CN109995651B - Pseudo wire establishing method and device - Google Patents
Pseudo wire establishing method and device Download PDFInfo
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- CN109995651B CN109995651B CN201910241584.4A CN201910241584A CN109995651B CN 109995651 B CN109995651 B CN 109995651B CN 201910241584 A CN201910241584 A CN 201910241584A CN 109995651 B CN109995651 B CN 109995651B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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]
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- H04L45/00—Routing or path finding of packets in data switching networks
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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
- H04L45/68—Pseudowire emulation, e.g. IETF WG PWE3
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Abstract
The embodiment of the present disclosure provides a pseudowire establishing method, which is applied to a first PE device in a first dual homing unit in an EVPN networking, which needs to establish a primary pseudowire with a second dual homing unit, where the second dual homing unit includes a third PE device, which needs to establish the primary pseudowire with the first dual homing unit, and the method includes: sending the address information of the first PE device and the first main pseudo wire identifier to the second dual-homing unit, so that the third PE device establishes a main pseudo wire from the third PE device to the first PE device according to the address information of the first PE device and the first main pseudo wire identifier; receiving address information of the third PE equipment and a third main pseudo wire identifier returned by the third PE equipment; and establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier. Therefore, the main pseudo wires established by the PE equipment at the two ends are symmetrical, so that when fault detection is carried out through BFD, network faults cannot be detected, and the main pseudo wires are prevented from being idle.
Description
Technical Field
The present disclosure relates to the field of network communication technologies, and in particular, to a method and an apparatus for establishing a pseudo wire.
Background
EVPN (Ethernet Virtual Private Network) is a two-layer VPN (Virtual local area Network) technology.
In the EVPN, a CE (Customer Edge) device, a PE (Provider Edge) device, and a PW (Pseudowire) are included, where the CE device is a user network side device directly connected to a service Provider network, the PE device is a service Provider network side device connected to the CE, the PW is a virtual connection between two PE devices, and the PW can be divided into a main PW and a standby PW, and generally, data is transmitted through the main PW, and when the main PW fails, data is transmitted through the standby PW.
In practical application, a CE device may access to an EVPN networking in a dual-homing manner, that is, in an EVPN, for a CE device, two PE devices connected thereto may access to a networking, and the CE device and the two PE devices connected thereto may form a dual-homing unit.
When a PW is established, if two EVPN routing messages with the same ESI (Ethernet Segment Identifier) value are received by one PE device in a dual-homing unit, indicating that the two EVPN routing messages are sent by two PE devices in another dual-homing unit, in this case, the PE device establishes a primary PW and a standby PW with two PE devices in another dual-homing unit, respectively, wherein the determination of the primary PW and the standby PW is random.
Disclosure of Invention
An object of the embodiments of the present disclosure is to provide a pseudowire establishment method to avoid the problem that a primary pseudowire between PE devices is idle in EVPN. The specific technical scheme is as follows:
the embodiment of the disclosure provides a pseudowire establishing method, which is applied to a first PE device of a first dual-homing unit in an EVPN (event virtual private network) networking network, wherein the first PE device is a PE device which needs to establish a main pseudowire with a second dual-homing unit in the EVPN networking network, the second dual-homing unit comprises a third PE device, and the third PE device is a PE device which needs to establish the main pseudowire with the first dual-homing unit, and the method comprises the following steps:
sending address information of the first PE device to the second dual-homing unit, and a first primary pseudowire identifier indicating that the first PE device is a PE device needing to establish a primary pseudowire, so that the third PE device establishes the primary pseudowire from the third PE device to the first PE device according to the address information of the first PE device and the first primary pseudowire identifier;
receiving address information of the third PE device returned by the third PE device, and a third primary pseudo wire identifier indicating that the third PE device is a PE device needing to establish a primary pseudo wire;
and establishing a main pseudo wire from the first PE device to the third PE device according to the address information of the third PE device and the third main pseudo wire identifier.
Optionally, the first dual-homing unit further includes a second PE device;
the method further comprises the following steps:
and sending the address information of the second PE device and a second spare pseudo wire identifier indicating that the second PE device is a PE device needing to establish a spare pseudo wire to the second dual-homing unit, so that the third PE device establishes the spare pseudo wire from the third PE device to the second PE device according to the address information of the second PE device and the second spare pseudo wire identifier.
Optionally, the second dual-homing unit further includes a fourth PE device;
after the sending the address information of the first PE device to the second dual homing unit, further comprising:
receiving address information of the fourth PE device returned by the fourth PE device, and a fourth standby pseudo wire identifier indicating that the fourth PE device is a PE device needing to establish a standby pseudo wire;
and establishing a standby pseudo wire from the first PE device to the fourth PE device according to the address information of the fourth PE device and the fourth standby pseudo wire identifier.
Optionally, the first dual-homing unit further includes a second PE device, and the first PE device is determined to be a PE device that needs to establish a primary pseudowire with the second dual-homing unit in the following manner:
receiving a routing message of the second PE device sent by the second PE device, wherein the routing message carries address information of the second PE device;
and when the address information of the second PE device and the address information of the first PE device meet a preset relationship, determining that the first PE device is a PE device which needs to establish a main pseudo wire with the second dual-homing unit.
Optionally, the sending, to the second dual-homing unit, the address information of the first PE device, and a first primary pseudowire identifier indicating that the first PE device is a PE device that needs to establish a primary pseudowire includes:
and sending the address information of the first PE equipment in the EVPN networking by adopting a broadcasting mode, and showing that the first PE equipment is a first main pseudo wire identifier of the PE equipment needing to establish a main pseudo wire.
The embodiment of the present disclosure further provides a pseudowire establishing apparatus, which is applied to a first PE device of a first dual homing unit in an EVPN networking, where the first PE device is a PE device that needs to establish a primary pseudowire with a second dual homing unit in the EVPN networking, the second dual homing unit includes a third PE device, the third PE device is a PE device that needs to establish a primary pseudowire with the first dual homing unit, and the apparatus includes:
a sending module, configured to send address information of the first PE device to the second dual-homing unit, and indicate that the first PE device is a first primary pseudowire identifier of a PE device that needs to establish a primary pseudowire, so that the third PE device establishes a primary pseudowire from the third PE device to the first PE device according to the address information of the first PE device and the first primary pseudowire identifier;
a receiving module, configured to receive address information of the third PE device returned by the third PE device, and a third primary pseudowire identifier indicating that the third PE device is a PE device that needs to establish a primary pseudowire;
and the establishing module is used for establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier.
Optionally, the first dual-homing unit further includes a second PE device;
the sending module is further configured to send address information of the second PE device to the second dual-homing unit, and indicate that the second PE device is a second backup pseudowire identifier of a PE device that needs to establish a backup pseudowire, so that the third PE device establishes the backup pseudowire from the third PE device to the second PE device according to the address information of the second PE device and the second backup pseudowire identifier.
Optionally, the second dual-homing unit further includes a fourth PE device;
the receiving module is further configured to receive address information of the fourth PE device returned by the fourth PE device, and a fourth spare pseudo wire identifier indicating that the fourth PE device is a PE device that needs to establish a spare pseudo wire;
the establishing module is further configured to establish a spare pseudo wire from the first PE device to the fourth PE device according to the address information of the fourth PE device and the fourth spare pseudo wire identifier.
Optionally, the first dual-homing unit further includes a second PE device; the device further comprises: a determination module;
the receiving module is further configured to receive a routing message of the second PE device sent by the second PE device, where the routing message carries address information of the second PE device;
the determining module is further configured to determine that the first PE device is a PE device that needs to establish a primary pseudowire with the second dual-homing unit when the address information of the second PE device and the address information of the first PE device satisfy a preset relationship.
Optionally, the sending module is further configured to:
and sending the address information of the first PE equipment in the EVPN networking by adopting a broadcasting mode, and showing that the first PE equipment is a first main pseudo wire identifier of the PE equipment needing to establish a main pseudo wire.
The embodiment of the disclosure also provides an electronic device, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing any one of the pseudo wire establishing methods when executing the program stored in the memory.
The embodiment of the present disclosure further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the pseudowire establishment method is implemented.
Embodiments of the present invention further provide a computer program product containing instructions, which when run on a computer, cause the computer to execute any of the above-mentioned pseudowire establishment methods.
The pseudo wire establishing method and device provided by the embodiment of the disclosure are applied to a first PE device of a first dual homing unit in an EVPN networking, wherein the first PE device is a PE device which needs to establish a primary pseudo wire with a second dual homing unit in the EVPN networking, the second dual homing unit comprises a third PE device which is a PE device which needs to establish the primary pseudo wire with the first dual homing unit, firstly, address information of the first PE device is sent to the second dual homing unit, and a first primary pseudo wire identifier which represents that the first PE device is the PE device which needs to establish the primary pseudo wire is sent, so that the third PE device establishes the primary pseudo wire from the third PE device to the first PE device according to the address information of the first PE device and the first primary pseudo wire identifier, then, address information of the third PE device returned by the third PE device is received, and the third primary pseudo wire identifier which represents that the third PE device is the PE device which needs to establish the primary pseudo wire is shown, and establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier.
Therefore, for the first PE device, it can be ensured that the first PE device establishes a main pseudowire to the third PE device under the condition that the main pseudowire is established from the third PE device to the first PE device, that is, the main pseudowires established from the PE devices at both ends are symmetrical, so that when performing fault detection through BFD, a network fault cannot be detected, and thus the main pseudowire can be prevented from being idle. Of course, not all advantages described above need to be achieved at the same time to practice any one product or method of the present disclosure.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram illustrating an establishment of a primary PW and a standby PW between dual-homed PE devices in an EVPN in the related art;
fig. 2 is a schematic flowchart of a pseudowire establishing method according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a method for establishing a pseudo wire in an EVPN networking network according to the method provided by the embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a pseudo wire establishing apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic view of an electronic device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 1, as a schematic diagram of establishing a main PW and a standby PW between a PE device in one dual-homing unit and a PE device in another dual-homing unit in an EVPN in the related art, a first dual-homing unit includes CE1, PE1, and PE2, CE1 is connected to PE1 and PE2, respectively, a second dual-homing unit includes CE2, PE3, and PE4, and CE2 is connected to PE3 and PE4, respectively, where the main PW is a PW from PE2 to PE4 for the PE2 device, the standby PW is a PW from PE2 to PE3 for the PE4 device, the main PW is a PW from PE2 to PE1, and the standby PW is a PW from PE2 to PE2 for the PE4 device.
Generally, fault Detection is performed in an EVPN through a Bidirectional Forwarding Detection (BFD) mechanism, a BFD session between two devices is established, a device at one end transmits BFD Detection messages according to a preset interval, a device at the other end receives the BFD Detection messages and replies response messages to the device transmitting the BFD Detection messages, and then the device transmitting the BFD Detection messages can detect a network condition according to message receiving time, and if the reception is overtime, it indicates that the network transmits a fault.
However, in the case shown in fig. 1, when performing BFD detection, PE2 will send a BFD detection message to PE4 through the main PW, and the reply message of PE4 will reply to PE1 through the main PW, so that when performing BFD detection, because bidirectional forwarding paths of the BFD detection messages are not consistent, it is likely that the message receiving time between PE2 and PE4 is over time, and the main PW with detection results from PE2 to PE4 is in a defect state, and is idle.
In order to solve the above technical problem, the present disclosure provides a pseudowire establishing method, which may be applied to a first PE device of a first dual homing unit in an EVPN networking, where the first PE device is a PE device that needs to establish a primary pseudowire with a second dual homing unit in the EVPN networking, the second dual homing unit includes a third PE device, and the third PE device is a PE device that needs to establish a primary pseudowire with the first dual homing unit, where the first PE device may be a computer, a base station, a router, and the like, and this is not limited in this disclosure.
The pseudowire establishment methods provided by embodiments of the present disclosure are generally described below.
In one implementation, the pseudowire establishing method includes:
sending the address information of the first PE equipment to the second dual-homing unit, and indicating that the first PE equipment is a first main pseudo wire identifier of the PE equipment needing to establish the main pseudo wire, so that the third PE equipment establishes the main pseudo wire from the third PE equipment to the first PE equipment according to the address information of the first PE equipment and the first main pseudo wire identifier;
receiving address information of the third PE device returned by the third PE device, and indicating that the third PE device is a third main pseudo wire identifier of the PE device needing to establish the main pseudo wire;
and establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier.
As can be seen from the above, the pseudowire establishing method provided in the embodiment of the present disclosure can ensure that, for a first PE device, when a main pseudowire is established from a third PE device to the first PE device, the main pseudowire is also established from the first PE device to the third PE device, that is, the main pseudowires established from the PE devices at both ends are symmetrical, so that when performing fault detection through BFD, a network fault cannot be detected, and thus the main pseudowire can be prevented from being idle.
The pseudowire establishing method provided by the embodiments of the present disclosure is described in detail below by specific embodiments.
As shown in fig. 2, a schematic flow diagram of a pseudowire establishing method provided in this disclosure is provided, where the method is applied to a first PE device of a first dual-homing unit in an EVPN networking, where the first PE device is a PE device that needs to establish a primary pseudowire with a second dual-homing unit in the EVPN networking, the second dual-homing unit includes a third PE device, and the third PE device is a PE device that needs to establish a primary pseudowire with the first dual-homing unit, and the method includes the following steps:
s201: and sending the address information of the first PE device to the second dual-homing unit, and indicating that the first PE device is a first main pseudo wire identifier of the PE device needing to establish the main pseudo wire, so that the third PE device establishes the main pseudo wire from the third PE device to the first PE device according to the address information of the first PE device and the first main pseudo wire identifier.
In the EVPN networking, the CE device may access the EVPN networking in a dual-homing manner, that is, for one CE device, the CE device and two PE devices connected thereto may form a dual-homing unit. In some scenarios, a pseudowire needs to be established between one PE device of one dual-homing unit and two PE devices of another dual-homing unit, where, for any one PE device in one dual-homing unit, pseudowires established between the PE device and two PE devices in the opposite-side dual-homing unit are a primary pseudowire and a backup pseudowire, respectively. For convenience of description, in the embodiments of the present disclosure, the two dual-homing units are referred to as a first dual-homing unit and a second dual-homing unit, respectively.
When the first PE device sends the address information of the first PE device and the first primary pseudowire identifier to the second dual homing unit, the address information of the first PE device and the first primary pseudowire identifier may be sent in the EVPN networking in a broadcast manner. Or, the pseudowire establishment request may be broadcast in the EVPN networking network, and after receiving the response information sent by the second dual-homing unit, the address information of the first PE device and the first primary pseudowire identifier may be directly sent to the second dual-homing unit, which is not limited specifically.
In this step, the address information of the first PE device may be an IP (Internet Protocol) address or a MAC (Media Access Control) address of the first PE device, and the like. The first primary pseudowire identifier indicating that the first PE device is a PE device that needs to establish a primary pseudowire may be a label or an information identifier that is sent to the second dual-homing unit simultaneously with the address information of the first PE device. The first PE device may directly send its address information and a label indicating that the first PE device is a PE device that needs to establish a primary pseudowire to the second dual homing unit, or may identify the address information of the first PE device as a peer (peer) address of the primary pseudowire, and send the peer address of the primary pseudowire and the information identification of the peer address of the primary pseudowire to the second dual homing unit.
In an implementation manner, before sending address information of a first PE device and a first primary pseudowire identifier indicating that the first PE device is a PE device that needs to establish a primary pseudowire to a second dual-homing unit, a routing message of a second PE device sent by the second PE device may be received first, where the second PE device refers to another PE device in the first dual-homing unit, and the routing message carries address information of the second PE device, such as an IP address or a MAC address of the second PE device, and so on.
When the address information of the second PE device and the address information of the first PE device satisfy the preset relationship, it may be determined that the first PE device is a PE device that needs to establish a primary pseudowire with the second dual homing unit, and in this case, the first PE device sends the address information of the first PE device to the second dual homing unit, and indicates that the first PE device is a first primary pseudowire identifier of a PE device that needs to establish a primary pseudowire.
For example, the address information of the first PE device and the second PE device may be IP addresses of the first PE device and the second PE device, respectively, so in an implementation manner, under the condition that the IP address of the first PE device is smaller than the IP address of the second PE device, it may be determined that the address information of the second PE device and the address information of the first PE device satisfy a preset relationship, and then the first PE device is determined as a PE device that needs to establish a primary pseudowire with the second dual homing unit.
Or, in another implementation, the routing message of the second PE device may further carry a Virtual Local Area Network Identifier (VLAN ID) of the second PE device, so that the serial numbers of the first PE device and the second PE device may be determined according to the IP addresses of the first PE device and the second PE device, then a remainder obtained by dividing the VLAN ID by the number of the PE devices in the first dual homing unit is calculated according to the VLAN ID, and when the remainder is equal to the serial number of the first PE device, it is determined that the address information of the second PE device and the address information of the first PE device satisfy a preset relationship, and the first PE device is determined as a PE device that needs to establish a main pseudowire with the second dual homing unit, which is not particularly limited.
The routing message may further carry an ESI (Ethernet Segment Identifier) value of the second PE device, where the ESI value is a unique Identifier defined by a connection between a certain PE device and a certain CE device, that is, two PE devices with the same ESI value are connected to the same CE device, and further, the first PE device may determine, after receiving the routing message sent by the certain PE device, whether the ESI value carried in the routing message is the same as the ESI value of the first PE device, and if so, determine the PE device as the second PE device.
In addition, the routing message may further include a VPLS (virtual private lan service) identifier of the PE device, where the VPLS identifier refers to an identifier of a VPLS accessed by the second PE device.
When the second PE device sends the routing message of the second PE device to the first PE device, the first PE device also sends the routing message carrying the address information of the first PE device to the second PE device, so that the second PE device can also determine the PE device which needs to establish the main pseudo wire with the second dual-homing unit from the first PE device and the second PE device based on the address information of the second PE device and the address information of the first PE device, if the address information of the second PE device and the address information of the first PE device do not meet the preset relationship, the second PE device is determined to be the PE device which needs to establish the main pseudo wire with the second dual-homing unit, and under the condition, the second PE device sends the address information of the second PE device to the second dual-homing unit and represents that the second PE device is the second main pseudo wire identifier of the PE device which needs to establish the main pseudo wire, and the third PE device establishes the main pseudo wire from the third PE device to the second PE device according to the address information of the second PE device and the second main pseudo wire identifier.
In this embodiment of the present disclosure, the third PE device is a PE device that needs to establish the primary pseudowire with the first dual-homing unit, and is determined from the two PE devices of the second dual-homing unit.
For example, similar to the way of determining, from the first PE device and the second PE device, a PE device that needs to establish a primary pseudowire with the second dual-homing unit, when determining, from two PE devices of the second dual-homing unit, a PE device that needs to establish a primary pseudowire with the first dual-homing unit, for any PE device in the second dual-homing unit, the PE device may receive a routing message that is sent by another PE device and carries address information of another PE device, and then determine, based on the address information of the two PE devices, the PE device that needs to establish a primary pseudowire with the first dual-homing unit.
For example, the address information of the PE device and the other PE device may be IP addresses of the PE device and the other PE device, respectively, and then in one implementation, in a case that the IP address of the PE device is smaller than the IP address of the other PE device, it may be determined that the address information of the PE device and the address information of the other PE device satisfy a preset relationship, and further determine the PE device as a PE device that needs to establish a main pseudowire with the first dual homing unit, that is, a third PE device, and conversely, if the IP address of the PE device is larger than the IP address of the other PE device, then determine the other PE device as a third PE device that needs to establish a main pseudowire with the first dual homing unit.
Or, in another implementation manner, the routing message of another PE device may further carry a VLAN ID of another PE device, then, according to the IP addresses of the PE device and the another PE device, the serial numbers of the PE device and the another PE device are determined, then, according to the VLAN ID, a remainder obtained by dividing the VLAN ID by the number of PE devices in the second dual homing unit is calculated, and when the remainder is equal to the serial number of the PE device, it is determined that the address information of the PE device and the address information of the another PE device satisfy a preset relationship, and then the PE device is determined as a PE device that needs to establish a main pseudowire with the first dual homing unit, that is, a third PE device, otherwise, if the remainder is equal to the serial number of the another PE device, then, the another PE device is determined as a third PE device that needs to establish a main pseudowire with the first dual homing unit, and is not particularly limited.
Thus, after the second dual-homing unit receives the address information of the first PE device and the first primary pseudowire identifier, a third PE device in the second dual-homing unit can be determined, and the third PE device can establish a primary pseudowire from the third PE device to the first PE device according to the address information of the first PE device and the first primary pseudowire identifier.
In this embodiment of the present disclosure, the process of determining the third PE device from the two PE devices in the second dual-homing unit may be performed simultaneously with the process of determining, from the first PE device and the second PE device, the PE device that needs to establish the primary pseudowire with the second dual-homing unit, or may be performed after the second dual-homing unit receives the address information and the first primary pseudowire identifier sent by the first PE device, which is not limited specifically.
S202: and receiving address information of the third PE device returned by the third PE device, and indicating that the third PE device is a third main pseudo wire identifier of the PE device needing to establish the main pseudo wire.
That is to say, after receiving the address information of the first PE device and the first primary pseudowire identifier, the third PE device in the second dual homing unit may return the address information of the third PE device and the third primary pseudowire identifier to the first PE device, where a manner in which the third PE device returns the address information of the third PE device may be that the address information of the third PE device and the third primary pseudowire identifier are broadcast in the EVPN networking; or, the message carrying the address information of the third PE device and the third main pseudo wire identifier may also be directly sent to the first PE device according to the received address information of the first PE device.
The address information of the third PE device may be an IP address or a MAC address of the third PE device, and so on. The third primary pseudowire identifier indicating that the third PE device is a PE device that needs to establish a primary pseudowire may be a label or an information identifier that is sent to the first dual homing unit simultaneously with the address information of the third PE device. The third PE device may directly send its address information and a label indicating that the third PE device is a PE device that needs to establish the main pseudowire to the first PE device, or may identify the address information of the third PE device as the peer address of the main pseudowire, and send the peer address of the main pseudowire and the information identification of the peer address of the main pseudowire to the first PE device.
S203: and establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier.
After receiving the address information of the third PE device and the third primary pseudowire identifier, the first PE device may establish a primary pseudowire from the first PE device to the third PE device according to the address information of the third PE device, that is, the primary pseudowire from the PE device of the first dual homing unit to the PE device of the second dual homing unit is from the first PE device to the third PE device, the primary pseudowire from the PE device of the second dual homing unit to the PE device of the first dual homing unit is from the third PE device to the first PE device, and the primary pseudowires in both directions are symmetric.
In this step, after the first PE device receives the address information of the third PE device and the third primary pseudowire identifier, it may be determined that the primary pseudowire established from the PE device of the second dual-homing unit to the PE device of the first dual-homing unit is from the third PE device to the first PE device, and based on this, it may be determined that the backup pseudowire is established from the first PE device to the fourth PE device.
That is to say, the first PE device may further receive address information of the fourth PE device, and indicate that the fourth PE device is a fourth spare pseudowire identifier of a PE device that needs to establish a spare pseudowire, and further, according to the address information of the fourth PE device and the fourth spare pseudowire identifier, a spare pseudowire from the first PE device to the fourth PE device may be established, so as to backup a main pseudowire from the first PE device to the third PE device, thereby reducing data transmission failure caused by a failure of the main pseudowire.
The fourth PE device may directly send a routing message carrying the address information and the fourth backup pseudowire identifier to the first PE device after receiving the address information of the first PE device and the first primary pseudowire identifier sent by the first PE device, or may forward a routing message carrying the address information and the fourth backup pseudowire identifier to the first PE device through the third PE device and a primary pseudowire from the third PE device to the first PE device, so that the first PE device establishes a backup pseudowire from the first PE device to the fourth PE device according to the routing message.
Or, the first PE device may broadcast a message that the establishment of the main pseudowire is successful after establishing the main pseudowire from the first PE device to the third PE device, and the fourth PE device sends address information and a fourth standby pseudowire identifier thereof to the first PE device after receiving the message that the establishment of the main pseudowire is successful, which is broadcast by the first PE device, so that the first PE device establishes the standby pseudowire from the first PE device to the fourth PE device according to the address information and the fourth standby pseudowire identifier of the fourth PE device.
In addition, the fourth PE device may also establish a backup pseudowire from the fourth PE device to the first PE device after receiving the address information of the first PE device and the first main pseudowire identifier sent by the first PE device, and then send the address information of the fourth PE device and the fourth backup pseudowire identifier to the first PE device through the backup pseudowire, so that the first PE device may establish a backup pseudowire from the first PE device to the fourth PE device according to the address information of the fourth PE device and the fourth backup pseudowire identifier sent by the fourth PE device through the backup pseudowire after receiving the address information of the fourth PE device and the fourth backup pseudowire identifier.
In addition, the first PE device may further send address information of the second PE device to the second dual-homing unit, and indicate that the second PE device is a second backup pseudowire identifier of a PE device that needs to establish a backup pseudowire, so that the third PE device may establish a backup pseudowire from the third PE device to the second PE device according to the address information of the second PE device and the second backup pseudowire identifier. In addition, the address information of the second PE device and the second backup pseudowire identifier may also be sent to the second dual homing unit by the second PE device.
The step of sending the address information of the second PE device and the second pseudo wire identifier to the second dual homing unit may be performed simultaneously with the step of sending the address information of the first PE device and the first primary pseudo wire identifier to the second dual homing unit by the first PE device, or may be performed after the first PE device establishes a primary pseudo wire from the first PE device to the third PE device, which is not limited specifically.
For example, as shown in fig. 3, a schematic diagram of a method for establishing a pseudowire in an EVPN networking network by applying the method provided by the embodiment of the present disclosure is shown in an implementation manner.
Firstly, the first PE device sends the address information of the first PE device and a first main pseudo wire identifier to a second dual homing unit, so that a third PE device in the second dual homing unit establishes a main pseudo wire from the third PE device to the first PE device according to the address information of the first PE device and the first main pseudo wire identifier, meanwhile, the first PE device can also send the address information of the second PE device and a second pseudo wire identifier to the second dual homing unit, so that the third PE device in the second dual homing unit establishes a standby pseudo wire from the third PE device to the second PE device according to the address information of the second PE device and the second pseudo wire identifier, then the first PE device receives the address information of the third PE device and the third main pseudo wire identifier returned by the third PE device, and establishes a main pseudo wire from the first PE device to the third PE device according to the address information of the third PE device and the third main pseudo wire identifier, meanwhile, the first PE device can also receive address information of the fourth PE device and a fourth spare pseudo wire identifier returned by the fourth PE device, and a spare pseudo wire from the first PE device to the fourth PE device is established according to the address information of the fourth PE device and the fourth spare pseudo wire identifier.
Therefore, when fault detection is carried out through BFD, a BFD session between the first PE device and the third PE device is established, BFD detection messages are sent according to preset intervals, the BFD detection messages sent by the first PE device reach the third PE device through the main pseudo wire, response messages replied by the third PE device reach the first PE device through the main pseudo wire, the receiving time cannot be overtime, the detection result is normal, and the main pseudo wire can be normally used. Further, data can be transmitted through the active and standby pseudo wires according to a data transmission protocol, for example, normal data forwarding can be through the primary pseudo wires, and when a primary pseudo wire link fails, data is transmitted through the standby pseudo wires.
As can be seen from the above, the pseudowire establishing method provided in the embodiment of the present disclosure can ensure that, for a first PE device, when a main pseudowire is established from a third PE device to the first PE device, the main pseudowire is also established from the first PE device to the third PE device, that is, the main pseudowires established from the PE devices at both ends are symmetrical, so that when performing fault detection through BFD, a network fault cannot be detected, and thus the main pseudowire can be prevented from being idle.
As shown in fig. 4, an embodiment of the present disclosure further provides a pseudowire establishing apparatus, which is applied to a first PE device of a first dual-homing unit in an EVPN networking, where the first PE device is a PE device that needs to establish a primary pseudowire with a second dual-homing unit in the EVPN networking, the second dual-homing unit includes a third PE device, and the third PE device is a PE device that needs to establish a primary pseudowire with the first dual-homing unit, and the apparatus includes:
a sending module 401, configured to send address information of a first PE device to a second dual-homing unit, and a first primary pseudowire identifier indicating that the first PE device is a PE device that needs to establish a primary pseudowire, so that a third PE device establishes a primary pseudowire from the third PE device to the first PE device according to the address information of the first PE device and the first primary pseudowire identifier;
a receiving module 402, configured to receive address information of a third PE device returned by the third PE device, and indicate that the third PE device is a third primary pseudowire identifier of a PE device that needs to establish a primary pseudowire;
an establishing module 403, configured to establish a primary pseudowire from the first PE device to the third PE device according to the address information of the third PE device and the third primary pseudowire identifier.
Optionally, the first dual-homing unit further includes a second PE device;
the sending module 401 is further configured to send address information of the second PE device to the second dual-homing unit, and indicate that the second PE device is a second spare pseudowire identifier of a PE device that needs to establish a spare pseudowire, so that the third PE device establishes the spare pseudowire from the third PE device to the second PE device according to the address information of the second PE device and the second spare pseudowire identifier.
Optionally, the second dual-homing unit further includes a fourth PE device;
the receiving module 402 is further configured to receive address information of the fourth PE device returned by the fourth PE device, and a fourth spare pseudo wire identifier indicating that the fourth PE device is a PE device that needs to establish a spare pseudo wire;
the establishing module 403 is further configured to establish a backup pseudowire from the first PE device to the fourth PE device according to the address information of the fourth PE device and the fourth backup pseudowire identifier.
Optionally, the first dual-homing unit further includes a second PE device; the device still includes: a determination module;
the receiving module 402 is further configured to receive a routing message of the second PE device sent by the second PE device, where the routing message carries address information of the second PE device;
the determining module 404 is further configured to determine that the first PE device is a PE device that needs to establish a primary pseudowire with the second dual-homing unit when the address information of the second PE device and the address information of the first PE device satisfy a preset relationship.
Optionally, the sending module 401 is further configured to:
and sending the address information of the first PE equipment in the EVPN networking by adopting a broadcasting mode, and showing that the first PE equipment is a first primary pseudo wire identifier of the PE equipment needing to establish the primary pseudo wire.
As can be seen from the above, the pseudo wire establishing apparatus provided in the embodiment of the present disclosure, for a first PE device, can ensure that, under the condition that a main pseudo wire is established from a third PE device to the first PE device, the main pseudo wire is also established from the first PE device to the third PE device, that is, the main pseudo wires established from the PE devices at both ends are symmetrical, so that when performing fault detection through BFD, a network fault cannot be detected, and thus the main pseudo wire can be prevented from being idle.
The disclosed embodiment also provides an electronic device, as shown in fig. 5, including a processor 501, a communication interface 502, a memory 503 and a communication bus 504, where the processor 501, the communication interface 502, and the memory 503 complete mutual communication through the communication bus 504,
a memory 503 for storing a computer program;
the processor 501, when executing the program stored in the memory 503, implements the following steps:
sending the address information of the first PE equipment to the second dual-homing unit, and indicating that the first PE equipment is a first main pseudo wire identifier of the PE equipment needing to establish the main pseudo wire, so that the third PE equipment establishes the main pseudo wire from the third PE equipment to the first PE equipment according to the address information of the first PE equipment and the first main pseudo wire identifier;
receiving address information of the third PE device returned by the third PE device, and indicating that the third PE device is a third main pseudo wire identifier of the PE device needing to establish the main pseudo wire;
and establishing the main pseudo wire from the first PE equipment to the third PE equipment according to the address information of the third PE equipment and the third main pseudo wire identifier.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
As can be seen from the above, the pseudowire establishing method provided in the embodiment of the present disclosure can ensure that, for a first PE device, when a main pseudowire is established from a third PE device to the first PE device, the main pseudowire is also established from the first PE device to the third PE device, that is, the main pseudowires established from the PE devices at both ends are symmetrical, so that when performing fault detection through BFD, a network fault cannot be detected, and thus the main pseudowire can be prevented from being idle.
In yet another embodiment provided by the present disclosure, there is also provided a computer-readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the pseudowire establishment method of any of the above embodiments.
In yet another embodiment provided by the present disclosure, there is also provided a computer program product containing instructions that, when run on a computer, cause the computer to perform the pseudowire establishment method of any of the above embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, apparatus embodiments, electronic device embodiments, storage medium embodiments, and computer program product embodiments are described in greater detail with reference to the method embodiments, where relevant, in the description of the method embodiments.
The above are merely preferred embodiments of the present disclosure, and are not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure are included in the scope of protection of the present disclosure.
Claims (12)
1. A pseudo wire establishing method is characterized in that the method is applied to a first service provider network edge PE device of a first dual-homing unit in an Ethernet virtual private network EVPN (Ethernet virtual private network) networking, the dual-homing unit consists of a user network edge CE device accessing the Ethernet virtual private network EVPN networking and two service provider network edge PE devices connected with the user network edge CE device, the first service provider network edge PE device is a service provider network edge PE device needing to establish a primary pseudo wire with a second dual-homing unit in the Ethernet virtual private network EVPN networking, the second dual-homing unit comprises a third service provider network edge PE device, the third service provider network edge PE device is a service provider network edge PE device needing to establish the primary pseudo wire with the first dual-homing unit, the method comprises the following steps:
sending address information of the first service provider network edge PE device and a first primary pseudowire identifier indicating that the first service provider network edge PE device is a service provider network edge PE device needing to establish a primary pseudowire to the second dual-homing unit, so that the third service provider network edge PE device establishes the primary pseudowire from the third service provider network edge PE device to the first service provider network edge PE device according to the address information of the first service provider network edge PE device and the first primary pseudowire identifier;
receiving address information of the third service provider network edge PE device returned by the third service provider network edge PE device, and indicating a third main pseudo wire identifier of the third service provider network edge PE device as a service provider network edge PE device needing to establish a main pseudo wire;
and establishing a main pseudo wire from the first service provider network edge PE device to the third service provider network edge PE device according to the address information of the third service provider network edge PE device and the third main pseudo wire identifier.
2. The method of claim 1, wherein the first dual-homing unit further comprises a second service provider network edge (PE) device;
the method further comprises the following steps:
and sending the address information of the second service provider network edge PE device to the second dual-homing unit, and indicating that the second service provider network edge PE device is a second spare pseudo wire identifier of the service provider network edge PE device needing to establish a spare pseudo wire, so that the third service provider network edge PE device establishes the spare pseudo wire from the third service provider network edge PE device to the second service provider network edge PE device according to the address information of the second service provider network edge PE device and the second spare pseudo wire identifier.
3. The method of claim 1, wherein the second dual-homing unit further comprises a fourth service provider network edge (PE) device;
after the sending address information of the first service provider network edge PE device to the second dual-homing unit, further comprising:
receiving address information of the fourth service provider network edge PE device returned by the fourth service provider network edge PE device, and a fourth spare pseudo wire identifier indicating that the fourth service provider network edge PE device is a service provider network edge PE device needing to establish a spare pseudo wire;
and establishing a spare pseudo wire from the first service provider network edge PE device to the fourth service provider network edge PE device according to the address information of the fourth service provider network edge PE device and the fourth spare pseudo wire identifier.
4. The method of claim 1, wherein the first dual-homing element further comprises a second service provider network edge (PE) device, and wherein the first service provider network edge (PE) device is determined to be a service provider network edge (PE) device that requires a primary pseudowire to be established with the second dual-homing element by:
receiving a routing message of the second service provider network edge PE device, which is sent by the second service provider network edge PE device, wherein the routing message carries address information of the second service provider network edge PE device;
when the address information of the second service provider network edge PE device and the address information of the first service provider network edge PE device satisfy a preset relationship, determining that the first service provider network edge PE device is a service provider network edge PE device which needs to establish a primary pseudo wire with the second dual-homing unit.
5. The method of claim 1, wherein the sending address information of the first service provider network edge (PE) device and a first primary pseudowire identification indicating that the first PE device is a service provider network edge (PE) device requiring establishment of a primary pseudowire to the second dual-homing unit comprises:
and sending the address information of the first service provider network edge PE equipment in the Ethernet virtual private network EVPN networking by adopting a broadcasting mode, and showing that the first service provider network edge PE equipment is a first main pseudo wire identifier of the service provider network edge PE equipment needing to establish a main pseudo wire.
6. A pseudo wire establishing device is characterized in that the device is applied to a first service provider network edge PE device of a first dual-homing unit in an Ethernet virtual private network EVPN (Ethernet virtual private network) networking, the dual-homing unit consists of a user network edge CE device accessed into the Ethernet virtual private network EVPN networking and two service provider network edge PE devices connected with the user network edge CE device, the first service provider network edge PE device is a service provider network edge PE device needing to establish a primary pseudo wire with a second dual-homing unit in the Ethernet virtual private network EVPN networking, the second dual-homing unit comprises a third service provider network edge PE device, the third service provider network edge PE device is a service provider network edge PE device needing to establish the primary pseudo wire with the first dual-homing unit, the device comprises:
a sending module, configured to send address information of the first service provider network edge PE device to the second dual-homing unit, and indicate that the first service provider network edge PE device is a first primary pseudowire identifier of a service provider network edge PE device that needs to establish a primary pseudowire, so that the third service provider network edge PE device establishes a primary pseudowire from the third service provider network edge PE device to the first service provider network edge PE device according to the address information of the first service provider network edge PE device and the first primary pseudowire identifier;
a receiving module, configured to receive address information of the third service provider network edge PE device returned by the third service provider network edge PE device, and indicate that the third service provider network edge PE device is a third primary pseudowire identifier of a service provider network edge PE device that needs to establish a primary pseudowire;
and the establishing module is used for establishing the main pseudo wire from the first service provider network edge PE equipment to the third service provider network edge PE equipment according to the address information of the third service provider network edge PE equipment and the third main pseudo wire identifier.
7. The apparatus of claim 6, wherein the first dual-homing unit further comprises a second service provider network edge (PE) device;
the sending module is further configured to send address information of the second service provider network edge PE device to the second dual-homing unit, and indicate that the second service provider network edge PE device is a second backup pseudowire identifier of a service provider network edge PE device that needs to establish a backup pseudowire, so that the third service provider network edge PE device establishes the backup pseudowire from the third service provider network edge PE device to the second service provider network edge PE device according to the address information of the second service provider network edge PE device and the second backup pseudowire identifier.
8. The apparatus of claim 6, wherein the second dual-homing unit further comprises a fourth service provider network edge (PE) device;
the receiving module is further configured to receive address information of the fourth service provider network edge PE device returned by the fourth service provider network edge PE device, and a fourth spare pseudo wire identifier indicating that the fourth service provider network edge PE device is a service provider network edge PE device that needs to establish a spare pseudo wire;
the establishing module is further configured to establish a backup pseudowire from the first service provider network edge PE device to the fourth service provider network edge PE device according to the address information of the fourth service provider network edge PE device and the fourth backup pseudowire identifier.
9. The apparatus of claim 6, wherein the first dual-homing unit further comprises a second service provider network edge (PE) device; the device further comprises: a determination module;
the receiving module is further configured to receive a routing message of the second service provider network edge PE device, where the routing message carries address information of the second service provider network edge PE device, where the routing message is sent by the second service provider network edge PE device;
the determining module is further configured to determine that the first service provider network edge PE device is a service provider network edge PE device that needs to establish a primary pseudowire with the second dual-homing unit when the address information of the second service provider network edge PE device and the address information of the first service provider network edge PE device satisfy a preset relationship.
10. The apparatus of claim 6, wherein the sending module is further configured to:
and sending the address information of the first service provider network edge PE equipment in the Ethernet virtual private network EVPN networking by adopting a broadcasting mode, and showing that the first service provider network edge PE equipment is a first main pseudo wire identifier of the service provider network edge PE equipment needing to establish a main pseudo wire.
11. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any one of claims 1 to 5 when executing a program stored in the memory.
12. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of the claims 1-5.
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