | 2012-12-18 | 2015-04-21 | Qualcomm Incorporated | Bridging network devices in a hybrid communication network |
| US9705740B2 (en) * | 2014-02-10 | 2017-07-11 | Google Inc. | Using unified API to program both servers and fabric for forwarding for fine-grained network optimizations |
| CN105141538B (en) * | 2015-09-21 | 2018-04-27 | 盛科网络（苏州）有限公司 | A kind of across a network pile system and its processing method to message |
| CN106559505A (en) * | 2015-09-25 | 2017-04-05 | 中兴通讯股份有限公司 | IP method for parameter configuration, network address processing method and processing device |
| CN111313961B (en) * | 2020-02-25 | 2021-08-31 | 中国电子科技集团公司第五十四研究所 | Routing control method suitable for space-ground biplane network architecture |
| US11502946B2 (en) * | 2020-03-10 | 2022-11-15 | Juniper Networks, Inc. | Distributed label assignment for labeled routing protocol routes |
| CN112769614B (en) * | 2021-01-04 | 2022-04-15 | 烽火通信科技股份有限公司 | Automatic management method of VPN (virtual private network) on demand and intercommunication system of heterogeneous network |
| CN113904981B (en) * | 2021-09-15 | 2023-11-17 | 锐捷网络股份有限公司 | Routing information processing method and device, electronic equipment and storage medium |
| CN114650271B (en) * | 2022-03-23 | 2023-12-05 | 杭州迪普科技股份有限公司 | Global load DNS neighbor site learning method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433195A (en) * | 2002-01-18 | 2003-07-30 | 富士通株式会社 | Multiple protocol label converting network system |
| CN1466340A (en) * | 2002-06-24 | 2004-01-07 | �人��������������ι�˾ | Method for forwarding data by strategic stream mode and data forwarding equipment |
| CN1507230A (en) * | 2002-12-10 | 2004-06-23 | ��Ϊ��������˾ | Method of realizing special multiple-protocol label exchanging virtual network |
| US20050025157A1 (en) * | 2003-05-26 | 2005-02-03 | Pennec Jean-Francois Le | System for converting data based upon IPv4 into data based upon IPv6 to be transmitted over an IP switched network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862274B1 (en) * | 2000-10-26 | 2005-03-01 | Industrial Technology Research Institute | Method and system capable of providing mobility support for IPv4/IPv6 inter-networking |
| JP2003283587A (en) * | 2002-03-20 | 2003-10-03 | Mitsubishi Electric Corp | Receiver for radio communications |
| CN100379219C (en) * | 2003-07-23 | 2008-04-02 | 中国科学院计算技术研究所 | Method for realizing IP network terminal communication by NAT-PT and customer/servo mode |
-
2005
- 2005-04-04 CN CNB2005100631090A patent/CN100387019C/en not_active Expired - Fee Related
-
2006
- 2006-03-30 WO PCT/CN2006/000561 patent/WO2006105718A1/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433195A (en) * | 2002-01-18 | 2003-07-30 | 富士通株式会社 | Multiple protocol label converting network system |
| CN1466340A (en) * | 2002-06-24 | 2004-01-07 | �人��������������ι�˾ | Method for forwarding data by strategic stream mode and data forwarding equipment |
| CN1507230A (en) * | 2002-12-10 | 2004-06-23 | ��Ϊ��������˾ | Method of realizing special multiple-protocol label exchanging virtual network |
| US20050025157A1 (en) * | 2003-05-26 | 2005-02-03 | Pennec Jean-Francois Le | System for converting data based upon IPv4 into data based upon IPv6 to be transmitted over an IP switched network |
Non-Patent Citations (2)
| Title |
|---|
| 基于MPLS的IPV4向IPV6过渡机制. 万仁福，李方伟.现代电信科技，第8期. 2004 |
| 基于MPLS的IPV4向IPV6过渡机制. 万仁福，李方伟.现代电信科技，第8期. 2004 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11012349B2 (en) * | 2019-06-28 | 2021-05-18 | Arista Networks, Inc. | Route reflector optimizations for interconnecting MPLS-based L3-VPN and L3-EVPN networks |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006105718A1 (en) | 2006-10-12 |
| CN1848792A (en) | 2006-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100387019C (en) | Method for realizing cross-mixed network multi-protocol tag exchange virtual special network | |
| CN100411381C (en) | Communication method and system between mixed network VPN stations across different autonomous systems | |
| US9722878B2 (en) | Seamless segment routing | |
| CN1266913C (en) | Tunneling through access network | |
| US10116556B2 (en) | Techniques for routing and forwarding between multiple virtual routers implemented by a single device | |
| RU2302035C2 (en) | 3-level virtual vpn network and method for building the same | |
| EP2027679B1 (en) | Routing multicast traffic | |
| EP1811728B1 (en) | Method, system and device of traffic management in a multi-protocol label switching network | |
| US7095740B1 (en) | Method and apparatus for virtual overlay networks | |
| CN100450065C (en) | Method for providing communication between virtual special network stations | |
| WO2008098493A1 (en) | A method for aggregating routes, a method for forwarding messages and an autonomous system border router | |
| WO2008009223A1 (en) | A method and router for route distribution | |
| CN100481817C (en) | Multi-domain multicast integration data distributing structure and method based on IP/MPLS/BGP | |
| CN103841024A (en) | Method for achieving data distribution in home gateway and home gateway | |
| CN102546433A (en) | Data forwarding method based on MPLS (Multi Protocol Label Switching) VPN (Virtual Private Network) and PEs (Provider Edges) | |
| CN103326915A (en) | Method, device and system for achieving three-layer VPN | |
| CN100428739C (en) | Implementing method and system for support VPLS service on IP skeletal network | |
| CN100414919C (en) | Method for realizing virtual special network of over-muti-autonomous system mixed network | |
| CN102474451B (en) | Connect internal layer and outer MPLS label | |
| JP2012175198A (en) | Circulation route setting system and method | |
| WO2023284675A1 (en) | Forwarding table lookup method and apparatus, and storage medium and electronic apparatus | |
| US20090041044A1 (en) | method or apparatus for distributing routing information in networks | |
| CN110995884A (en) | Method for cleaning and transmitting flow based on Anycast architecture DNS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080507 Termination date: 20170404 |