CN106506378B - The update method and device of mac address table - Google Patents
The update method and device of mac address table Download PDFInfo
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- CN106506378B CN106506378B CN201611040200.5A CN201611040200A CN106506378B CN 106506378 B CN106506378 B CN 106506378B CN 201611040200 A CN201611040200 A CN 201611040200A CN 106506378 B CN106506378 B CN 106506378B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/021—Ensuring consistency of routing table updates, e.g. by using epoch numbers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The application provides the update method and device of a kind of mac address table, is applied to the network equipment, comprising: when this equipment is edge device, if it is determined that network topological change does not remove the machine mac address table then；Based on the IP address and MAC Address of the stored terminal device being connected with edge port, gratuitous ARP packet is constructed；The gratuitous ARP packet is sent by non-edge ports；When receiving the gratuitous ARP packet of other edge devices transmission, the mac address table is updated based on the gratuitous ARP packet.Technical scheme can interrupt to avoid the forwarding for occurring the long period between host each in network, optimize the forwarding performance of the network equipment.
Description
Technical field
This application involves the update methods and device of field of communication technology more particularly to a kind of mac address table.
Background technique
With the development of information technology, the forwarding performance of the network equipment is required higher and higher.In two layers of large-scale forwarding
In network, data link layer in local area network can be eliminated based on STP (Spanning Tree Protocol, Spanning-Tree Protocol)
Physics loop.When there are multiple VLAN (Virtual Local Area Network, virtual local areas in this two layers forwarding network
Net) when, then different VLAN can be made based on MSTP (Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol)
Message forwarded according to respective path.In same VLAN, when certain network equipment detects network topological change, Ke Yitong
BPDU (Bridge Protocol Data Unit, bridge protocol data unit) is crossed to other network equipments notice network topology
Change.Each network equipment can remove stored mac address table, again to mac address table after determining network topological change
Learnt, this may will lead to the forwarding for occurring the long period in network between each host and interrupt, and affect the network equipment
Forwarding performance.
Summary of the invention
In view of this, the application provides the update method and device of a kind of mac address table, to solve to occur in the related technology
The problem of forwarding of long period is interrupted.
Specifically, the application is achieved by the following technical solution:
In a first aspect, the application provides a kind of update method of mac address table, the method is applied to the network equipment, packet
It includes:
When this equipment is edge device, if it is determined that network topological change does not remove the machine mac address table then；
Based on the IP address and MAC Address of the stored terminal device being connected with edge port, gratuitous ARP report is constructed
Text；
The gratuitous ARP packet is sent by non-edge ports；
When receiving the gratuitous ARP packet of other edge devices transmission, based on described in gratuitous ARP packet update
Mac address table.
Second aspect, the application provide a kind of updating device of mac address table, and described device is applied to the network equipment, packet
It includes:
List item stick unit, for when this equipment is edge device, if it is determined that network topological change does not remove this then
Machine mac address table；
Message structural unit, for IP address and MAC based on the stored terminal device being connected with edge port
Location constructs gratuitous ARP packet；
Packet sending unit, for sending the gratuitous ARP packet by non-edge ports；
List item updating unit, it is described free for being based on when receiving the gratuitous ARP packet of other edge devices transmission
ARP message updates the mac address table.
Analyze above-mentioned technical proposal it is found that the network equipment the machine MAC when determining network topological change, can not be removed
Location table.Edge device in the network equipment can IP address and MAC Address based on the terminal device being connected with edge port, structure
It makes gratuitous ARP packet and sends.Compared with the relevant technologies, when the forward-path between two hosts is not by network topological change shadow
When ringing, each network equipment in the forward-path can still be carried out between the two hosts based on stored mac address table
Message forwarding is interrupted to avoid the occurrence of unnecessary forwarding, guarantees the forwarding performance of the network equipment.And when between two hosts
Forward-path when being influenced by network topological change, each network equipment in the forward-path can be free based on what is received
ARP message is in time updated the machine mac address table, so that forwarding the message between the two hosts can be quickly extensive
It is multiple, optimize the forwarding performance of the network equipment.
Detailed description of the invention
Fig. 1 is a kind of group-network construction figure of two layers of forwarding network；
Fig. 2 is a kind of flow chart of the update method of mac address table shown in one exemplary embodiment of the application；
Fig. 3 is the hardware of equipment where a kind of updating device of mac address table shown in one exemplary embodiment of the application
Structure chart；
Fig. 4 is a kind of block diagram of the updating device of mac address table shown in one exemplary embodiment of the application.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the application.
It is only to be not intended to be limiting the application merely for for the purpose of describing particular embodiments in term used in this application.
It is also intended in the application and the "an" of singular used in the attached claims, " described " and "the" including majority
Form, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein refers to and wraps
It may be combined containing one or more associated any or all of project listed.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example, not departing from
In the case where the application range, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination ".
Referring to FIG. 1, for a kind of group-network construction figure of two layers of forwarding network.Wherein, all terminal device and interchanger
Same VLAN is added.In the VLAN, it is based on MSTP, interchanger 1 can be with port blocked with port blocked 12, interchanger 2
22, so that the link between interchanger 1 and interchanger 2 be made to disconnect, avoid the generation of physics loop.When interchanger 1 and interchanger 4
Between link failure when, port 12 and port 22 can enter forwarding state, to make between interchanger 1 and interchanger 2
Link-recovery works normally.Interchanger 4 can detect network topological change based on port 41, and send topology by port 42
Change and notice, interchanger 1 can detect network topological change based on port 13, and send topological change by port 12 and lead to
It accuses.In the related technology, interchanger 3 determines network topological change when receiving topology change notice, can remove in the machine and be somebody's turn to do
Then the corresponding all list items of the corresponding all list items of the corresponding mac address table middle port 32 of VLAN and port 33 carry out weight
New study is to instruct subsequent message to forward.In these cases, the forward-path between terminal device 2 and terminal device 3 is simultaneously
It is not affected by influence, interchanger 3 is original can still to E-Packet by port 32 for terminal device 2 and terminal device 3, but list item
A period of time is generally required after removing can just relearn recovery, this will lead to need not between terminal device 2 and terminal device 3
The forwarding wanted is interrupted.
It is a kind of flow chart of the update method of mac address table shown in one exemplary embodiment of the application with reference to Fig. 2,
This method can be applied to the network equipment, comprising the following steps:
Step 201: when this equipment is edge device, if it is determined that network topological change does not remove the machine MAC Address then
Table.
In the present embodiment, the port of the network equipment can be divided into edge port and non-edge ports, wherein edge port
For the port being directly attached with terminal device, the network equipment with edge port is edge device, does not have marginal end
The network equipment of mouth is the non-edge network equipment.When this equipment is edge device, if it is determined that network topological change, then it can be with
The machine mac address table is not removed.
Step 202: IP address and MAC Address based on the stored terminal device being connected with edge port, construction are exempted from
Take ARP message.
It in the present embodiment, can be based on stored and its edge if edge device determines network topological change
The IP address and MAC Address of the connected terminal device in port, construct gratuitous ARP packet.
In an alternative embodiment, edge device can monitor ARP message or IP packet from terminal device, and
Learn the IP address and MAC Address of the terminal device according to the ARP message or the IP packet.In general, each network equipment
It may learn the IP address and MAC Address of all terminal devices in networking, and edge device is when constructing gratuitous ARP packet,
Can IP address and MAC Address based on the terminal device being connected with its edge port, construct gratuitous ARP packet, the gratuitous ARP report
The source IP address and purpose IP address of text are the IP address of the terminal device, and source MAC is the MAC of the terminal device
Location, target MAC (Media Access Control) address are broadcast address, so that in network topology change, other network equipments can be with Fast Learning to correspondence
The forwarding-table item of terminal device.
Step 203: the gratuitous ARP packet is sent by non-edge ports.
In the present embodiment, edge device can send the gratuitous ARP packet of construction by its non-edge ports.
Step 204: when receiving the gratuitous ARP packet of other edge devices transmission, more based on the gratuitous ARP packet
The new mac address table.
It in the present embodiment, can basis when edge device receives the gratuitous ARP packet of other edge devices transmission
Source IP address or purpose IP address, the source MAC and inbound port of the gratuitous ARP packet update the machine mac address table.
In an alternative embodiment, when this equipment is non-edge equipment, if it is determined that network topological change, it can also
Not remove the machine mac address table.And when non-edge equipment receives the gratuitous ARP packet from edge device, Ke Yigen
According to source IP address or purpose IP address, the source MAC and inbound port of the gratuitous ARP packet, the machine MAC Address is updated
Table.
In another alternative embodiment, each network equipment can be based on Port detecting to network topological change, or
Network topological change is determined when receiving topology and changing notice.
It should be noted that when multiple VLAN are added in the network equipment, it, can if the network topological change of a certain VLAN
Not remove mac address table corresponding with the VLAN in the machine.Edge device in the network equipment can also construct gratuitous ARP report
Text, the gratuitous ARP packet is that the IP address and MAC Address based on the terminal device being connected with edge port construct, described to exempt from
The VLAN ID of the VLAN is carried in expense ARP message.Edge device can be sent by the non-edge ports bound with the VLAN
The gratuitous ARP packet.The network equipment can be updated when receiving gratuitous ARP packet according to the VLAN ID wherein carried
Mac address table corresponding with the VLAN in the machine.
In addition, the network equipment can also be based on the gratuitous ARP packet received more when in arp cache table including port
New the machine arp cache table.Port in the arp cache table is generally not used for forwarding, and is used to manage arp cache table, such as: it is right
Each list item in arp cache table is ranked up, or is searched etc. when searching arp cache list item using interface as index.
Based on group-network construction figure shown in FIG. 1, the update method of above-mentioned mac address table is described in detail.
Referring to FIG. 1, interchanger 1 is connected by port 11 with terminal device 1, interchanger 2 is set by port 21 with terminal
Standby 2 are connected, and interchanger 3 is connected by port 31 with terminal device 3, and port 11, port 21 and port 31 are edge port, hand over
Change planes 1 to interchanger 3 be edge device.The port 41 and port 42 of interchanger 4 are not connect with terminal device directly, exchange
Machine 4 is non-edge equipment.
It is assumed that VLAN 1 is added in interchanger 1 to interchanger 4, all of the port shown in Fig. 1 is also tied up with VLAN 1
Fixed, interchanger 1 is additionally added VLAN 2, and port 11 is also bundled with VLAN 2.In VLAN 1, it is based on MSTP, interchanger 1 can hinder
Port 12 is filled in, interchanger 2, so that the link between interchanger 1 and interchanger 2 be made to disconnect, can avoid physics with port blocked 22
The generation of loop.When the link between interchanger 1 and interchanger 4 disconnects, port 12 and port 22 can enter forwarding state,
To make the link-recovery between interchanger 1 and interchanger 2 work normally.Interchanger 4 can detect VLAN based on port 41
1 network topological change, and topology is sent by port 42 and changes notice, interchanger 1 can detect VLAN based on port 13
1 network topological change, and topology is sent by port 12 and changes notice.Interchanger 2 and interchanger 3 are receiving topological change
When notice, the network topological change of VLAN 1 can be determined.
Each interchanger can not be removed corresponding with VLAN 1 in the machine when determining the network topological change of VLAN 1
Mac address table.Each edge device can IP address and MAC Address based on the terminal device being connected with its edge port, construction
Gratuitous ARP packet and the non-edge ports by belonging to VLAN 1 are sent, and the VLAN ID carried in the gratuitous ARP packet is 1.
Each interchanger can update this according to the VLAN ID wherein carried when receiving the gratuitous ARP packet from other equipment
Mac address table corresponding with VLAN 1 in machine.
For example, the forward-path between terminal device 2 and terminal device 3 is not by network topological change in VLAN 1
It influences, since interchanger 3 does not remove all list items corresponding with VLAN 1 and port 32 in the machine mac address table, hands over
Changing planes 3 can be still that terminal device 2 and terminal device 3 E-Packet by port 32, avoid terminal device 2 and terminal device 3
Between unnecessary forwarding interrupt, guarantee the forwarding performance of interchanger 3.
For another example, in VLAN 1, the forward-path between terminal device 1 and terminal device 2 is influenced by network topological change,
Original interchanger 1 can be E-Packeted by port 13 for terminal device 1 and terminal device 2, but in the network topology of VLAN 1
After change, interchanger 1 needs to be that terminal device 1 and terminal device 2 E-Packet by port 12.Interchanger 2 is determining VLAN
When 1 network topological change, can IP address and MAC Address based on terminal device 2, construction gratuitous ARP packet simultaneously pass through end
Mouth 22 and port 23 are sent.The source IP address and purpose IP address of the gratuitous ARP packet are the IP address of terminal device 2, source
MAC Address is the MAC Address of terminal device 2, and target MAC (Media Access Control) address is broadcast address, and the VLAN ID of carrying is 1.Interchanger 1 can
To receive the gratuitous ARP packet by port 12, and updated based on the gratuitous ARP packet corresponding with VLAN 1 in the machine
Port 13 corresponding with terminal device 2 and VLAN 1 in forwarding-table item can be updated to hold by mac address table, specifically, interchanger 1
Mouth 12.Thus interchanger 1 can learn the forwarding-table item to counterpart terminal equipment 2 in time, and subsequent can be eventually by port 12
End equipment 1 and terminal device 2 E-Packet, so that the message between terminal device 1 and terminal device 2 is made to forward fast quick-recovery,
The forwarding performance of optimal change machine 1.In the whole process, since the network topology of VLAN 2 does not change, interchanger 1
When receiving above-mentioned gratuitous ARP packet, without updating forwarding-table item relevant to VLAN 2 according to the gratuitous ARP packet.
As seen from the above-described embodiment, the network equipment can not remove the machine MAC Address when determining network topological change
Table.Edge device in the network equipment can IP address and MAC Address based on the terminal device being connected with edge port, construction
Gratuitous ARP packet is simultaneously sent.Compared with the relevant technologies, when the forward-path between two hosts is not influenced by network topological change
When, each network equipment in the forward-path can still carry out the report between the two hosts based on stored mac address table
Text forwarding is interrupted to avoid the occurrence of unnecessary forwarding, guarantees the forwarding performance of the network equipment.And when between two hosts
When forward-path is influenced by network topological change, each network equipment in the forward-path can be based on the gratuitous ARP received
Message is in time updated the machine mac address table, thus make message between the two hosts forward can fast quick-recovery, it is excellent
Change the forwarding performance of the network equipment.
Corresponding with the embodiment of the update method of aforementioned mac address table, present invention also provides the updates of mac address table
The embodiment of device.
The embodiment of the updating device of the application mac address table can be using on network devices.Installation practice can be with
By software realization, can also be realized by way of hardware or software and hardware combining.Taking software implementation as an example, it is patrolled as one
Device in volume meaning is by the processor of the network equipment where it by computer program corresponding in nonvolatile memory
Instruction is read into memory what operation was formed.For hardware view, as shown in figure 3, being the more new clothes of the application mac address table
A kind of hardware structure diagram of the network equipment where setting, in addition to processor shown in Fig. 3, memory, network interface and non-volatile
Except memory, the network equipment in embodiment where device may be used also generally according to the actual functional capability of the update of the mac address table
To include other hardware, this is repeated no more.
Referring to FIG. 4, the block diagram of the updating device for a kind of mac address table shown in one exemplary embodiment of the application,
The device 400 can be applied to the network equipment shown in Fig. 3, comprising:
List item stick unit 401, for when this equipment is edge device, if it is determined that network topological change, then it is unclear
Except the machine mac address table；
Message structural unit 402, for IP address and MAC based on the stored terminal device being connected with edge port
Address constructs gratuitous ARP packet；
Packet sending unit 403, for sending the gratuitous ARP packet by non-edge ports；
List item updating unit 404, for being based on described when receiving the gratuitous ARP packet of other edge devices transmission
Gratuitous ARP packet updates the mac address table.
In an alternative embodiment, the list item stick unit 401 can be also used for setting when this equipment for non-edge
When standby, if it is determined that network topological change does not remove the machine mac address table then；The list item updating unit 404 can be also used for
When receiving the gratuitous ARP packet from edge device, the mac address table is updated based on the gratuitous ARP packet.
In another alternative embodiment, described device 400 can also include:
Address learning unit 405, for when receiving ARP message or the IP packet from terminal device, according to described
ARP message or the IP packet learn the IP address and MAC Address of the terminal device.
In another alternative embodiment, the determining network topological change may include:
This equipment is based on Port detecting to network topological change；Or this equipment receives topology and changes notice.
In another alternative embodiment, the list item stick unit 401 can be also used for when the addition of this equipment is multiple
When VLAN, the machine mac address table of not removing is not remove MAC Address corresponding with the VLAN of network topological change in the machine
Table；The VLAN ID of the VLAN of the network topological change is carried in the gratuitous ARP packet.
The function of each unit and the realization process of effect are specifically detailed in the above method and correspond to step in above-mentioned apparatus
Realization process, details are not described herein.
For device embodiment, since it corresponds essentially to embodiment of the method, so related place is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
The purpose for needing to select some or all of the modules therein to realize application scheme.Those of ordinary skill in the art are not paying
Out in the case where creative work, it can understand and implement.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (10)
1. a kind of update method of mac address table, the method is applied to the network equipment, which is characterized in that the described method includes:
When this equipment is edge device, if it is determined that network topological change does not remove the machine mac address table then；
Based on the IP address and MAC Address of the stored terminal device being connected with edge port, gratuitous ARP packet is constructed；
The gratuitous ARP packet is sent by non-edge ports；
When receiving the gratuitous ARP packet of other edge devices transmission, with updating the MAC based on the gratuitous ARP packet
Location table.
2. the method according to claim 1, wherein the method also includes:
When this equipment is non-edge equipment, if it is determined that network topological change does not remove the machine mac address table then；
When receiving the gratuitous ARP packet from edge device, the mac address table is updated based on the gratuitous ARP packet.
3. the method according to claim 1, wherein the method also includes:
When receiving ARP message or the IP packet from terminal device, institute is learnt according to the ARP message or the IP packet
State the IP address and MAC Address of terminal device.
4. the method according to claim 1, wherein the determining network topological change includes:
This equipment is based on Port detecting to network topological change；Or this equipment receives topology and changes notice.
5. the method according to claim 1, wherein the method also includes:
When multiple VLAN are added in this equipment, the machine mac address table of not removing is not remove in the machine to change with network topology
The corresponding mac address table of the VLAN of change；The VLAN ID of the VLAN of the network topological change is carried in the gratuitous ARP packet.
6. a kind of updating device of mac address table, described device is applied to the network equipment, which is characterized in that described device includes:
List item stick unit, for when this equipment is edge device, if it is determined that network topological change does not remove the machine then
Mac address table；
Message structural unit, for IP address and MAC Address based on the stored terminal device being connected with edge port, structure
Make gratuitous ARP packet；
Packet sending unit, for sending the gratuitous ARP packet by non-edge ports；
List item updating unit, for being based on the gratuitous ARP when receiving the gratuitous ARP packet of other edge devices transmission
Message updates the mac address table.
7. device according to claim 6, which is characterized in that
The list item stick unit is also used to when this equipment is non-edge equipment, if it is determined that network topological change, then it is unclear
Except the machine mac address table；
The list item updating unit is also used to when receiving the gratuitous ARP packet from edge device, is based on the gratuitous ARP
Message updates the mac address table.
8. device according to claim 6, which is characterized in that described device further include:
Address learning unit, for when receiving ARP message or the IP packet from terminal device, according to the ARP message
Or the IP packet learns the IP address and MAC Address of the terminal device.
9. device according to claim 6, which is characterized in that the determining network topological change includes:
This equipment is based on Port detecting to network topological change；Or this equipment receives topology and changes notice.
10. device according to claim 6, which is characterized in that
The list item stick unit is also used to when multiple VLAN are added in this equipment, and the machine mac address table of not removing is not
Remove mac address table corresponding with the VLAN of network topological change in the machine；The network is carried in the gratuitous ARP packet to open up
Flutter the VLAN ID of the VLAN of change.
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| CN111245700B (en) * | 2020-01-16 | 2022-02-22 | 新华三信息安全技术有限公司 | Loop detection method and device |
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| CN102143068A (en) * | 2011-03-01 | 2011-08-03 | 华为技术有限公司 | Method, device and system for learning MAC (Media Access Control) address |
| CN105591936A (en) * | 2015-09-11 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device for updating forwarding table item |
| CN105792174A (en) * | 2014-12-26 | 2016-07-20 | 华为技术有限公司 | Wireless local area network roaming method, access point and wireless controller |
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| US7697527B2 (en) * | 2003-07-30 | 2010-04-13 | Nortel Networks Limited | Method and apparatus for direct frame switching using frame contained destination information |
| SG10201505168TA (en) * | 2010-06-29 | 2015-09-29 | Huawei Tech Co Ltd | Asymmetric network address encapsulation |
| CN103118148B (en) * | 2013-01-31 | 2016-06-08 | 杭州华三通信技术有限公司 | A kind of ARP buffering updating method and equipment |
| CN104378297B (en) * | 2013-08-15 | 2018-01-16 | 新华三技术有限公司 | A kind of message forwarding method and equipment |
| CN105591798B (en) * | 2015-07-24 | 2019-04-09 | 新华三技术有限公司 | The method, apparatus of OAM Information is transmitted in DCN |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143068A (en) * | 2011-03-01 | 2011-08-03 | 华为技术有限公司 | Method, device and system for learning MAC (Media Access Control) address |
| CN105792174A (en) * | 2014-12-26 | 2016-07-20 | 华为技术有限公司 | Wireless local area network roaming method, access point and wireless controller |
| CN105591936A (en) * | 2015-09-11 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device for updating forwarding table item |
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