CN101127709A - A method and device for updating port address in address parsing protocol table - Google Patents
A method and device for updating port address in address parsing protocol table Download PDFInfo
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Abstract
The utility model provides a method and a device to update a plurality of port addresses in an address resolution protocol (ARP) table, which is characterized in that when a media access control (MAC) migration is initiated by a port migration, a detected port address and a corresponding MAC address after the port migration are obtained during the MAC migration; a port address in the ARP table, corresponding to the detected MAC address, is updated to be the detected port address. The utility model has the advantages that the switch does not need to wait until the ARP ages so that the fast update of the port addresses in the ARP table is realized and that the third layer forwarding not correctly carrying on in a long time during the port migration is avoided.
Description
Technical field
The present invention relates to the communication field technology, particularly relate to the method and apparatus of a kind of scheduler analytic protocol table middle port address.
Background technology
When switch carries out three layers of forwarding, usually need utilize address resolution protocol (ARP, AddressResolution Protocol) table determines to send the port address of message, this ARP table can comprise Internet Protocol (IP, Internet Protocol) information such as address, medium access control (MAC, Media AccessController) address, port address.
The process that switch carries out three layers of forwarding roughly is: when switch receives certain message, earlier according to the purpose IP address search routing table of carrying in the message, determine the IP address of next jumping from routing table; According to the IP address search ARP table of next jumping, from the ARP table, determine corresponding MAC Address and port address again, the target MAC (Media Access Control) address in the message is replaced with the MAC Address of determining from the ARP table, from the corresponding port address message is sent then.That is to say that IP address, MAC Address and the port address in the ARP table has the relation of strict correspondence, has only the corresponding relation that keeps correct, can correctly carry out three-tier message and transmit.
In the practical application, if variation has taken place in the position of certain equipment that is connected with switch, perhaps variation has taken place in topology of networks, so, the port that connects this equipment in the switch just may move, cause the corresponding relation and the actual conditions of IP address, MAC Address and port address in the ARP table not to be inconsistent, equipment described here refers to the communication equipments such as subscriber's main station that are connected with switch.Such as: switch A is connected with equipment a1 by port one, has the IP address of equipment a1, the MAC Address of equipment a1 and a list item of the such corresponding relation of port one in the ARP table of switch A.If variation has taken place in the position of equipment a1, the equipment a1 after the variation no longer is connected with switch A by port one, but is connected with switch by port 2, and promptly migration has taken place port, and at this moment, the corresponding relation that former ARP table is write down does not just meet with actual conditions.
In the prior art,, utilize the ARP aging mechanism to realize usually for corresponding relation and the actual conditions that make IP address, MAC Address and port address in the ARP table are consistent.That is to say, when the ARP list item is aging, exchange opportunity is initiated the ARP learning process, and with the reciprocal process of self connection device in regain the corresponding relation of IP address, MAC Address and the port address of this equipment, upgrade the ARP list item according to the corresponding relation that regains.Like this,, just can when upgrading the ARP list item, original port address be modified to new port address, the corresponding relation of IP address, MAC Address and port address and actual conditions are consistent if switch with the port that certain equipment links to each other variation has taken place.Described herely port address original in the ARP list item is changed to new port address also can be called ARP migration usually.
But in the prior art, the ARP ageing time is generally long, such as the acquiescence ageing time can be set is 20 minutes, and upgrading ARP list item middle port address also will be slow, thereby causes switch can't correctly carry out the forwarding of three-tier message in the quite a long time.
Summary of the invention
First goal of the invention of the present invention provides the method for a kind of scheduler analysis protocol (ARP) table middle port address, can the port address in the ARP table be upgraded fast, avoids can't correctly carrying out three layers of forwarding for a long time when migration takes place port.
The equipment that second goal of the invention of the present invention provides a kind of ARP of renewal table middle port address can upgrade fast to the port address in the ARP table, avoids can't correctly carrying out three layers of forwarding for a long time when migration takes place port.
In order to reach above-mentioned first goal of the invention, the technical scheme that the present invention proposes is:
The method of a kind of scheduler analytic protocol table middle port address, this method is:
A, when the media access control MAC migration carrying out being caused by port migration, obtain port address and corresponding MAC Address after the detected port migration in the MAC transition process;
B, will be updated to detected port address with the pairing port address of detected MAC Address in the ARP table.
In the such scheme, the method for port address in the described acquisition MAC transition process after the detected port migration and corresponding MAC Address is:
From interrupt signal, obtain port address and corresponding MAC Address after the port migration, described interrupt signal be produced when detecting the port migration in the MAC transition process comprise the port address after the port migration and the interrupt signal of corresponding MAC Address.
In the such scheme, between described steps A and the step B, this method further comprises:
According to the prior MAC software register that comprises the ARP attribute that is provided with of detected MAC Address inquiry, inquire the list item that comprises detected MAC Address, and according to whether comprising detected MAC Address in the ARP determined property ARP of the list item table, if, execution in step B then.
In the such scheme, described ARP table comprises ARP software register and ARP hardware list, and described step B comprises:
To be updated to detected port address with the pairing port address of detected MAC Address in the ARP software register, give the ARP hardware list synchronously with the ARP software register again; Perhaps,
To be updated to detected port address with the pairing port address of detected MAC Address in the ARP hardware list, give the ARP software register synchronously with the ARP hardware list again.
In order to reach above-mentioned second goal of the invention, the technical scheme that the present invention proposes is:
The equipment of a kind of scheduler analytic protocol table middle port address, this equipment comprises:
Acquiring unit is used for obtaining port address and corresponding MAC Address after the detected port migration in the MAC transition process when the MAC migration of carrying out being caused by the port migration;
Memory cell is used to preserve the ARP table;
The ARP updating block is used for the ARP table is updated to detected port address with the pairing port address of detected MAC Address.
In the such scheme, this equipment further comprises:
Judgement unit, be used for inquiring about the MAC software register that memory cell is preserved according to detected MAC Address, inquire the list item that comprises detected MAC Address, the ARP determined property that is provided with in advance according to list item goes out in the ARP table to comprise detected MAC Address, and starts the ARP updating block;
Described memory cell is further used for preserving the MAC software register.
In sum, the method and apparatus of a kind of scheduler analytic protocol table middle port address that the present invention proposes, can when medium access control (MAC) migration of carrying out being caused, from the MAC transition process, obtain port address and corresponding MAC Address after detected port moves by the port migration; And will be updated to detected port address with the pairing port address of detected MAC Address in the ARP(Address Resolution Protocol) table.Because it is aging that the switch among the present invention program needn't be waited for ARP, can realize the port address in the ARP table is upgraded fast, thereby avoid when migration takes place port, can't correctly carrying out three layers of forwarding for a long time.
Description of drawings
Fig. 1 is the flow chart that the present invention realizes upgrading ARP table middle port address approach;
Fig. 2 is a flow chart of using the present invention program's method embodiment;
Fig. 3 is the basic structure schematic diagram that the present invention realizes upgrading ARP table middle port address device;
Fig. 4 is a structural representation of using the present invention program's apparatus embodiments.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
For when originating port moves, the port address in the ARP(Address Resolution Protocol) that can upgrade in time the table, the present invention will upgrade the process of ARP table middle port address and carry out related with the MAC migration that the port migration causes.Like this, the present invention just can upgrade according to the port address that obtains in the MAC transition process, and needn't wait for that ARP is aging, thereby arrives the purpose that ARP table middle port address is upgraded fast.
Fig. 1 is that the present invention realizes the method for updating flow chart is carried out in ARP table middle port address.As shown in Figure 1, this method can comprise:
Step 101: when the MAC migration carrying out being caused, obtain port address and corresponding MAC Address after the detected port migration in the MAC transition process by port migration.
In the practical application, when migration takes place port, not only need to upgrade the port address in the ARP table, also need to upgrade the port address of the MAC table that is used for the two layer message forwarding.The MAC table comprises MAC hardware list and MAC software register, then comprises MAC Address and corresponding port address in the list item of MAC table.If ARP table and MAC table comprise the MAC Address of certain equipment simultaneously, so also should be identical in ARP table and MAC table with this MAC Address corresponding port address.Such as: comprise the MAC Address of device A in the ARP table, the corresponding port address is the port one of switch, so, also comprises the MAC Address of device A in the MAC table, and the corresponding port address also should be the port one of switch.
MAC hardware list described here is that the MAC that switch carries out directly using when two layer message is transmitted shows, and generally can be kept in the read-only memory (ROM); MAC software register then switch software is provided with for the ease of the managing MAC address, is from the synchronous resulting MAC table of MAC hardware list.
Usually, cause the renewal of MAC table middle port address also can be called the MAC migration by the port migration.In order to describe this step better, below earlier the situation of MAC migration is simply introduced:
If certain device location or the topology of networks that are connected with switch change, cause switch to move with the port that this equipment is connected, when switch receives the message of this equipment at the port after migration, the situation that can detect the corresponding relation of MAC Address of the port address that receives message and this equipment and MAC table record is inconsistent, will produce interruption, thereby cause the MAC migration.The detailed process of MAC migration can for: switch detects the interrupt signal that is produced by the port migration, and described interrupt signal comprises port address and the corresponding MAC Address after the port migration; Switch will be updated to detected port address with the pairing port address of detected MAC Address in the MAC hardware list, and gives the MAC software register that is provided with in advance synchronously with the MAC hardware list.
Above-mentioned is the process of MAC migration, and switch can obtain port address and the corresponding MAC Address after the port migration from the interrupt signal of MAC transition process.
Step 102: will be updated to detected port address with the pairing port address of detected MAC Address in the ARP table.
Because the corresponding relation of MAC Address and port address in the MAC table, and the corresponding relation of MAC Address and port address is identical in the ARP table, as long as from step 101, obtain port address and corresponding MAC Address after the migration, just can the port address in the ARP table be upgraded.
In the practical application, if some equipment that is connected with switch only allows to carry out two layers of forwarding, and can not carry out three layers of forwarding, so, the MAC Address of these equipment and the corresponding relation of port address just exist only in the MAC table, and are not kept in the ARP table.In this case, just can between step 101 and step 102, further comprise:
The MAC software register that comprises the ARP attribute that switch is provided with in advance according to detected MAC Address inquiry, inquire the list item that comprises detected MAC Address, and whether comprise detected MAC Address in the ARP determined property ARP table according to this list item, if then execution in step 102.
That is to say, can be that the list item of MAC software register increases the unexistent ARP attribute of MAC hardware list in advance, is used for representing whether the MAC Address of MAC software register also is present in the ARP table simultaneously.Like this, when switch produces interrupt signal, just can be when there be the MAC Address that interrupt signal comprises in clear and definite ARP table, just utilize the port address of step 102 couple ARP in showing to upgrade, otherwise switch can not shown not upgrade to ARP.
For the present invention program is described better, be described in detail with a preferred embodiment below.
In the present embodiment, suppose device A because the position changes, the port that switch is attached thereto is moved to port 2 from port one; Switch allows device A is carried out the forwarding of two layer message and three-tier message; Comprise MAC hardware list, MAC software register and ARP table or the like in the switch.
Before the port migration, MAC hardware tableau format can be as shown in Table 1:
| MAC Address | Port address |
| MAC-A | Port one |
| … | … |
Table one
Wherein, the MAC Address of " MAC-A " indication equipment A, " port one " expression switch is undertaken by port one and device A alternately.
Before the port migration, MAC software tableau format can be as shown in Table 2:
| MAC Address | Port address | The ARP attribute |
| MAC- A | Port one | 1 |
| … | … | … |
Table two
Wherein, the MAC Address of " MAC-A " indication equipment A, " port one " expression switch is undertaken alternately by port one and device A, also comprises the list item at device A in " the ARP attribute is 1 " expression ARP table, promptly has the MAC Address of device A.
Before the port migration, the ARP tableau format in the switch can be as shown in Table 3:
| The IP address | MAC Address | Port address |
| IP-A | MAC-A | Port one |
| … | … | … |
Table three
Wherein, the IP address of " IP-A " indication equipment A, the MAC Address of " MAC-A " indication equipment A, " port one " expression switch is undertaken by port one and device A alternately.
As seen, before the port migration, the MAC Address of device A and the corresponding relation of port address in the MAC table, identical with the corresponding relation of the MAC Address of device A in the ARP table and port address.
After this, suppose that the position of device A changes, switch receives message from device A from port 2, and the message that can detect the MAC Address that carries device A is this corresponding relation that receives from port 2.Original corresponding relation is inconsistent in this corresponding relation and the hardware MAC table, to cause the MAC migration, its process can detect the interrupt signal that is produced by the port migration for: switch, and described interrupt signal comprises port 2 and the corresponding MAC-A after the port migration; Switch will be updated to port 2 with the pairing port address of MAC-A in the MAC hardware list, gives the MAC software register that is provided with in advance synchronously with the MAC hardware list.
Switch upgrades after the MAC hardware list, and its form can be as shown in Table 4:
| MAC Address | Port address |
| MAC-A | Port 2 |
| … | … |
Table four
After the synchronous MAC software register of switch, its form can be as shown in Table 5:
| MAC Address | Port address | The ARP attribute |
| MAC-A | Port 2 | 1 |
| … | … | … |
Table five
Above-mentioned is the situation of MAC migration, in the present embodiment, when MAC migration that switch carries out being caused by the port migration, also needs the port address in the ARP table is upgraded.
Fig. 2 is the flow chart that present embodiment realizes upgrading ARP table middle port address approach.As shown in Figure 2, this method comprises:
Step 201: when the MAC migration carrying out being caused by port migration, switch obtains the port address after the detected port migration and the MAC Address of correspondence from interrupt signal.
Here, the port address that comprises in the interrupt signal is exactly " port 2 ", and corresponding MAC Address is exactly " MAC-A ".
Step 202: switch inquires the list item that comprises detected MAC Address according to detected MAC Address inquiry MAC software register.
Step 203: switch goes out in the ARP table to comprise detected MAC Address according to ARP determined property in the list item that inquires.
Here, because the ARP property value is " 1 " in the list item that inquires, comprise the MAC Address of device A in the expression ARP table.In the practical application, if do not allow device A is carried out three layers of forwarding, then the ARP attribute in this list item can be " 0 ", does not comprise the MAC Address of device A in the expression ARP table, and switch will no longer continue to carry out subsequent step, and directly process ends gets final product.
Step 204: switch will be updated to detected port address with the pairing port address of detected MAC Address in the ARP table.
In this step, switch will upgrade the port address in the ARP table, and the ARP table after the renewal can be as shown in Table 6:
| The IP address | MAC Address | Port address |
| IP-A | MAC-A | Port 2 |
| … | … | … |
Table six
With the MAC epiphase seemingly, ARP table also can be divided into ARP hardware list and ARP software in fact.Wherein, the ARP hardware list is that switch carries out three layers of ARP table that directly uses when transmitting, and the ARP software register ARP table that to be switch software be provided with for the ease of management.
In this case, this step upgrade the port address in the ARP table process can for: will be updated to detected port address with the pairing port address of detected MAC Address in the ARP software register, give the ARP hardware list synchronously with the ARP software register again.Perhaps, will be updated to detected port address with the pairing port address of detected MAC Address in the ARP hardware list, give the ARP software register synchronously with the ARP hardware list again.
In addition, MAC migration and ARP migration itself remain two processes in the embodiment of the invention, but MAC migration can startup ARP migration, and utilize the ARP attribute that in the MAC table, is provided with that MAC migration and ARP migration are associated.
Use the present embodiment scheme, because switch can start the renewal to ARP table middle port address when the port migration causes the MAC migration, so, if switch is carrying out the three-tier message forwarding to device A, just can wait for that ARP is aging and the port address in the ARP table upgraded fast, thereby the three-tier message that receives in time correctly is transmitted to device A, avoids device A to interrupt the reception of three-tier message for a long time.
At said method, the present invention also proposes the equipment of a kind of scheduler analytic protocol table middle port address.Fig. 3 is the basic structure schematic diagram of this equipment, and as shown in Figure 3, this equipment comprises:
Acquiring unit 301 is used for obtaining port address and corresponding MAC Address after detected port moves from the MAC transition process when the MAC migration of carrying out being caused by the port migration.
Fig. 4 is an apparatus embodiments internal structure schematic diagram of using the present invention program.As shown in Figure 4, this embodiment not only comprises acquiring unit 301, memory cell 302, ARP updating block 303 in the practical application among Fig. 3, and this equipment can also comprise:
That is to say that when the MAC migration of carrying out being caused by the port migration, acquiring unit 301 obtains port address and the corresponding MAC Address after the detected port migration from the MAC transition process; Judgement unit 304 is inquired about the MAC software register that is kept in the memory cell 302 according to detected MAC Address, inquire the list item that comprises detected MAC Address, the ARP determined property that is provided with in advance according to list item goes out in the ARP table to comprise detected MAC Address, and starts ARP updating block 303; ARP updating block 303 will be updated to detected port address with the pairing port address of detected MAC Address in the ARP table.
Certainly, in the practical application, memory cell 302 can also be divided into different memories such as ROM, RAM, and MAC hardware list, ARP hardware list are kept among the ROM, and MAC software register, ARP software register etc. is kept among the RAM.Because MAC software register and ARP software register keep synchronously with MAC hardware list and ARP hardware list respectively, so the memory of preserving MAC software register and ARP software register also is commonly referred to map section (shadow).
Use the present invention program, because switch can obtain port address and corresponding MAC Address after the port migration when carrying out the MAC migration, and start the renewal of ARP table middle port address according to the port address after the port migration and corresponding MAC Address, needn't wait for that ARP is aging, thereby realize quick renewal, avoid switch when migration takes place port, can't correctly carry out three layers of forwarding for a long time the ARP table.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the method for a scheduler analytic protocol table middle port address is characterized in that this method is:
A, when the media access control MAC migration carrying out being caused by port migration, obtain port address and corresponding MAC Address after the detected port migration in the MAC transition process;
B, will be updated to detected port address with the pairing port address of detected MAC Address in the ARP table.
2. method according to claim 1 is characterized in that, the method for port address in the described acquisition MAC transition process after the detected port migration and corresponding MAC Address is:
From interrupt signal, obtain port address and corresponding MAC Address after the port migration, described interrupt signal be produced when detecting the port migration in the MAC transition process comprise the port address after the port migration and the interrupt signal of corresponding MAC Address.
3. method according to claim 1 and 2 is characterized in that, between described steps A and the step B, this method further comprises:
According to the prior MAC software register that comprises the ARP attribute that is provided with of detected MAC Address inquiry, inquire the list item that comprises detected MAC Address, and according to whether comprising detected MAC Address in the ARP determined property ARP of the list item table, if, execution in step B then.
4. method according to claim 1 and 2 is characterized in that, described ARP table comprises ARP software register and ARP hardware list, and described step B comprises:
To be updated to detected port address with the pairing port address of detected MAC Address in the ARP software register, give the ARP hardware list synchronously with the ARP software register again; Perhaps,
To be updated to detected port address with the pairing port address of detected MAC Address in the ARP hardware list, give the ARP software register synchronously with the ARP hardware list again.
5. the equipment of a scheduler analytic protocol table middle port address is characterized in that this equipment comprises:
Acquiring unit is used for obtaining port address and corresponding MAC Address after the detected port migration in the MAC transition process when the MAC migration of carrying out being caused by the port migration;
Memory cell is used to preserve the ARP table;
The ARP updating block is used for the ARP table is updated to detected port address with the pairing port address of detected MAC Address.
6. equipment according to claim 5 is characterized in that, this equipment further comprises:
Judgement unit, be used for inquiring about the MAC software register that memory cell is preserved according to detected MAC Address, inquire the list item that comprises detected MAC Address, the ARP determined property that is provided with in advance according to list item goes out in the ARP table to comprise detected MAC Address, and starts the ARP updating block;
Described memory cell is further used for preserving the MAC software register.
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