CN105939261A - Method and device for statically configuring VPN routing - Google Patents
Method and device for statically configuring VPN routing Download PDFInfo
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- CN105939261A CN105939261A CN201510589749.9A CN201510589749A CN105939261A CN 105939261 A CN105939261 A CN 105939261A CN 201510589749 A CN201510589749 A CN 201510589749A CN 105939261 A CN105939261 A CN 105939261A
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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
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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Abstract
The invention provides a method and a device for statically configuring VPN routing. The method comprises the steps of acquiring a target address network segment to be configured in a VPN; acquiring a fixed label value pre-bound with virtual routing forwarding (VRF) corresponding to the target address network segment to be configured; acquiring the address information of an opposite-end device to which the VRF belongs; and according to the fixed label value and the address information of the opposite-end PE device, configuring the VPN routing for the target address network segment to be configured. The method can statically configure the VPN routing for the target address network segment, and ensures that the situation that the network communication is failed due to the variation of the configured label and the VPN routing when the network oscillates is avoided.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of static configuration VPN method for routing and dress
Put.
Background technology
MPLS L3VPN is service provider VPN (Virtual Private Network, VPN (virtual private network))
A kind of L3VPN technology based on PE (Provider Edge, service provider edge devices) in solution,
It uses BGP (Border Gateway Protocol, Border Gateway Protocol) on service provider backbone
Dynamic publishing VPN route, and uses MPLS (Multi-Protocol Label Switching, multiprotocol label
Exchange) on service provider backbone, forward VPN data message.VPN data message is at carrier network
Middle transmission need add two-layer MPLS label, outer layer label be LDP (Label Distribution Protocol,
Tag distribution protocol) label, for by MPLS L3VPN public network tunnel, vpn label is BGP label
(i.e. VRF label), is used for identifying VRF.In prior art, outer layer label value is to enable LDP association
View distribution, VRF (Virtual Routing and Forwarding, virtual flow-line and forwarding) label value is
Bgp protocol distribution.
But, the label value of bgp protocol distribution is all dynamic, i.e. cannot join according to the VRF label of opposite end
Put static VPN route.Even if by checking that the VRF label that current bgp protocol distributes is configured with quiet reluctantly
State VPN route, when network shakes, when bgp protocol redistributes VRF label, owing to VRF marks
Label there occurs change, then the VPN route forwarding table items before configured just has become a wrong VPN road
By forwarding-table item, and then cause network service failure.
Summary of the invention
For the defect of prior art, the invention provides a kind of static configuration VPN method for routing and
Device.
The present invention provides a kind of static configuration VPN method for routing, the local service being applied in VPN
Provider edge PE equipment, wherein the method includes:
Obtain the destination address network segment to be configured in described VPN；
Obtain is the virtual flow-line corresponding with the described destination address network segment to be configured and forwarding VRF binding in advance
Fixed labels value；
Obtain the address information of opposite end PE equipment belonging to described VRF；
Address information according to described fixed labels value and described opposite end PE equipment is described purpose to be configured
Address network segment static configuration VPN route.
The present invention also provides for a kind of static configuration VPN route device, the local PE being applied in VPN
Equipment, described device includes:
Network segment acquiring unit, for obtaining the destination address network segment to be configured in described VPN；
Label acquiring unit, ties up for the VRF corresponding with the described destination address network segment to be configured in advance for obtaining
Fixed fixed labels value；
Address acquisition unit, for obtaining the address information of the opposite end PE equipment belonging to described VRF；
Routing configuration unit, for according to described fixed labels value and the address information of described opposite end PE equipment
For described destination address network segment static configuration VPN route to be configured.
The present invention provides a kind of static configuration VPN method for routing and device, is with to be configured in advance obtaining
The fixed labels value of the VRF binding that the destination address network segment is corresponding, and the ground of opposite end PE equipment belonging to VRF
After the information of location, it is mesh to be configured according to the fixed labels value of this acquisition and the address information of opposite end PE equipment
Address network segment static configuration VPN route.As can be seen here, the present invention can for the purpose of address network segment static configuration
VPN route, and ensure that when network occurs concussion, will not occur because of the label of configuration and VPN route
Change, and cause the situation that network service is failed.
Accompanying drawing explanation
Fig. 1 is a kind of static configuration VPN method for routing application scenarios schematic diagram in the embodiment of the present invention；
Fig. 2 is a kind of static configuration VPN method for routing schematic flow sheet in the embodiment of the present invention；
Fig. 3 is the logical structure signal of a kind of static configuration VPN route device in the embodiment of the present invention
Figure；
Fig. 4 is the hardware structure of the static configuration VPN route device place network equipment in the embodiment of the present invention
Schematic diagram.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, referring to the drawings to this Shen
Please scheme be described in further detail.
In order to solve problems of the prior art, the invention provides a kind of static configuration VPN route side
Method and device.
Fig. 1 shows the VPN environment schematic that the inventive method is applied, including multiple PE equipment
(such as, PE1, PE2, PE3 and PE4), P (Provider, Provider Equipment), multiple CE (Customer
Edge, user network boundary device) (such as, CE1, CE2, CE3, CE4 and CE5) and point
The VRF (such as, VRF-1, VRF-2, VRF-3, VRF-4 and VRF-5) not being connected with multiple CE equipment.
Refer to Fig. 2, the handling process schematic diagram of static configuration VPN method for routing provided for the present invention,
The local PE equipment that this static configuration VPN method for routing is applied in VPN.Wherein, this static state is joined
Put VPN method for routing to comprise the following steps:
Step 201, obtains the destination address network segment to be configured in described VPN；
In the embodiment of the present invention, each PE equipment can safeguard one or more VRF, and multiple VRF are mutual
Separating independent, dividing in each VRF has multiple destination address network segment being managed, and each VRF has oneself only
Vertical route forwarding table items.
In actual application, can be that each VRF in VPN binds a fixed labels value in advance,
I.e. static labels value, this fixed labels value is used for identifying VRF, logical after data message arrives opposite end PE equipment
Overmatching VRF carries out routing forwarding.The most whenever, how to shake regardless of procotol, at BGP
When issuing VPN route, this fixed labels value is all used to identify the VRF of correspondence.
Specifically, the fixed labels value for VRF binding can use the side that fixing initial value+VRF-ID offsets
Formula realizes.
Such as, if the initial value of label is 1044480 (0xFF000), VRF-ID is VRF-1, then for
The fixed labels value of this VRF-1 binding is then 1044481 (1044480+1, it may be assumed that 0xFF001).In like manner,
Fixed labels value for VRF-2 binding is then 1044482 (1044480+2, it may be assumed that 0xFF002).
Each PE equipment can get the fixed labels value bound for each VRF.At needs in VPN
Certain destination address network segment carry out static state VPN routing configuration time, can first obtain and need to carry out VPN
The destination address network segment of routing configuration, needs the destination address network segment carrying out VPN routing configuration as treating using this
Configuration purpose address network segment.
Step 202, obtaining is the fixing of the VRF binding corresponding with the described destination address network segment to be configured in advance
Label value；
Then, search this destination address network segment place VRF to be configured, and be retrieved as this destination to be configured
The fixed labels value of network segment place, location VRF binding.
Step 203, obtains the address information of opposite end PE equipment belonging to described VRF；
In the embodiment of the present invention, in advance by artificially specifying the letter of PE equipment belonging to each VRF in VPN
Breath, includes the address information of each PE equipment, for Auto-matching this locality PE equipment to opposite end in this information
The public network label in the MPLS public network tunnel of PE equipment.
Wherein, the address information of this opposite end PE equipment can be the loopback port address of opposite end PE equipment
(loopback mouth) or the interface IP address of opposite end PE equipment.
Due to the label that fixed labels value be static configuration corresponding with VRF acquired in the embodiment of the present invention
Value, correspondingly, when the address information of the opposite end PE equipment obtained belonging to VRF (to obtain belonging to VRF
Opposite end PE equipment loopback port address as a example by), this VRF can be obtained in the way of using static state acquisition corresponding
The address information of opposite end PE equipment.
Step 204, according to the address information of described fixed labels value and described opposite end PE equipment be described in treat
The destination address network segment static configuration VPN route of configuration.
Get in advance for corresponding with the destination address network segment to be configured VRF binding fixed labels value and
After the address information of the opposite end PE equipment belonging to VRF that the destination address network segment to be configured is corresponding, can think
This destination address network segment static configuration VPN route to be configured.
Owing to the data message when accessing opposite end VRF is above-mentioned for identifying opposite end VRF except carrying
Fixed labels outside, in addition it is also necessary to carrying can be by the outer layer label in public network tunnel, i.e. the LDP of LDP distribution
Label.Therefore, in the embodiment of the present invention, for the purpose of address network segment static configuration VPN route while,
Can also dynamically obtain this LDP label, to ensure when accessing opposite end VRF, can be by the PE in public network
Equipment or P equipment forward this data message according to this LDP label in public network.
It addition, after the configuration completing VPN route, in addition it is also necessary to the VPN route of configuration is preserved to local
In VPN route forwarding table items corresponding with specifying VRF on PE equipment, owing to each PE equipment can be tieed up
Protect multiple VRF, therefore, in the embodiment of the present invention, it is also possible to the appointment on the PE equipment of static configuration this locality
VRF, needs to preserve to local PE equipment, in order to determine to route the VPN of static configuration, which that safeguarded
In VPN route forwarding table items corresponding for VRF.This appointment VRF can by developer according to demand depending on.
So, the VPN route configured then includes the destination address network segment to be configured and mesh to be configured
The address information (loopback port address) of the opposite end PE equipment belonging to VRF corresponding to address network segment, fixing mark
The routing iinformations such as label value, LDP label and appointment VRF.
Afterwards, the VPN of static configuration is route the finger with static configuration on the most described local PE equipment of preservation
Determine in VPN route forwarding table items corresponding for VRF.
Further, the embodiment of the present invention can also be that the VPN route setting of static configuration is higher than described this locality
The priority of the Dynamic VPN route that PE equipment prestores, so that after receiving the message accessing the target network segment,
Preferentially it route according to the VPN of described static configuration and described message is forwarded.
Specifically, VPN route and the BGP that can also be respectively static configuration in the embodiment of the present invention are dynamic
The VPN route of configuration arranges priority, need not according to the VPN of dynamically configuration in prior art user
During route, the VPN of this static configuration can be route what setting dynamically configured higher than this BGP
The priority of VPN route, so, in the datagram received for the purpose of destination address in address network segment
Wen Hou, then can be carried out the data message received with the VPN route of the high static configuration of prioritizing selection priority
Process.
Below in conjunction with Fig. 1, the present invention is further illustrated by.
It is assumed that the VRF that local PE equipment is the upper maintenance of PE1, PE1 is VRF1 and VRF2, in advance
Divide for the fixed labels of VRF-1, VRF-2, VRF-3, VRF-4 and VRF-5 binding in VPN
It is not 1044481,1044482,1044483,1044484 and 1044485.Destination network segment to be configured is
192.168.0.0/16, this destination address network segment belongs to VRF4.
For the purpose of during network segment 192.168.0.0/16 configuration VPNv4 route, obtain the PE belonging to VRF-3
The loopback port address of equipment, it is assumed that the loopback mouth that PE equipment is PE3, the PE3 ground belonging to the VRF-4 of acquisition
Location is 1.1.1.1.Further, the appointment VRF of static configuration is VRF-2.So, the VPN of this static configuration
V4 routing iinformation can be as shown in table 1:
Table 1
Table 1 shows the VPN routing iinformation of static configuration, is only the example for being further appreciated by the present invention,
It is not limited to the particular content of the VPN routing iinformation of static configuration in the embodiment of the present invention.
It addition, for ensureing when receiving the data message accessing opposite end VRF, can be by the PE in public network
The public network label (LDP label) that equipment or P equipment distribute according to LDP forwards this datagram in public network
Literary composition.Therefore, for the purpose of while address network segment static configuration VPN route, it is also possible to dynamically obtain LDP
The LDP label of distribution, it is assumed that the LDP label of acquisition is 20.
Meanwhile, address information and the outgoing interface information of the next-hop device arriving this destination address network segment are obtained.
It is assumed that the address of acquired next-hop device is 10.1.1.1, going out port is G1/1.
So, this interpolation is to the VPN specified in VPN route forwarding table items corresponding for VRF (VRF-2)
Route can be as shown in table 2:
Table 2
Table 2 shows the VPN routing iinformation added in the route forwarding table items specifying VRF, is only for entering
One step understands the example of the present invention, is not limited in the embodiment of the present invention specify the route forwarding table of VRF
The particular content of the VPN routing iinformation added in Xiang.
The destination address network segment that local PE equipment PE1 accesses VRF-4 the user receiving VRF-2 is
During data message 192.168.0.0/16, PE1 then can be according to configuration in the route forwarding table items of VRF2
This data message is added vpn label by VPN routing iinformation, it may be assumed that fixed labels value 1044484；And outward
Layer label, it may be assumed that LDP label value 20, and forward this data message according to this routing iinformation.
When this data message arrives the PE3 belonging to VRF-4, outer layer label is stripped, now can basis
The vpn label 1044484 that this data message carries finds the VRF-4 of correspondence, corresponding at VRF-4 afterwards
Routing table in search routing forwarding.
It should be noted that the static configuration VPN method for routing provided in the embodiment of the present invention is except applicable
In above-mentioned example outside VPNv4 routing configuration, it is also possible to be applicable to VPNv6,6PE route and 6VPE
Routing configuration of route etc..When carrying out the routing configuration of VPNv6,6PE route and 6VPE route,
Can refer to the handling process of VPNv4 routing configuration in above-mentioned example.Unlike configuration VPNv4 route:
When configuring VPNv6 route, above-mentioned IP address is IPv6 address；When configuring 6VPE route,
The IP address of above-mentioned destination network segment to be configured is IPv6 address；When configuring 6PE route, owing to 6PE joins
Put is not VPN route, but common IPv6 route, it is not necessary to again by artificially configuring the VRF specified,
And the route relevant for all 6PE that BGP issues, all use same fixed labels, therefore in static configuration
During 6PE route, the fixing label value of only one can be preassigned and forward for 6PE, such as 1044480
(0xFF000)。
Certainly, the embodiment of the present invention is also not limited to the static configuration to above-mentioned various routes, for other
Need the scene that static configuration route, it is also possible to the most above-mentioned flow process carries out static routing
Configuration, will not enumerate at this.
In sum, the static configuration VPN method for routing that the present invention provides, is with to be configured obtaining in advance
The fixed labels value of the VRF binding that the destination address network segment is corresponding, and the ground of opposite end PE equipment belonging to VRF
After the information of location, it is mesh to be configured according to the fixed labels value of this acquisition and the address information of opposite end PE equipment
Address network segment static configuration VPN route.As can be seen here, the present invention can for the purpose of address network segment static configuration
VPN route, and ensure that when network occurs concussion, will not occur because of the label of configuration and VPN route
Change, and cause the situation that network service is failed.
The present invention also provides for a kind of static configuration VPN route device, and Fig. 3 is this static configuration VPN route
The structural representation of device, this device can apply to the local PE equipment in VPN, and this static state is joined
Put VPN route device and can include network segment acquiring unit 301, label acquiring unit 302, address acquisition list
Unit 303 and routing configuration unit 304, wherein:
Network segment acquiring unit 301, for obtaining the destination address network segment to be configured in described VPN；
Label acquiring unit 302, is the VRF corresponding with the described destination address network segment to be configured for obtaining in advance
The fixed labels value of binding；
Address acquisition unit 303, for obtaining the address information of the opposite end PE equipment belonging to described VRF；
Routing configuration unit 304, for according to described fixed labels value and the address of described opposite end PE equipment
Information is described destination address network segment static configuration VPN route to be configured.
Further, described device also includes routeing storage unit 305, for by the VPN road of static configuration
By preserving in VPN route forwarding table items corresponding with specifying VRF to described local PE equipment.
Further, the address information of described opposite end PE equipment includes the loopback mouth ground of described opposite end PE equipment
Location or any one of interface IP address.
Further, described device also includes that priority arranges unit 306, for the VPN for static configuration
Route arranges the priority of the BGP VPN route prestored higher than described local PE equipment, so that receiving
After accessing the message of the target network segment, preferentially it route according to the VPN of described static configuration and carry out described message turning
Send out.
The present invention is applied to the static configuration VPN route device of the network equipment in concrete handling process
Can be consistent with the handling process of above-mentioned static configuration VPN route device, do not repeat them here.
Said apparatus can be realized by software, it is also possible to is realized by hardware, static configuration VPN of the present invention
The hardware structure schematic diagram of the route device place network equipment all refers to shown in Fig. 4, its basic hardware environment
Including central processor CPU, forwarding chip, memorizer and other hardware, wherein memory device includes
Machine readable instructions, CPU reads and performs machine readable instructions and performs the function of each unit in Fig. 3.
It can be seen that the present invention provides a kind of static state to join from the embodiment of any of the above device and device
Put VPN method for routing and device, be the VRF corresponding with the destination address network segment to be configured in advance obtaining
The fixed labels value of binding, and after the address information of opposite end PE equipment belonging to VRF, according to this acquisition
The address information of fixed labels value and opposite end PE equipment is destination address network segment static configuration to be configured
VPN route.As can be seen here, the present invention can for the purpose of address network segment static configuration VPN route, and ensure that
When network occurs concussion, will not change because of the label of configuration and VPN route, and cause network to lead to
Believe failed situation.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within the spirit of invention and principle, any modification, equivalent substitution and improvement etc. done, should be included in
Within the scope of protection of the invention.
Claims (8)
1. a static configuration VPN (virtual private network) VPN method for routing, the local clothes being applied in VPN
Business provider edge PE equipment, it is characterised in that described method includes:
Obtain the destination address network segment to be configured in described VPN；
Obtain is the virtual flow-line corresponding with the described destination address network segment to be configured and forwarding VRF binding in advance
Fixed labels value；
Obtain the address information of opposite end PE equipment belonging to described VRF；
Address information according to described fixed labels value and described opposite end PE equipment is described purpose to be configured
Address network segment static configuration VPN route.
2. the method for claim 1, it is characterised in that described method also includes:
The VPN of static configuration is route and preserves VPN corresponding with specifying VRF to described local PE equipment
In route forwarding table items.
3. the method for claim 1, it is characterised in that the address information bag of described opposite end PE equipment
Include loopback port address or any one of interface IP address of described opposite end PE equipment.
4. the method for claim 1, it is characterised in that described method also includes:
VPN for static configuration route the Border Gateway Protocol that setting prestores higher than described local PE equipment
The priority of BGP VPN route, so that after receiving the message accessing the target network segment, preferentially according to described
Described message is forwarded by the VPN route of static configuration.
5. a static configuration VPN route device, the local PE equipment being applied in VPN, it is special
Levying and be, described device includes:
Network segment acquiring unit, for obtaining the destination address network segment to be configured in described VPN；
Label acquiring unit, ties up for the VRF corresponding with the described destination address network segment to be configured in advance for obtaining
Fixed fixed labels value；
Address acquisition unit, for obtaining the address information of the opposite end PE equipment belonging to described VRF；
Routing configuration unit, for according to described fixed labels value and the address information of described opposite end PE equipment
For described destination address network segment static configuration VPN route to be configured.
6. device as claimed in claim 5, it is characterised in that described device also includes:
Route storage unit, for the VPN of static configuration is route preserve to the most described local PE equipment with
In specifying VPN route forwarding table items corresponding for VRF.
7. device as claimed in claim 5, it is characterised in that the address information bag of described opposite end PE equipment
Include loopback port address or any one of interface IP address of described opposite end PE equipment.
8. device as claimed in claim 5, it is characterised in that described device also includes:
Priority arranges unit, arranges higher than described local PE equipment for routeing for the VPN of static configuration
The priority of the BGP VPN route prestored, so that after receiving the message accessing the target network segment, preferential root
It route according to the VPN of described static configuration and described message is forwarded.
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| CN108600109A (en) * | 2018-03-19 | 2018-09-28 | 新华三技术有限公司 | A kind of message forwarding method and device |
| CN112272145A (en) * | 2020-10-26 | 2021-01-26 | 新华三信息安全技术有限公司 | Message processing method, device, equipment and machine readable storage medium |
| CN115334045A (en) * | 2022-08-12 | 2022-11-11 | 迈普通信技术股份有限公司 | Message forwarding method, device, gateway equipment and storage medium |
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