CN105530193B - Determine method, the network equipment and the system of tunnel maximum transmission unit - Google Patents
Determine method, the network equipment and the system of tunnel maximum transmission unit Download PDFInfo
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- CN105530193B CN105530193B CN201410525848.6A CN201410525848A CN105530193B CN 105530193 B CN105530193 B CN 105530193B CN 201410525848 A CN201410525848 A CN 201410525848A CN 105530193 B CN105530193 B CN 105530193B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
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Abstract
Offer of the embodiment of the present invention discloses method, the network equipment and the system of a kind of determining tunnel maximum transmission unit MTU value, applies on the tunnel by Ingress node to Egress node.This method comprises: receiving node of the Ingress node on tunnel, which sends the first extension two-way converting detection BFD, controls message, the first extension BFD control message includes MTU flag bit；Ingress node receives the second extension BFD control message that the receiving node returns, and carries interface mtu value of the receiving node on the tunnel in the second extension BFD control message；Ingress node from the receiving node that the receiving node returns on the tunnel interface mtu value and the tunnel in the interface mtu value on the Ingress node, the smallest MTU value is selected, as the tunnel MTU value.This method helps accurately to determine the tunnel MTU value on a tunnel, to reduce fragment number and secondary fragment bring reconstructing failure problem.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of method of determining tunnel maximum transmission unit, network are set
Standby and system.
Background technique
Maximum transmission unit (MTU) refers to the maximum data packet size that can pass through above a certain layer of communication protocol a kind of
(as unit of byte).This parameter of maximum transmission unit is usually related (network interface card, serial ports etc.) with communication interface.
It defines tunnel maximum transmission unit (PMTU) on the basis of MTU, refers to and passed through from source address to destination address
On one internet transmissions tunnel, the minimum value for the maximum transmission unit (MTU) that all-network protocol IP is jumped.In other words,
It is the maximum value that the maximum transmission unit in this " tunnel " can be passed through without further fragment.
Internet Protocol allows IP fragmentation, and datagram packet can be thus divided into sufficiently small segment to pass through those most
Big transmission unit is less than the link of the datagram original size.Specifically, if initial data message is more than to send to connect
Mouth MTU, just carries out fragment to message, if IP fragmentation also will do it secondary point when passing through smaller interface mtu on tunnel
Piece.After fragment reaches destination, the recombination foundation by (message ID+ source IP+destination IP+protocol type) as the same message,
Position of the current slice in entire IP packet is positioned according to fragment Flag and the Fragment offset of message.) this fragment
Process occurs IP layers (third layer of open system interconnection osi model, i.e. network layer), it, which is used, sends packets to
The value of the maximum transmission unit of the network interface of chain road.The fragment of original packet has all been coupled with label, such destination host
IP layer can be by packet recombining at original datagram.
In a communication network, when data message crossing-river tunnel transmits, in tunnel portal it is possible that because data message ruler
The very little interface mtu greater than tunnel portal equipment and cause tunnel portal position carry out fragment, tunnel exit carry out fragment weight
Group.As the MTU of tunnel intermediate node, less than tunnel starting point MTU when, need to carry out the data message secondary fragment, and
And if encapsulated again to data message elder generation fragment, recombination risk can be also brought, i.e., if in tunnel intermediate node because MTU is less than tunnel
The MTU of road starting point and if carrying out secondary fragment to fragment message, after the second fragment message and a fragment after secondary fragment
The first fragment message locating for level it is different, thus cause termination point of a tunnel to fail fragment reassembly.
Summary of the invention
Method, the network equipment and the system of determining tunnel maximum transmission unit provided in an embodiment of the present invention, solve number
According to message when transmitting on tunnel, need to carry out asking for secondary fragment and secondary fragment bring data message reconstructing failure
Topic.
To solve the above-mentioned problems, first aspect of the embodiment of the present invention provides a kind of determining tunnel maximum transmission unit MTU
The method of value, the method are applied on the tunnel by Ingress node to Egress node, comprising: the Ingress node is to the tunnel
Receiving node on road sends the first extension two-way converting detection BFD and controls message, and the first extension BFD control message includes
MTU flag bit, the MTU flag bit are used to indicate the receiving node and return to the receiving node in institute to the Ingress node
State the MTU value of the interface on tunnel, the receiving node be on the tunnel other than the Ingress node, pass through it is all
Node；The Ingress node receives the second extension BFD control message that the receiving node returns, the second extension BFD control
Interface mtu value of the receiving node on the tunnel is carried in message processed；The Ingress node is returned from the receiving node
Interface mtu value of the receiving node returned in the interface mtu value and the tunnel on the tunnel on the Ingress node
In, the smallest MTU value is selected, as the tunnel MTU value.
In the first possible implementation of the first aspect, the MTU flag bit the first extension BFD control
The reserved value mark of a bit identification or the Diag field in the diagnosis code Diag field of message.
With reference to first aspect or the first possible implementation of first aspect, second in first aspect are possible
Implementation in, further includes: the second extension BFD control message includes MTU type lengths values TLV, described for carrying
Interface mtu value of the receiving node on the tunnel.
The possible implementation of second with reference to first aspect, in the third possible implementation of first aspect
In, further includes: the MTU TLV is specifically included: type Type, length Length and value Value, described in the Type instruction
The type of Value is MTU, and the Length indicates the length of the MTU TLV, and the Value is the receiving node in institute
State the interface mtu value on tunnel；The MTU TLV is located at the tail portion of the first extension BFD control message.
With reference to first aspect or first aspect the first to the third possible implementation, the of first aspect
In four kinds of possible implementations, further includes: the Ingress node sends the first extension BFD to receiving node and controls message, institute
The life span ttl value in the tunnel packet that Ingress node passes through setting carrying the first extension BFD control message is stated,
To complete on the specified receiving node for sending the first extension BFD control message on the tunnel.
With reference to first aspect or first aspect the first to the 4th kind of any possible implementation, in first aspect
The 5th kind of possible implementation in, further includes: if the receiving node be the Egress node, the receiving node
On interface mtu value be incoming interface of the tunnel in the Egress node on the tunnel MTU value；And/or if institute
Stating receiving node is that the Ingress node is to the intermediate node between the Egress node on the tunnel, then the receiving node
On interface mtu value be the tunnel pass through the receiving node incoming interface MTU value and outgoing interface MTU value in minimum value.
To solve the above-mentioned problems, second aspect of the embodiment of the present invention provides a kind of side for sending maximum transmission unit MTU
Method, the method are applied on the tunnel by Ingress node to Egress node, which comprises are entered described in receiving node reception
The first extension two-way converting detection BFD control message that mouth node is sent, it includes MTU mark that the first extension BFD, which controls message,
Will position, the MTU flag bit are used to indicate the receiving node and return to the receiving node in the tunnel to the Ingress node
Interface mtu value on road；The receiving node obtains interface mtu value of the receiving node on the tunnel；The reception
Node returns to the second extension BFD to Ingress node and controls message, carries the reception section in the second extension BFD control message
Interface mtu value of the point on the tunnel.
In the first possible implementation of the second aspect, comprising: the MTU flag bit first extension
BFD controls the reserved value mark of a bit identification or the Diag field in the diagnosis code Diag field of message.
In conjunction with the possible implementation of the first of second aspect or second aspect, second in second aspect may
Implementation in, the second extension BFD control message specifically includes: MTU type lengths values TLV, for carrying described connect
Receive interface mtu value of the node on the tunnel.
In conjunction with second of second aspect possible implementation, in the third possible implementation of the second aspect,
The MTU TLV is specifically included: type Type, length Length and value Value, the Type indicate the type of the Value
The length of the MTU TLV is indicated for MTU, the Length, the Value is the receiving node connecing on the tunnel
Mouth MTU value；The MTU TLV is located at the tail portion of the first extension BFD control message.
In conjunction with the first of second aspect or second aspect to the third any possible implementation, in second aspect
The 4th kind of possible implementation in, further includes: if the receiving node be the Egress node, the receiving node
On interface mtu value be incoming interface of the tunnel in the Egress node on the tunnel MTU value；And/or if institute
Stating receiving node is that the Ingress node is to the intermediate node between the Egress node on the tunnel, then the receiving node
On interface mtu value be the tunnel pass through the receiving node incoming interface MTU value and outgoing interface MTU value in minimum value.
In conjunction with the first of second aspect or second aspect to the 4th kind of any possible implementation, in second aspect
The 5th kind of possible implementation in, the receiving node receive Ingress node send first extension two-way converting detection
BFD is controlled after message, further includes: the tunnel of receiving node parsing carrying the first extension BFD control message
Life span ttl value in message sends the receiving node to the Ingress node and exists if parsing ttl value equal to 1
Interface mtu value on the tunnel.
To solve the above-mentioned problems, the third aspect of the embodiment of the present invention provides a kind of network equipment, for determining tunnel most
Big transmission unit MTU value, the network equipment are applied on the tunnel by Ingress node to Egress node, comprising: transmission unit,
The first extension two-way converting detection BFD, which is sent, for the receiving node on the tunnel controls message, the first extension BFD
Controlling message includes MTU flag bit, and the MTU flag bit is used to indicate the receiving node to described in Ingress node return
The MTU value of interface of the receiving node on the tunnel, the receiving node be the tunnel in addition to the Ingress node with
Outside, all nodes passed through；Receiving unit, the second extension BFD control message returned for receiving the receiving node are described
Interface mtu value of the receiving node on the tunnel is carried in second extension BFD control message；Determination unit, for from
Interface mtu value and the tunnel of the receiving node that the receiving node returns on the tunnel are in the Ingress node
On interface mtu value in, the smallest MTU value is selected, as the tunnel MTU value.
In the first possible implementation of the third aspect, further includes: TTL setting unit, for carrying institute to be arranged
The life span ttl value in the tunnel packet of the first extension BFD control message is stated, to complete the first extension BFD
Control message is sent on the specified receiving node on the tunnel.
To solve the above-mentioned problems, fourth aspect of the embodiment of the present invention provides a kind of network equipment, for sending tunnel most
Big transmission unit MTU value, the network equipment are applied on the tunnel by Ingress node to Egress node, comprising: receiving unit,
The the first extension two-way converting detection BFD control message sent for receiving the Ingress node, the first extension BFD control
Message includes MTU flag bit, and the MTU flag bit is used to indicate the receiving node and returns to the reception to the Ingress node
Interface mtu value of the node on the tunnel；Acquiring unit, for obtaining interface of the receiving node on the tunnel
MTU value；Transmission unit controls message for returning to the second extension BFD to Ingress node, and the second extension BFD controls message
The middle interface mtu value for carrying the receiving node on the tunnel.
To solve the above-mentioned problems, the 5th aspect of the embodiment of the present invention provides a kind of for determining tunnel maximum transmission unit
The system of MTU value, comprising: the network equipment of the above-mentioned third aspect and the network equipment of fourth aspect.
The embodiment of the present invention controls message by extension BFD, increases the MTU flag bit and the MTUTLV, Yi Jishe
The method for setting TTL is accurately determined tunnel MTU, helps to reduce fragment number and secondary fragment bring reconstructing failure problem.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application can also be obtained according to these attached drawings other for those of ordinary skill in the art
Attached drawing.
Fig. 1 is a kind of flow diagram of determining tunnel MTU method of the embodiment of the present invention；
Fig. 2-1 is the schematic diagram that BFD control message Diag field is extended in the embodiment of the present invention；
Fig. 2-2 is the schematic diagram that BFD control message MTU TLV is extended in the embodiment of the present invention；
Fig. 3 is a kind of flow diagram for sending message method of the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of the network equipment of the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the another kind network equipment of the embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of determining tunnel MTU system of the embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of the network equipment of the embodiment of the present invention；
Fig. 8 is the structural schematic diagram of the another kind network equipment of the embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this
Inventive embodiments are described in further detail.Obviously, described embodiments are some of the embodiments of the present invention, rather than complete
The embodiment in portion.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, shall fall within the protection scope of the present invention.
Ingress node, node, intermediate node mentioned in present specification and any one in Egress node can be with
Be router, interchanger or have the similar functions network equipment.
Before introducing technical solution of the embodiment of the present invention, first the concrete application scene of the embodiment of the present invention is explained
Explanation.
In a communication network, when data message crossing-river tunnel transmits, because the size of data message is greater than the tunnel
The interface mtu of access device and cause to carry out fragment to the message received greater than interface mtu in the tunnel portal position, such as
Fruit first carries out the first time fragment based on IP packet to the data message (such as IP packet) greater than the interface mtu received, so
The fragment is encapsulated into upper tunnel packet head (the gre tunneling head of such as gre tunneling) again afterwards and forms GRE message to tunnel exit direction
It sends；If the interface mtu of an intermediate equipment on the tunnel is less than the interface mtu of tunnel portal equipment, it is also necessary to
Second of fragment based on gre tunneling message is continued to the GRE message, so carrying out releasing GRE tunnel in tunnel exit
Road encapsulation and when to the GRE Packet reassembling, due to second of the fragment carried out to the GRE message and to the data message
Level locating for the first time fragment of progress is different, that is, the first time fragment carried out to the data message is reported based on IP
Literary head is based on gre tunneling message to second of fragment that the GRE message carries out, will lead to tunnel exit and carry out fragment weight
The problem of group failure.
It is worth noting that the tunnel can be three layer tunnel.For example, the tunnel can be generic route encapsulation
The tunnel (Generic Routing Encapsulation, GRE) or Internet Protocol Security (Internet Protocol
Security, IPSec) tunnel.The tunnel is also possible to two layer tunnel.For example, the tunnel can be multiprotocol label friendship
Change the tunnel (Multi-Protocol Label Switching, MPLS) or the Resource Reservation Protocol based on Traffic Engineering extensions
The tunnel (Resource Reservation Protocol-Traffic Engineering, RSVP-TE) or point-to-point tunnel
The agreement tunnel (Point to Point Tunneling Protocol, PPTP) or Level 2 Tunnel Protocol (Layer Two
Tunneling Protocol, L2TP) tunnel.
Ingress node, intermediate node and Egress node mentioned in the embodiment of the present invention can be router, interchanger
Or there is the similar functions network equipment.
Embodiment one,
Referring to Fig. 1, show the flow diagram that the embodiment of the present invention determines tunnel MTU method, this method apply by
On Ingress node to the tunnel of Egress node.This method comprises:
101, receiving node of the Ingress node on the tunnel sends the first extension two-way converting and detects BFD
(Bidirectional Forwarding Detection) controls message, and the first extension BFD control message includes MTU mark
Will position, the MTU flag bit are used to indicate the receiving node and return to the receiving node in the tunnel to the Ingress node
The MTU value of interface on road, the receiving node be the tunnel on other than the Ingress node, pass through all sections
Point.
Specifically, as shown in Fig. 2-1, the MTU flag bit can use the diagnosis code Diag word in extension BFD control message
Section identifies.Specifically, the MTU flag bit, Ke Yiyou are identified with the diagnosis code Diag field in extension BFD control message
Two ways:
Mode one: the MTU flag bit is identified with the reserved value of the Diag field.
The diagnosis code Diag field definition of the BFD control message format is that local system is directed to BFD session status
The reason of middle the last variation, the diagnosis code value that ietf standard RFC5880 is defined includes:
0 --- without diagnosis code；
1 --- control detection time time-out；
2 --- the failure of Echo function；
3 --- neighbours' signaling shows session down；
4 --- Forwarding plane resets；
5 --- path down；
6 --- tandem paths down；
7 --- management down；
8 --- differential concatenation path down；
9-31 --- reserved coding.
Select reserved value (such as 9) as MTU marker from the diagnosis code reserved value (9-31) is middle.
Mode two: the MTU flag bit described in the bit identification in the Diag field, RFC5880 is defined to be encoded with 4
A bit just indicates to diagnose code enough, and 1 bit in the diagnosis code domain of BFD control message can be used as MTU flag bit,
The Diag field as described in Fig. 2-1 occupies the 3rd~7 bit, for example, can be used as MTU flag bit for the 3rd or the 7th.
Further, optionally, the Ingress node sends the specific of the first extension BFD control message to the receiving node
Mode may is that the Ingress node is controlled in the tunnel packet of message by setting carrying the first extension BFD
Life span ttl value, to complete the specified receiving node sent the first extension BFD control message on the tunnel
On.
For example, node A is entrance section from the tunnel that node A successively passes through that node B and node C reaches node D
Point, node B and node C are intermediate node, and node D is Egress node.When node A sends the first extension BFD control to node B
When message processed, 1 is set by the life span ttl value in the tunnel packet；Expand when node A sends described first to node C
When opening up BFD control message, 2 are set by the life span ttl value in the tunnel packet；When node A is to described in node D transmission
When the first extension BFD control message, 3 are set by the life span ttl value in the tunnel packet；Optionally, when node A to
When node D sends the first extension BFD control message, it can also be not provided with ttl value (ttl value is defaulted as 255), only by
Lookup forwarding is carried out according to the destination address in tunnel, the first extension BFD control message can also be made to reach node D, node D
Control plane can to it is described first extension BFD control message carry out dissection process.
Further, specifically, the method that ttl value is set in the tunnel packet is illustrated, for example, if the tunnel
Road is gre tunneling, then ttl value, the transmission head are arranged in the transmission head of GRE heading outer layer (Delivery Header)
It is IP packet head, setting TTL is exactly the ttl field being arranged in IP packet head.If the tunnel is the tunnel MPLS, it is arranged
TTL is exactly the ttl field being arranged in MPLS heading.
102, the Ingress node receives the second extension BFD control message that the receiving node returns, and described second expands
Interface mtu value of the receiving node on the tunnel is carried in exhibition BFD control message.
Specifically, the second extension BFD control message specifically includes: MTU type lengths values TLV, described for carrying
Interface mtu value of the receiving node on the tunnel.
Specifically, such as Fig. 2-2, message can be controlled by extension BFD, increases the MTU TLV newly as the second extension
BFD controls message.The MTU TLV is specifically included: type Type, length Length and value Value, described in the Type instruction
The type of Value is MTU, and the Length indicates the length of the MTU TLV, and the Value is the receiving node in institute
State the interface mtu value on tunnel；Optionally, in addition, for the definition of Length, it can also be used to the length for indicating the Value
Degree.
It is worth noting that number of bits shared by Type, Length and Value field is only one and shows in Fig. 2-2
Meaning, limitation and this.
Optionally, the MTU TLV is located at the tail portion of the BFD control message of the extension.
Optionally, interface mtu of the receiving node on the tunnel is carried in the second extension BFD control message
Value, can be with are as follows:
If the receiving node is the Egress node, the interface mtu value on the receiving node is the tunnel
In the MTU value of incoming interface of the Egress node on the tunnel；And/or
If the receiving node is the Ingress node on the tunnel to the intermediate node between the Egress node,
Then the interface mtu value on the receiving node is the incoming interface MTU value and outgoing interface MTU that the tunnel passes through the receiving node
Minimum value in value.
103, interface mtu of the receiving node that the Ingress node is returned from the receiving node on the tunnel
Value and the tunnel select the smallest MTU value, as the tunnel MTU value in the interface mtu value on the Ingress node.
Optionally, if the tunnel only has the Ingress node and the Egress node without intermediate node, institute
The interface mtu value that Ingress node receives the Egress node is stated, obtains the tunnel in itself outgoing interface MTU value, from above-mentioned
In total interface MTU value, a minimum value is chosen as tunnel MTU value.
Optionally, if the tunnel is in addition to the Ingress node and the Egress node, there are also intermediate nodes, then described
Ingress node receives the interface mtu value of all intermediate nodes and the interface mtu value of Egress node, obtains the institute that the tunnel passes through
The outgoing interface MTU value for stating Ingress node, interface mtu value, the interface mtu value of Egress node, Yi Jisuo from all intermediate nodes
Ingress node is stated in the MTU value of the outgoing interface on the tunnel, chooses a minimum value as tunnel MTU value.
It is worth noting that first in the embodiment of the present invention extends " first " and the second extension BFD report in BFD message
" second " in text is used only for showing to distinguish two messages, and the format of the two extension BFD messages is identical, is all based on existing
BFD message, extend Diag field uses and has increased newly MTU TLV.
It is worth noting that illustrating only the tunnel in unidirectional tunnel (such as the direction from node A to node D) in the present embodiment
MTU value method of determination, can also by the BFD of extension control message, carry out the tunnel MTU value of reverse tunnel determination (for example,
The direction from node D to node A), it is, the BFD by extension controls message, simultaneously or bidirectional tunnel can be completed at the same time
Tunnel MTU value determination.
The determination tunnel MTU method that the embodiment of the present invention one provides, passes through the Ingress node connecing on the tunnel
It receives node and sends the first extension BFD control message, the second extension BFD control message that the receiving node returns is received, from institute
State receiving node return the receiving node on the tunnel interface mtu value and the tunnel on the Ingress node
Interface mtu value in, select the smallest MTU value, facilitate as the tunnel MTU value to be accurately determined tunnel MTU
It reduces fragment number and avoids secondary fragment bring reconstructing failure problem.
Embodiment two,
Referring to Fig. 3, show the flow diagram that the embodiment of the present invention sends MTU method, apply by Ingress node to
Egress node is formed by tunnel.Specific method includes:
301, receiving node receives the first extension two-way converting detection BFD control message that the Ingress node is sent, institute
State the first extension BFD control message include MTU flag bit, the MTU flag bit be used to indicate the receiving node to it is described enter
Mouth node returns to interface mtu value of the receiving node on the tunnel；
The MTU flag bit in the present embodiment, please refers to and describes accordingly in embodiment one, details are not described herein.
Optionally, in the tunnel packet of the receiving node parsing carrying the first extension BFD control message
Life span ttl value sends the receiving node on the tunnel to the Ingress node if the ttl value is equal to 1
Interface mtu value.Specifically, if the ttl value is equal to 1, the first extension BFD is controlled and is connect described in message up sending
Receive the control plane treatment of node.
302, the receiving node obtains interface mtu value of the receiving node on the tunnel；
Optionally, interface mtu of the receiving node on the tunnel is carried in the second extension BFD control message
Value, can be with are as follows:
If the receiving node is the Egress node, the interface mtu value on the receiving node is the tunnel
In the MTU value of incoming interface of the Egress node on the tunnel；And/or
If the receiving node is the Ingress node on the tunnel to the intermediate node between the Egress node,
Then the interface mtu value on the receiving node is the incoming interface MTU value and outgoing interface MTU that the tunnel passes through the receiving node
Minimum value in value.
303, the receiving node returns to the second extension BFD to Ingress node and controls message, the second extension BFD control
Interface mtu value of the receiving node on the tunnel is carried in message.
Specifically, the second extension BFD control message specifically includes: MTU type lengths values TLV, described for carrying
Interface mtu value of the receiving node on the tunnel.
The MTU TLV in the present embodiment, and to " first " and the second extension BFD in the first extension BFD message
" second " in message explains, please refers to and describes accordingly in embodiment one, details are not described herein.
Transmission MTU method provided by Embodiment 2 of the present invention receives that the Ingress node is sent by receiving node
One extension two-way converting detection BFD controls message, obtains interface mtu value of the receiving node on the tunnel, will carry
Second extension BFD control message of the interface mtu value returns to the Ingress node, thus by described in the receiving node
Interface mtu value is sent to the Ingress node.The embodiment of the present invention helps to be accurately determined tunnel MTU, helps to reduce and divide
Piece number and avoid secondary fragment bring reconstructing failure problem.
Embodiment three,
Referring to fig. 4, the embodiment of the present invention provides a kind of network equipment 400, and the network equipment 400 is for determining tunnel maximum
Transmission unit MTU value, the network equipment 400 are applied on the tunnel by Ingress node to Egress node.The network equipment 400 packet
It includes:
Transmission unit 401 sends the first extension two-way converting detection BFD control for the receiving node on the tunnel
Message, it is described first extension BFD control message include MTU flag bit, the MTU flag bit be used to indicate the receiving node to
The Ingress node returns to the MTU value of interface of the receiving node on the tunnel, and the receiving node is the tunnel
On other than the Ingress node, pass through all nodes；
Receiving unit 402, the second extension BFD control message returned for receiving the receiving node, described second expands
Interface mtu value of the receiving node on the tunnel is carried in exhibition BFD control message；
Determination unit 403, interface mtu of the receiving node on the tunnel for being returned from the receiving node
Value and the tunnel select the smallest MTU value, as the tunnel MTU value in the interface mtu value on the Ingress node.
Wherein, interface mtu value of the tunnel on the Ingress node can be going out for the Ingress node that the tunnel passes through
The interface mtu value of interface.
Optionally, the network equipment 400 can be located on the Ingress node.
Optionally, the network equipment 400 can be separately provided, and in this case, the network equipment 400 further includes
Acquiring unit, which is used to obtain the interface mtu value of outgoing interface of the Ingress node on the tunnel, described true
Interface mtu value and the tunnel of the receiving node that order member 403 is returned from the receiving node on the tunnel exist
In interface mtu value on the Ingress node, the smallest MTU value is selected, as the tunnel MTU value.
Optionally, the network equipment 400 further include:
TTL setting unit 404, for being arranged in the tunnel packet for carrying the first extension BFD control message
Life span ttl value, to complete the specified receiving node sent the first extension BFD control message on the tunnel
On.
It is worth noting that each functional unit for the network equipment 400 that the embodiment of the present invention three provides, is based on real
The specific implementation for applying the method for the offer of example one, the definition of term and solves the problems, such as to be consistent with embodiment one, herein no longer
It repeats.
The network equipment 400 that the embodiment of the present invention three provides, passes through receiving node of the transmission unit 401 on the tunnel
It sends the first extension two-way converting detection BFD and controls message；Second that the receiving node returns is received by receiving unit 402
It extends BFD and controls message；The receiving node returned by determination unit 403 from the receiving node is on the tunnel
Interface mtu value and the tunnel select the smallest MTU value, as the tunnel in the interface mtu value on the Ingress node
MTU value.To be accurately determined tunnel MTU, helps to reduce fragment number and secondary fragment bring reconstructing failure is avoided to ask
Topic.
Example IV,
Referring to Fig. 5, the embodiment of the present invention provides a kind of network equipment 500, passes for sending the maximum of the node on tunnel
Defeated unit MTU value, the network equipment 500 are applied on the tunnel by Ingress node to Egress node.The network equipment 500 packet
It includes:
Receiving unit 501, the first extension two-way converting detection BFD control report sent for receiving the Ingress node
Text, it is described first extension BFD control message include MTU flag bit, the MTU flag bit be used to indicate receiving node to it is described enter
Mouth node returns to interface mtu value of the receiving node on the tunnel；
Acquiring unit 502, for obtaining interface mtu value of the receiving node on the tunnel；
Transmission unit 503 controls message, the second extension BFD control for returning to the second extension BFD to Ingress node
Interface mtu value of the receiving node on the tunnel is carried in message.
Optionally, the network equipment 500 can be located on the receiving device or be separately provided.
The network equipment 500 that the embodiment of the present invention four provides receives the Ingress node by the receiving unit 501 and sends out
The the first extension two-way converting detection BFD come controls message, obtains the receiving node by the acquiring unit 502 and exists
Interface mtu value on the tunnel returns to the second extension BFD to Ingress node by the transmission unit 503 and controls message, from
And the interface mtu value of the receiving node is sent to the Ingress node.The embodiment of the present invention helps to be accurately determined tunnel
Road MTU helps to reduce fragment number and secondary fragment bring reconstructing failure problem.
Embodiment five,
Referring to Fig. 6, one embodiment of the present of invention provides a kind of system 600 of determining tunnel maximum transmission unit MTU value,
It applies on the tunnel by Ingress node to Egress node, system 600 includes: first network equipment 601 and second network equipment
602；
The first network equipment 601, comprising:
The network equipment 400 described in embodiment three；
Second network equipment 602, comprising:
The network equipment 500 described in example IV.
It is worth noting that the first network equipment that the embodiment of the present invention five provides and second network equipment
Each functional unit is the group of three to four network equipment of specific implementation and embodiment of the method provided based on embodiment one to two
It closes, the definition of term and solves the problems, such as to be consistent with embodiment one to four, details are not described herein again.
The system that the embodiment of the present invention five provides, the net of the network equipment described by embodiment three and example IV description
The combination of network equipment controls message by extension BFD, the interface mtu value of the network equipment each on tunnel is collected, selection takes
Being worth the smallest interface mtu value is tunnel MTU, to be accurately determined tunnel MTU, helps to reduce fragment number and secondary fragment
Bring reconstructing failure problem.
Embodiment six,
Referring to FIG. 7, one embodiment of the present of invention provides a kind of network equipment 700, which can be micro-
Handle computer.Such as: the network equipment 700 can be general purpose computer, customization machine, mobile phone terminal or purl machine etc. just
Take one of equipment.The network equipment 700 includes: processor 704, memory 706, communication interface 702 and bus 708.Place
Reason device 704, memory 706 and communication interface 702 connect by bus 708 and complete mutual communication.
The bus 708 can be industry standard architecture (Industry Standard Architecture, abbreviation
For ISA) bus or external equipment interconnection (Peripheral Component, referred to as PCI) bus or extension industrial standard body
Architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc..The bus can be with
Including one of address bus, data/address bus, control bus or a variety of.For convenient for indicating, only with a thick line table in Fig. 7
Show, it is not intended that an only bus or a type of bus,
For memory 706 for storing executable program code, which includes computer operation instruction.The program generation
Code is for completing step 101~103 of embodiment three.Memory 706 may include high-speed RAM (Ramdom Access
Memory) memory.Optionally, memory 706 can also include nonvolatile memory (non-volatile memory).
Such as memory 706 may include magnetic disk storage.
Processor 704 can be central processing unit (Central Processing Unit, referred to as CPU), or processing
Device 704 can be specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC),
Or processor 704 can be arranged to implement one or more integrated circuits of the embodiment of the present invention.
Communication interface 702, for executing receiving node in embodiment three on the tunnel, to send the first extension two-way
Forwarding detection BFD control message and the operation for receiving the second extension BFD control message that the receiving node returns.
Processor 704, for reading the instruction stored in memory 706, thereby executing in embodiment three from the reception
The receiving node that node returns is in the interface of interface mtu value and the tunnel on the Ingress node on the tunnel
In MTU value, the smallest MTU value is selected, the operation as the tunnel MTU value.
Wherein, interface mtu value of the tunnel on the Ingress node can be the entrance that the tunnel passes through
The interface mtu value of the outgoing interface of node.
Optionally, the network equipment can be located on the Ingress node.
Optionally, the network equipment can be separately provided, and in this case, the network equipment is also used to obtain institute
The interface mtu value for stating outgoing interface of the Ingress node on the tunnel, the receiving node returned from the receiving node exist
Interface mtu value and the tunnel on the tunnel select the smallest MTU value in the interface mtu value on the Ingress node,
As the tunnel MTU value.
It is double to send the first extension by the receiving node on the tunnel for the network equipment that the embodiment of the present invention six provides
Message is controlled to forwarding detection BFD, the second extension BFD control message that the receiving node returns is received, is saved from the reception
The receiving node that point returns is in the interface of interface mtu value and the tunnel on the Ingress node on the tunnel
In MTU value, the smallest MTU value is selected, as the tunnel MTU value.To be accurately determined tunnel MTU, helps to reduce and divide
Piece number and avoid secondary fragment bring reconstructing failure problem.
Embodiment seven,
Referring to FIG. 8, one embodiment of the present of invention provides a kind of network equipment 800, which can be micro-
Handle computer.Such as: the network equipment 700 can be general purpose computer, customization machine, mobile phone terminal or purl machine etc. just
Take one of equipment.The network equipment 800 includes: processor 804, memory 806, communication interface 802 and bus 808.Place
Reason device 804, memory 806 and communication interface 802 connect by bus 808 and complete mutual communication.
The bus 808 can be industry standard architecture (Industry Standard Architecture, abbreviation
For ISA) bus or external equipment interconnection (Peripheral Component, referred to as PCI) bus or extension industrial standard body
Architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc..The bus can be with
It is divided into one of address bus, data/address bus, control bus or a variety of.For convenient for indicating, only with a thick line table in Fig. 8
Show, it is not intended that an only bus or a type of bus,
For memory 806 for storing executable program code, which includes computer operation instruction.The program generation
Code is for completing step 301~303 of embodiment three.Memory 806 may include high-speed RAM (Ramdom Access
Memory) memory.Optionally, memory 806 can also further include nonvolatile memory (non-volatile
memory).Such as memory 806 may include magnetic disk storage.
Processor 804 can be a central processing unit (Central Processing Unit, referred to as CPU), or
Be processor 804 can with specific integrated circuit (Application Specific Integrated Circuit, referred to as
ASIC) or processor 804 can be arranged to implement one or more integrated circuits of the embodiment of the present invention.
Communication interface 802, the first two-way turn of extension that the reception Ingress node for executing in example IV is sent
Hair detection BFD control message and the operation that the second extension BFD control message is returned to Ingress node.
Processor 804 connects for reading the instruction stored in memory 806 thereby executing described in acquisition in example IV
Receive the operation of interface mtu value of the node on the tunnel.
Optionally, the network equipment can be located on the receiving device or be separately provided.
The network equipment that the embodiment of the present invention seven provides, first two-way turn of the extension sent by receiving Ingress node
Hair detection BFD controls message, obtains interface mtu value of the receiving node on the tunnel, returns to second to Ingress node
It extends BFD and controls message, so that the interface mtu value of the receiving node is sent to the Ingress node.The embodiment of the present invention
Help to be accurately determined tunnel MTU, helps to reduce fragment number and secondary fragment bring reconstructing failure problem.
The present invention program can describe in the general context of computer-executable instructions executed by a computer, such as
Program unit.Generally, program unit include routines performing specific tasks or implementing specific abstract data types, it is program, right
As, component, data structure etc..The present invention program can also be practiced in a distributed computing environment, in these distributed computings
In environment, by executing task by the connected remote processing devices of communication network.In a distributed computing environment, program
Unit can be located in the local and remote computer storage media including storage equipment.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and the highlights of each of the examples are differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to embodiment of the method
Part explanation.The apparatus embodiments described above are merely exemplary, wherein described be used as separate part description
Unit may or may not be physically separated, component shown as a unit may or may not be
Physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to the actual needs
Some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying
In the case where creative work, it can understand and implement.
The embodiment of the present invention has been described in detail above, and specific embodiment used herein carries out the present invention
It illustrates, the above description of the embodiments is only used to help understand the method and apparatus of the present invention；Meanwhile for the one of this field
As technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the contents of this specification are not to be construed as limiting the invention.
Claims (11)
1. a kind of method of determining tunnel maximum transmission unit MTU value, which is characterized in that the method is applied by Ingress node
Onto the tunnel of Egress node, which comprises
Receiving node of the Ingress node on the tunnel sends the first extension two-way converting detection BFD and controls message, institute
State the first extension BFD control message include MTU flag bit, the MTU flag bit be used to indicate the receiving node to it is described enter
Mouthful node returns to the MTU value of interface of the receiving node on the tunnel, the receiving node be on the tunnel in addition to
Other than the Ingress node, pass through all nodes；
The Ingress node receives the second extension BFD control message that the receiving node returns, the second extension BFD control
Interface mtu value of the receiving node on the tunnel is carried in message；
Interface mtu value of the receiving node that the Ingress node is returned from the receiving node on the tunnel and described
Tunnel selects the smallest MTU value in the interface mtu value on the Ingress node, as the tunnel MTU value；
If the receiving node is the Egress node, the interface mtu value on the receiving node is the tunnel in institute
State the MTU value of incoming interface of the Egress node on the tunnel；And/or
If the receiving node is the Ingress node on the tunnel to the intermediate node between the Egress node, institute
Stating the interface mtu value on receiving node is that the tunnel passes through in the incoming interface MTU value and outgoing interface MTU value of the receiving node
Minimum value；
The Ingress node sends the first extension BFD to receiving node and controls message, comprising: the Ingress node is held by setting
The life span ttl value in the tunnel packet of the first extension BFD control message is carried, to complete to extend described first
BFD control message is sent on the specified receiving node on the tunnel.
2. the method according to claim 1, wherein the MTU flag bit the first extension BFD control report
The reserved value mark of a bit identification or the Diag field in the diagnosis code Diag field of text.
3. method according to claim 1 or 2, which is characterized in that the second extension BFD controls message and includes:
MTU type lengths values TLV, for carrying interface mtu value of the receiving node on the tunnel.
4. according to the method described in claim 3, it is characterized in that, the MTU TLV is specifically included: type Type, length
Length and value Value, the Type indicate that the type of the Value is MTU, and the Length indicates the MTU TLV's
Length, the Value are interface mtu value of the receiving node on the tunnel；
The MTU TLV is located at the tail portion of the first extension BFD control message.
5. a kind of method for sending maximum transmission unit MTU, which is characterized in that the method is applied by Ingress node to outlet
On the tunnel of node, which comprises
Receiving node receives the first extension two-way converting detection BFD control message that the Ingress node is sent, and described first expands
Opening up BFD control message includes MTU flag bit, and the MTU flag bit is used to indicate the receiving node and returns to the Ingress node
Return interface mtu value of the receiving node on the tunnel；
The receiving node obtains interface mtu value of the receiving node on the tunnel；
The receiving node returns to the second extension BFD to Ingress node and controls message, takes in the second extension BFD control message
Interface mtu value with the receiving node on the tunnel；
If the receiving node is the Egress node, the interface mtu value on the receiving node is the tunnel in institute
State the MTU value of incoming interface of the Egress node on the tunnel；And/or
If the receiving node is the Ingress node on the tunnel to the intermediate node between the Egress node, institute
Stating the interface mtu value on receiving node is that the tunnel passes through in the incoming interface MTU value and outgoing interface MTU value of the receiving node
Minimum value；
After the first extension BFD control message that the receiving node receives that Ingress node is sent, further includes: the reception section
Life span ttl value in the tunnel packet of point parsing carrying the first extension BFD control message, if parsed
Ttl value is equal to 1, then sends interface mtu value of the receiving node on the tunnel to the Ingress node.
6. according to the method described in claim 5, it is characterized in that, the MTU flag bit the first extension BFD control report
The reserved value mark of a bit identification or the Diag field in the diagnosis code Diag field of text.
7. method according to claim 5 or 6, which is characterized in that the second extension BFD control message specifically includes:
MTU type lengths values TLV, for carrying interface mtu value of the receiving node on the tunnel.
8. the method according to the description of claim 7 is characterized in that the MTU TLV is specifically included: type Type, length
Length and value Value, the Type indicate that the type of the Value is MTU, and the Length indicates the MTU TLV's
Length, the Value are interface mtu value of the receiving node on the tunnel；
The MTU TLV is located at the tail portion of the first extension BFD control message.
9. a kind of network equipment, for determining tunnel maximum transmission unit MTU value, which is characterized in that the network equipment application
On the tunnel by Ingress node to Egress node, which includes:
Transmission unit sends the first extension two-way converting detection BFD for the receiving node on the tunnel and controls message, institute
State the first extension BFD control message include MTU flag bit, the MTU flag bit be used to indicate the receiving node to it is described enter
Mouthful node returns to the MTU value of interface of the receiving node on the tunnel, the receiving node be on the tunnel in addition to
Other than the Ingress node, pass through all nodes；
Receiving unit, the second extension BFD control message returned for receiving the receiving node, the second extension BFD control
Interface mtu value of the receiving node on the tunnel is carried in message processed；
Determination unit, interface mtu value and institute of the receiving node on the tunnel for being returned from the receiving node
Tunnel is stated in the interface mtu value on the Ingress node, selects the smallest MTU value, as the tunnel MTU value；
TTL setting unit, the life span for being arranged in the tunnel packet for carrying the first extension BFD control message
Ttl value, to complete on the specified receiving node for sending the first extension BFD control message on the tunnel.
10. a kind of network equipment, for sending tunnel maximum transmission unit MTU value, which is characterized in that the network equipment application
On the tunnel by Ingress node to Egress node, the network equipment includes:
Receiving unit, for receiving the first extension two-way converting detection BFD control message that the Ingress node sends, described the
One extension BFD control message includes MTU flag bit, and the MTU flag bit is used to indicate the receiving node to the entrance section
Point returns to interface mtu value of the receiving node on the tunnel；
Acquiring unit, for obtaining interface mtu value of the receiving node on the tunnel；
Transmission unit controls message for returning to the second extension BFD to Ingress node, and described second extends in BFD control message
Carry interface mtu value of the receiving node on the tunnel；
TTL resolution unit, the tunnel packet for receiving node parsing carrying the first extension BFD control message
In life span ttl value send the receiving node described to the Ingress node if parsing ttl value equal to 1
Interface mtu value on tunnel.
11. a kind of system for determining tunnel maximum transmission unit MTU value characterized by comprising first network equipment and
Second network equipment, the first network equipment are the network equipment as claimed in claim 9；Second network equipment is right
It is required that the network equipment described in 10.
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| CN201410525848.6A CN105530193B (en) | 2014-09-30 | 2014-09-30 | Determine method, the network equipment and the system of tunnel maximum transmission unit |
| PCT/CN2015/090786 WO2016050177A1 (en) | 2014-09-30 | 2015-09-25 | Pmtu determination method, network device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410525848.6A CN105530193B (en) | 2014-09-30 | 2014-09-30 | Determine method, the network equipment and the system of tunnel maximum transmission unit |
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| US10608947B2 (en) * | 2018-02-26 | 2020-03-31 | Qualcomm Incorporated | Per-flow jumbo MTU in NR systems |
| CN110191066B (en) * | 2019-06-14 | 2022-05-20 | 迈普通信技术股份有限公司 | Method, equipment and system for determining maximum transmission unit (PMTU) |
| CN110351207B (en) * | 2019-07-19 | 2022-05-17 | 迈普通信技术股份有限公司 | Maximum transmission unit determining method and device, electronic equipment and readable storage medium |
| CN113162866B (en) * | 2020-01-22 | 2023-08-01 | ***通信有限公司研究院 | Message transmission method, communication equipment and medium |
| CN114095479B (en) * | 2020-07-29 | 2024-04-30 | 武汉神州数码云科网络技术有限公司 | Processing method of IGMPv3/MLDv2 member report message |
| CN112565054A (en) * | 2020-12-15 | 2021-03-26 | 安徽皖通邮电股份有限公司 | Method for determining Maximum Transmission Unit (MTU) value of tunnel by utilizing CFM (computational fluid dynamics) |
| CN112688879B (en) * | 2020-12-29 | 2023-08-22 | 联想未来通信科技(重庆)有限公司 | Data limit value determining method and device |
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| CN105530193A (en) | 2016-04-27 |
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