CN106506378A - The update method of mac address table and device - Google Patents
The update method of mac address table and device Download PDFInfo
- Publication number
- CN106506378A CN106506378A CN201611040200.5A CN201611040200A CN106506378A CN 106506378 A CN106506378 A CN 106506378A CN 201611040200 A CN201611040200 A CN 201611040200A CN 106506378 A CN106506378 A CN 106506378A
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- mac address
- edge
- equipment
- gratuitous arp
- address table
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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
-
- 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
Abstract
The application provides a kind of update method of mac address table and device, is applied to the network equipment, including：When this equipment is edge device, if it is determined that network topological change, then the machine mac address table is not removed；IP address and MAC Address based on the terminal device being connected with edge port for having stored, constructs gratuitous ARP packet；The gratuitous ARP packet is sent by non-edge ports；When the gratuitous ARP packet that other edge devices send is received, the mac address table is updated based on the gratuitous ARP packet.Technical scheme can avoid the forwarding for occurring the long period in network between each main frame from interrupting, and optimize the forwarding performance of the network equipment.
Description
Technical field
The application is related to communication technical field, more particularly to a kind of update method of mac address table and device.
Background technology
With the development of information technology, more and more higher is required to the forwarding performance of the network equipment.In two layers of large-scale forwarding
In network, STP (Spanning Tree Protocol, Spanning-Tree Protocol) can be based on and eliminate data link layer in LAN
Physics loop.When this two layers forward network in there is multiple VLAN (Virtual Local Area Network, virtual local area
Net) when, then different VLAN can be made based on MSTP (Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol)
Message forward 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 equipment notice network topologies
Change.Each network equipment can remove the mac address table for having stored, again to mac address table after network topological change is determined
Learnt, this may cause the forwarding for occurring the long period in network between each main frame to be interrupted, and have impact on the network equipment
Forwarding performance.
Content of the invention
In view of this, the application provides a kind of update method of mac address table and device, to solve to occur in correlation technique
The problem that the 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, methods described is applied to the network equipment, wraps
Include：
When this equipment is edge device, if it is determined that network topological change, then the machine mac address table is not removed；
IP address and MAC Address based on the terminal device being connected with edge port for having stored, constructs gratuitous ARP report
Text；
The gratuitous ARP packet is sent by non-edge ports；
When the gratuitous ARP packet that other edge devices send is received, updated based on the gratuitous ARP packet described
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, wrap
Include：
List item stick unit, for when this equipment is edge device, if it is determined that network topological change, does not then remove this
Machine mac address table；
Message structural unit, for the IP address based on the terminal device being connected with edge port for having stored and MAC ground
Location, constructs gratuitous ARP packet；
Packet sending unit, for sending the gratuitous ARP packet by non-edge ports；
Entry updating unit, for when the gratuitous ARP packet that other edge devices send is received, based on described free
ARP messages update the mac address table.
Analysis above-mentioned technical proposal understands that the network equipment can not remove the machine MAC ground when network topological change is determined
Location table.Edge device in the network equipment can be based on the IP address of the terminal device being connected with edge port and MAC Address, structure
Make gratuitous ARP packet and send.Compared with correlation technique, when the forward-path between two main frames does not receive network topological change shadow
When ringing, each network equipment in the forward-path still can be carried out between the two main frames based on the mac address table for having stored
Message is forwarded, and is interrupted so as to avoid the occurrence of unnecessary forwarding, it is ensured that the forwarding performance of the network equipment.And when between two main frames
Forward-path when being affected by network topological change, each network equipment in the forward-path can be free based on received
ARP messages are updated to the machine mac address table in time, so that the message forwarding between the two main frames can be quickly extensive
Multiple, optimize the forwarding performance of the network equipment.
Description of the drawings
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 the mac address table shown in one exemplary embodiment of the application；
Fig. 3 is a kind of hardware of the updating device place equipment of the 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 the mac address table shown in one exemplary embodiment of the application.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.Conversely, they be only with as appended by
The example of consistent apparatus and method in terms of some that described in detail in claims, the application.
It is the purpose only merely for description specific embodiment in term used in this application, and is not intended to be limiting the application.
" one kind ", " described " and " being somebody's turn to do " of singulative used in the application and appended claims is also intended to include majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein is referred to and is wrapped
Containing one or more associated any or all possible combination for listing project.
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 for same type of information is distinguished from each other out.For example, without departing from
In the case of the application scope, 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.Depend on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining ".
Fig. 1 is refer to, is a kind of group-network construction figure of two layers of forwarding network.Wherein, all of terminal device and switch
Same VLAN is added.In the VLAN, based on MSTP, switch 1 can be with port blocked with port blocked 12, switch 2
22, so that the link between switch 1 and switch 2 disconnects, it is to avoid the generation of physics loop.When switch 1 and switch 4
Between link failure when, port 12 and port 22 can enter forwarding state, so that between switch 1 and switch 2
Link-recovery normal work.Switch 4 can detect network topological change based on port 41, and send topology by port 42
Change notice, switch 1 can detect network topological change based on port 13, and it is logical topology change to be sent by port 12
Accuse.In correlation technique, switch 3 determines network topological change when topology change notice is received, and can remove in the machine and be somebody's turn to do
The corresponding all list items of the corresponding all list items of the corresponding mac address table middle ports 32 of VLAN and port 33, then carry out weight
Newly learn to instruct follow-up message to forward.In these cases, the forward-path between terminal device 2 and terminal device 3 is simultaneously
It is not affected by affecting, it can be still that terminal device 2 and terminal device 3 E-Packet by port 32 that switch 3 is original, but list item
Generally require just to relearn recovery for a period of time after removing, this may result in need not between terminal device 2 and terminal device 3
The forwarding that wants is interrupted.
With reference to Fig. 2, it is a kind of flow chart of the update method of mac address table shown in one exemplary embodiment of the application,
The method can apply to the network equipment, comprise the following steps：
Step 201：When this equipment is edge device, if it is determined that network topological change, then the machine MAC Address is not removed
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, and not there is 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 can be with
The machine mac address table is not removed.
Step 202：IP address and MAC Address based on the terminal device being connected with edge port for having stored, construction are exempted from
Take ARP messages.
In the present embodiment, if edge device determines network topological change, can be based on having stored and its edge
The IP address of the terminal device that port is connected and MAC Address, construct gratuitous ARP packet.
In an optional embodiment, edge device can monitor the ARP messages or IP messages from terminal device, and
According to IP address and MAC Address that the ARP messages or the IP messages learn the terminal device.Generally, each network equipment
May learn the IP address of all terminal devices and MAC Address in networking, and edge device be when gratuitous ARP packet is constructed,
Gratuitous ARP packet, the gratuitous ARP report can be constructed based on the IP address of the terminal device being connected with its edge port and MAC Address
The source IP address and purpose IP address of text is the IP address of the terminal device, and source MAC is the MAC ground 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 correspondingly
The forwarding-table item of terminal device.
Step 203：The gratuitous ARP packet is sent by non-edge ports.
In the present embodiment, the gratuitous ARP packet of construction can be transmitted by edge device by its non-edge ports.
Step 204：When the gratuitous ARP packet that other edge devices send is received, based on the gratuitous ARP packet more
The new mac address table.
In the present embodiment, when edge device receives the gratuitous ARP packet that other edge devices send, can basis
The source IP address of the gratuitous ARP packet or purpose IP address, source MAC and inbound port, update the machine mac address table.
In an optional embodiment, when this equipment is non-edge equipment, if it is determined that network topological change, also may be used
Not remove the machine mac address table.And when non-edge equipment is received from the gratuitous ARP packet of edge device, can be with root
According to the source IP address or purpose IP address, source MAC and inbound port of the gratuitous ARP packet, the machine MAC Address is updated
Table.
In another optional embodiment, each network equipment can be based on Port detecting to network topological change, or
Network topological change is determined receiving when topology changes notice.
It should be noted that when the network equipment adds multiple VLAN, if the network topological change of a certain VLAN, can
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 are the IP address based on the terminal device being connected with edge port and MAC Address construction, described exempt from
The VLAN ID of the VLAN are carried in expense ARP messages.Edge device can be sent out by the non-edge ports that is bound with the VLAN
Send the gratuitous ARP packet.The network equipment, can be according to the VLAN ID for wherein carrying, more when gratuitous ARP packet is received
Mac address table corresponding with the VLAN in new the machine.
In addition, when port is included in arp cache table, the network equipment can also be based on the gratuitous ARP packet for receiving more
New the machine arp cache table.Port in the arp cache table is generally not used for forwarding, and is used for managing arp cache table, for example：Right
Each list item in arp cache table is ranked up, or makes a look up interface as index when arp cache list item is searched.
Based on the group-network construction figure shown in Fig. 1, the update method of above-mentioned mac address table is described in detail.
Fig. 1 is refer to, switch 1 is connected with terminal device 1 by port 11, and switch 2 is set by port 21 and terminal
Standby 2 are connected, and switch 3 is connected with terminal device 3 by port 31, and port 11, port 21 and port 31 are edge port, hand over
1 to switch 3 of changing planes is edge device.The port 41 and port 42 of switch 4 is not directly connected with terminal device, is exchanged
Machine 4 is non-edge equipment.
It is assumed that switch 1 to switch 4 adds VLAN 1, all of the port illustrated in Fig. 1 also to tie up with VLAN 1
Fixed, switch 1 is additionally added VLAN 2, and VLAN 2 has also been bound in port 11.In VLAN1, based on MSTP, switch 1 can hinder
Plug port 12, switch 2 can be with port blockeds 22, so that the link between switch 1 and switch 2 disconnects, it is to avoid physics
The generation of loop.When the link between switch 1 and switch 4 disconnects, port 12 and port 22 can enter forwarding state,
So that the link-recovery normal work between switch 1 and switch 2.Switch 4 can detect VLAN based on port 41
1 network topological change, and topology change notice is sent by port 42, switch 1 can detect VLAN based on port 13
1 network topological change, and topology change notice is sent by port 12.Switch 2 and switch 3 are receiving topological change
During notice, it may be determined that the network topological change of VLAN 1.
Each switch can not be removed corresponding with VLAN 1 in the machine when the network topological change of VLAN 1 is determined
Mac address table.Each edge device can be constructed based on the IP address of the terminal device being connected with its edge port and MAC Address
Gratuitous ARP packet is simultaneously sent by the non-edge ports for belonging to VLAN 1, and the VLAN ID carried in the gratuitous ARP packet are 1.
Each switch can update this according to the VLAN ID for wherein carrying when receiving from the gratuitous ARP packet of other equipment
With 1 corresponding mac address tables of VLAN in machine.
For example, in VLAN 1, the forward-path between terminal device 2 and terminal device 3 does not receive network topological change
Affect, as switch 3 does not remove all list items corresponding with VLAN 1 and port 32 in the machine mac address table, therefore hand over
Change planes 3 can be still that terminal device 2 and terminal device 3 E-Packet by port 32, it is to avoid terminal device 2 and terminal device 3
Between unnecessary forwarding interrupt, it is ensured that the forwarding performance of switch 3.
For another example, in VLAN 1, the forward-path between terminal device 1 and terminal device 2 is affected by network topological change,
Original switch 1 can be that terminal device 1 and terminal device 2 E-Packet by port 13, but the network topology in VLAN 1
After change, it is that terminal device 1 and terminal device 2 E-Packet that switch 1 is needed by port 12.Switch 2 is determining VLAN
During 1 network topological change, gratuitous ARP packet can be constructed and by end based on the IP address of terminal device 2 and MAC Address
Mouth 22 and port 23 send.The source IP address of the gratuitous ARP packet and purpose IP address are the IP address of terminal device 2, source
MAC Address of the MAC Address for terminal device 2, target MAC (Media Access Control) address are broadcast address, and the VLAN ID of carrying are 1.Switch 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
Mac address table, specifically, switch 1 will can be updated to hold with terminal device 2 and 1 corresponding ports 13 of VLAN in forwarding-table item
Mouth 12.Thus switch 1 can learn the forwarding-table item to counterpart terminal equipment 2 in time, can subsequently pass through port 12 for eventually
End equipment 1 and terminal device 2 E-Packet, so that the message between terminal device 1 and terminal device 2 forwards fast quick-recovery,
The forwarding performance of optimal change machine 1.In whole process, as the network topology of VLAN 2 does not change, therefore switch 1
When above-mentioned gratuitous ARP packet is received, without the need for updating the forwarding-table item related 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 network topological change is determined
Table.Edge device in the network equipment can be constructed based on the IP address of the terminal device being connected with edge port and MAC Address
Gratuitous ARP packet simultaneously sends.Compared with correlation technique, when the forward-path between two main frames is not affected by network topological change
When, each network equipment in the forward-path still can carry out the report between the two main frames based on the mac address table for having stored
Text is forwarded, and is interrupted so as to avoid the occurrence of unnecessary forwarding, it is ensured that the forwarding performance of the network equipment.And when between two main frames
When forward-path is affected by network topological change, each network equipment in the forward-path can be based on the gratuitous ARP for receiving
Message is updated to the machine mac address table in time so that message between the two main frames forward can quick-recovery soon, 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 renewal of mac address table
The embodiment of device.
The embodiment of the updating device of the application mac address table can be applied on network devices.Device embodiment can be with
Realized by software, it is also possible to realized by way of hardware or software and hardware combining.As a example by implemented in software, patrol as one
Device in volume meaning, is by corresponding computer program in nonvolatile memory by the processor of its place network equipment
Instruction reads what operation in internal memory was formed.From for hardware view, as shown in figure 3, the more new clothes for the application mac address table
A kind of hardware structure diagram of the place network equipment is put, except the processor shown in Fig. 3, internal memory, network interface and non-volatile
Outside memory, the network equipment that device is located in embodiment may be used also generally according to the actual functional capability of the renewal of the mac address table
To include other hardware, this is repeated no more.
Fig. 4 is refer to, is a kind of block diagram of the updating device of mac address table shown in one exemplary embodiment of the application,
The device 400 can apply to the network equipment shown in Fig. 3, including：
List item stick unit 401, for when this equipment is edge device, if it is determined that network topological change, then unclear
Remove the machine mac address table；
Message structural unit 402, for the IP address based on the terminal device being connected with edge port for having stored and MAC
Address, constructs gratuitous ARP packet；
Packet sending unit 403, for sending the gratuitous ARP packet by non-edge ports；
Entry updating unit 404, for when the gratuitous ARP packet that other edge devices send is received, based on described
Gratuitous ARP packet updates the mac address table.
In an optional embodiment, the list item stick unit 401 can be also used for setting for non-edge when this equipment
When standby, if it is determined that network topological change, then the machine mac address table is not removed；The entry updating unit 404 can be also used for
When receiving from the gratuitous ARP packet of edge device, the mac address table is updated based on the gratuitous ARP packet.
In another optional embodiment, described device 400 can also include：
Address learning unit 405, for when receiving from the ARP messages or IP messages of terminal device, according to described
ARP messages or the IP messages learn IP address and the MAC Address of the terminal device.
In another optional embodiment, the determination network topological change can include：
This equipment is based on Port detecting to network topological change；Or this equipment receives topology and changes notice.
In another optional embodiment, the list item stick unit 401 is can be also used for when the addition of this equipment is multiple
During 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 are carried in the gratuitous ARP packet.
In said apparatus, the function of unit and effect realizes that process specifically refers in said method corresponding step
Process is realized, be will not be described here.
For device embodiment, as which corresponds essentially to embodiment of the method, so related part is referring to method reality
Apply the part explanation of example.Device embodiment described above is only schematically, wherein described as separating component
The unit of explanation can be or may not be physically separate, as the part that unit shows can be or can also
It is not physical location, you can be located at a place, or can also be distributed on multiple NEs.Can be according to reality
Need to select some or all of module therein to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The preferred embodiment of the application is the foregoing is only, not in order to limiting the application, all essences in the application
Within god and principle, any modification, equivalent substitution and improvements that is done etc. are should be included within the scope of the application protection.
Claims (10)
1. a kind of update method of mac address table, methods described are applied to the network equipment, it is characterised in that methods described includes：
When this equipment is edge device, if it is determined that network topological change, then the machine mac address table is not removed；
IP address and MAC Address based on the terminal device being connected with edge port for having stored, constructs gratuitous ARP packet；
The gratuitous ARP packet is sent by non-edge ports；
When the gratuitous ARP packet that other edge devices send is received, the MAC ground is updated based on the gratuitous ARP packet
Location table.
2. method according to claim 1, it is characterised in that methods described also includes：
When this equipment is non-edge equipment, if it is determined that network topological change, then the machine mac address table is not removed；
When receiving from the gratuitous ARP packet of edge device, the mac address table is updated based on the gratuitous ARP packet.
3. method according to claim 1, it is characterised in that methods described also includes：
When receiving from the ARP messages or IP messages of terminal device, according to the ARP messages or IP messages study institute
State IP address and the MAC Address of terminal device.
4. method according to claim 1, it is characterised in that the determination network topological change includes：
This equipment is based on Port detecting to network topological change；Or this equipment receives topology and changes notice.
5. method according to claim 1, it is characterised in that methods described also includes：
When this equipment adds multiple VLAN, the machine mac address table of not removing is changed with network topology for not removing in the machine
The corresponding mac address tables of VLAN of change；The VLAN ID of the VLAN of the network topological change are carried in the gratuitous ARP packet.
6. a kind of updating device of mac address table, described device are applied to the network equipment, it is characterised 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 then remove the machine
Mac address table；
Message structural unit, for the IP address based on the terminal device being connected with edge port for having stored and MAC Address, structure
Make gratuitous ARP packet；
Packet sending unit, for sending the gratuitous ARP packet by non-edge ports；
Entry updating unit, for when the gratuitous ARP packet that other edge devices send is received, based on the gratuitous ARP
Message updates the mac address table.
7. device according to claim 6, it is characterised in that
The list item stick unit is additionally operable to when this equipment is non-edge equipment, if it is determined that network topological change, then unclear
Remove the machine mac address table；
The entry updating unit is additionally operable to when receiving from the gratuitous ARP packet of edge device, based on the gratuitous ARP
Message updates the mac address table.
8. device according to claim 6, it is characterised in that described device also includes：
Address learning unit, for when receiving from the ARP messages or IP messages of terminal device, according to the ARP messages
Or the IP messages learn IP address and the MAC Address of the terminal device.
9. device according to claim 6, it is characterised in that the determination 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, it is characterised in that
The list item stick unit is additionally operable to when this equipment adds multiple VLAN, and the machine mac address table of not removing is not for
Remove mac address table corresponding with the VLAN of network topological change in the machine；Carry the network to open up in the gratuitous ARP packet
Flutter the VLAN ID of the VLAN of change.
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| CN201611040200.5A CN106506378B (en) | 2016-11-10 | 2016-11-10 | The update method and device of mac address table |
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| CN201611040200.5A CN106506378B (en) | 2016-11-10 | 2016-11-10 | The update method and device of mac address table |
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| CN111245700A (en) * | 2020-01-16 | 2020-06-05 | 新华三信息安全技术有限公司 | Loop detection method and device |
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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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| Publication number | Publication date |
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| CN106506378B (en) | 2019-09-06 |
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