CN108616463B - Message processing method and switch - Google Patents

Message processing method and switch Download PDF

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CN108616463B
CN108616463B CN201810377383.2A CN201810377383A CN108616463B CN 108616463 B CN108616463 B CN 108616463B CN 201810377383 A CN201810377383 A CN 201810377383A CN 108616463 B CN108616463 B CN 108616463B
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message
protocol type
switch
preset
matched
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CN108616463A (en
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赵海峰
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Hangzhou H3C Technologies Co Ltd
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Hangzhou H3C Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H04L49/201—Multicast operation; Broadcast operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/354—Switches specially adapted for specific applications for supporting virtual local area networks [VLAN]

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

The embodiment of the application provides a message processing method and a switch, wherein the method comprises the following steps: the switch judges whether the destination address of the received message is a broadcast address; if the address is the broadcast address, determining whether the protocol type of the message is matched with the preset protocol type according to the message characteristics included in the preset ACL; if the message is matched with the VXLAN instance, a target broadcast domain corresponding to the VXLAN instance to which the message belongs is obtained from a chip of the switch; the message is broadcast in the target broadcast domain. By applying the technical scheme provided by the embodiment of the application, the negative influence caused by closing the broadcasting function of the VXLAN is reduced, and meanwhile, the influence on the distribution and use of other service table entries is reduced.

Description

Message processing method and switch
Technical Field
The present application relates to the field of communications technologies, and in particular, to a message processing method and an exchange.
Background
VXLAN (Virtual eXtensible Local Area Network) is a two-layer VPN (Virtual Private Network) technology based on an IP (Internet Protocol) Network and adopting a "MAC (Media Access Control) in UDP (User Datagram Protocol)" encapsulation form. To implement the message broadcast, each VXLAN corresponds to a broadcast domain and a VXLAN instance on the switch.
To eliminate VXLAN broadcast storms, the broadcast function corresponding to the VXLAN instance on the switch is typically turned off. Some messages depending on protocols forwarded by the VXLAN broadcast, for example, messages of protocols such as airplay (music player) and Bonjour (automatic connection) which are not configured with Processing procedures except for the VXLAN broadcast on the switch, or messages which need hardware for forwarding due to the performance of a Central Processing Unit (CPU) of the switch, may not be processed correctly.
Currently, in order to reduce the negative impact caused by turning off the broadcast function of VXLAN, an Access Control List (ACL) for a message that depends on VXLAN broadcast forwarding is configured on a switch, and each ACL includes a message feature, a VXLAN instance, and a broadcast domain. Since the broadcast domain of each VXLAN is different, each VXLAN is configured with one or more ACLs to set the broadcast domain for different protocols. And after receiving the message, the switch matches the message with the message characteristics included by the configured ACL and the VXLAN instance, and broadcasts the message in a broadcast domain included by the matched ACL.
By configuring the ACL, the negative impact caused by turning off the broadcasting function of VXLAN is reduced. However, ACL is a scarce resource in the switch, and the use of ACL in a large amount will affect the allocation and use of other service table entries.
Disclosure of Invention
An object of the embodiments of the present application is to provide a message processing method and a switch, so as to reduce negative effects caused by closing a broadcast function of a VXLAN and reduce influences on allocation and use of other service table entries. The specific technical scheme is as follows:
in order to achieve the above object, an embodiment of the present application provides a message processing method, which is applied to a switch, and the method includes:
judging whether the destination address of the received message is a broadcast address or not;
if the address is a broadcast address, determining whether the protocol type of the message is matched with a preset protocol type according to message characteristics included in a preset ACL;
if the message is matched with the VXLAN instance, acquiring a target broadcast domain corresponding to the VXLAN instance to which the message belongs from a chip of the switch;
broadcasting the message in the target broadcast domain.
In order to achieve the above object, an embodiment of the present application further provides a switch, including:
the judging module is used for judging whether the destination address of the received message is a broadcast address or not;
the analysis module is used for determining whether the protocol type of the message is matched with a preset protocol type according to the message characteristics included in the preset ACL when the judgment result of the judgment module is yes;
the acquisition module is used for acquiring a target broadcast domain corresponding to the VXLAN instance to which the message belongs from a chip of the switch when the analysis module determines that the protocol type of the message is matched with a preset protocol type;
and the broadcasting module is used for broadcasting the message in the target broadcasting domain.
In the embodiment of the application, the ACL including the message characteristics is preset in the switch, and the corresponding relation between the VXLAN instance and the broadcast domain is preset in the chip of the switch. After the exchanger receives the message, it can determine the VXLAN the message belongs to. If the destination address of the received message is a broadcast address, and the protocol type of the received message is determined to be matched with the preset protocol type according to the message characteristics included in the preset ACL, the switch acquires a target broadcast domain corresponding to the VXLAN to which the message belongs from the chip, and broadcasts the received message in the target broadcast domain.
Therefore, in the embodiment of the application, when broadcasting of the VXLAN is realized, only one ACL including message characteristics of the protocol needs to be configured for each protocol, and one ACL does not need to be configured for each protocol under each VXLAN instance, so that the usage amount of the ACL is reduced, and the negative influence caused by closing the broadcasting function of the VXLAN is reduced, and the distribution and use influence on other service table entries is reduced.
Of course, it is not necessary for any product or method of the present application to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first flowchart illustrating a message processing method according to an embodiment of the present application;
fig. 2 is a second flowchart of a message processing method according to an embodiment of the present application;
fig. 3 is a schematic diagram of a first structure of a switch according to an embodiment of the present application;
fig. 4 is a schematic diagram of a second structure of a switch according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Currently, to reduce the negative impact of turning off the broadcast function of VXLAN, an ACL is configured on the switch for each protocol under each VXLAN instance. For example, if there are currently two protocols that rely on VXLAN broadcast forwarding, protocol 01 and protocol 02, and there are currently two VXLAN instances, VXLAN01 instance and VXLAN02 instance, then 4 ACLs need to be configured, including: ACL01 for protocol 01 and ACL02 for protocol 02 under the VXLAN01 example, ACL03 for protocol 01 and ACL04 for protocol 02 under the VXLAN02 example.
One ACL includes message characteristics, VXLAN instances, and broadcast domains. The message characteristics are the message characteristics of the protocol corresponding to the ACL. The switch matches the received message with the message characteristics included in the ACL and the VXLAN instance, and broadcasts the message in the broadcast domain included in the matched ACL.
By configuring the ACL, the negative impact caused by turning off the broadcasting function of VXLAN is reduced. However, ACL is a scarce resource in the switch, and the use of ACL in a large amount will affect the allocation and use of other service table entries.
In order to reduce negative effects caused by closing the broadcast function of the VXLAN and reduce influences on allocation and use of other service table entries, the embodiment of the application provides a message processing method. Referring to fig. 1, fig. 1 is a schematic flowchart of a first message processing method according to an embodiment of the present application. The message processing method is applied to the switch and comprises the following steps:
step 101: and judging whether the destination address of the received message is a broadcast address. If it is a broadcast address, step 102 is performed.
Step 102: and determining whether the protocol type of the message is matched with the preset protocol type according to the message characteristics included in the preset ACL. If so, go to step 103.
Step 103: and acquiring a target broadcast domain corresponding to the VXLAN instance to which the message belongs from a chip of the switch.
Step 104: the message is broadcast in the target broadcast domain.
In the embodiment of the application, when broadcasting of the VXLAN is realized, only one ACL including the message characteristics of the protocol needs to be configured for each protocol, and one ACL does not need to be configured for each protocol under each VXLAN instance, so that the use amount of the ACL is reduced, and the distribution and use influence on other service table entries is reduced while the negative influence caused by closing the broadcasting function of the VXLAN is reduced.
In this embodiment, the switch receives the message, and may acquire, from the received message, information such as a destination address of the received message and a VXLAN instance to which the received message belongs. Here, the destination address of the message may be a destination IP (Internet Protocol) address and/or a destination MAC (Media Access Control) address of the message, and the like.
After the switch acquires the destination address, whether the destination address of the acquired message is a broadcast address can be determined according to the structure of the destination address. For example, the switch acquires the destination MAC address of the message from the message. And if the destination MAC address is FFFF, the switch determines the destination address of the acquired message as a broadcast address. Otherwise, the switch determines that the destination address of the acquired message is not a broadcast address.
And if the destination address of the received message is determined to be the broadcast address, the switch determines whether the protocol type of the message is matched with the preset protocol type according to the message characteristics included in the preset ACL.
If the switch determines that the destination address of the received message does not broadcast an address, the switch may look up a destination address table entry including the destination address of the received message from the address table. For example, the switch looks up a destination MAC address table entry from the MAC address table that includes the destination MAC address of the received message. Wherein, each address table item comprises the corresponding relation between the address and the destination output port. The address table may be obtained when the switch performs address learning.
If the switch finds the destination address table entry, the switch unicasts the received message through an output port included in the destination address table entry. If the switch does not find the destination address table entry, the switch can determine that the received message is not a unicast message, and further determine whether the protocol type of the received message is matched with a preset protocol type.
In an embodiment of the present application, the switch may match a feature of a received packet with a packet feature included in a preset ACL by using a TCAM (ternary content addressable memory) to determine whether a protocol type of the received packet matches a preset protocol type. The message characteristics may include information such as ethernet type information, a destination MAC address, or a TCP/UDP (Transmission Control Protocol/User data program, TCP/User Datagram Protocol) port.
If the characteristics of the received message are matched with the message characteristics included in the preset ACL, the switch can identify the message as a protocol message and determine that the protocol type of the message is matched with the preset protocol type.
In one implementation, the matching item of the default ACL is a message characteristic, and the action item is a protocol message identified by an identifier. And the switch matches the characteristics of the received message with the matching items of the preset ACL. If the characteristics of the received message are matched with the matching items of the preset ACL, namely the characteristics of the received message are matched with the message characteristics included in the preset ACL, the switch marks the message as a protocol message according to the action items of the preset ACL, and further determines that the protocol type of the message is matched with the preset protocol type.
Logic representing the corresponding relation between the VXLAN instance and the broadcast domain is stored in a chip of the switch, and the logic in the chip does not occupy ACL resources. After determining that the protocol type of the received message is matched with the preset protocol type, the switch determines that the received message is a protocol message which is allowed to be broadcasted by the user. And the switch acquires a target broadcast domain corresponding to the VXLAN instance to which the received message belongs from the chip by combining the acquired VXLAN instance to which the received message belongs, and further broadcasts the message in the target broadcast domain.
If the characteristics of the received message are not matched with the message characteristics included in the preset ACL, the switch can determine that the protocol type of the message is not matched with the preset protocol type.
In an embodiment of the present application, if the protocol type of the received packet does not match the preset protocol type, the switch determines that the received packet is not a protocol packet that the user allows to perform broadcasting, and the destination address of the packet is a broadcasting address, and discards the packet.
The following describes an embodiment of the present application with reference to a flowchart shown in fig. 2. If the protocol 11 and the protocol 12 are broadcasting-enabled protocols, the switches are configured in advance with: an ACL11 including the message feature T1 of protocol 11 and an ACL12 including the message feature T2 of protocol 12. In addition, the chip of the switch stores the logic of the corresponding relationship between the VXLAN instance 11 and the broadcast domain 11.
Step 201, the switch receives the message M, extracts the destination MAC address 1 from the message M, and determines the VXLAN instance 11 to which the message M belongs.
In step 202, the switch determines whether the destination MAC address 1 is a broadcast address.
If it is a broadcast address, step 203 is performed. If not, step 207 is performed.
Step 203, the switch performs protocol analysis on the message M, and matches the features of the message M with the message features included in the ACL.
If the feature of the message M matches the message feature 11 included in the ACL11, the message M is identified as a protocol message, the message M is determined to be a message of a protocol allowed to be broadcasted, and step 204 is executed.
If the characteristics of the message M are not matched with the message characteristics included in ACL11 and ACL12, it is determined that the message M is not a message of a protocol that allows broadcasting, and step 206 is performed.
In step 204, the switch obtains the broadcast domain 11 corresponding to the VXLAN instance 11 from the logic of the chip.
In step 205, the switch broadcasts a message M in the broadcast domain 11.
In step 206, if the switch determines in step 203 that the characteristics of the message M are not matched with the message characteristics included in ACL11 and ACL12, the switch discards the message M.
In step 207, if the switch determines in step 202 that the destination MAC address 1 is not a broadcast address, the switch searches the MAC address table for a destination MAC address table entry 1 including the destination MAC address 1.
If the destination MAC address table entry 1 is not found, step 208 is executed. If the destination MAC address table entry 1 is found, step 203 is executed to perform protocol analysis on the message M.
In step 208, the switch unicasts the message M through the egress port 1 included in the destination MAC address table entry 1.
The invention concept same as the message processing method, and the embodiment of the application also provides a switch. Referring to fig. 3, fig. 3 is a schematic structural diagram of a switch according to an embodiment of the present application, and the switch includes:
a judging module 301, configured to judge whether a destination address of a received packet is a broadcast address;
the analysis module 302 is configured to determine whether the protocol type of the message matches the preset protocol type according to the message feature included in the preset ACL when the determination result of the determination module 301 is yes;
an obtaining module 303, configured to obtain, from a chip of the switch, a target broadcast domain corresponding to the VXLAN instance to which the message belongs when the parsing module 302 determines that the protocol type of the message matches the preset protocol type;
a broadcast module 304, configured to broadcast the message in the target broadcast domain.
In an embodiment of the present application, referring to the switch shown in fig. 4, based on fig. 3, the switch may further include:
a searching module 305, configured to search a destination address table entry including a destination address of the message from the address table entries when the determination result of the determining module 301 is negative; the address table entry comprises a corresponding relation between an address and an output port;
a unicast module 306, configured to unicast the packet through the egress port included in the destination address table entry when the lookup module 305 finds the destination address table entry.
In an embodiment of the present application, the parsing module 302 may be further configured to determine whether the protocol type of the packet matches a preset protocol type when the lookup module 305 does not find the destination address entry.
In an embodiment of the present application, the parsing module 302 may be specifically configured to:
matching the characteristics of the message with the message characteristics included in the preset ACL by using the TCAM; if the message is matched with the preset protocol type, identifying the message as a protocol message, and determining that the protocol type of the message is matched with the preset protocol type; and if not, determining that the protocol type of the message is not matched with the preset protocol type.
In an embodiment of the present application, the switch shown in fig. 4 may further include:
a discarding module 307, configured to discard the packet when the parsing module 302 determines that the protocol type of the packet does not match the preset protocol type.
In the embodiment of the application, when broadcasting of the VXLAN is realized, only one ACL including the message characteristics of the protocol needs to be configured for each protocol, and one ACL does not need to be configured for each protocol under each VXLAN instance, so that the use amount of the ACL is reduced, and the distribution and use influence on other service table entries is reduced while the negative influence caused by closing the broadcasting function of the VXLAN is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. Especially, for the switch embodiment, since it is basically similar to the message processing method embodiment, the description is relatively simple, and relevant points can be referred to the partial description of the message processing method embodiment.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (8)

1. A message processing method is applied to a switch, and the method comprises the following steps:
judging whether the destination address of the received message is a broadcast address or not;
if the address is a broadcast address, determining whether the protocol type of the message is matched with a preset protocol type according to message characteristics included in a preset Access Control List (ACL);
if the message is matched with the target broadcast domain, acquiring a target broadcast domain corresponding to the VXLAN instance of the extensible virtual local area network to which the message belongs from a chip of the switch;
broadcasting the message in the target broadcast domain;
the step of determining whether the protocol type of the message is matched with a preset protocol type according to the message characteristics included in the preset ACL includes:
matching the characteristics of the message with the message characteristics included in a preset ACL by using a Ternary Content Addressable Memory (TCAM);
if so, identifying the message as a protocol message, and determining that the protocol type of the message is matched with a preset protocol type;
and if not, determining that the protocol type of the message is not matched with a preset protocol type.
2. The method of claim 1, further comprising:
if the destination address of the message is judged not to be the broadcast address, searching a destination address table item comprising the destination address of the message from an address table; each address table entry in the address table comprises a corresponding relation between an address and an output port;
if the destination address table entry is found, unicasting the message through an output port included in the destination address table entry.
3. The method of claim 2, further comprising:
and if the destination address table entry is not found, determining whether the protocol type of the message is matched with a preset protocol type.
4. The method of claim 1, further comprising:
and if the protocol type of the message is determined not to be matched with the preset protocol type, discarding the message.
5. A switch, comprising:
the judging module is used for judging whether the destination address of the received message is a broadcast address or not;
the analysis module is used for determining whether the protocol type of the message is matched with a preset protocol type according to the message characteristics included in a preset Access Control List (ACL) when the judgment result of the judgment module is yes;
the acquisition module is used for acquiring a target broadcast domain corresponding to the extensible virtual local area network VXLAN instance to which the message belongs from a chip of the switch when the analysis module determines that the protocol type of the message is matched with a preset protocol type;
a broadcasting module, configured to broadcast the packet in the target broadcast domain;
the analysis module is specifically configured to: matching the characteristics of the message with the message characteristics included in a preset ACL by using a Ternary Content Addressable Memory (TCAM); if so, identifying the message as a protocol message, and determining that the protocol type of the message is matched with a preset protocol type; and if not, determining that the protocol type of the message is not matched with a preset protocol type.
6. The switch of claim 5, further comprising:
the searching module is used for searching a destination address table item comprising the destination address of the message from the address table items when the judgment result of the judging module is negative; the address table entry comprises a corresponding relation between an address and an output port;
and the unicast module is used for unicasting the message through an output port included in the destination address table item when the search module searches the destination address table item.
7. The switch according to claim 6, wherein the parsing module is further configured to determine whether the protocol type of the packet matches a preset protocol type when the destination address table entry is not found by the searching module.
8. The switch of claim 5, further comprising:
and the discarding module is used for discarding the message when the analysis module determines that the protocol type of the message is not matched with the preset protocol type.
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