CN106850385B - Method and device for detecting synchronization of two-layer forwarding table in stacking system - Google Patents
Method and device for detecting synchronization of two-layer forwarding table in stacking system Download PDFInfo
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- CN106850385B CN106850385B CN201710034766.5A CN201710034766A CN106850385B CN 106850385 B CN106850385 B CN 106850385B CN 201710034766 A CN201710034766 A CN 201710034766A CN 106850385 B CN106850385 B CN 106850385B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4675—Dynamic sharing of VLAN information amongst network nodes
Abstract
The invention provides a method and a device for detecting synchronization of a two-layer forwarding table in a stacking system. The method comprises the following steps: matching and searching in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a first matching and searching result; packaging the first matching search result in a header file of the message in a field form; and sending the message to a subsequent forwarding chip in a message forwarding path so that the subsequent forwarding chip can determine whether to trigger an asynchronous event according to the first matching search result. The invention can automatically detect the synchronization state of the stacking members, so that the stacking members can synchronize the forwarding tables of the second layer according to the synchronization state of the stacking members.
Description
Technical Field
The invention relates to the technical field of computer networks, in particular to a method and a device for detecting synchronization of a two-layer forwarding table in a stacking system.
Background
The stacking system is a logic device formed by sequentially interconnecting more than two switches through stacking links, and the topology of the stacking system can be a ring topology or a chain topology.
In the existing stacking system, it is usually necessary to perform MAC address synchronization between stacking members, for example, the invention patent application with patent application number 201310348697.7 entitled "method and apparatus for synchronizing MAC address information in stacking system" proposes to use a periodic broadcast method to solve the synchronization problem of the two-layer forwarding table in the stacking system, that is, periodically broadcast a MAC address synchronization message to each stacking member in the stacking system, so as to facilitate the synchronization of MAC addresses by each stacking member.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
the prior art does not detect the synchronization state of the stacking members in the stacking system, and directly adopts a periodic broadcast mode to synchronize the two-layer forwarding table, so that the periodic broadcast can only completely synchronize the whole stacking system and cannot synchronize the two-layer forwarding table as required for the stacking members.
Disclosure of Invention
The method and the device for detecting the synchronization of the two-layer forwarding table in the stacking system can automatically detect the synchronization state of the stacking members so as to facilitate the stacking members to synchronize the two-layer forwarding table according to the synchronization state of the stacking members.
In a first aspect, the present invention provides a method for detecting synchronization of a two-layer forwarding table in a stacking system, including:
matching and searching in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a first matching and searching result;
packaging the first matching search result in a header file of the message in a field form;
and sending the message to a subsequent forwarding chip in a message forwarding path so that the subsequent forwarding chip can determine whether to trigger an asynchronous event according to the first matching search result.
Optionally, the performing matching lookup in the second-layer forwarding table according to the MAC address and the VLAN ID carried in the received packet to obtain a first matching lookup result includes:
if the MAC address and the VLAN ID are not found in the two-layer forwarding table, the first matching finding result is successful matching;
and if the MAC address and the VLAN ID are found in the two-layer forwarding table, the first matching finding result is matching failure.
Optionally, encapsulating the first matching search result in a header file of the packet in a field form includes:
packaging a first field into a header file of the message, or packaging a second field into the header file of the message;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
In a second aspect, the present invention provides a method for detecting synchronization of a two-layer forwarding table in a stacking system, including:
receiving a message sent by a previous forwarding chip in a message forwarding path;
reading a header file of the message to obtain a first matching search result;
matching and searching in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the message to obtain a second matching and searching result;
comparing the first matching search result with the second matching search result;
determining whether to trigger an asynchronous event according to the comparison result;
the first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
Optionally, the determining whether to trigger the out-of-sync event according to the comparison result includes:
and if the first matching search result is different from the second matching search result, determining to trigger an asynchronous event.
In a third aspect, the present invention provides a device for detecting synchronization of a two-layer forwarding table in a stacking system, including:
the matching search module is used for performing matching search in the second-layer forwarding table according to the MAC address and the Virtual Local Area Network Identifier (VLANID) carried in the received message to obtain a first matching search result;
the encapsulation module is used for encapsulating the first matching search result obtained by the matching search module in a header file of the message in a field form;
and the sending module is used for sending the message to a subsequent forwarding chip in a message forwarding path so as to facilitate the subsequent forwarding chip to determine whether to trigger the asynchronous event according to the first matching search result.
Optionally, the matching lookup module is configured to obtain the first matching lookup result that is successfully matched when the MAC address and the VLAN ID are found in the two-layer forwarding table, or obtain the first matching lookup result that is unsuccessfully matched when the MAC address and the VLAN ID are not found in the two-layer forwarding table. Optionally, the encapsulating module is configured to encapsulate the first field into the header file of the packet, or encapsulate the second field into the header file of the packet;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
In a fourth aspect, the present invention provides a device for detecting synchronization of a two-layer forwarding table in a stacking system, including:
the receiving module is used for receiving the message sent by the previous forwarding chip in the message forwarding path;
the reading module is used for reading the header file of the message to obtain a first matching search result;
the acquisition module is used for carrying out matching search in a second-layer forwarding table according to the MAC address carried in the message and the VLAN ID so as to obtain a second matching search result;
the comparison module is used for comparing the first matching search result with the second matching search result;
the determining module is used for determining whether to trigger the asynchronous event according to the comparison result;
the first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
Optionally, the determining module is configured to determine that an out-of-sync event is triggered when the first matching search result is different from the second matching search result.
The embodiment of the invention provides a method and a device for detecting synchronization of a two-layer forwarding table in a stacking system, which are used for matching and searching in the two-layer forwarding table according to an MAC address and a virtual local area network identification (VLAN ID) carried in a received message to obtain a first matching and searching result; packaging the first matching search result in a header file of the message in a field form; and sending the message to a subsequent forwarding chip in a message forwarding path so that the subsequent forwarding chip can determine whether to trigger an asynchronous event according to the first matching search result. Compared with the prior art, the method can automatically detect the synchronization state of the stacking members, so that the stacking members can synchronize the two-layer forwarding table as required according to the synchronization state of the stacking members.
Drawings
Fig. 1 is a flowchart illustrating a method for detecting synchronization of a two-layer forwarding table in a stacking system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for detecting synchronization of two-layer forwarding tables in a stacking system according to another embodiment of the present invention;
fig. 3 is a diagram illustrating a message forwarding path formed by three forwarding chips as an example, and details a method for detecting synchronization of a two-layer forwarding table in a stacking system according to the present invention;
fig. 4 is a schematic structural diagram of a detection apparatus for synchronization of a two-layer forwarding table in a stacking system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a detection apparatus for synchronization of two-layer forwarding tables in a stacking system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for detecting synchronization of a two-layer forwarding table in a stacking system, as shown in fig. 1, the method comprises the following steps:
s11, matching and searching in the two-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a first matching and searching result.
S12, encapsulating the first matching search result in a header file of the message in a field form.
S13, sending the message to a subsequent forwarding chip in the message forwarding path, so that the subsequent forwarding chip can determine whether to trigger the asynchronous event according to the first matching search result.
In the method for detecting synchronization of a two-layer forwarding table in a stacking system provided by the embodiment of the invention, in the process of forwarding a message, a matching search result of an MAC address and a VLAN ID (virtual local area network identifier) is added in a message header file through a first forwarding chip, so that a subsequent forwarding chip can determine whether to trigger an asynchronous event according to the matching search result packaged in the message header file.
Optionally, step S11 specifically includes:
if the MAC address and the VLAN ID are found in the two-layer forwarding table, the first matching finding result is successful matching;
and if the MAC address and the VLAN ID are not found in the two-layer forwarding table, the first matching search result is matching failure.
Optionally, step S12 specifically includes:
packaging a first field into a header file of the message, or packaging a second field into the header file of the message;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
The invention provides a method for detecting synchronization of a two-layer forwarding table in a stacking system, as shown in fig. 2, the method comprises the following steps:
and S21, receiving the message sent by the previous forwarding chip in the message forwarding path.
And S22, reading the header file of the message to obtain a first matching search result.
S23, matching and searching in the two-layer forwarding table according to the MAC address and the VLAN ID carried in the message to obtain a second matching and searching result.
S24, comparing the first matching search result with the second matching search result.
And S25, determining whether the asynchronous event is triggered according to the comparison result.
The first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
In the method for detecting synchronization of a two-layer forwarding table in a stacking system provided by the embodiment of the invention, in the process of forwarding a message, a matching search result obtained from a message header file is compared with a result of matching search of an MAC address and a VLAN ID of a virtual local area network so as to determine whether to trigger an asynchronous event.
Optionally, the step S25 specifically includes: and if the first matching search result is different from the second matching search result, determining to trigger an asynchronous event.
The following describes in detail the method for detecting synchronization of a two-layer forwarding table in a stacking system by taking a packet forwarding path composed of three forwarding chips as an example, and as shown in fig. 3, the method is a schematic diagram of the packet forwarding path composed of three forwarding chips, that is, the packet forwarding path is: forwarding chip a → forwarding chip B → forwarding chip C, the specific flow includes:
1) after receiving the message, the forwarding chip A performs matching lookup in a two-layer forwarding table according to the MAC address and the VLAN ID carried in the message to obtain a first matching lookup result.
The method specifically comprises the following steps: if the MAC address and the VLAN ID are found in the second-layer forwarding table, the first matching finding result is successful matching;
and if the MAC address and the VLAN ID are not found in the two-layer forwarding table, the first matching search result is matching failure.
2) And encapsulating the first matching search result in a header file of the message in a field form.
The method specifically comprises the following steps: encapsulating a HIT field into the header file of the message, or encapsulating a NOTIT field into the header file of the message;
the HIT field is used to indicate that the first matching search result is a successful match, and the not field is used to indicate that the first matching search result is a failed match.
3) And sending the message to a forwarding chip B.
4) And the forwarding chip B reads the header file of the received message to obtain the first matching search result.
5) And the forwarding chip B performs matching search in the two-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a matching search result of the forwarding chip B.
6) And the forwarding chip B compares the first matching search result with the matching search result of the forwarding chip B to determine whether to trigger the asynchronous event.
The method specifically comprises the following steps: and triggering an asynchronous event if the first matching search result is different from the self matching search result, namely triggering the asynchronous event if the first matching search result is HIT and the self matching search result is NOTIT, or triggering the asynchronous event if the first matching search result is NOTIT and the self matching search result is HIT.
For example, the forwarding chip B may report an out-of-sync event to the CPU, so that the CPU broadcasts an MAC address synchronization packet to each stack member in the stack system, so that each stack member performs MAC address synchronization.
7) And the forwarding chip B sends the message to the forwarding chip C.
8) And the forwarding chip C reads the header file of the received message to obtain the first matching search result.
9) And the forwarding chip C performs matching search in the two-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a matching search result of the forwarding chip C.
10) And the forwarding chip C compares the first matching search result with the matching search result of the forwarding chip C to determine whether to trigger the asynchronous event.
The method specifically comprises the following steps: and triggering an asynchronous event if the first matching search result is different from the self matching search result, namely triggering the asynchronous event if the first matching search result is HIT and the self matching search result is NOTIT, or triggering the asynchronous event if the first matching search result is NOTIT and the self matching search result is HIT.
For example, the forwarding chip C may report an out-of-sync event to the CPU, so that the CPU broadcasts an MAC address synchronization packet to each stack member in the stack system, so that each stack member performs MAC address synchronization.
An embodiment of the present invention further provides a device for detecting synchronization of a two-layer forwarding table in a stacking system, and as shown in fig. 4, the device includes:
a matching search module 41, configured to perform matching search in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the received packet to obtain a first matching search result;
an encapsulating module 42, configured to encapsulate the first matching search result obtained by the matching search module 41 in a header file of the packet in a field form;
a sending module 43, configured to send the packet to a subsequent forwarding chip in the packet forwarding path, so that the subsequent forwarding chip determines whether to trigger an asynchronous event according to the first matching search result.
In the detection device for synchronization of the two-layer forwarding table in the stacking system provided by the embodiment of the invention, in the process of forwarding the message, the matching search result of the MAC address and the VLAN ID is added in the message header file through the first forwarding chip, so that the subsequent forwarding chip can determine whether to trigger an asynchronous event according to the matching search result packaged in the message header file.
Optionally, the matching and searching module 41 is configured to obtain the first matching and searching result that is successfully matched when the MAC address and the VLAN ID are found in the two-layer forwarding table, or obtain the first matching and searching result that is unsuccessfully matched when the MAC address and the VLAN ID are not found in the two-layer forwarding table.
Optionally, the encapsulating module 42 is configured to encapsulate the first field into the header file of the packet, or encapsulate the second field into the header file of the packet;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
An embodiment of the present invention further provides a device for detecting synchronization of a two-layer forwarding table in a stacking system, and as shown in fig. 5, the device includes:
the receiving module 51 is configured to receive a message sent by a previous forwarding chip in the message forwarding path.
The reading module 52 is configured to read a header file of the packet to obtain a first matching search result.
And the obtaining module 53 is configured to perform matching lookup in a two-layer forwarding table according to the MAC address and the VLAN ID carried in the packet to obtain a second matching lookup result.
A comparing module 54, configured to compare the first matching search result with the second matching search result.
And a determining module 55, configured to determine whether to trigger the out-of-sync event according to the comparison result.
The first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
In the detection device for synchronization of the two-layer forwarding table in the stack system provided by the embodiment of the invention, in the message forwarding process, the matching search result obtained from the message header file is compared with the result of matching search of the MAC address and the VLAN ID of the virtual local area network by the self to determine whether to trigger the asynchronous event, so that compared with the prior art, the synchronization state of the stack members can be automatically detected, and the stack members can conveniently perform on-demand synchronization of the two-layer forwarding table according to the synchronization state of the stack members.
Optionally, the determining module 55 is configured to determine that an out-of-sync event is triggered when the first matching search result is different from the second matching search result.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for detecting synchronization of a two-layer forwarding table in a stacking system is characterized by comprising the following steps:
matching and searching in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a first matching and searching result;
packaging the first matching search result in a header file of the message in a field form;
sending the message to a subsequent forwarding chip in a message forwarding path, so that the subsequent forwarding chip performs matching lookup in a two-layer forwarding table according to the MAC address carried in the message and the VLAN ID to obtain a second matching lookup result, comparing the first matching lookup result with the second matching lookup result, determining whether to trigger an asynchronous event according to the comparison result, and reporting the asynchronous event to a CPU if the asynchronous event is determined to be triggered, so that the CPU broadcasts the MAC address synchronization message to each stacking member in a stacking system, and each stacking member can perform MAC address synchronization.
2. The method of claim 1, wherein performing matching lookup in a two-layer forwarding table according to the MAC address and the VLAN ID carried in the received packet to obtain a first matching lookup result comprises:
if the MAC address and the VLAN ID are found in the two-layer forwarding table, the first matching finding result is successful matching;
and if the MAC address and the VLAN ID are not found in the two-layer forwarding table, the first matching search result is matching failure.
3. The method of claim 2, wherein encapsulating the first match lookup result in a header file of the packet in a field form comprises:
packaging a first field into a header file of the message, or packaging a second field into the header file of the message;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
4. A method for detecting synchronization of a two-layer forwarding table in a stacking system is characterized by comprising the following steps:
receiving a message sent by a previous forwarding chip in a message forwarding path;
reading a header file of the message to obtain a first matching search result;
matching and searching in a second-layer forwarding table according to the MAC address and the VLAN ID carried in the message to obtain a second matching and searching result;
comparing the first matching search result with the second matching search result;
determining whether to trigger an asynchronous event according to the comparison result;
if the asynchronous event is determined to be triggered, reporting the asynchronous event to the CPU, so that the CPU broadcasts an MAC address synchronous message to each stacking member in the stacking system, and each stacking member can conveniently synchronize the MAC address;
the first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
5. The method of claim 4, wherein determining whether to trigger an out-of-sync event based on the comparison comprises:
and if the first matching search result is different from the second matching search result, determining to trigger an asynchronous event.
6. A device for detecting synchronization of two-layer forwarding tables in a stacking system is characterized by comprising:
the matching search module is used for performing matching search in the two-layer forwarding table according to the MAC address and the VLAN ID carried in the received message to obtain a first matching search result;
the encapsulation module is used for encapsulating the first matching search result obtained by the matching search module in a header file of the message in a field form;
a sending module, configured to send the packet to a subsequent forwarding chip in a packet forwarding path, so that the subsequent forwarding chip performs matching lookup in a two-layer forwarding table according to an MAC address and a VLAN ID carried in the packet to obtain a second matching lookup result, compares the first matching lookup result with the second matching lookup result, determines whether to trigger an asynchronous event according to the comparison result, and if it is determined that the asynchronous event is triggered, reports the asynchronous event to a CPU, so that the CPU broadcasts an MAC address synchronization packet to each stacking member in a stacking system, so that each stacking member performs MAC address synchronization.
7. The apparatus of claim 6, wherein the match lookup module is configured to obtain the first match lookup result that is successfully matched when the MAC address and the VLAN ID are found in the two-layer forwarding table, or obtain the first match lookup result that is unsuccessfully matched when the MAC address and the VLAN ID are not found in the two-layer forwarding table.
8. The apparatus according to claim 7, wherein the encapsulating module is configured to encapsulate a first field into a header file of the packet, or encapsulate a second field into the header file of the packet;
the first field is used for indicating that the first matching search result is a successful matching, and the second field is used for indicating that the first matching search result is a failed matching.
9. A device for detecting synchronization of two-layer forwarding tables in a stacking system is characterized by comprising:
the receiving module is used for receiving the message sent by the previous forwarding chip in the message forwarding path;
the reading module is used for reading the header file of the message to obtain a first matching search result;
the acquisition module is used for carrying out matching search in a second-layer forwarding table according to the MAC address carried in the message and the VLAN ID so as to obtain a second matching search result;
the comparison module is used for comparing the first matching search result with the second matching search result;
the determining module is used for determining whether an asynchronous event is triggered according to the comparison result, and reporting the asynchronous event to the CPU if the asynchronous event is determined to be triggered, so that the CPU broadcasts an MAC address synchronous message to each stacking member in the stacking system, and each stacking member can conveniently synchronize the MAC address;
the first matching search result is a matching search result obtained by matching search of a first forwarding chip in the forwarding path in a second-layer forwarding table according to an MAC address and a virtual local area network identifier (VLAN ID) carried in a message to be forwarded received by the first forwarding chip.
10. The apparatus of claim 9, wherein the means for determining determines to trigger an out-of-sync event when the first matching lookup result is different from the second matching lookup result.
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