CN100561971C - The list item method for rapidly converging reaches according to this list item and realizes packet fast forwarding method - Google Patents
The list item method for rapidly converging reaches according to this list item and realizes packet fast forwarding method Download PDFInfo
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- CN100561971C CN100561971C CNB2006100832037A CN200610083203A CN100561971C CN 100561971 C CN100561971 C CN 100561971C CN B2006100832037 A CNB2006100832037 A CN B2006100832037A CN 200610083203 A CN200610083203 A CN 200610083203A CN 100561971 C CN100561971 C CN 100561971C
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Abstract
The invention discloses a kind of list item method of convergence fast, source end equipment is established to the PMTU list item of destination equipment according to the MTU value of self transmission interface and sends datagram according to the length of this MTU value specified data message, the forwarding unit receiving data packets, if the length of data message is greater than the MTU value of forwarding unit transmission interface, then search the PMTU list item of the corresponding destination equipment that this forwarding unit preserves and send lookup result to source end equipment, source end equipment is revised corresponding PMTU list item according to this lookup result, and transmits according to this list item value length of partition data message again.The relevant PMTU list item of preserving by feedback transmission equipment in the process of data message transmission has reached the characteristics of setting up the PMTU list item fast and transmitting data message fast.
Description
Technical field
The present invention relates to data communication field, relate in particular to the quick method that restrains of a kind of list item of data communication field and use this method of the quick forwarding of list item realization data message of convergence fast.
Background technology
In the Network Transmission, in order to strengthen the forward efficiency of the network equipment, forwarding unit is not allow message is carried out burst sometimes, and the size of message can only be by the source end equipment decision of message, just has only the transmission source end of message message to be had the ability of burst.When intermediate equipment E-Packeted, if the length of this message to be transmitted surpasses MTU (Maximux transmission unit, the MTU) value of this intermediate equipment transmission interface, this message to be sent will be dropped.Simultaneously, forwarding unit can include the MTU value of this forwarding unit transmission interface to source end device replied ICMP (Internet Control Message Protocol, Internet Control Message Protocol) bag super large message in the ICMP bag.When source end equipment receives from the ICMP bag super large message of forwarding unit, will change the size that sends message, resend.Before source end equipment and destination equipment communicated, the MTU value that just needs the transmission of hop-by-hop detection network to allow was promptly learnt PMTU (Path Maximux transmission unit, PMTU) and is worth like this.
As shown in Figure 1, the MTU value of source end equipment 1 transmission interface is 3000, and the MTU value of forwarding unit 2 transmission interfaces is 2000, and the MTU value of forwarding unit 3 transmission interfaces is 1500.The length of supposing first message that source end equipment 1 sends is 3000, when forwarding unit 2 is transmitted this message, find that the length of this message has surpassed the MTU value of himself, then abandon this message and reply ICMP super large message, carry the MTU value 2000 of himself to source end equipment 1.After source end equipment 1 receives this super large message, the message that will transmit need again carries out burst and revises the PMTU list item of self, its transmission interface MTU value 2000 according to forwarding unit 2 feedbacks, it is 2000 that source end equipment 1 becomes every leaf length with message fragment, and changes the PMTU value of purpose IP address correspondence into 2000.Source end equipment 1 restarts to send message, current forwarding unit 2 successes message has been sent to forwarding unit 3, because the MTU value of forwarding unit 3 transmission interfaces is 1500, so being 2000 message, this length has been dropped again, reply ICMP bag overlength message to source end equipment 1 simultaneously, carry the MTU value 1500 of self.Source end equipment 1 is burst again, and every length is divided into 1500, then resends.Revise the PMTU value of self simultaneously, change the PMTU value of this purpose IP address correspondence into 1500.Current forwarding unit 2 and forwarding unit 3 be having forwarded message of success all, and destination equipment 4 has received message.Preserved the PMTU value of this purpose IP address on the end equipment of source, promptly along with being sent completely of first message, source end equipment has also been finished the study of PMTU on this path.
From the forwarding process of the network of Fig. 1, source end equipment through twice modification just can with destination address equipment success communication.Because the forwarding unit among Fig. 1 has only two, if have more a plurality of, if it is and more little the closer to the MTU value of the forwarding unit of destination address equipment, then message time of transmitting will be longer, and source end equipment will just can be finished study from the source end to destination PMTU through the modification of more times PMTU list item simultaneously.We as can be seen, the process of transmitting of whole message, length constantly is modified, and has increased transmitting time.The speed of the whole study of PMTU list item is slow in addition, and promptly convergence rate is slow, has brought extra expense to system.In addition,, constantly revise the PMTU list item and will make communication between plates continuous, bring extra expense to system if the source end is a distributed apparatus.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of PMTU of making list item method of convergence fast.
Another object of the present invention is to provide a kind of method of the data forwarding based on the PMTU list item.
For achieving the above object, technical scheme of the present invention is achieved in that source end equipment is established to the PMTU list item of destination equipment according to the MTU value of self transmission interface and sends datagram according to the length of this MTU value specified data message, the forwarding unit receiving data packets, if the length of data message is greater than the MTU value of forwarding unit transmission interface, then search the PMTU list item of the corresponding destination equipment that this forwarding unit preserves and send lookup result to source end equipment, source end equipment is revised corresponding PMTU list item according to this lookup result.
This lookup result comprises: find value corresponding in this PMTU list item that corresponding PMTU list item returns or do not find the MTU value of this forwarding unit transmission interface that corresponding PMTU list item returns.
Source end equipment sends a data message, forwarding unit receives this data message and whether decision continues to send datagram according to the MTU value of its transmission interface, if being less than or equal to the MTU value of this transmission interface, the length of data message to be sent continues to send this data message, otherwise check whether this forwarding unit preserves the PMTU list item of destination device, if have then this PMTU list item information is sent to source end equipment, source end equipment carries out the transmission of data message again according to the size that this PMTU list item information changes data message.If this PMTU list item information not, then the MTU value with this forwarding unit transmission interface sends to source end equipment, and source end equipment carries out the transmission of data message again according to the size that this MTU value changes data message.
Preferably, when not obtaining PMTU information that forwarding unit sends or MTU information, the length of source end equipment sending data message is based on the size of himself transmission interface MTU value.
Preferably, end equipment in source is set up the PMTU list item that arrives destination device when sending datagram.
Source end equipment is not when obtaining PMTU information that forwarding unit sends or MTU value, and the MTU value is the MTU value of its transmission interface in the PMTU list item of the arrival destination device of its foundation.
Source end equipment is revised the PMTU list item that arrives corresponding destination device when receiving PMTU information that forwarding unit sends or MTU value.
Description of drawings
Fig. 1 is the data message forwarding networking diagram;
Fig. 2 is a data message forwarding flow chart of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 2 is a data message forwarding flow chart of the present invention.
The first step: source end equipment sending data message.Source end equipment will decide the size of data message according to the MTU value of own transmission interface when sending datagram, data message is carried out sending behind the burst, and foundation is based on the PMTU list item of source end equipment transmission interface MTU value.
Second step: the forwarding unit receiving data packets, and judge whether the length of this data message is less than or equal to the MTU value of its transmission interface.If be less than or equal to this MTU value, then this data message sent to next equipment; If greater than this MTU value, then abandon this message and check whether this forwarding unit preserves the PMTU list item of destination device.If had with relevant PMTU message transmission to source end equipment.Otherwise the MTU message transmission of this forwarding unit transmission interface is arrived source end equipment.
PMTU table comprises three parameters: the IP address of destination device arrives the MTU value of this destination device and life span.If the IP address of the destination device of the data message correspondence that source end equipment sends then directly feeds back to source end equipment with this MTU value in the PMTU of this forwarding unit table.If do not have destination device IP address in the PMTU that this forwarding unit the is preserved table, then the MTU value with this forwarding unit transmission interface sends to source end equipment.If this forwarding unit is not preserved the PMTU table, then directly feed back the MTU value of this forwarding unit.
The 3rd step: source end equipment carries out the transmission of data message again according to the PMTU information of feedback or the size of MTU value back change message, and revises the PMTU table content of oneself.
After source end equipment receives the PMTU information or MTU value that forwarding unit sends, the data of required transmission are carried out again burst to be handled, revise every the size and then send, also to make amendment simultaneously, the MTU value that arrives destination device be changed into PMTU information or the MTU value of feeding back by forwarding unit the PMTU list item of initial foundation.
The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, the method for the quick convergence of a kind of list item, it is characterized in that: source end equipment is established to the PMTU list item of destination equipment according to the MTU value of self transmission interface and sends datagram according to the length of this MTU value specified data message, the forwarding unit receiving data packets, if the length of data message is greater than the MTU value of forwarding unit transmission interface, then search the PMTU list item of the corresponding destination equipment that this forwarding unit preserves and send lookup result to source end equipment, source end equipment is revised corresponding PMTU list item according to this lookup result.
2, the quick method of convergence of list item as claimed in claim 1, it is characterized in that: described lookup result comprises: find value corresponding in this PMTU list item that corresponding PMTU list item returns or do not find the MTU value of this forwarding unit transmission interface that corresponding PMTU list item returns.
3, a kind of list item as claimed in claim 1 is realized the method that data message is transmitted fast, it is characterized in that: source end equipment sends a data message, forwarding unit receives this data message and whether decision continues to send datagram according to the MTU value of its transmission interface, if being less than or equal to the MTU value of this transmission interface, the length of data message to be sent continues to send this data message, otherwise check whether this forwarding unit preserves the PMTU list item of destination device, if have then this PMTU list item information is sent to source end equipment, source end equipment carries out the transmission of data message again according to the size that this PMTU list item information changes data message.
4, the quick method of transmitting of data message as claimed in claim 3, it is characterized in that: if this PMTU list item information not, then the MTU value with this forwarding unit transmission interface sends to source end equipment, and source end equipment carries out the transmission of data message again according to the size that this MTU value changes data message.
5, the method transmitted fast of data message as claimed in claim 3 is characterized in that: when not obtaining PMTU information that forwarding unit sends or MTU information, the length of source end equipment sending data message is based on the size of himself transmission interface MTU value.
6, the quick method of transmitting of data message as claimed in claim 3, it is characterized in that: source end equipment is set up the PMTU list item that arrives destination device when sending datagram.
7, the quick method of transmitting of data message as claimed in claim 6, it is characterized in that: source end equipment is not when obtaining PMTU information that forwarding unit sends or MTU value, and the MTU value is the MTU value of its transmission interface in the PMTU list item of the arrival destination device of its foundation.
8, the method transmitted fast of data message as claimed in claim 7 is characterized in that: source end equipment is revised the PMTU list item of the corresponding destination device of arrival when receiving PMTU information that forwarding unit sends or MTU value.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100832037A CN100561971C (en) | 2006-05-30 | 2006-05-30 | The list item method for rapidly converging reaches according to this list item and realizes packet fast forwarding method |
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| CNB2006100832037A CN100561971C (en) | 2006-05-30 | 2006-05-30 | The list item method for rapidly converging reaches according to this list item and realizes packet fast forwarding method |
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| CN1852221A CN1852221A (en) | 2006-10-25 |
| CN100561971C true CN100561971C (en) | 2009-11-18 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101374101B (en) * | 2007-08-22 | 2011-05-04 | 华为技术有限公司 | Method, equipment and system for transmitting multiplexing packet |
| CN101552728B (en) * | 2009-05-12 | 2012-05-23 | 北京师范大学 | Path MTU discovery method and system facing to IPV6 |
| CN101635685B (en) * | 2009-08-14 | 2012-07-11 | 杭州华三通信技术有限公司 | Method and device for acquiring PMTU by learning |
| CN102594505A (en) * | 2012-02-08 | 2012-07-18 | 华为技术有限公司 | Data transmission method and device |
| CN103326947B (en) * | 2013-02-22 | 2017-06-30 | 新华三技术有限公司 | The learning method of PMTU, the sending method of data message and the network equipment |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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