CN115333991A - Cross-device link aggregation method, device, system and computer-readable storage medium - Google Patents
Cross-device link aggregation method, device, system and computer-readable storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a cross-device link aggregation method, a device, a system and a computer storage medium, belonging to the technical field of communication, wherein the method is applied to link aggregation uplink equipment which is connected with an aggregation group consisting of a plurality of downlink network devices through an aggregation link consisting of a plurality of member links, and the method comprises the following steps: when the message type of the message to be processed is determined to be a protocol message, the message to be processed is copied for each member link, and the message to be processed is sent to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and data synchronization can be realized without running protocols among all downlink network equipment in an aggregation group, so that normal realization of subsequent link transmission is ensured, the compatibility of cross-equipment link aggregation is improved, and the realization cost of cross-equipment link aggregation is reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a system, and a computer-readable storage medium for cross-device link aggregation.
Background
Stacking and cross-device Link Aggregation Group (M-LAG) are two widely used horizontal virtualization technologies, and logically implement virtualization of multiple communication devices as one device. The stacking technology refers to that a plurality of devices supporting stacking are combined together and logically combined into a whole device. The user can view the multiple devices as a single device for management and use. Therefore, the number of ports and the switching capacity can be expanded by increasing the devices, and the reliability of the devices is enhanced by mutual backup among a plurality of devices. The M-LAG technique performs link aggregation negotiation with the accessed device in the same state through two access switches, and looks like the accessed device that a link aggregation relationship is established with one device. Reliability can be improved from the single board level to the device level by link aggregation across devices.
In practical networking applications, the two horizontal virtualization technologies respectively have the following disadvantages:
the stacking technology is high in implementation cost, a plurality of stacking cables need to be configured, the expansion capability is poor, the failure of the main equipment can affect the member equipment, the capability of the control plane is limited to the capability of the main equipment, and the original network architecture or the restarting equipment needs to be changed when more than three pieces of equipment are expanded, so that the existing service is affected;
protocol message interaction is required for a peer-link line between M-LAG devices, and data traffic interaction is required at the same time, so that configuration complexity is high, and abnormal traffic forwarding caused by asynchronous table entries is easily generated.
Based on the above, the existing lateral virtualization technology needs to be improved.
Disclosure of Invention
In view of this, an object of the present invention is to provide a method, an apparatus, a system, and a computer-readable storage medium for performing cross-device link aggregation, in which devices performing cross-device link aggregation do not need to have the same model and function, and all network devices in an aggregation group can implement data synchronization, so as to ensure that subsequent link transmission of cross-device link aggregation is normally implemented to a certain extent, improve compatibility of cross-device link aggregation, and reduce implementation cost of cross-device link aggregation.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions.
In a first aspect, an embodiment of the present invention provides a cross-device link aggregation method, which is applied to a link aggregation uplink device, where the link aggregation uplink device is connected to an aggregation group formed by multiple downlink network devices through an aggregation link formed by multiple member links, and the method includes:
determining the message type of the message to be processed;
when the message type is a protocol message, copying the message to be processed aiming at each member link;
and respectively sending the message to be processed to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and the link information among the downlink network equipment is consistent.
Further, the link aggregation uplink device is a single communication device or a virtualization device formed by at least two communication devices through link aggregation; each communication device comprises a plurality of downlink member interfaces, each downlink network device comprises at least one aggregation member interface, and each member link is formed by connecting one downlink member interface with one aggregation member interface;
when the message to be processed is an ARP request message, the step of sending the message to be processed to the downlink network device corresponding to the member link through each member link, so that each downlink network device obtains link synchronization information through the message to be processed includes:
respectively configuring the copied ARP request message to each downlink member interface of the link aggregation uplink equipment, and transmitting the ARP request message to downlink network equipment corresponding to the member link through the member link corresponding to each downlink member interface so as to enable each downlink network equipment to generate an ARP table entry according to member interface information and logic interface information of the aggregation member interface of the downlink network equipment;
and receiving and processing an ARP response message returned by each piece of the downstream network equipment aiming at the ARP request message, and learning the ARP table entry in the ARP response message.
Further, when the packet to be processed is an OSPF packet, the step of sending the packet to be processed to the downlink network device corresponding to the member link through each member link, so that each downlink network device obtains link synchronization information through the packet to be processed includes:
and respectively configuring the copied OSPF messages to each member link, and transmitting the messages to be processed to the downlink network equipment corresponding to the member links so as to promote each downlink network equipment and the link aggregation uplink equipment to establish OSPF neighbors.
Further, the method further comprises:
when the message type of the message to be processed is a non-protocol message, determining a target member interface from all the downlink member interfaces based on the downlink member interface appointed by the adjacency list of the message to be processed;
and sending the message to be processed to the aggregation group through a member link corresponding to the target member interface.
Further, the step of determining a target member interface from all the downline member interfaces based on the downline member interface specified by the adjacency list of the to-be-processed packet includes:
if the message to be processed is a locally generated message, inquiring whether an interface field for specifying a downlink member interface exists in the adjacency list, if so, taking the downlink member interface specified by the interface field in the adjacency list as a target member interface, and if not, taking a root port of the link aggregation uplink equipment as the target member interface;
and if the message to be processed is a forwarding message, inquiring whether an adjacent table has an interface field for specifying a downlink member interface, if so, taking the downlink member interface specified by the interface field in the adjacent table as a target member interface, and if not, determining the target member interface from all the downlink member interfaces without faults by utilizing a Hash algorithm.
Further, the method further comprises:
when the message type is a non-protocol message, inquiring a next hop address and a destination address from an adjacency list of the message to be processed, and judging whether the next hop address is consistent with the destination address;
if yes, a downstream member interface appointed by an interface field in the adjacency list is used as a target member interface;
if not, when the message to be processed is a locally generated message, the root port of the link aggregation uplink device is used as a target member interface, and when the message to be processed is a forwarding message, the target member interface is determined from all the faultless downlink member interfaces by using a Hash algorithm.
Further, the method further comprises:
establishing a session between a downstream member interface and an aggregation member interface of each member link;
monitoring all the sessions in real time, and judging whether each member link is communicated or not according to the response condition of the sessions;
and if the member link cannot be communicated, setting the state identifier of the downlink member interface of the member link as invalid, and updating the ARP table entry on the link aggregation uplink equipment.
In a second aspect, an embodiment of the present invention provides a cross-device link aggregation system, including a link aggregation uplink device, and an aggregation group formed by multiple downlink network devices connected to multiple member links of the link aggregation uplink device;
the link aggregation uplink device is configured to implement the cross-device link aggregation method according to the first aspect;
and the aggregation group is used for receiving and processing the message to be processed sent by the link aggregation uplink equipment.
In a third aspect, an embodiment of the present invention provides an apparatus for configuring a backup link aggregation, where the apparatus is applied to a link aggregation uplink device, the link aggregation uplink device is connected to an aggregation group formed by multiple downlink network devices through an aggregation link formed by multiple member links, and the apparatus for cross-device link aggregation includes a processing module and a transmission module:
the processing module is used for determining the message type of the message to be processed, and when the message type is a protocol message, copying the message to be processed aiming at each member link;
the transmission module is configured to send the to-be-processed packet to the downlink network device corresponding to the member link through each member link, so that each downlink network device obtains link synchronization information through the to-be-processed packet, and thus link information between the downlink network devices is consistent.
In a fourth aspect, an embodiment of the present invention provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the cross-device link aggregation method according to the first aspect.
According to the cross-device link aggregation method, device, system and storage medium provided by the embodiment of the invention, when the message type of the message to be processed is determined to be a protocol message, the link aggregation uplink device copies the number of the messages to be processed, which is matched with the number of the member links, so that the messages to be processed are transmitted to the downlink network devices corresponding to the member links through each member link, each downlink network device of the aggregation group can obtain link synchronization information through the message to be processed, all network devices performing cross-device link aggregation can realize data synchronization without the need of having the same model and function, and the normal realization of the subsequent link transmission of the cross-device link aggregation is ensured, so that the compatibility of the cross-device link aggregation is improved, and the configuration complexity and the realization cost of the cross-device link aggregation are reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 shows a block schematic diagram of a cross-device link aggregation system according to an embodiment of the present invention.
Fig. 2 shows one of the structural diagrams of the cross-device link aggregation system provided by the embodiment of the present invention.
Fig. 3 shows one of the flow diagrams of the cross-device link aggregation method provided in the embodiment of the present invention.
Fig. 4 shows a schematic flow diagram of part of the sub-steps of step S105 in fig. 3.
Fig. 5 illustrates a second schematic structural diagram of a cross-device link aggregation system according to an embodiment of the present invention.
Fig. 6 illustrates a second flowchart of the cross-device link aggregation method according to an embodiment of the present invention.
Fig. 7 is a third flowchart illustrating a cross-device link aggregation method according to an embodiment of the present invention.
Fig. 8 shows a block schematic diagram of a cross-device link aggregation apparatus according to an embodiment of the present invention.
Fig. 9 is a block diagram of an electronic device according to an embodiment of the present invention.
Reference numerals: 100-cross device link aggregation system; 110-link aggregation uplink devices; 120-polymeric group; 121-a downstream network device; 130-cross device link aggregation means; 140-a processing module; 150-a transmission module; 160-a detection module; 170-electronic device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that 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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the prior art, devices belonging to the cross-device link aggregation group are required to have the same model and function, so that the consistency of information among the devices is ensured by configuring a relevant protocol, the compatibility of the whole cross-device link aggregation group is greatly reduced, and the implementation cost is improved. In addition, if data traffic needs to run between devices in the cross-device link aggregation group, the configuration complexity is greatly increased if a protocol needs to run between devices.
Based on the above considerations, embodiments of the present invention provide a cross-device link aggregation scheme, where devices performing cross-device link aggregation do not need to have the same model and function, and data of all devices in an aggregation group may be synchronized, so as to ensure that subsequent link transmission of the cross-device link aggregation is normally implemented to a certain extent, improve compatibility of performing the cross-device link aggregation, and reduce implementation cost of the cross-device link aggregation. Meanwhile, the configuration complexity of cross-device link aggregation can be reduced. The following description is made in detail.
In one embodiment, referring to fig. 1, a cross-device link aggregation system 100 is provided that includes a link aggregation upstream device 110, and an aggregation group 120 of multiple downstream network devices 121 connected to multiple member links of the link aggregation upstream device 110. A plurality of member links form an aggregation link, and one member link connects one downstream network device 121. The number of the downstream network devices 121 is at least two, and the downstream network devices 121 have a cross-device link aggregation relationship.
The member link is a logical link formed by binding a plurality of member links between the downstream network device 121 and the link aggregation upstream device 110 in the aggregation group 120, that is, an ethernet aggregation link includes a plurality of member links.
When the aggregation group 120 includes two downlink network devices 121, in the cross-device link aggregation system 100, two member links respectively connected to the two downlink network devices 121 may be bundled into one aggregation link. When the aggregation group 120 includes three downlink network devices 121, three member links respectively connected to the three downlink network devices 121 may be bundled into one aggregation link in the cross-device link aggregation system 100.
The link aggregation uplink device 110 may be a single communication device, or a virtualized device obtained by virtualizing at least two communication devices by using a stacking technique, or a virtualized device formed by aggregating at least two communication devices through links, or a device obtained by using another virtualization technique. In the present embodiment, it is not particularly limited.
The link aggregation uplink device 110 is configured to determine a message type of a message to be processed, when the message type is a protocol message, copy the message to be processed for each member link, and send the message to be processed to the downlink network device 121 corresponding to the member link through each member link, so that each downlink network device 121 obtains link synchronization information through the message to be processed.
After receiving the message to be processed, the downlink network device 121 processes and responds to the message to be processed, so that not only can a response message be returned, but also the configuration required by the message to be processed can be performed, the message can be continuously forwarded to the downlink device, and meanwhile, the protocol information in the message to be processed can also be learned. Therefore, the link information synchronization between the downlink network devices 121 in the aggregation group 120 can be realized, so that the link information of the downlink network devices 121 is consistent.
The message to be processed may be a message sent by the uplink device of the link aggregation uplink device 110, or may be a message locally generated by the link aggregation uplink device 110. The link synchronization information is used to make the link information consistent between the downstream network devices 121 in the aggregation group 120. In particular, in one embodiment, the link synchronization information is used to ensure the protocol packet information synchronization between the downstream network devices 121 in the aggregation group 120.
In the above cross-device link aggregation system 100, through interaction between the link aggregation uplink device and the aggregation group, each downlink network device of the aggregation group can obtain link synchronization information through a to-be-processed message, and all devices performing cross-device link aggregation do not need to have the same model and function, so that data synchronization of all devices in the aggregation group can be achieved, and normal implementation of subsequent link transmission of cross-device link aggregation can be ensured to a certain extent, thereby improving compatibility of cross-device link aggregation. Meanwhile, the configuration complexity of cross-device link aggregation can be reduced, and the implementation cost of cross-device link aggregation can be reduced.
The link aggregation control protocol (LACP protocol) is a control protocol for cross-device link aggregation, and is used for exchanging information with a peer. After the port of the device activates the LACP protocol, the port will notify the opposite end of its system priority, system MAC address, port priority, port number and operation key by sending link convergence control protocol data unit (lacpdu). After receiving the information, the opposite terminal compares the information with the information of other ports to select the port capable of converging, so that the two terminals can reach the agreement of adding or quitting a certain dynamic convergence group to the port.
Since cross-device link aggregation runs on the network device 121 in the aggregation group 120, in order to ensure that the link aggregation control protocol can be negotiated normally, the configuration is performed between the link aggregation uplink device 110 in the cross-device link aggregation system 100 and the network device 121 in the aggregation group 120 shown in fig. 1.
The configuration content comprises the following steps: the system-ID (system-ID) of the LACP of all the downstream network devices 121 in the aggregation group are configured to the same value; the aggregation member interfaces of all the downstream network devices 121 in the aggregation group are configured with the same MAC address; the LACP priority configured on the link aggregation uplink device 110 is higher than the LACP priorities configured on all the downlink network devices 121 in the aggregation group, so that the link aggregation uplink device 110 always serves as a root port decision maker.
The root port refers to a port selected when the link aggregation uplink device 110 sends a protocol packet to the aggregation group. In the prior art, a link aggregation uplink device generally sends a protocol packet to an aggregation group through a root port.
Through the configuration, the link aggregation uplink device can determine the root port from the own downlink member interface in real time according to the system priority, the system MAC address, the port priority, the port number and the operation key of the downlink network device in the aggregation group. In this embodiment, the lower contact member interface refers to an interface used by the link aggregation upper contact device to connect to the aggregation group.
Specifically, as shown in fig. 2, if the port priority of the aggregation member interface gi0 on the downlink network device a is higher than the port priorities of the other aggregation member interfaces, the link aggregation uplink device 110 uses the downlink member interface 1 connected to the aggregation member interface gi0 as the root port.
Based on the same principle, when the cross-device link aggregation is configured to be an LACP dynamic mode, the Peer-link interfaces of two downlink network devices in the aggregation group can also carry out LACP protocol interaction, and the Peer-link interface fault detection can be realized through the keep-alive of the LACP protocol. When the cross-device link aggregation is configured in the LACP static mode, no LACP protocol interaction is performed, and at this time, only MAC addresses of aggregation member interfaces of all downlink network devices in the aggregation group are the same.
It should be understood that the cross-device link aggregation system 100 described above may be part of a large communication system. For example, the cross-device link aggregation system 100 may be a part of a courier network, in detail, the aggregation group 120 may be a mesh point device in the courier network, and the link aggregation uplink device 110 may be a sorting and transferring device of a sorting and transferring center in the city of the courier network.
In an embodiment, referring to fig. 3, a cross-device link aggregation method is provided, where the cross-device link aggregation method includes the following steps, and this embodiment is exemplified by applying the cross-device link aggregation method to the link aggregation uplink device 110 in the cross-device link aggregation system 100.
S101, determining the message type of the message to be processed.
The message to be processed may be a protocol message or a non-protocol message locally generated by the link aggregation uplink device 110, or may be a protocol message or a non-protocol message sent by the uplink device of the link aggregation uplink device 110. Whether the message is a protocol message can be determined according to message header information and the like of the message.
S103, when the message type is a protocol message, copying the message to be processed aiming at each member link.
The number of member links of the downlink member interfaces used for connecting with the aggregation group 120 of the link aggregation uplink device 110 is the same as the number of the member links, that is, each member link is configured with one message to be processed.
And S105, respectively sending the message to be processed to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and thus the link information among the downlink network equipment is consistent.
Through the steps S101 to S105, data synchronization can be achieved for all downlink network devices in the aggregation group without requiring that all devices in the cross-device link aggregation have the same model and function, and it is ensured that subsequent link transmission of the cross-device link aggregation is normally achieved, thereby improving compatibility of the cross-device link aggregation. Meanwhile, the configuration complexity of cross-device link aggregation can be reduced, and the implementation cost of cross-device link aggregation can be reduced.
As known from the above description of the cross-device link aggregation system 100, the link aggregation uplink device may be a single communication device, or may be a virtualization device formed by at least two communication devices through link aggregation, each communication device may include a plurality of downlink member interfaces, each downlink network device in the aggregation group includes at least one aggregation member interface, and each member link is formed by connecting one downlink member interface to one aggregation member interface.
Protocol messages include, but are not limited to: ARP request message, OSPF message and other protocol messages.
In the prior art, a protocol packet is generally sent from a root port of a link aggregation uplink device to an aggregation group, so that the protocol packet can be finally sent only to one downlink network device in the aggregation group. When the protocol message is an OSPF message and no protocol is configured between the downstream network devices in the aggregation group, only one downstream network device in the aggregation group can respond to the OSPF message and link aggregation upstream device to establish an OSPF neighbor, which affects the transmission of subsequent protocol messages.
To overcome the above problem, the link aggregation uplink device and all downlink network devices in the aggregation group establish an OSPF neighbor. When the message to be processed is an OSPF message, the step S105 may be implemented by the following steps: and respectively configuring the copied OSPF messages to each member link, and transmitting the messages to be processed to the downlink network equipment corresponding to the member links so as to promote each downlink network equipment and the link aggregation uplink equipment to establish OSPF neighbors. I.e. the above step is a sub-step of step S105.
After receiving the OSPF message from the aggregation member interface, the downstream network device 121 generates an OSPF response message, and returns the response message from the aggregation member interface to the link aggregation upstream device 110, so as to complete establishment of the OSPF neighbor.
Similarly, in the prior art, due to the limitation of the message sending mechanism, the link aggregation uplink device cannot learn the information of all downlink network devices in the aggregation group. When the protocol message is an ARP request message and no protocol is configured between the network devices connected to the lower link in the aggregation group, the link aggregation network device connected to the link aggregation device can only learn the mapping relationship between the aggregation member interface of one network device connected to the lower link in the aggregation group and the address of the aggregation group, which will affect the subsequent transmission of the protocol message.
In order to solve the problem that the link aggregation uplink device cannot learn the relationship information between the aggregation member interfaces of all the downlink network devices in the aggregation group and the addresses of the aggregation group, referring to fig. 4, the step S105 may be implemented by the following steps when the message to be processed is an ARP message.
S1051, respectively configuring the duplicated ARP request message to each downlink member interface of the link aggregation uplink device, and transmitting the ARP request message to the downlink network device corresponding to the member link through the member link corresponding to each downlink member interface, so as to enable each downlink network device to generate an ARP table entry according to the member interface information and the logic interface information of the aggregation member interface of the downlink network device.
S1052, receiving and processing the ARP response message returned by each network device connected downstream to the ARP request message, and learning the ARP table entry in the ARP response message.
The member interface information comprises the number information of the aggregation member interface and the aggregation link information, and the logic interface information comprises the IP address and the MAC address of the aggregation group.
When the aggregation member interface of the downstream network equipment in the aggregation group receives the ARP request message, the downstream network equipment takes the member interface information and the logic interface information of the aggregation member interface as an ARP table item in a mapping relation, and after the ARP table item is loaded into a message descriptor of an ARP response message, the member link corresponding to the aggregation member interface is returned to the link aggregation uplink equipment, so that the link aggregation uplink equipment obtains the ARP table item of the aggregation member interface. It should be appreciated that the ARP entry is an interface index for the aggregation member interface.
After the link aggregation uplink device receives the ARP response message, an ARP (address resolution protocol) module of the link aggregation uplink device learns ARP table entries in the message descriptor and stores the ARP table entries in an adjacency management table (an adjacency table for short). Because the adjacent management table and the ARP module in the prior art do not store the logic interface information of the aggregation member interface, compared with the prior art, the invention expands the data structure of the ARP module to store the member interface information of the aggregation member port, similarly, the adjacent management table expands the data structure to store the member interface information of the aggregation member port, and the improved ARP module and the improved adjacent management table are used for guiding the link aggregation to forward the message.
The ARP module and the adjacency management table can aggregate member interface information of the member interfaces into member interface information.
When the downstream network equipment receives the ARP request message, the ARP table entries contained in the ARP request message are learned by the downstream network equipment. In addition, if the aggregation group has an off-hook device, the ARP request message is continuously sent to the off-hook device to obtain the address information of the off-hook device.
Through the above steps S1051-S1052, the ARP module complements the member interface field to record the member interface information of all aggregation member interfaces in the aggregation group, i.e. the ARP entry changes. With the change of the ARP table entry, the embodiment of the invention also improves the sending flow of the non-protocol message in the cross-device link aggregation system, so that the non-protocol message can be accurately sent to the destination.
In the prior art, the sending method of the non-protocol message is as follows: and selecting a member interface from the downlink member interfaces of the link aggregation uplink equipment by adopting a Hash algorithm, and sending the member interface to the aggregation group through a link member interface corresponding to the selected member interface, which causes packet loss of part of messages or failure of requests.
In detail, in the prior art, when a non-protocol packet is sent, for the forwarded non-protocol packet, a HASH (HASH) algorithm in a load balancing algorithm is used to select one interface from the downstream member interfaces of the link aggregation uplink device to send, and for the ping request packet of the local device, the ping request packet is generally sent from the root port. However, in a networking environment where cross-device link aggregation is performed, if the message is still sent in the above manner, a problem of packet loss or failure of ping request may be caused.
As shown in fig. 5, the network device B is connected to 100.1.1.0/24 network, the network device C is connected to 100.2.1.0/24 network, and when the link aggregation uplink device a receives the message addressed to the 100.1.1.0/24 network, it can only forward the message from the downlink member interface 1, and can ensure that the message can be normally addressed to the destination. Similarly, a message arriving at the 100.2.1.0/24 network can only be forwarded from the downlink member interface 1 to ensure that the message is normally forwarded to a destination.
In order to solve the problem of packet loss or ping request failure caused by the original message sending method in the networking environment where the cross-device link aggregation is performed, referring to fig. 6, the cross-device link aggregation method provided in the embodiment of the present invention further includes the following steps.
S102, when the message type of the message to be processed is a non-protocol message, determining a target member interface from all the downlink member interfaces based on the downlink member interface appointed by the adjacency list of the message to be processed.
For a message with a definite destination, adding an interface field into an adjacency list in the message to be processed, wherein the interface field is used for specifying a downstream member interface, and the specified downstream member interface is related to the specified destination, namely the downstream member interface is an aggregation interface which is required to pass through when the destination is reached.
Because the message to be processed comprises a local message and a forwarding message, two sending mechanisms are configured to realize the target member interface determined from all the downlink member interfaces based on the downlink member interface appointed by the adjacency list of the message to be processed.
If the message to be processed is a locally generated message, a local-local mechanism (based-local) is adopted, which includes: and inquiring whether an interface field for specifying a downlink member interface exists in the adjacent table, if so, taking the downlink member interface specified by the interface field in the adjacent table as a target member interface, and if not, taking a root port of the link aggregation uplink equipment as the target member interface.
If the message to be processed is a forwarding message, a forwarding mechanism (based-forward) is adopted, which includes: if the message to be processed is a forwarding message, inquiring whether an interface field for specifying a downlink member interface exists in the adjacency list;
if yes, taking a downstream member interface appointed by an interface field in the adjacency list as a target member interface;
if not, determining the target member interface from all the faultless downlink member interfaces by using a Hash algorithm.
The hash algorithm refers to a hash algorithm in a load balancing algorithm. It should be understood that the hash algorithm may be replaced by other load balancing algorithms, which is not the only implementation and the embodiment is not limited thereto.
In one embodiment, an ARP entry of an ARP module of a link aggregation uplink device further records an active state, that is, invalid (failure) or valid (no failure), of each aggregation member interface of a downlink network device of a cross-device link aggregation.
It should be appreciated that the drop member interface specified by the interface field in the adjacency list may be in an invalid state. After the step of using the member interface of the next link specified by the interface field in the adjacency list as the target member interface, the method further comprises the following steps: and inquiring ARP table entries of the link aggregation uplink equipment, and when the state identifier of the downlink member interface specified by the interface field in the adjacent table is invalid, determining a target member interface from all the downlink member interfaces without faults by adopting a Hash algorithm.
And S104, sending the message to be processed to the aggregation group through the member link corresponding to the target member interface.
Through the steps S102-S104, the message with a definite purpose can be accurately sent to the destination, and the situations of message packet loss or ping request failure can be reduced.
In another embodiment, when the message type of the message to be processed is a non-protocol message, the present invention further provides a message sending method, which can also improve the problem of packet loss or ping request failure caused by the original message sending method in a networking environment where cross-device link aggregation is performed.
The message sending mode is a destination sending mechanism (based-destination), and comprises the following steps: inquiring a next hop address and a destination address from an adjacency list of a message to be processed, and judging whether the next hop address is consistent with the destination address; if yes, taking the downstream member interface appointed by the interface field in the adjacency list as the target member interface; and if the messages to be processed are inconsistent, taking the root port of the link aggregation uplink device as a target member interface when the messages to be processed are locally generated messages, and determining the target member interface from all the faultless downlink member interfaces by utilizing a Hash algorithm when the messages to be processed are forwarding messages.
Similarly, after the step of using the member interface of the next link specified by the interface field in the adjacency list as the target member interface, the method further comprises the following steps: and inquiring ARP table entries of the link aggregation uplink equipment, and when the state identification of the downlink member interface designated by the interface field in the adjacent table is invalid, determining a target member interface from all the downlink member interfaces without faults by adopting a Hash algorithm.
The local mechanism (based-local), the forwarding mechanism (based-forward), and the destination sending mechanism (based-destination) may all be configured, or one or two configurations may be selected according to actual requirements, which is not specifically limited in this embodiment.
In the above cross-device link aggregation method, when performing message transmission and reception in link aggregation uplink devices and cross-device link aggregation, the validity (no failure) and invalidity (failure or down) of the member link have an important influence on smooth transmission and reception of the message. Therefore, in order to quickly know the condition of the member link (i.e. whether the member interface connected downstream and the member interface aggregated fail), referring to fig. 7, the method for aggregating the cross-device link provided by the embodiment of the present invention further includes the following steps.
And S106, establishing a session between the downlink member interface and the aggregation member interface of each member link.
And S107, monitoring all the sessions in real time, and judging whether each member link is connected or not according to the response condition of the sessions.
In detail, a Bidirectional Forwarding Detection (BFD) session is configured between a downstream member interface and an aggregation member interface of a member link, so that the session on the member link can be handshake, if the handshake is successful, it indicates that the member link has no fault, otherwise, it has a fault.
In fig. 5, when the ethernet aggregation link (including two member links) of the link aggregation uplink device a configures BFD, 2 BFD sessions need to be configured simultaneously, and the destination IP addresses are respectively designated as the aggregation interface IP addresses of the downlink network device B and the downlink network device C. And the downlink network equipment B and the downlink network equipment C also configure the BFD session under the aggregation interface, and after the configuration is finished, the BFD session is established for each member link to detect the fault.
When the line between the network device B and the network device C has a fault, the BFD session may also be detected when the member interface is not DOWN. When all member links between the downlink network equipment B and the downlink network equipment C are invalid, all aggregation member interfaces on the downlink network equipment B are set to be in an invalid state, and meanwhile, a peer-link interface between the downlink network equipment B and the downlink network equipment C is DOWN in a linkage mode, so that the downlink network equipment C is ensured not to send messages from the peer-link interface. If the peer-link interface is not dropped in the DOWN, the downlink network equipment C continues to send the message from the peer-link, and the downlink network equipment B does not have a valid member interface, so that the message is discarded.
And S108, if the member link cannot be communicated, setting the state identifier of the lower connection member interface of the member link as invalid, and updating the ARP table entry on the link aggregation upper connection equipment.
Through the steps S106 to S108, invalid member links and member interfaces can be detected in time, so as to avoid sending the message to the invalid member interfaces to a certain extent, and thus, the message is lost or fails to be sent.
The cross-device link aggregation method provided by the embodiment of the invention can ensure the normal operation of various protocols in the cross-device link aggregation system when protocols do not run between the downstream network devices in the aggregation group. Meanwhile, the models and functions of two devices for performing cross-device link aggregation are not required to be completely the same, any two devices can perform cross-device link aggregation, and any high-low end device can support cross-device link aggregation, so that the compatibility of cross-device link aggregation is greatly improved, and the implementation cost of cross-device link aggregation is reduced.
Based on the above concept of the cross-device link aggregation method, referring to fig. 8, in an embodiment, the present invention further provides a cross-device link aggregation apparatus 130, which is applied to the link aggregation uplink device 110 in the cross-device link aggregation system 100 provided in the foregoing embodiment, where the cross-device link aggregation apparatus 130 includes a processing module 140 and a transmission module 150.
The processing module 140 is configured to determine a packet type of the packet to be processed, and when the packet type is a protocol packet, copy the packet to be processed for each member link.
The transmission module 150 is configured to send the to-be-processed packet to the downlink network device corresponding to the member link through each member link, so that each downlink network device obtains link synchronization information through the to-be-processed packet, and thus link information between the downlink network devices is consistent.
Further, the cross-device link aggregation apparatus 130 may further include a detection module 160 configured to:
establishing a session between a downstream member interface and an aggregation member interface of each member link;
monitoring all sessions in real time, and judging whether each member link is connected or not according to the response condition of the sessions; and if the member link cannot be communicated, setting the state identifier of the downlink member interface of the member link as invalid, and updating an ARP table entry on the link aggregation uplink equipment.
Based on the cross-device link aggregation device 130, all the downstream network devices in the aggregation group can realize data synchronization without the need that the devices of the cross-device link have the same model and function, and the normal realization of the subsequent link transmission of the cross-device link aggregation is ensured, so that the compatibility of the cross-device link aggregation is improved. Meanwhile, the configuration complexity of the cross-device link aggregation can be reduced, and the implementation cost of the cross-device link aggregation is reduced.
For specific limitations of the cross-device link aggregation apparatus 130, reference may be made to the above limitations on the test case conversion method, which is not described herein again. The various modules in the cross-device link aggregation apparatus 130 described above may be implemented in whole or in part by software, hardware, and combinations thereof.
When the link aggregation uplink device 110 is a communication device in a physical sense, the above modules may be embedded in hardware or may be independent from a processor in the communication device, or may be stored in a memory of the communication device in a software form, so that the processor invokes and executes operations corresponding to the above modules.
When the link aggregation uplink device 110 is a virtualized device formed by virtualizing a plurality of communication devices, the modules may be embedded in hardware or may be independent of a processor in each communication device, or may be stored in a memory of each physical device in software, so that the processor calls and executes operations corresponding to the modules.
In one embodiment, an electronic device 170 is provided, the internal structure of which may be as shown in FIG. 9. The electronic device 170 includes a processor, memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the electronic device 170 is configured to provide computing and control capabilities. The memory of the communication device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device 170 is used for performing wired or wireless communication with an external terminal, and the wireless communication may be implemented through WIFI, an operator network, near Field Communication (NFC), or other technologies. The computer program when executed by a processor implements a cross device link aggregation method.
It will be understood by those skilled in the art that the configuration shown in fig. 9 is a block diagram of only a portion of the configuration associated with the inventive arrangements, and does not constitute a limitation on the electronic device 170 to which the inventive arrangements are applied, and that a particular electronic device 170 may include more or fewer components than those shown in fig. 9, or may combine certain components, or have a different arrangement of components.
In one embodiment, the cross-device link aggregation apparatus 130 provided by the present invention can be implemented in a form of a computer program, and the computer program can be run on the electronic device 170 shown in fig. 9. The memory of the electronic device 170 may store therein various program modules constituting the cross device link aggregation apparatus 130, such as the processing module 140 and the transmission module 150 shown in fig. 8. The computer program constituted by the respective program modules causes the processor to execute the steps described in this specification applied to the cross-device link aggregation method.
For example, the electronic device 170 shown in fig. 9 may perform steps S101-S103 by the processing module 140 in the cross-device link aggregation apparatus 130 shown in fig. 8. The electronic device 170 may perform step S105 through the transmission module 150.
In one embodiment, an electronic device 170 is provided comprising a memory storing a computer program and a processor implementing the following steps when the computer program is executed: determining the message type of the message to be processed, and when the message type is a protocol message, copying the message to be processed aiming at each member link; and respectively sending the message to be processed to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and the link information among the downlink network equipment is consistent.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, performs the steps of: determining the message type of the message to be processed, and when the message type is a protocol message, copying the message to be processed aiming at each member link; and respectively sending the message to be processed to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and the link information among the downlink network equipment is consistent.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cross-device link aggregation method is applied to a link aggregation uplink device which is connected with an aggregation group consisting of a plurality of downlink network devices through an aggregation link consisting of a plurality of member links, and comprises the following steps:
determining the message type of the message to be processed;
when the message type is a protocol message, copying the message to be processed aiming at each member link;
and respectively sending the message to be processed to the downlink network equipment corresponding to the member link through each member link, so that each downlink network equipment obtains link synchronization information through the message to be processed, and the link information among the downlink network equipment is consistent.
2. The cross-device link aggregation method according to claim 1, wherein the link aggregation uplink device is a single communication device or a virtualization device composed of at least two communication devices through link aggregation; each communication device comprises a plurality of downlink member interfaces, each downlink network device comprises at least one aggregation member interface, and each member link is formed by connecting one downlink member interface with one aggregation member interface;
when the message to be processed is an ARP request message, the step of sending the message to be processed to the downlink network device corresponding to the member link through each member link, so that each downlink network device obtains link synchronization information through the message to be processed includes:
respectively configuring the copied ARP request message to each downlink member interface of the link aggregation uplink equipment, and transmitting the ARP request message to downlink network equipment corresponding to the member link through the member link corresponding to each downlink member interface so as to enable each downlink network equipment to generate an ARP table entry according to member interface information and logic interface information of the aggregation member interface of the downlink network equipment;
and receiving and processing an ARP response message returned by each piece of the downstream network equipment aiming at the ARP request message, and learning the ARP table entry in the ARP response message.
3. The method according to claim 1, wherein when the packet to be processed is an OSPF packet, the step of sending the packet to be processed to a downstream network device corresponding to the member link through each member link, so that each downstream network device obtains link synchronization information through the packet to be processed includes:
and respectively configuring the copied OSPF messages to each member link, and transmitting the messages to be processed to the downlink network equipment corresponding to the member links so as to promote each downlink network equipment and the link aggregation uplink equipment to establish OSPF neighbors.
4. The cross-device link aggregation method of claim 2, further comprising:
when the message type of the message to be processed is a non-protocol message, determining a target member interface from all downlink member interfaces based on the downlink member interface appointed by the adjacency list of the message to be processed;
and sending the message to be processed to the aggregation group through a member link corresponding to the target member interface.
5. The method according to claim 4, wherein the step of determining a target member interface from all the downline member interfaces based on the downline member interfaces specified by the adjacency list of the packet to be processed comprises:
if the message to be processed is a locally generated message, inquiring whether an interface field for specifying a downlink member interface exists in the adjacency list, if so, taking the downlink member interface specified by the interface field in the adjacency list as a target member interface, and if not, taking a root port of the link aggregation uplink equipment as the target member interface;
and if the message to be processed is a forwarding message, inquiring whether an adjacent table has an interface field for specifying a downlink member interface, if so, taking the downlink member interface specified by the interface field in the adjacent table as a target member interface, and if not, determining the target member interface from all the downlink member interfaces without faults by utilizing a Hash algorithm.
6. The cross-device link aggregation method of claim 4, further comprising:
when the message type is a non-protocol message, inquiring a next hop address and a destination address from an adjacency list of the message to be processed, and judging whether the next hop address is consistent with the destination address;
if so, taking a downlink member interface specified by an interface field in the adjacency list as a target member interface;
if not, when the message to be processed is a locally generated message, the root port of the link aggregation uplink device is used as a target member interface, and when the message to be processed is a forwarding message, the target member interface is determined from all faultless downlink member interfaces by using a hash algorithm.
7. The cross-device link aggregation method of claim 2, further comprising:
establishing a session between a downstream member interface and an aggregation member interface of each member link;
monitoring all the sessions in real time, and judging whether each member link is communicated or not according to the response condition of the sessions;
and if the member link cannot be communicated, setting the state identifier of the downlink member interface of the member link as invalid, and updating the ARP table entry on the link aggregation uplink equipment.
8. A cross-device link aggregation system is characterized by comprising a link aggregation uplink device and an aggregation group formed by a plurality of downlink network devices connected with a plurality of member links of the link aggregation uplink device;
the link aggregation uplink device is used for realizing the cross-device link aggregation method according to any one of claims 1 to 7;
and the aggregation group is used for receiving and processing the message to be processed sent by the link aggregation uplink equipment.
9. The cross-device link aggregation device is applied to link aggregation uplink devices, the link aggregation uplink devices are connected with an aggregation group formed by a plurality of downlink network devices through aggregation links formed by a plurality of member links, and the cross-device link aggregation device comprises a processing module and a transmission module:
the processing module is used for determining the message type of the message to be processed, and when the message type is a protocol message, copying the message to be processed aiming at each member link;
and the transmission module is used for sending the message to be processed to the downlink network equipment corresponding to the member link through each member link so that each downlink network equipment obtains link synchronization information through the message to be processed, and therefore the link information among the downlink network equipment is consistent.
10. A computer-readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements a cross device link aggregation method as claimed in any one of claims 1 to 7.
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