CN106789713B - Message forwarding method and device - Google Patents
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- CN106789713B CN106789713B CN201710147015.4A CN201710147015A CN106789713B CN 106789713 B CN106789713 B CN 106789713B CN 201710147015 A CN201710147015 A CN 201710147015A CN 106789713 B CN106789713 B CN 106789713B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
Abstract
The invention provides a method and a device for forwarding a message, wherein the method comprises the following steps: receiving a message to be forwarded; screening out available links from the session forwarding table according to the session number of the session associated with each link, wherein the available links refer to links of which the session number of the associated session is within a preset session number range; if the target session to which the message to be forwarded belongs is not stored in the session forwarding table, associating the target session to one of the available links according to the routing table; and forwarding the message to be forwarded by using the available link associated with the target session. By applying the embodiment of the invention, the number of the sessions associated with each link in the session forwarding table is counted in real time, and the links with the number of the associated sessions conforming to the preset session number range are screened out as the available links to be associated with the new sessions, so that the link congestion caused by more sessions associated with a certain link is avoided, and the message forwarding efficiency is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for forwarding a packet.
Background
In network communication, a load balancing device is usually deployed between a server and a client device, and needs to provide physical support for message forwarding for a session between the client device and the server, and the message forwarding amount of the load balancing device is generally large, so that the message forwarding efficiency of the load balancing device is very important.
In the prior art, a session forwarding table is usually established in a load balancing device as an aid of a routing table to improve forwarding efficiency, and a correspondence between links and sessions is stored in the session forwarding table, where each link is associated with multiple sessions. When the message of any session stored in the session forwarding table needs to be forwarded by the load balancing device, the load balancing device queries a link corresponding to the session according to the session forwarding table, and forwards the message of the session through the queried link. However, since each link can be associated with multiple sessions, when the number of sessions associated with a certain link is large and new sessions are continuously established in the link, the link is congested due to the large number of sessions, and finally the message forwarding efficiency is reduced.
Disclosure of Invention
The embodiment of the invention provides a message forwarding method and device, which are used for solving the problem of low message forwarding efficiency in the prior art.
According to a first aspect of the embodiments of the present invention, a method for forwarding a packet is provided, where the method is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, and the session forwarding table stores a correspondence between links and sessions, where each link is associated with a plurality of sessions, and the session forwarding table also stores a session number of sessions associated with each link, which is counted in real time, and the method includes:
receiving a message to be forwarded;
screening out available links from the session forwarding table according to the session number of the session associated with each link, wherein the available links refer to links of which the session number of the associated session is within a preset session number range;
if the target session to which the message to be forwarded belongs is not stored in the session forwarding table, associating the target session to one of the available links according to the routing table;
and forwarding the message to be forwarded by using the available link associated with the target session.
According to a second aspect of the embodiments of the present invention, there is provided a packet forwarding apparatus, where the apparatus is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, and the session forwarding table stores a correspondence between links and sessions, where each link is associated with a plurality of sessions, and the session forwarding table also stores a session number of sessions associated with each link, where the session number is counted in real time, and the apparatus includes:
a receiving unit, configured to receive a packet to be forwarded;
the screening unit is used for screening available links from the session forwarding table according to the session number of the session associated with each link, wherein the available links refer to the links of which the session number of the associated session is within a preset session number range;
a correlation unit, configured to correlate, according to the routing table, a target session to which the packet to be forwarded belongs to one of the available links when the target session is not stored in the session forwarding table;
and the forwarding unit is used for forwarding the message to be forwarded by using the available link associated with the target session.
According to the technical scheme, the number of the sessions associated with each link in the session forwarding table is counted in real time, the links with the number of the associated sessions meeting the preset session number range are screened out to be available links for associating new sessions, link congestion caused by the fact that a certain link is associated with a large number of sessions is avoided, and the message forwarding efficiency is improved.
Drawings
Fig. 1 is a schematic view of an application scenario of a message forwarding method according to an embodiment of the present invention;
fig. 2 is a flowchart of an embodiment of a method for forwarding a packet according to the present invention;
fig. 3 is a flowchart of another embodiment of a method for forwarding a packet according to the present invention;
fig. 4 is a hardware structure diagram of a device in which the message forwarding apparatus of the present invention is located;
fig. 5 is a block diagram of an embodiment of a message forwarding apparatus according to the present invention.
Detailed Description
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable to those skilled in the art, the technical solutions in the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic view of an application scenario of a method for forwarding a packet according to an embodiment of the present invention, as shown in fig. 1, the application scenario includes: the system comprises client equipment, a server and load balancing equipment arranged between the client equipment and the server, wherein the load balancing equipment provides physical support for message forwarding for a session between the client equipment and the server.
In the prior art, a session forwarding table is usually established in the load balancing device as an aid of a routing table, so as to improve forwarding efficiency, and a correspondence between links and sessions is stored in the session forwarding table, where each link is associated with a plurality of sessions, and part of contents of the session forwarding table are shown in table 1:
| link 1 | Link 2 | Link 3 | Link 4 |
| Session 11 | Conversation 21 | Conversation 31 | Conversation 41 |
| Session 12 | Conversation 22 | Session 32 | Conversation 42 |
| Session 13 | Conversation 23 | Session 33 | |
| Session 14 | Session 24 | Conversation 34 | |
| Session 15 | Conversation 35 |
When the message of any session stored in the session forwarding table needs to be forwarded by the load balancing device, the load balancing device queries a link corresponding to the session according to the session forwarding table, and forwards the message of the session through the queried link. For example: when the message of the session 11 needs to be forwarded by the load balancing device, the load balancing device queries the link 1 corresponding to the session 11 according to the session forwarding table, and forwards the message of any session through the link 1. However, since each link can be associated with multiple sessions, when the number of sessions associated with a certain link is large and new sessions are continuously established in the link, the link is congested due to the large number of sessions, and finally the message forwarding efficiency is reduced.
The following describes an embodiment of the present invention in detail with reference to an application scenario shown in fig. 1.
Referring to fig. 2, fig. 2 is a flowchart of an embodiment of a method for forwarding a packet according to the present invention, where the method is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, and the session forwarding table stores a correspondence between links and sessions, where each link is associated with a plurality of sessions, and the session forwarding table also stores the number of sessions associated with each link, which is counted in real time, and the method includes the following steps:
step 201: and receiving a message to be forwarded.
Step 202: and screening out available links from the session forwarding table according to the session number of the session associated with each link, wherein the available links refer to the links of which the session number of the associated session is within a preset session number range.
In an optional example, the real-time statistical process of the number of sessions of the session associated with each link may be:
after the load balancing equipment is started, associating a session count for each link in the session forwarding table and setting the associated session count to be 0;
when a session is established, adding 1 to the session count of a link corresponding to the established session;
and after the aging time of the session is reached, subtracting 1 from the session count of the link corresponding to the session with the aging time.
In an optional example, the screening process of the available links may be:
reading the number of the sessions associated with any link in a circulating manner, and if the number of the sessions associated with any link is within a preset safety interval, marking any link as an available link;
and circularly reading the number of the sessions associated with any link, and marking any link as an unavailable link if the number of the sessions associated with any link is not within a preset safety interval.
Step 203: and if the target session to which the message to be forwarded belongs is not stored in the session forwarding table, associating the target session to one of the available links according to the routing table.
In an optional example, if the target session to which the packet to be forwarded belongs is stored in the session forwarding table, the target link corresponding to the target session is obtained according to the target session and the correspondence between the link and the session stored in the session forwarding table.
Step 204: and forwarding the message to be forwarded by using the available link associated with the target session.
In this step, if the target link corresponding to the target session is obtained in step 203 according to the target session and the corresponding relationship between the links and the sessions stored in the session forwarding table, the message to be forwarded is forwarded by using the target link.
According to the technical scheme, the number of the sessions associated with each link in the session forwarding table is counted in real time, the links with the number of the associated sessions meeting the preset session number range are screened out to be available links for associating new sessions, link congestion caused by the fact that a certain link is associated with a large number of sessions is avoided, and the message forwarding efficiency is improved.
Referring to fig. 3, fig. 3 is a flowchart of another embodiment of a method for forwarding a packet according to the present invention. Compared with the embodiment shown in fig. 2, the embodiment describes in detail the process of real-time statistics of the number of sessions in a session forwarding table and the screening process of available links, and the method is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, the session forwarding table stores the correspondence between links and sessions, each link is associated with a plurality of sessions, and the session forwarding table also stores the number of sessions associated with each link, which is counted in real time, and the method includes the following steps:
step 301: and receiving a message to be forwarded.
Step 302: after the load balancing device is started, a session count is associated for each link in the session forwarding table and the associated session count is set to 0.
Step 303: and at the time of session establishment, adding 1 to the session count of the link corresponding to the established session.
Step 304: and after the aging time of the session is reached, subtracting 1 from the session count of the link corresponding to the session with the aging time.
Step 305: and circularly reading the number of the sessions associated with any link, and marking any link as an available link if the number of the sessions associated with any link is within a preset safety interval.
In an optional example, the step may further loop to read the session number associated with any link, and mark any link as an unavailable link if the session number associated with any link is not within a preset safety interval.
In another alternative example, the preset safety interval may be statistically derived from historical data of the link.
Step 306: and judging whether the target session to which the message to be forwarded belongs is stored in the session forwarding table, if so, executing step 307, and if not, executing step 308.
In an optional example, five-tuple (source IP, destination IP, source port, destination port, transport layer protocol) information of a packet corresponding to each session may be stored in a session forwarding table, and when it is required to determine whether a target session to which the packet to be forwarded belongs is stored in the session forwarding table, it is determined whether the five-tuple information of the packet to be forwarded matches five-tuple information of any session in the session forwarding table, and if it matches, it is determined that the target session to which the packet to be forwarded belongs is the any session.
Step 307: according to the target session and the corresponding relationship between the links and the sessions stored in the session forwarding table, the target link corresponding to the target session is obtained, and then step 309 is executed.
Step 308: and associating the target session to one of the available links according to the routing table, and using the associated link as a target link for forwarding the message to be forwarded.
Step 309: and forwarding the message to be forwarded by using the target link.
According to the technical scheme, the number of the sessions associated with each link in the session forwarding table is counted in real time, the links with the number of the associated sessions meeting the preset session number range are screened out to be available links for associating new sessions, link congestion caused by the fact that a certain link is associated with a large number of sessions is avoided, and the message forwarding efficiency is improved.
The following describes an embodiment of the present invention with a specific application example, which is described in conjunction with the application scenario shown in fig. 1, where it is assumed that part of contents of a session forwarding table stored in the load balancing device shown in fig. 1 are shown in table 2:
as can be seen from table 3, the session forwarding table stores the correspondence between the link and the session and the five-tuple of the packet corresponding to the session, where link 1 is associated with 3 sessions, link 2 is associated with 2 sessions, and link 3 is associated with 1 session. The statistical procedure for the number of sessions per link shown is as follows:
after the load balancing equipment is started, associating a session count for a link 1, a link 2 and a link 3 in a session forwarding table respectively and setting the associated session count to be 0;
when a session is established, adding 1 to the session count of a link corresponding to the established session;
and after the aging time of the session is reached, subtracting 1 from the session count of the link corresponding to the session with the aging time.
The detection procedure of the available flag for each link shown is as follows:
and circularly reading the number of the sessions associated with the link 1, the link 2 and the link 3, and marking any link as an available link if the number of the sessions associated with the link is within a preset safety interval. And if the number of the sessions associated with any link is not within the preset safety interval, marking the link as an unavailable link.
Suppose that message _89757 now needs to be forwarded, its five-tuple is shown in table 3:
| message numbering | Protocol | Source IP | Source MAC | Destination IP | Destination MAC |
| 89757 | TCP | 192.168.2.2 | 0000-0000-0002 | 192.168.2.1 | 0000-0000-0005 |
By applying the embodiment of the invention, the forwarding flow of the message by the load balancing equipment is as follows:
receiving a message to be forwarded: message _ 89757;
comparing the five-element group of the message _89757 with the five-element group corresponding to the session stored in the session forwarding table to obtain that the target session corresponding to the message _89757 is not stored in the session forwarding table;
after a routing table in the load balancing equipment is inquired, a target session is associated to a link 3 in a session forwarding table;
forward message _89757 using link 3;
corresponding to the embodiment of the message forwarding method, the invention also provides an embodiment of a message forwarding device.
The embodiment of the message forwarding device can be applied to load balancing equipment. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the nonvolatile memory into the memory for operation through the processor of the device where the software implementation is located as a logical means. In terms of hardware, as shown in fig. 4, the hardware structure diagram of the device for forwarding a packet according to the present invention is a hardware structure diagram, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 4, the device where the device is located in the embodiment may also include other hardware according to the actual function of the device, which is not described again.
Referring to fig. 5, a block diagram of an embodiment of a message forwarding apparatus according to the present invention is shown, where the apparatus is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, and the session forwarding table stores a correspondence between links and sessions, where each link is associated with a plurality of sessions, and the session forwarding table also stores a session number of sessions associated with each link, where the session number is counted in real time, and the apparatus includes: a receiving unit 510, a screening unit 520, an association unit 530, and a forwarding unit 540.
The receiving unit 510 is configured to receive a packet to be forwarded;
a screening unit 520, configured to screen out, from the session forwarding table, an available link according to the session number of the session associated with each link, where the available link is a link whose session number of the associated session is within a preset session number range;
a correlation unit 530, configured to, when a target session to which the packet to be forwarded belongs is not stored in the session forwarding table, correlate the target session to one of the available links according to the routing table;
a forwarding unit 540, configured to forward the packet to be forwarded by using the available link associated with the target session.
According to the technical scheme, the number of the sessions associated with each link in the session forwarding table is counted in real time, the links with the number of the associated sessions meeting the preset session number range are screened out to be available links for associating new sessions, link congestion caused by the fact that a certain link is associated with a large number of sessions is avoided, and the message forwarding efficiency is improved.
In an optional example, the apparatus further comprises (not shown in fig. 5): a unit is obtained.
An obtaining unit, configured to obtain, when a target session to which the packet to be forwarded belongs is stored in the session forwarding table, a target link corresponding to the target session according to the target session and a correspondence between links and sessions stored in the session forwarding table;
the forwarding unit 540 is further configured to:
and forwarding the message to be forwarded by using the target link.
In another optional example, the apparatus further comprises (not shown in fig. 5): a conversation count association unit and a conversation count maintenance unit.
The session count association unit is configured to associate a session count for each link in the session forwarding table after the load balancing device is started, and set the associated session count to 0;
the session count maintenance unit is used for adding 1 to the session count of the link corresponding to the established session when the session is established; and the method is also used for subtracting 1 from the session count of the link corresponding to the session with the aging time after the aging time of the session is reached.
In another alternative example, the screening unit 520 includes (not shown in fig. 5): a session number reading subunit and a link marking subunit.
The session number reading subunit is used for circularly reading the session number associated with any link;
and the link marking subunit is used for marking any link as an available link when the number of the sessions associated with the link is within a preset safety interval.
In another optional example, the link marking subunit (not shown in fig. 5) is further configured to:
and circularly reading the session number associated with any link, and marking the link as an unavailable link if the session number associated with the link is not within a preset safety interval.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the invention. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for forwarding a message is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, the session forwarding table stores a corresponding relationship between links and sessions, each link is associated with a plurality of sessions, and the session forwarding table also stores the number of sessions associated with each link, which is counted in real time, the method includes:
receiving a message to be forwarded;
circularly reading the session number associated with any link from the session forwarding table, and marking any link as an available link if the session number associated with any link is within a preset safety interval;
if the target session to which the message to be forwarded belongs is not stored in the session forwarding table, associating the target session to one of the available links according to the routing table;
and forwarding the message to be forwarded by using the available link associated with the target session.
2. The method of claim 1, further comprising:
if the target session to which the message to be forwarded belongs is stored in the session forwarding table, acquiring a target link corresponding to the target session according to the target session and the corresponding relationship between the link and the session stored in the session forwarding table;
and forwarding the message to be forwarded by using the target link.
3. The method of claim 1, wherein the session forwarding table further stores a session number associated with each link with real-time statistics, and comprises:
after the load balancing equipment is started, associating a session count for each link in the session forwarding table and setting the associated session count to be 0;
when a session is established, adding 1 to the session count of a link corresponding to the established session;
and after the aging time of the session is reached, subtracting 1 from the session count of the link corresponding to the session with the aging time.
4. The method of claim 1, further comprising:
and circularly reading the session number associated with any link, and marking the link as an unavailable link if the session number associated with the link is not within a preset safety interval.
5. A message forwarding device is applied to a load balancing device, the load balancing device establishes a routing table and a session forwarding table, the session forwarding table stores a corresponding relationship between links and sessions, each link is associated with a plurality of sessions, and the session forwarding table also stores the session number of the sessions associated with each link, which is counted in real time, and the device comprises:
a receiving unit, configured to receive a packet to be forwarded;
the screening unit is used for circularly reading the session number associated with any link from the session forwarding table, and if the session number associated with any link is within a preset safety interval, marking any link as an available link;
a correlation unit, configured to correlate, according to the routing table, a target session to which the packet to be forwarded belongs to one of the available links when the target session is not stored in the session forwarding table;
and the forwarding unit is used for forwarding the message to be forwarded by using the available link associated with the target session.
6. The apparatus of claim 5, further comprising:
an obtaining unit, configured to obtain, when a target session to which the packet to be forwarded belongs is stored in the session forwarding table, a target link corresponding to the target session according to the target session and a correspondence between links and sessions stored in the session forwarding table;
the forwarding unit is further configured to:
and forwarding the message to be forwarded by using the target link.
7. The apparatus of claim 5, further comprising:
a session count association unit, configured to associate a session count for each link in the session forwarding table after the load balancing device is started, and set the associated session count to 0;
the session count maintenance unit is used for adding 1 to the session count of the link corresponding to the established session when the session is established; and the method is also used for subtracting 1 from the session count of the link corresponding to the session with the aging time after the aging time of the session is reached.
8. The apparatus of claim 5, wherein the link marking subunit is further configured to:
and circularly reading the session number associated with any link, and marking the link as an unavailable link if the session number associated with the link is not within a preset safety interval.
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| CN108170533A (en) * | 2017-12-27 | 2018-06-15 | 杭州迪普科技股份有限公司 | The processing method and processing device of message, computer readable storage medium |
| CN109639802B (en) * | 2018-12-18 | 2021-11-02 | 杭州迪普科技股份有限公司 | Link statistics management method and device |
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| US9232027B2 (en) * | 2008-08-25 | 2016-01-05 | International Business Machines Corporation | TCP connection resource diversity using tunable geometric series |
| CN103067293B (en) * | 2012-12-31 | 2017-03-22 | 北京京东世纪贸易有限公司 | Method and system for multiplex and connection management of a load balancer |
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