CN109067652A - The method and device of segment identification expense is saved in a kind of IPv6 Segment routing - Google Patents
The method and device of segment identification expense is saved in a kind of IPv6 Segment routing Download PDFInfo
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- CN109067652A CN109067652A CN201811114760.XA CN201811114760A CN109067652A CN 109067652 A CN109067652 A CN 109067652A CN 201811114760 A CN201811114760 A CN 201811114760A CN 109067652 A CN109067652 A CN 109067652A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/34—Source routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/659—Internet protocol version 6 [IPv6] addresses
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Abstract
Present invention discloses the method and devices that segment identification expense is saved in a kind of IPv6 Segment routing, by being improved to IPv6 Segment routing extension header, segment identification is designed using variable length, when intermediate node searches IPv6 routing table, passes through the segment identification of the splicing composition IPv6 format of prefix.The lower deployment cost of IPv6 Segment routing to greatly reduce the length of IPv6 segment extension head, can be reduced according to the scale selection segment identification length appropriate of network in this way.
Description
Technical field
The present invention relates to a kind of Segment routing technologies, more particularly, to saving segment identification expense in a kind of IPv6 Segment routing
Method and device.
Background technique
Segment routing (Segment Routing, abbreviation SR) refers to that network is divided into several route segments, and message is in network
When middle forwarding, the optimal section of set passed through by source node selection the section set selected, successively carries the Segment routing in message
In stack, intermediate node selects corresponding path to carry out message forwarding by the segment identification in Segment routing stack.
As shown in Figure 1, if message source device A to whole equipment F, the path of selection can by above-mentioned routing segment identification come
Description, red path can be expressed as { route segment 1, route segment 4, route segment 6, route segment 8 }, and source device A selection is being reported behind path
Segment routing stack is inserted into text, { route segment 1, route segment 4, route segment 6, route segment 8 }, equipment A is according to the mark handle of route segment 1
Message is forwarded to B, and message is forwarded to D according to the mark of route segment 4 by equipment B, and equipment D is identified according to route segment 6 turns message
It is dealt into E, equipment E is identified according to route segment 8 and message is forwarded to F, due to being F Segment routing terminal, so removal Segment routing
Stack restores former service message.
At present industry segment identification it is general there are two types of: 1. in MPLS/IPv4 network, using the label of MPLS come identification section, turns
Fermentation is forwarded using MPLS label.2. network in ipv 6, using Segment routing extension header, with the address IPv6 come identification section,
Forwarding surface is forwarded using the address IPv6.
Wherein, as shown in Fig. 2, the Segment routing extension header of IPv6 is by source Knots inserting, wherein field Segment Left
Identify the position of current segment identification stack.Segment Left=3, Segment List [0]=route segment 8, Segment are set
List [1]=route segment 6, Segment List [2]=route segment 4, Segment List [3]=route segment 1.Equipment A is used
The value route segment 1 of Segment List [3] carries out IPv6 lookup, obtains down being all the way equipment B, while Semgnet Left-
1；Equipment B Semgnet Left=2 takes the value route segment 4 of Segment List [2] to carry out IPv6 lookup, obtains lower one kind
Equipment is D, while Semgnet Left-1；Equipment D Semgnet Left=1 takes the value of Segment List [1] to route
Section 6 carries out IPv6 lookup, and obtaining a kind of lower equipment is E, while Semgnet Left-1；Equipment E Semgnet Left=
0, take the value route segment 8 of Segment List [0] to carry out IPv6 lookup, obtaining a kind of lower equipment is E, while Segment routing is expanded
Head is opened up to delete.
But each segment identification of the Segment routing extension header of IPv6 that aforesaid way defines passes through 128Bit length
The address Ipv6 composition, total length=128bits* sections of number+8+Option length of segment identification stack, this length it is longer, it is right
The requirement of exchange chip is higher, improves the lower deployment cost of Ipv6 Segment routing.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, provides and save segment identification in a kind of IPv6 Segment routing and open
The method and device of pin.
To achieve the above object, the following technical solutions are proposed by the present invention: saving segment identification in a kind of IPv6 Segment routing and opens
The method of pin, comprising:
S1 selects message to be forwarded to the set for the route segment that destination node is passed through by the source node of network, by the road
Segment routing stack representation is shared by the collection of section, and each route segment is indicated with IPv6 segment identification, and is arranged each IPv6 sections described
The Segment routing stack set of segmentation Routing expansion head is inserted into message by the length of mark；
S2, source node carry out IPv6 lookup according to the value of IPv6 segment identification corresponding in the Segment routing extension header, will
Message is forwarded to intermediate node；
S3, each intermediate node takes out the value of corresponding IPv6 segment identification in Segment routing stack, with the segmentation being locally configured
Route prefix carries out splicing and forms the complete address IPv6, and the IPv6 for carrying out the recovery of Segment routing extension header is searched, until will report
Text is forwarded to destination node；
S4, the destination node delete the Segment routing extension header in message.
Preferably, the Segment routing stack is identified using IPv6 Segment routing extension header, the IPv6 Segment routing extension
Head includes the first field, the second field of identification section identification length and the multiple IPv6 segment identifications of identification section home position.
Preferably, the source node or intermediate node are carried out according to the value of the corresponding IPv6 segment identification of first field
After IPv6 is searched, the first field is subtracted 1.
Preferably, be at least 16 by the length that each IPv6 segment identification in Segment routing stack is arranged in second field,
32,64 or 128bits.
It preferably,, will be complete after splicing while the IPv6 that intermediate node carries out the recovery of Segment routing extension header is searched in S3
The destination address on the whole address the IPv6 replacement head IPv6.
Present invention further teaches another technical solutions: the dress of segment identification expense is saved in a kind of IPv6 Segment routing
It sets, described device includes: that Segment routing extension header is inserted into module, source node, one or more intermediate nodes and destination node,
In,
Segment routing extension header is inserted into module, is passed through for selecting message to be forwarded to destination node by the source node of network
Route segment set, the collection of the route segment is shared into Segment routing stack representation, and each route segment IPv6 segment identification table
Show, and the Segment routing stack set of segmentation Routing expansion head is inserted into message by the length that each IPv6 segment identification is arranged
In；
Source node, for carrying out IPv6 lookup according to the value of IPv6 segment identification corresponding in the Segment routing extension header,
Forward the packet to intermediate node；
Each intermediate node, for taking out the value of corresponding IPv6 segment identification in Segment routing stack, with point being locally configured
Section route prefix carries out splicing and forms the complete address IPv6, and the IPv6 for carrying out the recovery of Segment routing extension header is searched, until will
Message is forwarded to destination node；
Destination node, for deleting the Segment routing extension header in message.
It preferably, will be complete after splicing while the IPv6 that the intermediate node carries out the recovery of Segment routing extension header is searched
The destination address on the whole address the IPv6 replacement head IPv6.
The beneficial effects of the present invention are: segment identification uses variable length by improving to IPv6 Segment routing extension header
Design passes through the segment identification of the splicing composition IPv6 format of prefix when intermediate node searches IPv6 routing table.It in this way can root
According to the scale selection of network segment identification length appropriate, to greatly reduce the length of IPv6 segment extension head, IPv6 points are reduced
The lower deployment cost of section routing.
Detailed description of the invention
Fig. 1 is the schematic illustration that message forwards in a network；
Fig. 2 is the Segment routing extension header schematic diagram of existing IPv6；
Fig. 3 is the Segment routing extension header schematic diagram of IPv6 of the present invention；
Fig. 4 is the flow diagram of the method for the present invention；
Fig. 5 is apparatus of the present invention block diagram.
Specific embodiment
Below in conjunction with attached drawing of the invention, clear, complete description is carried out to the technical solution of the embodiment of the present invention.
In conjunction with shown in Fig. 3 and Fig. 4, the side of segment identification expense is saved in a kind of disclosed IPv6 Segment routing
Method, comprising:
S1 selects message to be forwarded to the set for the route segment that destination node is passed through by the source node of network, by route segment
Collection share Segment routing stack representation, and each route segment is indicated with IPv6 segment identification, and the length of each IPv6 segment identification is arranged
Degree, Segment routing stack set of segmentation Routing expansion head is inserted into message.
Specifically, be illustrated taking the example shown in figure 1, source node A here choose destination node F passed through it is optimal
The set of route segment are as follows: the collection of these route segments is shared Segment routing stack by route segment 1, route segment 4, route segment 6, route segment 8
It indicates.In the present embodiment, as shown in connection with fig. 3, Segment routing stack is indicated using a kind of new IPv6 Segment routing extension header, tool
Body includes prefix, the first field, the second field and multiple IPv6 segment identifications, wherein prefix includes the Next on the head in Fig. 3
The fields such as Header, Hdr Ext Len, Last Entry, Flags, the first field is Segment Left field, for identifying
The position of current IPv6 segment identification, in the example, Segment Left=3 is provided with:
Segment List [0]=route segment 8；
Segment List [1]=route segment 6；
Segment List [2]=route segment 4；
Segment List [3]=route segment 1.
Second field is Segment ID LengthType field, i.e., increases in former Segment routing extension header
Segment ID LengthType field, for identifying the length of each IPv6 segment identification.In the present embodiment, setting:
Segment ID LengthType=0:128bits segment identification；
Segment ID LengthType=1:64bits segment identification；
Segment ID LengthType=2:32bits segment identification；
Segment ID LengthType=3:16bits segment identification；
Segment ID LengthType=other, other coding modes of later period.
That is, if Segment ID LengthType=3:16bits segment identification, each IPv6 in Segment routing stack
The length of segment identification is 16bits, it may be assumed that
Segment List [0]=route segment 8 [16bits]；
Segment List [1]=route segment 6 [16bits]；
Segment List [2]=route segment 4 [16bits]；
Segment List [3]=route segment 1 [16bits].
Above-mentioned Segment routing stack is formed Segment routing extension header shown in Fig. 3 by source node, that is, node A here, is inserted
Enter into message.
S2, source node carries out IPv6 lookup according to the value of IPv6 segment identification corresponding in Segment routing extension header, by message
It is forwarded to intermediate node.
Specifically, it is still illustrated taking the example shown in figure 1, source node A is according to the corresponding routing of Segment List [3]
Section 1 is forwarded, and forwards the packet to intermediate node B, while Semgnet Left-1.
S3, each intermediate node takes out the value of corresponding IPv6 segment identification in Segment routing stack, with the segmentation being locally configured
Route prefix carries out splicing and forms the complete address IPv6, and the IPv6 for carrying out the recovery of Segment routing extension header is searched, until will report
Text is forwarded to destination node.
Specifically, it is illustrated taking the example shown in figure 1, after intermediate node B receives message, takes out Segment List
[2] value of the corresponding IPv6 segment identification of value, such as the segment identification value of the 16bits of setting, (are generally matched by software with being locally configured
Set) Segment routing prefix carry out splicing and form the complete address IPv6, Segment routing prefix and above-mentioned IPv6 here is segmented
The prefix of Routing expansion head is identical.It is searched, will be reported with the IPv6 that the spliced address IPv6 carries out Segment routing extension header recovery
Text is forwarded to intermediate node D, and the address IPv6 is replaced to the destination address (DA) on the head IPv6.
Similar, the Message processing principle of intermediate node D, E and the Message processing principle of intermediate node B are identical, specifically,
Intermediate node D takes out the value of the corresponding IPv6 segment identification of value of Segment List [1], with the Segment routing prefix being locally configured
It carries out splicing and forms the complete address IPv6.It is looked into again with the IPv6 that the spliced address IPv6 carries out Segment routing extension header recovery
It looks for, forwards the packet to intermediate node E, while Semgnet Left-1, and the address IPv6 is replaced into the head IPv6
Destination address (DA).Intermediate node E takes out the value of the corresponding IPv6 segment identification of value of Segment List [0], matches with local
The Segment routing prefix set carries out splicing and forms the complete address IPv6, then carries out Segment routing expansion with the spliced address IPv6
It opens up the IPv6 that head restores to search, forwards the packet to destination node F, and the address IPv6 is replaced to the purpose on the head IPv6
Address (DA).
S4, the destination node delete the Segment routing extension header in message.
That is destination node F removes Segment routing extension header and restores former service message.
In this way, the variable length by segment identification designs, when intermediate node searches IPv6 routing table, pass through the splicing of prefix
Form the segment identification of IPv6 format.It in this way can be according to the scale selection segment identification length appropriate of network, to greatly reduce
The length of IPv6 segment extension head reduces the lower deployment cost of IPv6 Segment routing.Such as a road Segment routing extension header You10Ge
By section without Option, former scheme Segment routing extension header length=128bits*10+8=1288bits, the present invention program selection
When 16Bits length segment identification, Segment routing extension header length=16bits*10+8=168bits, Segment routing extension header is opened
Pin reduces 86%.However 16Bits can indicate 2^16=65535 route segment, can satisfy the use of most of network.
As shown in figure 5, the device of segment identification expense is saved in a kind of corresponding IPv6 Segment routing disclosed of the present invention, including
Segment routing extension header is inserted into module, source node, one or more intermediate nodes and destination node, wherein
Segment routing extension header is inserted into module, is passed through for selecting message to be forwarded to destination node by the source node of network
Route segment set, the collection of route segment is shared into Segment routing stack representation, and each route segment is indicated with IPv6 segment identification, and
The length of each IPv6 segment identification is set, Segment routing stack set of segmentation Routing expansion head is inserted into message；
Source node will be reported for carrying out IPv6 lookup according to the value of IPv6 segment identification corresponding in Segment routing extension header
Text is forwarded to intermediate node；
Each intermediate node, for taking out the value of corresponding IPv6 segment identification in Segment routing stack, with point being locally configured
Section route prefix carries out splicing and forms the complete address IPv6, and the IPv6 for carrying out the recovery of Segment routing extension header is searched, until will
Message is forwarded to destination node；
Destination node, for deleting the Segment routing extension header in message.
Wherein, the working principle of Segment routing extension header insertion module, source node, intermediate node and destination node can refer to
Specific descriptions in the above method, which is not described herein again.
Technology contents and technical characteristic of the invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention, therefore, the scope of the present invention in teachings of the present invention and announcement
It should be not limited to the revealed content of embodiment, and should include various without departing substantially from replacement and modification of the invention, and be this patent Shen
Please claim covered.
Claims (10)
1. saving the method for segment identification expense in a kind of IPv6 Segment routing, which is characterized in that the described method includes:
S1 selects message to be forwarded to the set for the route segment that destination node is passed through by the source node of network, by the route segment
Collection share Segment routing stack representation, and each route segment is indicated with IPv6 segment identification, and each IPv6 segment identification is arranged
Length the Segment routing stack set of segmentation Routing expansion head is inserted into message；
S2, source node carries out IPv6 lookup according to the value of IPv6 segment identification corresponding in the Segment routing extension header, by message
It is forwarded to intermediate node；
S3, each intermediate node takes out the value of corresponding IPv6 segment identification in Segment routing stack, with the Segment routing being locally configured
Prefix carries out splicing and forms the complete address IPv6, and the IPv6 for carrying out the recovery of Segment routing extension header is searched, until message is turned
It is dealt into destination node；
S4, the destination node delete the Segment routing extension header in message.
2. the method according to claim 1, wherein the Segment routing stack uses IPv6 Segment routing extension header
Mark, the IPv6 Segment routing extension header include the first field of identification section home position, identification section identification length second
Field and multiple IPv6 segment identifications.
3. according to the method described in claim 2, it is characterized in that, the source node or intermediate node are according to first field
After the value of corresponding IPv6 segment identification carries out IPv6 lookup, the first field is subtracted 1.
4. according to the method described in claim 2, it is characterized in that, being arranged by second field each in Segment routing stack
The length of IPv6 segment identification is at least 16,32,64 or 128bits.
5. the method according to claim 1, wherein intermediate node carries out the recovery of Segment routing extension header in S3
IPv6 search while, by the address IPv6 complete after splicing replace the head IPv6 destination address.
6. saving the device of segment identification expense in a kind of IPv6 Segment routing, which is characterized in that described device includes: Segment routing
Extension header is inserted into module, source node, one or more intermediate nodes and destination node, wherein
Segment routing extension header is inserted into module, for selecting message to be forwarded to the road that destination node is passed through by the source node of network
By the set of section, the collection of the route segment is shared into Segment routing stack representation, and each route segment is indicated with IPv6 segment identification, and
The length of each IPv6 segment identification is set, the Segment routing stack set of segmentation Routing expansion head is inserted into message；
Source node will be reported for carrying out IPv6 lookup according to the value of IPv6 segment identification corresponding in the Segment routing extension header
Text is forwarded to intermediate node；
Each intermediate node, for taking out the value of corresponding IPv6 segment identification in Segment routing stack, with the segmentation road being locally configured
Splicing is carried out by prefix and forms the complete address IPv6, the IPv6 for carrying out the recovery of Segment routing extension header is searched, until by message
It is forwarded to destination node；
Destination node, for deleting the Segment routing extension header in message.
7. the device that IPv6 according to claim 6 realizes Segment routing, which is characterized in that the Segment routing stack uses
IPv6 Segment routing extension header mark, the IPv6 Segment routing extension header include the first field of identification section home position, mark
Know the second field and multiple IPv6 segment identifications of segment identification length.
8. the device that IPv6 according to claim 7 realizes Segment routing, which is characterized in that the source node or middle node
After point carries out IPv6 lookup according to the value of the corresponding IPv6 segment identification of first field, the first field is subtracted 1.
9. the device that IPv6 according to claim 7 realizes Segment routing, which is characterized in that set by second field
The length for setting each IPv6 segment identification in Segment routing stack is at least 16,32,64 or 128bits.
10. the device that IPv6 according to claim 6 realizes Segment routing, which is characterized in that the intermediate node carries out
While the IPv6 that Segment routing extension header restores is searched, by the destination on the address IPv6 complete after the splicing replacement head IPv6
Location.
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| WO2022052201A1 (en) * | 2020-09-14 | 2022-03-17 | 网络通信与安全紫金山实验室 | Esp-based encapsulated message implementing source routing in overlay layer and transmission method therefor |
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| CN116366518A (en) * | 2021-12-27 | 2023-06-30 | 苏州盛科通信股份有限公司 | Method and device for editing route information |
| CN114900457A (en) * | 2022-05-20 | 2022-08-12 | 中电信数智科技有限公司 | Method and system for reducing SRv6 message header length |
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