CN102137001B - Routing information exchange method, equipment and system - Google Patents
Routing information exchange method, equipment and system Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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- H—ELECTRICITY
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- H04L45/00—Routing or path finding of packets in data switching networks
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- H04L45/04—Interdomain routing, e.g. hierarchical routing
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Abstract
The embodiment of the invention provides a routing information exchange method, and also provides corresponding routing information exchange equipment and a corresponding routing information exchange system. The embodiment of the invention comprises that: a virtual customer edge (CE) module receives a message from a customer edge node connected with the virtual CE module, thereby obtaining first media access control (MAC) address information in the site of the customer edge node; the virtual CE module transmits first MAC address routing information carrying the first MAC address information to the other virtual CE modules in the same virtual private network by an extended routing protocol; and the virtual CE module receives second MAC address routing information carrying second MAC address information in the sites of the customer edge nodes connected with the other virtual CE modules in the same virtual private network from the other virtual CE modules by the extended routing protocol. Therefore, all the virtual CE modules of the same virtual private network (VPN) can exchange the MAC address routing information with one another by the routing protocol.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a device, and a system for exchanging routing information.
Background
Interconnection of cloud computing or data centers through a Virtual Private Network (VPN) based on client devices is a hot spot of current research. Currently, most researchers choose to perform cloud computing or data center interconnection Based on CPE-Based VPN under an access Network defined by broadband forum, where the access Network may be a TR101 Digital Subscriber Line (DSL) or Passive Optical Network (PON) access Network. In each cloud computing or data center, there are many virtual machines or node devices, each virtual machine or node device has a Media Access Control (MAC) address, and MAC address routing information composed of these MAC addresses needs to be exchanged between user edge nodes of the VPN based on the client device, and from a theoretical point of view, the user edge nodes may adopt an Intermediate System to Intermediate System (IS-IS) routing protocol to diffuse the MAC address routing information by using a flooding mechanism through an IS-IS multicast packet, for example, in a TR101 Access network, a process in which the user edge nodes in the VPN based on the client device adopt an IS-IS routing protocol to diffuse the MAC address routing information by using a flooding mechanism IS shown in fig. 1. Wherein the IP edge node shown in fig. 1 may be a Broadband Access Server (BRAS) or a Broadband Network Gateway (BNG).
However, the inventor of the present invention finds that, since the Access network does not support user multicast, the IS-IS multicast packet from the user edge node IS filtered by the Access node of the Access network, for example, the Access node may be a Digital Subscriber Line Access Multiplexer (DSLAM), so that MAC address routing information between the user edge nodes cannot be exchanged with each other through a routing protocol, and thus a VPN based on a client device cannot be established in the Access network.
Disclosure of Invention
The embodiment of the invention provides a method, equipment and a system for exchanging routing information.
A method of exchanging routing information, comprising: a virtual user edge CE module receives a message sent by a user edge node interconnected with the virtual user edge CE module, wherein the message carries first Media Access Control (MAC) address information in a site to which the user edge node belongs;
issuing first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same virtual private network with the virtual CE module through an extended routing protocol;
and receiving second MAC address routing information issued by the other virtual CE modules through an extended routing protocol, wherein the second MAC address routing information carries second MAC address information inside a site to which a user edge node connected with the other virtual CE modules belongs.
A customer edge node, comprising: a media access control address information obtaining unit, configured to obtain MAC address information inside a station to which the MAC address information belongs;
and the message sending unit is used for sending a message to the virtual CE module which is interconnected with the message sending unit, wherein the message carries the MAC address information.
A system for exchanging routing information, comprising: each virtual customer edge module is used for receiving a message sent by a customer edge node interconnected with the virtual customer edge module, wherein the message carries first Media Access Control (MAC) address information in a site to which the customer edge node belongs, issuing first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same virtual private network with the virtual CE module through an extended routing protocol, and receiving second MAC address routing information issued by the other virtual CE modules through the extended routing protocol, wherein the second MAC address routing information carries second MAC address information in the site to which the customer edge node connected with the other virtual CE modules belongs;
each user edge node is used for obtaining MAC address information in the site to which the user edge node belongs and sending a message to a virtual CE module which is interconnected with the user edge node, wherein the message carries the MAC address information.
In the embodiment of the invention, a virtual CE module receives a message sent by a user edge node interconnected with the virtual CE module, and the message carries first media access control MAC address information in a site to which the user edge node belongs, so that the virtual CE module obtains the first MAC address information, the virtual CE module issues the first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same VPN through an extended routing protocol, so that other virtual CE modules in the same VPN obtain the first MAC address information, the virtual CE module can also receive second MAC address routing information issued by other virtual CE modules in the same VPN through the extended routing protocol, and the virtual CE module obtains the second MAC address information because the second MAC address routing information carries second MAC address information in the site to which the user edge node connected with other virtual CE modules belongs, virtual CE modules within the same VPN are therefore able to exchange MAC address routing information with each other via a routing protocol.
Drawings
FIG. 1 is a diagram illustrating the diffusion of MAC routing address information among user edge nodes in the prior art;
FIG. 2 is a virtual private network model for data center interconnection in an embodiment of the present invention;
FIG. 3 is a flow chart diagram illustrating one embodiment of a method for exchanging routing information in an embodiment of the present invention;
FIG. 4 is a schematic diagram of the second virtual CE module 42 receiving and publishing routing information;
fig. 5 is a schematic diagram of the first virtual CE module 41 and the second virtual CE module 42 receiving and issuing the routing information;
fig. 6 is a flowchart illustrating another embodiment of a method for exchanging routing information according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating another embodiment of a method for exchanging routing information according to an embodiment of the present invention;
FIG. 8 is a flow chart illustrating another embodiment of a method for exchanging routing information in an embodiment of the present invention;
fig. 9-a is a schematic view of a communication between the first station 31 and the second station 32;
fig. 9-B is another schematic diagram of the communication between the first station 31 and the second station 32 in the network hierarchy model;
fig. 10-a is another schematic view of the communication between the first station 31 and the second station 32;
fig. 10-B is another schematic diagram of the communication between the first station 31 and the second station 32 in the network hierarchy model;
FIG. 11 is a schematic diagram of the logical structure of a virtual CE module in the embodiment of the present invention;
FIG. 12 is a schematic diagram of a logical structure of a PE node according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a logical structure of a customer edge node according to an embodiment of the present invention;
fig. 14 is a schematic logical structure diagram of a system for exchanging routing information according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for exchanging routing information, and also provides corresponding equipment and a corresponding system. The following are detailed below.
First, a VPN model for implementing data center interconnection in the embodiment of the present invention is described in detail, and since the VPN model for performing cloud computing interconnection or enterprise network interconnection is similar to the VPN model for performing data center interconnection, further description is omitted. VPN model for data Center interconnection as shown in fig. 2, comprising a Data Center (DC) interconnection network, a first data Center 21 located at a first server 11, a second data Center 22 located at a second server 12, and a third data Center 23 located at a third server 13, the first server 11, the second server 12, and the third server 13 are located at a first site 31, a second site 32, and a third site 33, and the first site 31, the second site 32 and the third site 33 belong to the same Virtual Private Network (VPN), it should be noted that, in a VPN model, a server may include any number of multiple data centers, each data center may include any number of node devices or virtual machines, and a site may include any number of multiple servers, and thus the VPN model is not limited to the structure shown in fig. 2.
The DC internetwork may be an operator network, the customer edge nodes are edge devices in the affiliated sites directly connected to the operator network, a customer edge node is always considered to be in a single site, the customer edge node is usually a router in the site or the three-layer switching device may even be a host.
In the VPN model shown in fig. 2, the customer edge node function of the customer edge node (i.e. the function of exchanging MAC address routing information between all customer edge nodes of the VPN) is moved up to the operator network node interconnected with the customer edge node, so that the operator network node includes a module for implementing the customer edge node function of the customer edge node, it should be noted that the connection relationship between the operator network node and the customer edge node may be a physical interconnection relationship or a logical interconnection relationship, i.e. there may be other devices between the operator network node and the customer edge node.
The module located at the network Node of the operator and used for implementing the function of the user Edge Node is referred to as a virtual user Edge (CE) module, the virtual CE module is mainly used for implementing the exchange of MAC address routing information among the virtual user Edge nodes, the network Node of the operator including the virtual CE module may be AN IP Edge Node located in the network of the operator, or AN Access Node (AN, Access Node) having AN Access function, or a sink Node having a sink function, but for convenience of description, the nodes including the virtual CE module are collectively referred to as a Provider Edge (PE, Provider Edge) Node.
In the VPN model shown in fig. 2, after the function of the customer edge node of the first customer edge node 61 is moved up to the first PE node 51 interconnected with the first customer edge node, the first customer edge node 61 can be simplified into a foolproof two-layer device (e.g., a two-layer switch), which facilitates the maintenance and management of the first customer edge node 61 by the operator, so that the customer edge node can be realized by using the existing two-layer switch. It should be noted that, the function of the customer edge node of the first customer edge node 61 may not be moved up to the first PE node 51 in theory, and the embodiment of the present invention may also be implemented, but this requires that all the customer edge nodes are upgraded to support the function of exchanging MAC address routing information between the customer edge nodes.
In the VPN model shown in fig. 2, the third user edge node 63 and the first PE node 51 are interconnected, the user edge node function of the third user edge node 63 is also moved up to the first PE node 51 so that the first PE node 51 further includes the third virtual CE module 43, also in the VPN model shown in fig. 2, the second user edge node 62 and the second PE node 52 are interconnected, the user edge node function of the second user edge node 62 is moved up to the second PE node 52 so that the second PE node 52 includes the second virtual CE module 42, and the second user edge node 62 and the third user edge node 63 are also set as one foolproof two-tier device.
Referring to fig. 3, an embodiment of a method for exchanging routing information according to an embodiment of the present invention includes:
301. receiving a message sent by a user edge node interconnected with the user edge node to obtain first media access control address information inside a site to which the user edge node belongs;
the virtual CE module located in the PE node may receive a packet sent by a user edge node interconnected with the PE node, and the packet carries first MAC address information inside a site to which the user edge node belongs, so that the virtual CE module may obtain the first MAC address information.
302. Issuing first media access control address routing information to other virtual user edge modules of the same virtual private network through an extended routing protocol;
after the virtual CE module receives a message sent by a user edge node interconnected with the virtual CE module and obtains first MAC address information from the message, the virtual CE module issues first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same VPN as the virtual CE module through an extended routing protocol (such as extended BGP or IS-IS).
The extended routing protocol refers to that a routing protocol message carries MAC address routing information. It should be noted that each virtual CE module has an address, the address of the virtual CE module is usually an independent address, and the address of the virtual CE module may be a MAC address or an IP address, but if the address is saved, the virtual CE module may also use the address of the PE node to which the virtual CE module belongs, and the address of the virtual CE module is called a next hop address in the MAC address routing information.
303. And receiving second media access control address routing information which is respectively issued by other virtual user edge modules in the same virtual private network through an extended routing protocol.
Because the MAC address routing information needs to be diffused among the virtual CE modules in the VPN through a routing protocol, each virtual CE module needs to receive second MAC address routing information issued by other virtual CE modules in the same VPN through an extended routing protocol, where the second MAC address routing information carries second MAC address information inside a site to which a user edge node connected to the other virtual CE modules belongs.
In this embodiment, the first and second MAC address identifiers are used only for distinguishing MAC address routing information with different contents, and do not have a limiting function.
It should be noted that the order relationship between this step and other steps in this embodiment is not limited, for example, this step may be implemented before step 301, or may be implemented before step 302.
It should also be noted that each virtual CE module in the virtual private network performs the steps described above.
In this embodiment, the virtual CE module obtains first MAC address information inside a site to which the customer edge node belongs by receiving a packet sent by the customer edge node interconnected with the virtual CE module, and then the virtual CE module issues first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same VPN by using an extended routing protocol, so that the other virtual CE modules obtain the first MAC address information, and the virtual CE module can also receive second MAC address routing information issued by the other virtual CE modules in the same VPN, respectively, by using the extended routing protocol, so as to obtain second MAC address information inside a site to which the customer edge node connected to the other virtual CE modules belongs, and therefore all the virtual CE modules in the same VPN can exchange MAC address routing information with each other by using the routing protocol.
Referring to the VPN model shown in fig. 2, a process of exchanging routing information between all virtual CE modules in a VPN through a routing protocol will be specifically described, where fig. 4 shows a schematic diagram of receiving and distributing routing information by the second virtual CE module 42, fig. 5 shows a schematic diagram of receiving and distributing routing information by the first virtual CE module 41 and the third virtual CE module 43, and referring to fig. 6, another embodiment of the method for exchanging routing information in an embodiment of the present invention includes:
601. receiving a message sent by a user edge node interconnected with the user edge node to obtain the media access control address information in a site to which the user edge node belongs;
each customer edge node at the site has a default virtual CE module address at the DC interconnect network, e.g., the first customer edge node 61 corresponds to the first virtual CE module 41 address and the second customer edge node 62 corresponds to the second virtual CE module 42 address. The virtual CE module may obtain the first MAC address information inside the site to which the user edge node interconnected with the virtual CE module belongs in two ways, specifically:
1) as for the VPN model shown in fig. 2, the second virtual CE module 42 located in the second PE node 52 may receive a routing protocol packet that the second user edge node 62 carries MAC address information, for example, the second virtual CE module 42 may receive an IS-IS routing protocol packet or a BGP routing protocol packet sent by the second user edge node 62, where the IS-IS routing protocol packet or the BGP routing protocol packet carries MAC address information inside the second site 32 to which the second user edge node 62 belongs, so that the second virtual CE module 42 obtains the MAC address information inside the second site 32 to which the second user edge node 62 belongs, and similarly, the first virtual CE module 41 and the third virtual CE module 43 located in the first PE node 51 may also receive routing protocol packets sent by the first user edge node 61 and the third user edge node 63 respectively, thereby obtaining MAC address information inside the first station 31 to which the first customer edge node 61 belongs and MAC address information inside the third station 33 to which the third customer edge node 63 belongs.
2) The virtual CE module can also receive the message sent by the user edge node interconnected with the virtual CE module, and obtains the MAC address information inside the site to which the connected user edge node belongs through MAC address learning.
602. Decapsulating the unicast message;
when a user edge node interconnected with a virtual CE module sends a routing protocol packet to the virtual CE module, in order to avoid filtering the routing protocol multicast packet by AN access node AN, the routing protocol packet sent by the user edge node may be a unicast IP packet in which a destination address is a virtual CE module address interconnected with the user edge node, for example, the routing protocol packet sent by the second user edge node 62 may be a unicast IP packet in which a destination address is a second virtual CE module 42 address, where the routing protocol multicast packet carries MAC address routing information, and after receiving the unicast IP packet, the virtual CE module decapsulates the unicast IP packet to obtain the routing protocol multicast packet, and further obtains the MAC address routing information carried by the routing protocol multicast packet.
The routing protocol multicast message sent by the user edge node to the virtual CE module interconnected with the user edge node may also be a unicast ETH message in which the destination address is the virtual CE module address interconnected with the user edge node, where the routing protocol multicast message carries MAC address routing information, and after receiving the unicast ETH message, the virtual CE module also decapsulates the unicast ETH message to obtain the routing protocol multicast message, and further obtains the MAC address routing information carried by the routing protocol multicast message.
It should be noted that the routing protocol packet sent by the user edge node may also be a unicast routing protocol packet (for example, a unicast IP packet or a unicast MAC frame) whose destination address is an address of a virtual CE module interconnected with the routing protocol packet, where the unicast routing protocol packet carries MAC address routing information, so that the virtual CE module directly decapsulates the unicast routing protocol packet, and can obtain the MAC address routing information carried by the unicast routing protocol packet.
603. Media access control address routing information is issued to other virtual user edge modules of the same virtual private network through an extended routing protocol;
the second virtual CE module 42 issues MAC address routing information to the first virtual CE module 41 and the third virtual CE module 43 through an extended routing Protocol (such as extended BGP or IS-IS), and taking an extended Border Gateway Protocol (BGP) as an example, the second virtual CE module 42 needs to extend that BGP carries "MAC, VPN ID, NH: second virtual CE module address 42 ", where MAC is MAC address information, i.e. in this example MAC address information obtained from the second customer edge node 62; the VPN identifier (VPN ID) may be identified by using an extended community attribute of BGP, for example, a Route Target (RT) to identify an unused VPN, or a Virtual Local Area Network (VLAN) or MPLS label to identify an unused VPN in order to solve a problem that a MAC address Route without a VPN may be repeated; the address of the site-attached virtual CE module is taken as a Next Hop address (NH, Next Hop) in the MAC address routing, for example, when the second virtual CE module 42 issues MAC address routing information to the first virtual CE module 41 and the third virtual CE module 43 through BGP, NH is the address of the second virtual CE module 42.
Similarly, the first virtual CE module 41 may also issue MAC routing information to the second virtual CE module 42 and the third virtual CE module 43 through the extended routing protocol, and the third virtual CE module 43 may also issue MAC routing information to the first virtual CE module 41 and the second virtual CE module 42 through the extended routing protocol, where the specific process of the extended routing protocol is as described above. Since the first virtual CE module 41 and the second virtual CE module 42 are in the same PE node, the first virtual CE module 41 may not issue MAC routing information to the second virtual CE module 42 through the extended routing protocol, and only need to exchange MAC addresses with each other within the same device.
604. And receiving the media access control address routing information which is respectively issued by other virtual user edge modules in the same virtual private network through an extended routing protocol.
The first virtual CE module 41 receives the MAC address routing information issued by the second virtual CE module 42 and the third virtual CE module 43 respectively through the extended routing protocol, similarly, the second virtual CE module 42 receives the MAC address routing information issued by the first virtual CE module 41 and the third virtual CE module 43 respectively through the extended routing protocol, the third virtual CE module 43 also receives the MAC address routing information issued by the first virtual CE module 41 and the second virtual CE module 42 respectively through the extended routing protocol, the process of issuing the MAC address routing information by all the virtual CE modules through the extended routing protocol is as described in step 603, it should be noted that, since the first virtual CE module 41 and the second virtual CE module 42 are in the same PE node, the first virtual CE module 41 may not issue MAC address routing information to the second virtual CE module 42 through the extended routing protocol, but only need to exchange respective MAC addresses with each other within the same device.
In this embodiment, when the routing protocol packet sent by the user edge node may be a unicast IP packet or a unicast ETH packet in which a destination address is a virtual CE module address interconnected with the user edge node, the virtual CE module may decapsulate the unicast packet to obtain the MAC address routing information, or the routing protocol packet sent by the user edge node may also be a unicast routing protocol packet (e.g., a unicast IP packet or a unicast MAC frame) carrying the MAC address routing information and having a destination address that is a virtual CE module address, so that the access node AN may avoid filtering the routing protocol multicast packet.
In the above two embodiments, the method for exchanging the routing information is described from the perspective of the virtual CE module, and in the following embodiments, the method for exchanging the routing information is described from the perspective of the customer edge node, referring to fig. 7, another embodiment of the method for exchanging the routing information in the embodiments of the present invention includes:
701. obtaining the media access control address information in the site;
the user edge node can learn and obtain the MAC address information in the affiliated station through the MAC address.
1) The MAC address information may be a MAC address of any node device or virtual machine within a site to which the customer edge node belongs.
2) However, considering that there are many node devices or virtual machines in the DC or enterprise network, each node device or virtual machine has a MAC address, and thus the total MAC address amount is large, the present invention proposes that the node devices or virtual machines in the DC or enterprise network may use virtual MAC addresses, and set the MAC address information to a virtual MAC address domain (or called virtual MAC address prefix) formed by aggregating virtual MAC addresses of all nodes in a site to which the user edge node belongs, where the virtual MAC address domain is only an address segment, which is a part of a virtual MAC address, and thus, the MAC forwarding tables of the virtual CE modules are greatly reduced. The specific process of converging the virtual MAC address domain is as follows:
the node devices inside the DC or enterprise network may be classified into at least one virtual MAC network management domain according to a region of a service object or a service provided by an operator, where prefixes of virtual MAC addresses of the node devices or virtual machines in the same virtual network management domain are the same, or masks of virtual MAC addresses of the node devices or virtual machines in the same virtual network management domain are the same, where the masks are represented by lengths, and may be positive masks, that is, represented by bit numbers with a high bit of 1, such as 4, representing F000-0000, or reverse masks, that is, represented by bit numbers with a low bit of 0, such as 4, representing FFFF-ff-FFF 0, where the reverse masks are used, and prefixes of virtual MAC addresses of the node devices inside the same DC or enterprise network are the same.
The virtual MAC address field is set as an address field with a mask, for example, the virtual MAC address field is identified by using a form of 00E0-2000-XXXX/16, wherein 'X' is a hexadecimal character from 0 to F, and '16' is the bit number of the mask, and the virtual MAC address field comprises a virtual MAC address space of 00E 0-2000-0000-00E 0-2000-FFFF.
It is assumed that the DC has three node devices or virtual machines, and the node devices or virtual machines inside the DC are classified into one virtual MAC network management domain, the prefixes of the virtual MAC addresses of these three node devices are all 00E0-1010, the virtual MAC addresses of the three node devices are 00E0-1010-0001/0, 00E0-1010-0002/0, 00E0-1010-0003/0 respectively, the user edge node of the site where the DC is located learns the virtual MAC addresses of the three node devices or the virtual machines through the MAC addresses, the user edge node learns that the mask code of the three node devices or the virtual machines is 16 by searching the longest prefix of the three virtual MAC addresses, the customer edge node aggregates the virtual MAC addresses of these three node devices or virtual machines into a virtual MAC address domain of 00E 0-1010-0000/16.
Further, suppose that the DC has three node devices or virtual machines, and the node devices or virtual machines inside the DC are set as a virtual MAC network management domain, the prefixes of the virtual MAC addresses of the three node devices are all 00E0-2000-1, the virtual MAC addresses of the three node devices or virtual machines are 00E0-2000-1001/0, 00E0-2000-1002/0, 00E0-2000-1003/0, the user edge node of the site where the DC is located learns the virtual MAC addresses of the three node devices or virtual machines through the MAC addresses, the user edge node learns that the mask of the three node devices or virtual machines is 8 by searching the longest prefix of the three virtual MAC addresses, the customer edge node aggregates the virtual MAC addresses of these three node devices or virtual machines into a virtual MAC address domain of 00E 0-2000-1000/8.
And the user edge node also reserves a certain virtual MAC address space in each virtual MAC address field as a broadcast virtual MAC address field, for example, the lower bits of the virtual MAC address are all '1' to represent the broadcast virtual MAC address of the corresponding field, for example, 00E0-2000-1FFF/12 represents the node broadcast address in the 00E0-2000-1XXX/12 field, and 00E0-2000-1XXX/12 represents the broadcast field of 00E0-2000-1 FFF/12.
702. And sending a message carrying the media access control address information in the affiliated site to a virtual user edge module interconnected with the virtual user edge module.
During preprocessing, the customer edge node will first set or obtain the default virtual CE module address connected to it.
The customer edge node may send a packet carrying MAC address information inside the affiliated station to a virtual customer edge module interconnected therewith, specifically, there are two ways:
1) in order to avoid filtering the routing protocol multicast message by the access node AN, the user edge node may send a unicast routing protocol message (for example, a unicast IP message or a unicast MAC frame) with a destination address of the virtual CE module address to the virtual CE module interconnected therewith, where the unicast routing protocol message carries the MAC address routing information, or the user edge node may also carry the routing protocol multicast message in a unicast IP message or a unicast ETH message with a destination address of the virtual CE module address, and carry the MAC address routing information in the routing protocol multicast message. The MAC address information may have two types as described in step 701, which are a MAC address or a virtual MAC address field, respectively;
2) and the user edge node can also utilize the message to carry MAC address information, and after the virtual CE module receives the message, the MAC address information carried by the message can be obtained through MAC address learning.
In this embodiment, in order to avoid filtering the routing protocol multicast packet by the access node AN, the user edge node can send a unicast routing protocol packet with a destination address being AN address of a virtual CE module interconnected with the user edge node through the routing protocol, or the routing protocol multicast message is carried in the unicast IP message or unicast ETH message with the destination address of the virtual CE module address interconnected with the routing protocol multicast message, and the user edge node can converge the obtained virtual MAC addresses of all node devices in the affiliated station into a virtual MAC address domain, so that the customer edge node need only send the virtual MAC address field to the virtual CE module to which it is connected, the virtual CE module only needs to issue MAC address routing information carrying virtual MAC addresses to other virtual CE modules, so that the routing interaction information amount is reduced, the routing forming time is reduced, and the capacity of an MAC routing forwarding table stored and maintained by the virtual CE module is reduced.
For convenience of understanding, the following describes in detail an interaction process between a virtual CE module and a customer edge node, and referring to fig. 8, another embodiment of the method for exchanging routing information in the embodiment of the present invention includes: in the present embodiment, reference is still made to the VPN model as shown in fig. 2, from the perspective of the second customer edge node 62, and the second virtual CE module 42.
801. The customer edge node sets or obtains a default virtual customer edge module address;
since a customer edge node has a default virtual CE module address, the second customer edge node 62 is pre-processed as follows: the default second virtual CE module 42 address to which it is interconnected is set or retrieved.
802. The user edge node obtains the media access control address information in the affiliated site through the media access control address learning;
the second customer edge node 62 obtains the MAC address information inside the second station 32 through MAC address learning. The MAC address information may be of two types, respectively MAC address or virtual MAC address field, as described in step 701 in the embodiment shown in fig. 7.
803. The user edge node sends a message containing third media access control address routing information to a virtual user edge module interconnected with the user edge node;
the second user edge node 62 composes the MAC address information inside the second site 32 and the address of the second user edge node 62 into third MAC address routing information, encapsulates the routing protocol packet containing the third MAC address routing information into a unicast IP packet or a unicast MAC frame with a destination address of the second virtual CE module 42, and sends the unicast IP packet or the unicast MAC frame to the second virtual CE module 42.
It should be noted that the second user edge node 62 may also bear the routing protocol multicast packet in a unicast IP packet or a unicast ETH packet whose destination address is a virtual CE module address interconnected with the second user edge node, where the routing protocol multicast packet carries the third MAC address routing information and sends the unicast IP packet or the unicast ETH packet to the second virtual CE module 42.
804. The virtual user edge module sends a routing protocol message containing fourth media access control address routing information to other virtual user edge modules in the same virtual private network through an extended routing protocol;
the second virtual CE module 42 obtains the MAC address information inside the second site 32 according to the received message carrying the third MAC address routing information, combines the MAC address information inside the second site 32 and the address of the second virtual CE module 42 into fourth MAC address routing information, and sends the routing protocol message containing the fourth MAC address routing information to other virtual CE modules in the same VPN, that is, the first virtual CE module 41 and the third virtual CE module 43, through the extended routing protocol. See step 603 of the embodiment shown in fig. 6 for a specific procedure for extending the routing protocol.
805. Other virtual user edge modules in the same virtual private network obtain the media access control address routing information.
After receiving the routing protocol packet containing the fourth MAC address routing information sent by the second virtual CE module 42 through the extended routing protocol, the first virtual CE module 41 and the third virtual CE module 43 may obtain the fourth MAC address routing information.
In this embodiment, the third and fourth identifiers are merely used to distinguish MAC address routing information with different contents, and do not have a limiting effect.
In this embodiment, the customer edge node and the virtual CE module can issue MAC address routing information through a routing protocol, so that the MAC address routing information can be diffused among all the virtual CE modules in the VPN.
Next, data communication between the first site 31 and the second site 32 in the VPN model shown in fig. 2 will be described, and fig. 9-a is a schematic diagram of communication between the first site 31 and the second site 32, which is described in detail as follows: the internetwork of the first site 31 and the first virtual CE module 41, and the internetwork of the second site 32 and the second virtual CE module 42 are ETH networks, and the DC internetwork is an MPLS network. The first server 11 may provide the MAC address information of the first site 31 to the first virtual CE module 41 by sending an ETH message to the first virtual CE module 41, the second server 12 may also provide the MAC address information of the second site 32 to the first virtual CE module 41 by sending an ETH message to the second virtual CE module 42, and the first virtual CE module 41 and the second virtual CE module 42 may implement routing information exchange by carrying a routing protocol message carrying MAC address routing information on an MPLS message. Fig. 9-B is a schematic diagram of the communication between the first station 31 and the second station 32 described by way of a network hierarchy model corresponding to fig. 9-a.
When the MAC address information is the MAC address of any node device within the site described with the first customer edge node 61, the forwarding table of the second virtual CE module 42 may be as shown in table 1,
table 1 forwarding table for second virtual CE module 42
When the MAC address information is a virtual MAC address domain, the forwarding table of the second virtual CE module 42 may be as shown in table 2,
table 2 forwarding table of the second virtual CE module 42
Fig. 10-a is a schematic diagram of the communication between the first station 31 and the second station 32, which is described in detail as follows: the internetwork of the first site 31 and the first virtual CE module 41, and the internetwork of the second site 32 and the second virtual CE module 42 are ETH networks, and the DC internetwork is an IP network. The first server 11 may provide the MAC address information of the first site 31 to the first virtual CE module 41 by sending an ETH message to the first virtual CE module 41, the second server 12 may also provide the MAC address information of the second site 32 to the first virtual CE module 41 by sending an ETH message to the second virtual CE module 42, and the first virtual CE module 41 and the second virtual CE module 42 may implement routing information exchange by carrying a routing protocol packet carrying MAC address routing information on an IP packet. Fig. 10-B is a schematic diagram of the communication of the first station 31 and the second station 32 described in the manner of a network hierarchy model corresponding to fig. 10-a.
When the MAC address information is the MAC address of any node device within the site described with the first customer edge node 61, the forwarding table of the second virtual CE module 42 may be as shown in table 3,
table 3 forwarding table for second virtual CE module 42
When the MAC address information is a virtual MAC address domain, the forwarding table of the second virtual CE module 42 may be as shown in table 4,
table 4 forwarding table of second virtual CE module 42
The forwarding table of the first virtual CE module 41 is similar to the forwarding table of the second virtual CE module 42, and is not described herein again.
Referring to fig. 11, an embodiment of the present invention further provides an embodiment of a virtual CE module, including:
a message processing unit 1101, where the virtual customer edge CE module receives a message sent by a customer edge node interconnected with the virtual customer edge CE module, where the message carries first MAC address information of media access control in a site to which the customer edge node belongs, and the message may be a routing protocol message or a message used by the virtual CE module to perform MAC address learning;
a MAC routing protocol processing unit 1102, which issues first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same virtual private network as the virtual CE module through an extended routing protocol; and receiving second MAC address routing information issued by other virtual CE modules through an extended routing protocol, wherein the second MAC address routing information carries second MAC address information inside a site to which a user edge node connected with other virtual CE modules belongs.
The MAC address information obtained by the virtual CE module is a media access control MAC address of any node device in the site to which the customer edge node belongs, or a virtual MAC address field aggregated by virtual MAC addresses of all node devices in the site to which the customer edge node belongs.
The virtual CE module may further include a media access control routing table processing module 1103, where the media access control routing table processing module 1103 is configured to store and maintain a MAC routing forwarding table, and implement a MAC routing forwarding function according to the MAC routing forwarding table.
In order to avoid filtering out a routing protocol multicast message by AN access node AN, the virtual CE module further includes a unicast message decapsulation processing unit 1104, configured to decapsulate the unicast IP message or the ETH message after receiving a routing protocol message sent by a user edge node interconnected with the routing protocol multicast message, where the routing protocol multicast message carries MAC address routing information when the routing protocol message sent by the user edge node is a unicast IP message or AN ETH message whose destination address is a virtual CE module address and the routing protocol multicast message is carried by the user edge node;
in order to avoid filtering out the routing protocol multicast packet by the access node AN, the unicast packet decapsulation processing unit 1104 is further configured to decapsulate the unicast packet after the step of receiving the routing protocol packet sent by the user edge node interconnected with the routing protocol unicast packet carrying the MAC address routing information when the routing protocol packet sent by the user edge node is a routing protocol unicast packet whose destination address is a virtual CE module address. The routing protocol unicast message may be a unicast IP message or a unicast MAC frame.
Referring to fig. 12, an embodiment of the present invention further provides an embodiment of a PE node including a virtual CE module, including:
at least one virtual user edge module 1201 in the embodiment shown in figure 11,
the PE node may also include an operator edge node processing unit 1202, the operator edge node processing unit 1202 for connecting with other PE nodes in the DC internetwork through the IP/MPLS/ETH network.
It should be noted that the virtual user edge module 1201 in this embodiment may be the same as the virtual user edge module shown in fig. 11, and the operator edge node processing unit 1202 and the mac routing table processing module 1103 in the virtual user edge module communicate with each other.
Referring to fig. 13, an embodiment of the present invention further provides an embodiment of a user edge node, including:
a unit 1301 for acquiring media access control address information, configured to enable a user edge node to acquire MAC address information inside a station to which the user edge node belongs;
a message sending unit 1302, configured to send a message to the virtual CE module interconnected with the message, where the message carries the MAC address information inside the station to which the user edge node belongs, and the message may be a routing protocol message or a message for enabling the virtual CE module interconnected with the message to perform MAC address learning.
The message sending unit 1302 may further include a message sending subunit 13021, where the message sending subunit 13021 is configured to send a routing protocol message to a virtual CE module interconnected with the message sending subunit, or a message used for the virtual CE module to perform MAC address learning.
In order to avoid the access node AN filtering the routing protocol multicast packet, the packet sending unit 1302 includes at least one of the following sub-units:
a unicast message processing subunit 13022, configured to combine the MAC address information of the internal site of the user edge node and the address of the user edge node, which are obtained by the user edge node, into routing information, and send a routing protocol unicast message containing the routing information to the virtual CE module, where the routing protocol unicast message may be a unicast IP message or a unicast MAC frame;
or,
a unicast packet encapsulation processing subunit 13023, configured to bear the routing protocol multicast packet in a unicast IP packet or an ETH packet whose destination address is a virtual CE module address, and send the unicast IP packet or the ETH packet to the virtual CE module.
When the MAC address information in the site to which the user edge node belongs is an MAC address, the MAC address information obtaining unit 1301 is configured to obtain an MAC address of any node in the site to which the user edge node belongs through MAC address learning, and then the message sending unit 1302 sends routing information carrying the MAC address of any node to the virtual CE node through a routing protocol, where one MAC address corresponds to one piece of routing information.
When the MAC address information in the site to which the user edge node belongs is a virtual MAC address domain, the MAC address information obtaining unit 1301 is configured to obtain virtual MAC addresses of all nodes in the site through MAC address learning; and converging the virtual MAC addresses of all the nodes to obtain a virtual MAC address domain.
Further, the unit 1301 for acquiring the MAC address information is configured to aggregate the virtual MAC addresses of all the nodes according to prefixes of the virtual MAC addresses, so as to obtain a virtual MAC address domain.
Referring to fig. 14, an embodiment of a system for exchanging routing information according to the present invention further includes:
each virtual customer edge module 1401 is configured to receive a packet sent by a customer edge node interconnected with the virtual customer edge module, where the packet carries first MAC address control information inside a site to which the customer edge node interconnected with the virtual customer edge module belongs, issue, by using an extended routing protocol, first MAC address routing information carrying the first MAC address information to other virtual CE modules in the same virtual private network, receive second MAC address routing information, which is issued by each of the other virtual CE modules in the same virtual private network by using the extended routing protocol, and carry second MAC address information inside a site to which the customer edge node connected to the other virtual CE modules in the same virtual private network belongs;
each of the at least two customer edge nodes 1402 is configured to obtain MAC address information inside a site to which the customer edge node belongs, and send a packet to a virtual CE module interconnected with the customer edge node, where the packet carries the MAC address information inside the site to which the customer edge node belongs.
In order to avoid filtering the routing protocol multicast packet by the access node AN, the system for exchanging routing information in this embodiment further has the following features:
the virtual customer edge module 1401 is further configured to, when a packet sent by a customer edge node interconnected with the virtual customer edge module is a unicast IP packet or an ETH packet whose destination address is a virtual CE module address interconnected with the customer edge node, after the step of receiving, by the virtual customer edge module, a packet sent by the customer edge node interconnected with the virtual customer edge module, further include: decapsulating the unicast IP message or the ETH message;
the user edge node 1402 is further configured to bear the routing protocol multicast packet in a unicast IP packet or an ETH packet whose destination address is an address of a virtual CE module interconnected with the routing protocol multicast packet, and send the unicast IP packet or the ETH packet to the virtual CE module through the routing protocol.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method, device and system for exchanging routing information provided by the embodiments of the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method of exchanging routing information, comprising:
a virtual user edge (CE) module in an operator edge (PE) node receives a unicast message sent by a user edge node interconnected with the CE module, wherein the unicast message carries first Media Access Control (MAC) address information in a site to which the user edge node belongs, the unicast message sent by the user edge node is a unicast IP message or a unicast ETH message with a destination address being the address of the virtual CE module, and a routing protocol multicast message is borne in the unicast IP message or the unicast ETH message;
a virtual CE module in the PE node issues first MAC address routing information carrying the first MAC address information to virtual CE modules in other PE nodes in the same virtual private network as the virtual CE module through an extended routing protocol, wherein the first MAC address routing information comprises the first MAC address information and an address of the virtual CE module, and the address of the virtual CE module is a next hop address in the first MAC address routing information;
and the virtual CE module in the PE node receives second MAC address routing information issued by the virtual CE modules in other PE nodes through an extended routing protocol, wherein the second MAC address routing information carries second MAC address information inside a site to which a user edge node connected with the virtual CE modules in other PE nodes belongs.
2. The method according to claim 1, wherein after the step of the virtual CE module receiving the unicast packet sent by the customer edge node interconnected with the virtual CE module, the method further comprises:
decapsulating the unicast IP packet or the unicast ETH packet.
3. The method according to any one of claims 1 to 2,
the MAC address information is a media access control MAC address of any node device in a site to which the user edge node belongs, or a virtual MAC address domain aggregated by virtual MAC addresses of all node devices in the site to which the user edge node belongs.
4. A customer edge node, comprising:
a media access control address information obtaining unit, configured to obtain MAC address information inside a station to which the MAC address information belongs;
a message sending unit, configured to send a unicast message to a virtual CE module interconnected with the packet sending unit, where the unicast message carries the MAC address information, where the unicast message is a unicast IP message or a unicast ETH message whose destination address is an address of the virtual CE module, and a routing protocol multicast message is carried in the unicast IP message or the unicast ETH message, and the virtual CE module is in a PE node.
5. The customer edge node according to claim 4, characterized in that the messaging unit further comprises at least one of the following sub-units:
a unicast message processing subunit, configured to compose routing information from the MAC address information and the address of the user edge node, package a routing protocol message including the routing information into a unicast IP message or a unicast MAC frame addressed to the virtual CE module, and send the unicast IP message or the unicast MAC frame to the virtual CE module through a routing protocol;
or,
and a unicast message encapsulation processing subunit, configured to bear a routing protocol multicast message in a unicast IP message or an ETH message whose destination address is the address of the virtual CE module, and send the unicast IP message or the ETH message to the virtual CE module through a routing protocol.
6. The customer edge node according to any of claims 4 to 5 wherein the MAC address information is a MAC address,
the media access control address information acquiring unit is used for acquiring the MAC address of any node device in the site to which the MAC address belongs through MAC address learning.
7. The customer edge node according to any of claims 4 to 5 wherein the MAC address information is a virtual MAC address field,
the media access control address information obtaining unit is used for obtaining virtual MAC addresses of all node devices in the site through MAC address learning, and converging the virtual MAC addresses of all the node devices to obtain a virtual MAC address domain.
8. The customer edge node of claim 7, wherein the MAC address information obtaining unit is configured to aggregate the virtual MAC addresses of all node devices according to prefixes of the virtual MAC addresses, so as to obtain a virtual MAC address domain.
9. A system for exchanging routing information, comprising:
each virtual customer edge module is used for receiving a unicast message sent by a customer edge node interconnected with the virtual customer edge module, the unicast message carries first Media Access Control (MAC) address information in a site to which the customer edge node belongs, first MAC address routing information carrying the first MAC address information is issued to other virtual CE modules in the same virtual private network with the virtual CE module through an extended routing protocol, second MAC address routing information issued by the other virtual CE modules through the extended routing protocol is received, the second MAC address routing information carries second MAC address information in the site to which the customer edge node connected with the other virtual CE modules belongs, and the first MAC address routing information comprises the first MAC address information and the address of the virtual CE module, the address of the virtual CE module is a next hop address in the first MAC address routing information;
each user edge node is used for obtaining MAC address information in a site to which the user edge node belongs and sending a unicast message to a virtual CE module which is interconnected with the user edge node, wherein the unicast message carries the MAC address information, the unicast message is a unicast IP message or a unicast ETH message of which the destination address is the address of the virtual CE module, a routing protocol multicast message is borne in the unicast IP message or the unicast ETH message, and the virtual CE module is in a PE node.
10. The system of claim 9,
after the step of receiving, by the virtual CE module, the packet sent by the customer edge node interconnected with the virtual CE module, the method further includes: decapsulating the unicast IP packet or the ETH packet;
the user edge node is also used for bearing the routing protocol multicast message in a unicast IP message or an ETH message of which the destination address is the address of the virtual CE module interconnected with the user edge node, and sending the unicast IP message or the ETH message to the virtual CE module interconnected with the user edge node through the routing protocol.
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| CN103716245B (en) * | 2012-09-29 | 2017-02-08 | 上海贝尔股份有限公司 | Edge router based on virtual special-purpose local area network |
| EP2922246B1 (en) * | 2012-12-06 | 2019-04-03 | Huawei Technologies Co., Ltd. | Method and data center network for cross-service zone communication |
| CN104703211B (en) * | 2013-12-04 | 2018-06-19 | 华为技术有限公司 | A kind of virtualization cut-in method and equipment |
| CN105337865B (en) * | 2014-06-03 | 2018-09-21 | 华为技术有限公司 | A kind of methods, devices and systems for establishing forwarding-table item |
| CN105227454B (en) * | 2014-06-18 | 2019-02-26 | 中兴通讯股份有限公司 | Virtual flow-line system and method |
| CN110224844B (en) * | 2019-07-26 | 2021-01-15 | 宙安科技河北有限公司 | Scheduling method and system of virtual private network |
| CN113364893B (en) * | 2020-03-06 | 2022-09-16 | 华为技术有限公司 | Data transmission method, device and system |
| CN112671579A (en) * | 2020-12-23 | 2021-04-16 | 安徽长泰信息安全服务有限公司 | Remote gateway management system based on cloud management |
| CN113518104B (en) * | 2021-03-11 | 2024-02-27 | 网宿科技股份有限公司 | Data message processing method, transfer equipment and system |
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