CN114650248B - Processing method and system of routing information and autonomous system boundary router - Google Patents

Processing method and system of routing information and autonomous system boundary router Download PDF

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Publication number
CN114650248B
CN114650248B CN202011391341.8A CN202011391341A CN114650248B CN 114650248 B CN114650248 B CN 114650248B CN 202011391341 A CN202011391341 A CN 202011391341A CN 114650248 B CN114650248 B CN 114650248B
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asbr
evpn
information
routing information
route
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CN114650248A (en
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尹远阳
叶和亮
卢泉
杨广铭
李玉娟
孙嘉琪
蓝双凤
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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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
    • H04L45/34—Source routing
    • 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
    • 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
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/52—Multiprotocol routers
    • 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
    • H04L45/74—Address processing for routing

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  • 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 disclosure relates to a method, a system and an autonomous system boundary router for processing routing information, and relates to the field of communication. The method of the present disclosure comprises: the first autonomous system border router ASBR receives first route release information sent by a second ASBR, wherein the first ASBR is an ASBR of an Ethernet virtual private network EVPN, the second ASBR is an ASBR of a three-layer virtual private network L3VPN, and the first route release information comprises: VPNv4 or VPNv6unicast routing information of the device in the L3 VPN; the first ASBR converts the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information, and generates second routing release information; the first ASBR transmits the second route publication information into the EVPN so that devices in the EVPN learn route information of devices in the L3VPN.

Description

Processing method and system of routing information and autonomous system boundary router
Technical Field
The present disclosure relates to the field of communications, and in particular, to a method and a system for processing routing information, and an autonomous system border router.
Background
With the deployment of new IP network technologies in further simplifying network protocols, such as SRv (Segment Routing IPv, segment routing IPv 6) and EVPN (Ethernet Virtual Private Network ) technologies, the deployment of network service deployment capabilities is further enhanced, and high attention is paid to operators.
For a newly built IP network, a new technology deployment mode of BGP (Border Gateway Protocol ) EVPN (Layer 3Virtual Private Network, three-Layer virtual private network) is adopted in a large scale, and the existing old IP network only supports a traditional BGP (Multi-Protocol Label Switching, multiprotocol label switching) BGP L3VPN technology deployment mode due to equipment capacity limitation. Thus, there will be a new network coexisting with the legacy network for a long period of time.
Disclosure of Invention
The inventors found that: because the traditional network and the new network coexist, the problem of intercommunication between the traditional network and the new network networking service is faced, and the existing old IP network adopts the traditional BGP L3VPN networking mode, and cannot upgrade and support the EVPN and other new technologies due to the limitation of equipment. The new IP network can be deployed based on the EVPN new technology, has no related mature scheme and technical standard for the intercommunication scene of the new technology and the traditional technology, and has three-layer service intercommunication difficulty.
One technical problem to be solved by the present disclosure is: how to implement interworking of a new network supporting EVPN and a legacy network supporting L3VPN.
According to some embodiments of the present disclosure, a method for processing routing information is provided, including: the first autonomous system border router ASBR receives first route release information sent by a second ASBR, wherein the first ASBR is an ASBR of an Ethernet virtual private network EVPN, the second ASBR is an ASBR of a three-layer virtual private network L3VPN, and the first route release information comprises: VPNv4 or VPNv6unicast routing information of the device in the L3 VPN; the first ASBR converts the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information, and generates second routing release information; the first ASBR transmits the second route publication information into the EVPN so that devices in the EVPN learn route information of devices in the L3VPN.
In some embodiments, the method further comprises: the first ASBR receives third route release information sent by an operator edge device PE in the EVPN, wherein the third route release information comprises: EVPN routing information of devices in the EVPN; the first ASBR converts the EVPN route information of the equipment in the EVPN into VPNv4 or VPNv6unicast route information, and generates fourth route release information; the first ASBR sends the fourth route publication information to the second ASBR so that the second ASBR publishes the fourth route publication information in the L3VPN.
In some embodiments, the first ASBR converting the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into EVPN routing information includes: the first ASBR converts the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information according to the format of the VPNv4 or VPNv6unicast routing information in the network layer reachability message NLRI and the format of the EVPN routing information in the NLRI; alternatively, the first ASBR converting EVPN routing information of the device in the EVPN into VPNv4 or VPNv6unicast routing information includes: the first ASBR converts the EVPN routing information of the device in the EVPN into VPNv4 or VPNv6unicast routing information according to the format of the VPNv4 or VPNv6unicast routing information in the NLRI and the format of the EVPN routing information in the NLRI.
In some embodiments, the first ASBR converting the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into the EVPN routing information according to a format of the VPNv4 or VPNv6unicast routing information in the NLRI and a format of the EVPN routing information in the NLRI includes: the first ASBR converts a route identifier RD corresponding to VPNv4 or VPNv6unicast route information of equipment in the L3VPN in NLRI into an RD corresponding to EVPN route information in NLRI; the first ASBR converts the label corresponding to the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the multiprotocol label switching MPLS label corresponding to the EVPN routing information in the NLRI; the first ASBR converts the corresponding prefix of the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the corresponding IP prefix length and IP prefix of the EVPN routing information in the NLRI; the first ASBR populates 0 an ethernet segment identifier field, an ethernet tag ID field, and a gateway IP address field corresponding to the EVPN routing information in the NLRI.
In some embodiments, the first ASBR converting the EVPN routing information of the device in EVPN to VPNv4 or VPNv6unicast routing information according to a format of the VPNv4 or VPNv6unicast routing information in the NLRI and a format of the EVPN routing information in the NLRI comprises: the first ASBR deletes the Ethernet segment identifier field, the Ethernet tag ID field and the gateway IP address field corresponding to the EVPN routing information of the equipment in the EVPN in the NLRI; the first ASBR converts RD corresponding to EVPN route information of equipment in the EVPN in the NLRI into RD corresponding to VPNv4 or VPNv6unicast route information in the NLRI; the first ASBR converts the corresponding MPLS label of the EVPN route information of the equipment in the EVPN in the NLRI into the label corresponding to the VPNv4 or VPNv6unicast route information in the NLRI; the first ASBR converts the IP prefix length corresponding to the EVPN routing information of the equipment in the EVPN in the NLRI into the prefix corresponding to the VPNv4 or VPNv6unicast routing information in the NLRI.
In some embodiments, generating the second route publication information includes: the first ASBR inherits other attributes and route conversion rules except NLRI in the first route release information to generate second route release information; alternatively, generating the fourth route publication information includes: the first ASBR inherits other attributes and routing conversion rules than the NLRI in the third routing information to generate fourth routing information.
In some embodiments, the method further comprises: the first ASBR and the second ASBR establish MP-BGP neighbor relation, so that the first ASBR supports VPNv4 or VPNv6unicast address family; and the PE in the first ASBR and the EVPN establishes MP-BGP neighbor relation, so that the first ASBR supports the EVPN address family.
In some embodiments, the method further comprises: under the condition that an end-to-end tunnel is formed between PE in the EVPN and PE in the L3VPN, the first ASBR does not change the next hop when generating second route release information; under the condition that an end-to-end tunnel cannot be formed between PE in the EVPN and PE in the L3VPN, when the second route release information is generated, the first ASBR changes the next hop into the first ASBR, and multi-section tunnel splicing is achieved.
According to further embodiments of the present disclosure, there is provided an autonomous system border router, ASBR, wherein the ASBR, as a first ASBR, comprises: the receiving module is configured to receive first route distribution information sent by a second ASBR, where the first ASBR is an ASBR of an ethernet virtual private network EVPN, the second ASBR is an ASBR of a three-layer virtual private network L3VPN, and the first route distribution information includes: VPNv4 or VPNv6unicast routing information of the device in the L3 VPN; the conversion module is used for converting the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information and generating second routing release information; and the sending module is used for sending the second route release information to the EVPN so that the equipment in the EVPN learns the route information of the equipment in the L3VPN.
In some embodiments, the receiving module is further configured to receive third route distribution information sent by the operator edge device PE in the EVPN, where the third route distribution information includes: EVPN routing information of devices in the EVPN; the conversion module is also used for converting EVPN route information of the equipment in the EVPN into VPNv4 or VPNv6unicast route information and generating fourth route release information; the sending module is further configured to send the fourth route distribution information to the second ASBR, so that the second ASBR distributes the fourth route distribution information in the L3VPN.
According to still further embodiments of the present disclosure, there is provided an autonomous system border router including: a processor; and a memory coupled to the processor for storing instructions that, when executed by the processor, cause the processor to perform the method of processing routing information as in any of the embodiments described above.
According to still further embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the method of processing routing information of any of the foregoing embodiments.
According to still further embodiments of the present disclosure, there is provided a processing system of routing information, including: the autonomous system border router ASBR of any of the preceding embodiments as a first ASBR; and a second ASBR for transmitting the first route distribution information; the second ASBR is an ASBR of a three-layer virtual private network L3VPN.
In some embodiments, the second ASBR is further configured to receive fourth route publication information sent by the first ASBR; the first ASBR and the second ASBR establish MP-BGP neighbor relation, so that the first ASBR supports VPNv4 or VPNv6unicast address families.
In the scheme of the disclosure, after receiving the first route release information sent by the second ASBR arranged on the L3VPN, the first ASBR arranged on the EVPN converts the VPNv4 or VPNv6unicast route information of the device in the L3VPN into the EVPN route information, generates the second route release information, and then sends the second route release information to the EVPN. Because the conversion of the VPNv4 or VPNv6unicast routing information and the EVPN routing information is realized, the equipment in the EVPN can learn the routing information of the equipment in the L3VPN, and then the equipment in the EVPN can send the information to the equipment in the L3VPN according to the routing information. The scheme of the present disclosure can promote the application deployment of the EVPN new technology, enhance the network evolution and the flexible service expansion, and provide technical guarantee for ensuring the network evolution and the service sustainable development.
Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 illustrates a flow diagram of a method of processing routing information in accordance with some embodiments of the present disclosure.
Fig. 2 illustrates a schematic diagram of a network architecture of some embodiments of the present disclosure.
Fig. 3 shows a flow diagram of a method of processing routing information according to further embodiments of the present disclosure.
Fig. 4A illustrates a schematic diagram of routing information forwarding according to some embodiments of the present disclosure.
Fig. 4B shows a schematic diagram of routing information forwarding of further embodiments of the present disclosure.
Fig. 5 illustrates a schematic diagram of the structure of an ASBR of some embodiments of the present disclosure.
Fig. 6 shows a schematic structural diagram of an ASBR of other embodiments of the present disclosure.
Fig. 7 shows a schematic structural diagram of an ASBR of further embodiments of the present disclosure.
Fig. 8 illustrates a schematic architecture of a processing system of routing information for some embodiments of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
The present disclosure proposes a method for implementing BGP EVPN interworking with a conventional BGP L3VPN network. Aiming at the application scenes that the existing old IP network adopts an L3VPN deployment mode and the newly built IP network adopts a BGP EVPN deployment mode, no related mature scheme and technical standard exist at present, the problems of intercommunication of the traditional network and the new network networking service and the like exist, an EVPN-based new technology deployment network and the traditional network L3VPN network intercommunication method are provided, the BGP L3VPN and EVPN three-layer routing mutual conductance conversion rule and function requirements are defined, the application deployment of the EVPN new technology is promoted, and the network evolution and the service flexible expansion are enhanced. The following description is made with reference to fig. 1 to 3.
Fig. 1 is a flow chart of some embodiments of a method of processing routing information of the present disclosure. As shown in fig. 1, the method of this embodiment includes: steps S102 to S106.
In step S102, a first ASBR (Autonomous System Boundary Router, autonomous system border router) receives first route publication information sent by a second ASBR.
The first ASBR is an ASBR of an EVPN and the second ASBR is an ASBR of an L3VPN. In BGP-based networks, devices may publish routing information to peers through BGP messages, i.e., through route publication information, to peers, which is a technology of the prior art, so that the form and content of the first route publication information may refer to the prior art, where the first route publication information includes: VPNv4 or VPNv6Unicast (Unicast) routing information of the devices in the L3VPN, for example, includes routing information of CE (Customer Edge device), PE (Provider Edge device) in the L3VPN.
In some embodiments, the first ASBR and the second ASBR establish an MP-BGP neighbor relationship such that the first ASBR supports VPNv4 or VPNv6unicast address families; and the PE in the first ASBR and the EVPN establishes MP-BGP (Multi Protocol-BGP) neighbor relation so that the first ASBR supports the EVPN address family. And PE in the second ASBR and the L3VPN establishes MP-BGP neighbor relation, so that the second ASBR supports VPNv4 or VPNv6unicast address family. Since the second ASBR is an old network device and does not support EVPN address family capability, and the first ASBR is a new network device, it is possible to use the old technology to support both EVPN address family capability and VPNv4 or VPNv6unicast address family capability, so that MP-BGP neighbors between the first ASBR and the second ASBR enable VPNv4 or VPNv6unicast address family capability. For example, as shown in fig. 2, the conventional network adopts an L3VPN technology, the new network adopts an EVPN technology, and network interworking is implemented between the first ASBR and the second ASBR by adopting the L3VPN technology, and the first ASBR supports both the L3VPN technology and the EVPN technology.
In some embodiments, the L3VPN may be a 4G network and the EVPN may be a 5G network. Between the L3VPN network and the ABSR, the private network route is encapsulated in the VPNv4 or VPNv6unicast (afi =1/2, safi=128) address family, issued by MP-BGP neighbor learning, and in EVPN, the private network route is encapsulated in the EVPN (afi =25, safi=70) address family, issued by MP-BGP neighbor learning. The device supports the EVPN technology in the new network, and needs to support both the traditional L3VPN and EVPN functions in the first ASBR of the edge device.
In step S104, the first ASBR converts the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into EVPN routing information, and generates second route distribution information.
In some embodiments, the first ASBR converts VPNv4 or VPNv6unicast routing information of the device in the L3VPN into EVPN routing information according to a format of the VPNv4 or VPNv6unicast routing information in the NLRI (Network Layer Reachability Information, network layer reachability message) and a format of the EVPN routing information in the NLRI. The first route distribution information includes NLRI, and as shown in table 1, the format of VPNv4 or VPNv6unicast route information in NLRI includes: label field, occupy 3octets, RD (Route Identifier) field, occupy 8octets, prefix field, length variable.
TABLE 1
Label(3octets)
RD(8octets)
Prefix(variable)
The second route distribution information contains NLRI, and as shown in table 2, the format of EVPN route information (RT 5) in NLRI includes: RD field, 8octets,Ethernet Segment Identifier (ethernet segment identifier) field, 10octets,Ethernet Tag ID (ethernet tag ID) field, 4octets,IP Prefix Length (IP prefix length) field, 1octets,IP Prefix field, 4 or 16octets,GW IP Address (gateway IP address) field, 4 or 16octets,MPLS Label field, 3 ottes.
TABLE 2
RD(8octets)
Ethernet Segment Identifier(10octets)
Ethernet Tag ID(4octets)
IP Prefix Length(1octet)
IP Prefix(4or 16octets)
GW IP Address(4or 16octets)
MPLS Label(3octets)
As shown in tables 1 and 2, EVPN route is a part of information more in NRLI than VPNv4 or VPNv6unicast route, and mainly includes three fields of Ethernet Segment Identifier, ethernet Tag ID, GW IP Address. These three fields are not necessary, and are used as forwarding information in a specific scenario, and when both Ethernet Segment Identifier and GW IP Address are 0, the EVPN route next-hop attribute is used as forwarding information, which are respectively referred to as:
l3EVPN over ESI: when Ethernet Segment Identifier is not 0.
L3EVPN over GW-IP: when Ethernet Segment Identifier is 0, GW IP Address is not 0.
L3EVPN over PE-IP: when Ethernet Segment Identifier and GW IP Address are both 0.
MPLS Label, RD, IP Prefix in EVPN routes and Label, RD, prefix in VPNv4 or VPNv6unicast routes are in one-to-one correspondence.
In some embodiments, the first ASBR converts the RD corresponding to the VPNv4 or VPNv6unicast routing information of the device in the L3VPN to the RD corresponding to the EVPN routing information in the NLRI; converting a label corresponding to VPNv4 or VPNv6unicast routing information of equipment in the L3VPN in NLRI into an MPLS label corresponding to EVPN routing information in NLRI; converting the prefix corresponding to the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the IP prefix length and the IP prefix corresponding to the EVPN routing information in the NLRI; and filling the Ethernet segment identifier field, the Ethernet tag ID field and the gateway IP address field corresponding to the EVPN routing information in the NLRI with 0. As shown in table 3, the VPNv4 or VPNv6unicast route is converted into the EVPN route.
TABLE 3 Table 3
In some embodiments, the first ASBR inherits other attributes and routing conversion rules than NLRI in the first routing information to generate the second routing information. Because the EVPN route carries more forwarding information than the traditional VPNv4 or VPNv6unicast route, the EVPN route is necessarily constrained by the conversion operation, otherwise, information loss occurs after conversion. At present, the encapsulation type of the L3EVPN over PE-IP+MPLS tunnel and the VPNv4 or VPNv6unicast route are naturally and losslessly converted. On the premise, other attributes of the route are inherited one by one after route conversion, and the receiving and transmitting rules of the route are inherited one by one. The first ASBR receives the VPNv4 or VPNv6unicast route from the second ASBR, and after converting to the EVPN route, is completely equivalent to receiving the EVPN route from the second ASBR.
In step S106, the first ASBR transmits the second route distribution information into the EVPN so that devices in the EVPN learn route information of devices in the L3VPN.
For example, the first ASBR converts the VPNv4 or VPNv6unicast route in the 4G network (L3 VPN) into an EVPN route and publishes it into the 5G network (EVPN).
The information on which the VPNv4 or VPNv6 unified route is actually forwarded is the next-hop attribute, and iterates to the public network MPLS tunnel through the next-hop address under the default condition, and the conventional network does not support carrying the tunnel encapsulation attribute at present, namely the type of the public network tunnel which can not be walked by the VPN service appointed by the downstream PE equipment. The EVPN route may also carry a tunnel encapsulation attribute that explicitly indicates the public network tunnel type (e.g., vxlan tunnel, MPLS tunnel, SRv tunnel, etc.).
In the method of the foregoing embodiment, after receiving the first route distribution information sent by the second ASBR set in the L3VPN, the first ASBR set in the EVPN converts the VPNv4 or VPNv6unicast route information of the device in the L3VPN into the EVPN route information, generates the second route distribution information, and then sends the second route distribution information to the EVPN. Because the conversion of the VPNv4 or VPNv6unicast routing information and the EVPN routing information is realized, the equipment in the EVPN can learn the routing information of the equipment in the L3VPN, and then the equipment in the EVPN can send the information to the equipment in the L3VPN according to the routing information. The scheme of the embodiment can promote the application deployment of the EVPN new technology, enhance the network evolution and the flexible service expansion, and provide technical guarantee for ensuring the network evolution and the service sustainable development.
Further embodiments of a flow chart of a method of processing routing information of the present disclosure are described below in conjunction with fig. 3. As shown in fig. 3, the method of this embodiment includes: steps S302 to S306.
In step S302, the first ASBR receives the third route distribution information sent by the PE in the EVPN.
The third route publication information includes: the EVPN routing information of the device in the EVPN includes, for example, the routing information of the CE and the PE in the EVPN. The form and content of the third route distribution information may refer to the prior art.
In step S304, the first ASBR converts the EVPN routing information of the device in the EVPN into VPNv4 or VPNv6unicast routing information, and generates fourth route distribution information.
In some embodiments, the first ASBR converts EVPN routing information of devices in the EVPN to VPNv4 or VPNv6unicast routing information according to a format of the VPNv4 or VPNv6unicast routing information in the NLRI and a format of the EVPN routing information in the NLRI.
In some embodiments, the first ASBR deletes an ethernet segment identifier field, an ethernet tag ID field, and a gateway IP address field corresponding to EVPN routing information of the device in the EVPN in the NLRI; converting RD corresponding to EVPN route information of equipment in the EVPN in NLRI into RD corresponding to VPNv4 or VPNv6unicast route information in NLRI; converting the corresponding MPLS label of the EVPN route information of the equipment in the EVPN in the NLRI into the corresponding label of the VPNv4 or VPNv6unicast route information in the NLRI; and converting the IP prefix length and the IP prefix corresponding to the EVPN routing information of the equipment in the EVPN in the NLRI into the prefix corresponding to the VPNv4 or VPNv6unicast routing information in the NLRI. As shown in table 4, the EVPN route is converted into a VPNv4 or VPNv6unicast route.
TABLE 4 Table 4
In some embodiments, the first ASBR inherits other attributes and routing conversion rules than NLRI in the third routing information to generate the fourth routing information. The first ASBR receives the EVPN route from the PE and converts to a VPNV4/6unicast route, which is completely equivalent to receiving the VPNV4/6unicast route from the PE.
In step S306, the first ASBR transmits the fourth route distribution information to the second ASBR so that the second ASBR distributes the fourth route distribution information in the L3VPN.
In some embodiments, in the case of an end-to-end tunnel formed between a PE in the EVPN and a PE in the L3VPN, the first ASBR does not change the next hop when generating the second route publication information; under the condition that an end-to-end tunnel cannot be formed between PE in the EVPN and PE in the L3VPN, when the second route release information is generated, the first ASBR changes the next hop into the first ASBR, and multi-section tunnel splicing is achieved.
For example, an end-to-end tunnel is formed between a PE in the EVPN and a PE in the L3VPN, and the ASBR device cannot change the VPN route next-hop attribute when the VPN route is released. If the first ASBR device issues the converted VPN route, the issuing rule of the route is completely inherited, if the L3VPN network and the EVPN network are in the same AS domain, the next hop of the issuing route is unchanged by default, and if the first ASBR device is not in the same AS domain, the next hop of the issuing route can be kept unchanged by configuring a strategy.
For example, when the L3VPN and EVPN are isolated at the public network layer and an end-to-end tunnel cannot be formed, when the ASBR device issues a VPN route, the next hop attribute of the VPN route needs to be changed to be self, so as to realize multi-segment tunnel splicing. (of course, the next hop is not changed, and the multi-segment tunnel splicing is realized by iteration to BGP-LU routing). If the default rule does not meet the requirement of next hop change, the next hop of the release route can be forcedly changed through configuration strategies. If a plurality of sections of tunnels of different types need to be spliced, the first ASBR is required to carry the attribute related to the new tunnel depending on a configuration strategy when issuing the route.
After receiving the third route release information sent by the PE in the EVPN, the first ASBR in the method in the above embodiment converts the EVPN route information of the device in the EVPN into VPNv4 or VPNv6unicast route information, generates fourth route release information, and then sends the fourth route release information to the L3VPN by the second ASBR. Because the conversion of the EVPN route information and the VPNv4 or VPNv6unicast route information is realized, the equipment in the L3VPN can learn the route information of the equipment in the EVPN, and then the equipment in the L3VPN can send the information to the equipment in the EVPN according to the route information. The scheme of the embodiment can promote the application deployment of the EVPN new technology, enhance the network evolution and the flexible service expansion, and provide technical guarantee for ensuring the network evolution and the service sustainable development.
The present solution is theoretically without any modification of the forwarding plane, and some application examples of the present solution are shown in fig. 4A and 4B.
As shown in fig. 4A, nh represents the next hop, inlabel is the inner label, outlabel is the outer label. The 4G network deploys the L3VPN, the public network deploys the EVPN by using an MPLS tunnel, the 4G network and the 5G network are isolated by the public network, and the ASBR changes the next hop when advertising the route. After deployment in this way, on the PE device and the ASBR device, the private network route tag table entry and forwarding flow are as shown in fig. 4A, the CE2 issues the route of 192.1.1.1, the CE1 sends the traffic flow to 192.1.1.1, the PE1 encapsulates the inner layer tag 100 and encapsulates the outer layer tag to send to P, the P performs outer layer tag exchange and forwards to the ASBR1 (corresponding to the second ASBR of the foregoing embodiment), the ASBR1 terminates the outer layer tag and changes the inner layer tag to 101, sends to the ASBR2 (corresponding to the first ASBR of the foregoing embodiment), the ASBR2 changes the inner layer tag 102 and encapsulates the outer layer tag, sends to the PE2, and the PE2 removes the tag and sends the traffic flow to the CE2.
As shown in fig. 4B, the 4G network deploys the L3VPN, the public network deploys the EVPN using the MPLS tunnel, the public network deploys the MPLS tunnel, the 4G network and the 5G network, the public network is not isolated, and the ASBR does not change the next hop when advertising the route. After deployment in this way, the PE device has private network routing and label entries, and on the intermediate ASBR device, only the control plane has private network routing tables. When the traffic is forwarded in the public network, the labels of the private network of the inner layer are not changed, and the traffic is forwarded through the label exchange of the public network of the outer layer. CE2 issues a 192.1.1.1 route, CE1 sends traffic to 192.1.1.1, PE1 encapsulates inner label 102 and encapsulates tunnel label to P, P forwards to ASBR1 (corresponding to the second ASBR of the previous embodiment), ASBR1 forwards information to ASBR2 (corresponding to the first ASBR of the previous embodiment), ASBR2 forwards to PE2, PE2 de-labels traffic to CE2.
The present disclosure also provides an autonomous system border router, described below in connection with fig. 5.
Fig. 5 is a block diagram of some embodiments of an autonomous system border router of the present disclosure. As shown in fig. 5, the ASBR50 of this embodiment, as a first ASBR, includes: a receiving module 510, a converting module 520, and a transmitting module 530.
The receiving module 510 is configured to receive first route distribution information sent by a second ASBR, where the first ASBR is an ASBR of an ethernet virtual private network EVPN, the second ASBR is an ASBR of a three-layer virtual private network L3VPN, and the first route distribution information includes: the VPNv4 or VPNv6unicast routing information of the device in the L3VPN.
The conversion module 520 is configured to convert the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into EVPN routing information, and generate second routing release information.
A sending module 530, configured to send the second route distribution information to the EVPN, so that the device in the EVPN learns the route information of the device in the L3VPN.
In some embodiments, the receiving module 510 is further configured to receive third route distribution information sent by the operator edge device PE in the EVPN, where the third route distribution information includes: EVPN routing information of devices in the EVPN; the conversion module 520 is further configured to convert EVPN routing information of a device in the EVPN into VPNv4 or VPNv6unicast routing information, and generate fourth route distribution information; the sending module 530 is further configured to send the fourth route distribution information to the second ASBR, so that the second ASBR distributes the fourth route distribution information in the L3VPN.
In some embodiments, the conversion module 520 is configured to convert the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into the EVPN routing information according to a format of the VPNv4 or VPNv6unicast routing information in the network layer reachability message NLRI and a format of the EVPN routing information in the NLRI. Or, the conversion module 520 is configured to convert the EVPN routing information of the device in the EVPN into VPNv4 or VPNv6unicast routing information according to the format of the VPNv4 or VPNv6unicast routing information in the NLRI and the format of the EVPN routing information in the NLRI.
In some embodiments, the conversion module 520 is configured to convert a route identifier RD corresponding to VPNv4 or VPNv6unicast route information of a device in the L3VPN into an RD corresponding to EVPN route information in the NLRI; converting a label corresponding to VPNv4 or VPNv6unicast routing information of equipment in the L3VPN in NLRI into a multiprotocol label switching MPLS label corresponding to EVPN routing information in NLRI; converting the prefix corresponding to the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the IP prefix length and the IP prefix corresponding to the EVPN routing information in the NLRI; and filling the Ethernet segment identifier field, the Ethernet tag ID field and the gateway IP address field corresponding to the EVPN routing information in the NLRI with 0.
In some embodiments, the conversion module 520 is configured to delete an ethernet segment identifier field, an ethernet tag ID field, and a gateway IP address field corresponding to EVPN routing information of a device in the EVPN in the NLRI; converting RD corresponding to EVPN route information of equipment in the EVPN in NLRI into RD corresponding to VPNv4 or VPNv6unicast route information in NLRI; converting the corresponding MPLS label of the EVPN route information of the equipment in the EVPN in the NLRI into the corresponding label of the VPNv4 or VPNv6unicast route information in the NLRI; and converting the IP prefix length and the IP prefix corresponding to the EVPN routing information of the equipment in the EVPN in the NLRI into the prefix corresponding to the VPNv4 or VPNv6unicast routing information in the NLRI.
In some embodiments, the conversion module 520 is further configured to inherit other attributes and routing conversion rules other than NLRI in the first routing information to generate the second routing information; alternatively, the conversion module 520 is further configured to inherit other attributes and routing conversion rules except the NLRI in the third route distribution information to generate the fourth route distribution information.
In some embodiments, the first ASBR and the second ASBR establish an MP-BGP neighbor relationship such that the first ASBR supports VPNv4 or VPNv6unicast address families; and the PE in the first ASBR and the EVPN establishes MP-BGP neighbor relation, so that the first ASBR supports the EVPN address family.
In some embodiments, the conversion module 520 is further configured to, in a case where an end-to-end tunnel is formed between the PE in the EVPN and the PE in the L3VPN, not change the next hop when generating the second route distribution information; under the condition that an end-to-end tunnel cannot be formed between PE in the EVPN and PE in the L3VPN, changing the next hop into the first ASBR when generating the second route release information, and realizing multi-segment tunnel splicing.
The autonomous system border router in embodiments of the present disclosure may be implemented by various computing devices or computer systems, described below in conjunction with fig. 6 and 7.
Fig. 6 is a block diagram of some embodiments of an autonomous system border router of the present disclosure. As shown in fig. 6, the autonomous system border router 60 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610, the processor 620 being configured to perform the method of processing routing information in any of the embodiments of the present disclosure based on instructions stored in the memory 610.
The memory 610 may include, for example, system memory, fixed nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), database, and other programs.
Fig. 7 is a block diagram of further embodiments of an autonomous system border router of the present disclosure. As shown in fig. 7, the autonomous system border router 70 of this embodiment includes: memory 710 and processor 720 are similar to memory 610 and processor 620, respectively. Input/output interface 730, network interface 740, storage interface 750, and the like may also be included. These interfaces 730, 740, 750, as well as the memory 710 and the processor 720, may be connected by a bus 760, for example. The input/output interface 730 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, etc. The network interface 740 provides a connection interface for various networking devices, such as may be connected to a database server or cloud storage server, or the like. Storage interface 750 provides a connection interface for external storage devices such as SD cards, U-discs, and the like.
The present disclosure also provides a processing system for routing information, described below in conjunction with fig. 8.
Fig. 8 is a block diagram of some embodiments of a processing system of routing information of the present disclosure. As shown in fig. 8, the system 8 of this embodiment includes: the ASBR50/60/70 of any of the preceding embodiments as a first ASBR50/60/70; and a second ASBR81 for transmitting the first route distribution information.
The second ASBR82 is also configured to receive fourth route publication information sent by the first ASBR. For example, the first ASBR and the second ASBR establish an MP-BGP neighbor relationship such that the first ASBR supports VPNv4 or VPNv6unicast address families.
In some embodiments, the system 8 further comprises: EVPN and L3VPN. The EVPN may further include, in addition to the first ASBR: the first PE82, the first CE83, and the like, and the L3VPN may further include, in addition to the second ASBR: a second PE84, a second CE85, and the like.
It will be appreciated by those skilled in the art that embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to enable any modification, equivalent replacement, improvement or the like, which fall within the spirit and principles of the present disclosure.

Claims (14)

1. A method of processing routing information, comprising:
the first Autonomous System Border Router (ASBR) receives first route release information sent by a second ASBR, wherein the first ASBR is an ASBR of an Ethernet Virtual Private Network (EVPN), the second ASBR is an ASBR of a three-layer virtual private network (L3 VPN), and the first route release information comprises: VPNv4 or VPNv6unicast routing information of the device in the L3 VPN;
the first ASBR converts the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information, and generates second routing release information;
the first ASBR sends the second route publication information into an EVPN so that devices in the EVPN learn route information of devices in the L3VPN.
2. The routing information processing method according to claim 1, further comprising:
the first ASBR receives third route release information sent by an operator edge device PE in an EVPN, where the third route release information includes: EVPN routing information of devices in the EVPN;
the first ASBR converts EVPN route information of the equipment in the EVPN into VPNv4 or VPNv6unicast route information, and generates fourth route release information;
the first ASBR sends the fourth route publication information to the second ASBR so that the second ASBR publishes the fourth route publication information in an L3VPN.
3. The method for processing routing information according to claim 2, wherein the converting, by the first ASBR, VPNv4 or VPNv6unicast routing information of a device in the L3VPN into EVPN routing information includes:
the first ASBR converts the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information according to the format of the VPNv4 or VPNv6unicast routing information in the network layer reachability message NLRI and the format of the EVPN routing information in the NLRI;
or, the first ASBR converting EVPN routing information of a device in the EVPN into VPNv4 or VPNv6unicast routing information includes:
and the first ASBR converts the EVPN routing information of the equipment in the EVPN into VPNv4 or VPNv6unicast routing information according to the format of the VPNv4 or VPNv6unicast routing information in the NLRI and the format of the EVPN routing information in the NLRI.
4. The routing information processing method according to claim 3, wherein the converting, by the first ASBR, the VPNv4 or VPNv6unicast routing information of the device in the L3VPN into the EVPN routing information according to the format of the VPNv4 or VPNv6unicast routing information in the NLRI and the format of the EVPN routing information in the NLRI includes:
the first ASBR converts a routing identifier RD corresponding to VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in NLRI into an RD corresponding to EVPN routing information in NLRI;
the first ASBR converts the label corresponding to the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the multiprotocol label switching MPLS label corresponding to the EVPN routing information in the NLRI;
the first ASBR converts the prefix corresponding to the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN in the NLRI into the IP prefix length and the IP prefix corresponding to the EVPN routing information in the NLRI;
the first ASBR populates 0 an ethernet segment identifier field, an ethernet tag ID field, and a gateway IP address field corresponding to the EVPN routing information in the NLRI.
5. The routing information processing method according to claim 3, wherein the converting, by the first ASBR, the EVPN routing information of the device in the EVPN into VPNv4 or VPNv6unicast routing information according to a format of the VPNv4 or VPNv6unicast routing information in the NLRI and a format of the EVPN routing information in the NLRI includes:
the first ASBR deletes an Ethernet segment identifier field, an Ethernet tag ID field and a gateway IP address field corresponding to EVPN routing information of the device in the EVPN in the NLRI;
the first ASBR converts RD corresponding to EVPN route information of the equipment in the EVPN in the NLRI into RD corresponding to VPNv4 or VPNv6unicast route information in the NLRI;
the first ASBR converts the corresponding MPLS label of the EVPN route information of the equipment in the EVPN in the NLRI into a label corresponding to the VPNv4 or VPNv6unicast route information in the NLRI;
the first ASBR converts the IP prefix length and the IP prefix corresponding to the EVPN routing information of the equipment in the EVPN in the NLRI into the prefix corresponding to the VPNv4 or VPNv6unicast routing information in the NLRI.
6. The method for processing routing information according to claim 2, wherein said generating the second routing release information includes:
the first ASBR inherits other attributes and route conversion rules except NLRI in the first route release information to generate second route release information;
alternatively, the generating the fourth route distribution information includes:
the first ASBR inherits other attributes and routing conversion rules except the NLRI in the third routing information to generate fourth routing information.
7. The routing information processing method according to claim 1, further comprising:
the first ASBR and the second ASBR establish MP-BGP neighbor relation, so that the first ASBR supports VPNv4 or VPNv6unicast address family;
and the PE in the first ASBR and the EVPN establishes an MP-BGP neighbor relation so that the first ASBR supports the EVPN address family.
8. The routing information processing method according to claim 1, further comprising:
under the condition that an end-to-end tunnel is formed between PE in EVPN and PE in L3VPN, the first ASBR does not change the next hop when generating second route release information;
under the condition that an end-to-end tunnel cannot be formed between PE in the EVPN and PE in the L3VPN, the first ASBR changes the next hop into the first ASBR when generating second route release information, and multi-section tunnel splicing is achieved.
9. An autonomous system border router, ASBR, wherein the ASBR is a first ASBR comprising:
the receiving module is configured to receive first route distribution information sent by a second ASBR, where the first ASBR is an ASBR of an ethernet virtual private network EVPN, the second ASBR is an ASBR of a three-layer virtual private network L3VPN, and the first route distribution information includes: VPNv4 or VPNv6unicast routing information of the device in the L3 VPN;
the conversion module is used for converting the VPNv4 or VPNv6unicast routing information of the equipment in the L3VPN into EVPN routing information and generating second routing release information;
and the sending module is used for sending the second route release information to the EVPN so that the equipment in the EVPN learns the route information of the equipment in the L3VPN.
10. The autonomous system border router ASBR of claim 9, wherein,
the receiving module is further configured to receive third route release information sent by an operator edge device PE in the EVPN, where the third route release information includes: EVPN routing information of devices in the EVPN;
the conversion module is further configured to convert EVPN routing information of a device in the EVPN into VPNv4 or VPNv6unicast routing information, and generate fourth routing release information;
the sending module is further configured to send the fourth route distribution information to the second ASBR, so that the second ASBR distributes the fourth route distribution information in an L3VPN.
11. An autonomous system border router, ASBR, wherein the ASBR is a first ASBR comprising:
a processor; and
a memory coupled to the processor for storing instructions that, when executed by the processor, cause the processor to perform the method of processing routing information according to any of claims 1-8.
12. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the steps of the method of any of claims 1-8.
13. A system for processing routing information, comprising: the autonomous system border router ASBR of any of claims 9-11 as a first ASBR; and
the second ASBR is used for sending the first route release information;
the second ASBR is an ASBR of a three-layer virtual private network L3VPN.
14. The routing information processing system of claim 13, wherein,
the second ASBR is further configured to receive fourth route publication information sent by the first ASBR;
the first ASBR and the second ASBR establish MP-BGP neighbor relation, so that the first ASBR supports VPNv4 or VPNv6unicast address families.
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