CN107959627A - A kind of address transfer approach and the network equipment - Google Patents
A kind of address transfer approach and the network equipment Download PDFInfo
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- CN107959627A CN107959627A CN201610900284.9A CN201610900284A CN107959627A CN 107959627 A CN107959627 A CN 107959627A CN 201610900284 A CN201610900284 A CN 201610900284A CN 107959627 A CN107959627 A CN 107959627A
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- Prior art keywords
- network equipment
- area
- link state
- address entry
- address
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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
-
- 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
- H04L45/18—Loop-free operations
Abstract
This application provides a kind of address transfer approach and the network equipment.In a kind of address transfer approach, first network equipment obtains first up to IP address entry set according to the first Link State Database.Described first includes one up to IP address and area identification set up to each reachable IP address entry in IP address entry set.Described first does not include the mark of the second area up to any one in IP address entry set up to the area identification set of IP address entry.The first network equipment described first up to each area identification set up to IP address entry in IP address entry set in increase the mark of the first area, and be added in the second Link State Database.The scheme provided by the application, avoids introducing the reachable IP address entry of extraction into go back to the region arrived, and helps easily to solve the problems, such as that loop occurs in intErzone routing introducing.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of address transfer approach and the network equipment.
Background technology
Intermediate System-to-Intermediate System (English：Intermediate System to Intermediate System,
IS-IS) Routing Protocol is Interior Gateway Protocol.In order to accelerate routing convergence speed in Intermediate System-Intermediate System, the place of equipment is reduced
Pressure is managed, network is subjected to region division.
In trans-regional message forwarding, if there is multiple outlet devices to perimeter, the network equipment is it should be understood that area
Overseas routing iinformation.Thus one in multiple outlet devices can be used in message forwarding so that network overhead is minimum.Area
It is a kind of mode for the route for understanding region outer network equipment that inter-domain routing, which introduces,.At the same time positioned at the zone boundary net of multiple regions
Route in one region, can be incorporated into another region by network equipment, and the route of introducing can be transmitted to described another
The network equipment in one region.Interregional mutually route introducing can be mutually introduced up to Internet protocol (English by interregional
Text：Internet Protocol, IP) address entry realizes.When the mutual route of interregional progress introduces, a region is drawn
The reachable IP address entry gone out may be introduced into go back to a region.When network structure changes in a region,
The reachable IP address entry led back, which may result in, there is loop.
The content of the invention
This application provides a kind of address transfer approach and the network equipment, helps easily to solve intErzone routing introducing
There is the problem of loop.
A kind of first aspect, there is provided address transfer approach.Wherein first network equipment is located at first area and the secondth area
In domain.The first network equipment includes the first Link State Database and the second Link State Database.First link
The link state data of the network equipment in first area described in status data library storage.The second Link State Database storage
The link state data of the network equipment in the second area.The described method includes：
The first network equipment obtains first up to Internet protocol IP address according to first Link State Database
Entry set.Described first includes to one up to IP address up to each reachable IP address entry in IP address entry set
And area identification set.Area identification in the area identification set indicates the reachable IP address entry via the area
The network equipment in the region that domain identifier is identified obtains.Described first is reachable up to any one in IP address entry set
The area identification set of IP address entry does not include the mark of the second area.
The first network equipment generates second up to IP address entry according to described first up to IP address entry set
Set, is added to first network described in second Link State Database up to IP address entry set by described second and sets
In standby link state data, the generation is included in described first up to each up to IP address in IP address entry set
Increase the mark of the first area in the area identification set of entry.
The first network equipment the second network equipment transmission link state message, link into the second area
State message includes with the addition of described in the described second second Link State Database up to IP address entry set the
The link state data of one network equipment.
In above scheme, when will introduce second area from first area up to IP address entry, increase by firstth area
The mark in domain.By increasing area identification set in up to IP address entry so that can be to up to IP in route is introduced into
The region that address entry is passed through is identified.Thus, avoid the reachable IP address entry of extraction introducing back what is arrived
Region, reduces when network structure changes in region and the possibility of loop occurs.Above scheme need not be according to different networks
Carry out personalized customization, it is not necessary to different control strategies is separately configured on each network equipment for performing and introducing, reduces
The possibility of error configurations.In the case where network area division is complicated, help easily to solve intErzone routing to introduce out
The problem of existing loop.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.In interface error
In the case of configuration, the reachable IP address entry drawn in first area sends back first area in a manner of link state is synchronous
The network equipment in.But the first network equipment will not draw the reachable IP address entry of the mark including first area again
Go out, and then the reachable IP address entry of the mark including first area will not be led back again, be helped avoid in region Intranet
There is loop when changing in network structure.
Alternatively, the method further includes：The first network equipment is according to first Link State Database and institute
When stating the second Link State Database and generating the routing table of the first network equipment, exclusionary zone logo collection includes described the
The reachable IP address entry of the mark in one region.In the case where interface error configures, the reachable IP of extraction first area in
Location entry is sent back in the network equipment of first area in a manner of link state is synchronous.The first network equipment calculates local
Include the reachable IP address entry of self zone mark during route in exclusionary zone, that is, with excluding the reachable IP that self zone is drawn
Location entry, helps avoid loop occur when the network structure in region changes.
Alternatively, the method further includes：The first network equipment uses first Link State Database and institute
State and lack the reachable IP address entry of area identification set in the second Link State Database and generate the first network equipment
Routing table.Under special scenes, such as tag distribution protocol (Label Distribution Protocol, LDP) and IS-IS
During protocol synchronization, the reachable IP address entry generation routing table of the non-introducing of first network equipment prioritizing selection, helps to keep away
There is loop in the transmission for exempting from LDP response messages.
A kind of second aspect, there is provided network equipment.The network equipment is the first net at least two network equipments
Network equipment.The first network equipment is located in first area and second area.The first network equipment includes：First link
Slip condition database, the second Link State Database and processing unit.
First Link State Database, for storing the link state data of the network equipment in the first area.
Second Link State Database, for storing the link state data of the network equipment in the second area.
The processing unit, for obtaining first up to IP address sets of entries according to first Link State Database
Close.Described first includes one up to IP address and region up to each reachable IP address entry in IP address entry set
Logo collection.Area identification in the area identification set indicates the reachable IP address entry via the area identification institute
The network equipment in the region of mark obtains.Described first up to any one in IP address entry set up to IP address bar
Purpose region logo collection does not include the mark of the second area.
The processing unit, is additionally operable to generate second up to IP address bar up to IP address entry set according to described first
Mesh set, is added to first network described in second Link State Database by described second up to IP address entry set
In the link state data of equipment.The generation is included in described first up to each reachable IP in IP address entry set
Increase the mark of the first area in the area identification set of location entry.
The processing unit, is additionally operable to the second network equipment transmission link state at least two network equipment
Message.Second network equipment is located in the second area.The Link State Packet can including with the addition of described second
The link state data of first network equipment described in second Link State Database up to IP address entry set.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.
Alternatively, the processing unit is additionally operable to according to first Link State Database and second link state
When database generates the routing table of the first network equipment, exclusionary zone logo collection includes the mark of the first area
Up to IP address entry.
Alternatively, the processing unit is also used for first Link State Database and second link state
The reachable IP address entry for lacking area identification set in database generates the routing table of the first network equipment.
The such scheme of second aspect is identical with using the correspondence scheme of same approach to have in first aspect description content
Technique effect.
A kind of third aspect, there is provided network equipment.The network equipment is the first net at least two network equipments
Network equipment.The first network equipment is located in first area and second area.The first network equipment includes memory, place
Manage device and network interface.
The memory, for storing the first Link State Database and the second Link State Database.First chain
The link state data of the network equipment in first area described in line state database purchase.Second Link State Database is deposited
Store up the link state data of the network equipment in the second area.
The processor, for obtaining first up to IP address entry set according to first Link State Database.
Described first includes one up to each reachable IP address entry in IP address entry set marks up to IP address and region
Know set.Area identification in the area identification set indicates that the reachable IP address entry is marked via the area identification
The network equipment in the region of knowledge obtains.Described first up to any one in IP address entry set up to IP address entry
Area identification set do not include the mark of the second area.
The processor, is additionally operable to generate second up to IP address entry up to IP address entry set according to described first
Set, is added to first network described in second Link State Database up to IP address entry set by described second and sets
In standby link state data.The generation is included in described first up to each up to IP address in IP address entry set
Increase the mark of the first area in the area identification set of entry.
The processor, is additionally operable to set by second network of the network interface at least two network equipment
Preparation send Link State Packet.Second network equipment is located in the second area.The Link State Packet includes adding
The chain of first network equipment described in the described second second Link State Database up to IP address entry set is added
Line state data.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.
Alternatively, the processor is additionally operable to according to first Link State Database and the second link state number
When generating the routing table of the first network equipment according to storehouse, what exclusionary zone logo collection included the mark of the first area can
Up to IP address entry.
Alternatively, the processor is also used for first Link State Database and the second link state number
The routing table of the first network equipment is generated according to the reachable IP address entry for lacking area identification set in storehouse.
The such scheme of the third aspect is identical with using the correspondence scheme of same approach to have in first aspect description content
Technique effect.
Brief description of the drawings
Fig. 1 is a kind of possible application scenarios schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of address transfer approach provided in an embodiment of the present invention；
Fig. 3 is a kind of possible application scenarios schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of structure chart of the network equipment provided in an embodiment of the present invention；
Fig. 5 is a kind of structure chart of the network equipment provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula makes a further detailed description.
Fig. 1 is a kind of possible application scenarios schematic diagram provided in an embodiment of the present invention.Network includes network shown in Fig. 1
Equipment R1, network equipment R2, network equipment R3, network equipment R4 and network equipment R5.Intermediate System to Intermediate System is used in the network.
The network includes first area and second area.The first area and second area for example can be in the network
Further division forms in one region.Network equipment R1, network equipment R2, network equipment R3 and network equipment R4 are located at the firstth area
In domain, network equipment R1, network equipment R2 and network equipment R5 are located in second area.Wherein network equipment R1 and the network equipment
For R2 at the same time in the first area and second area, i.e. network equipment R1 and network equipment R2 are located at first area and second
On the border in region.The network equipment can be one layer of (English in Intermediate System to Intermediate System：Level-1) equipment, two layers of (English：Level-
2) equipment or one or two layers of (English：Level-1-2) equipment.The network equipment in the same area is same layer equipment.For example, institute
It is all two-layer equipment to state network equipment R1, network equipment R2, network equipment R3, network equipment R4 and network equipment R5.In another example
Network equipment R3 and network equipment R4 is one layer of equipment, and network equipment R1 and network equipment R2 are a two-layer equipments, the network equipment
R5 is one layer or two-layer equipment.In another example network equipment R3 and network equipment R4 are two-layer equipments, network equipment R1 and network are set
Standby R2 is a two-layer equipment, and network equipment R5 is one layer or two-layer equipment.
Network equipment R1, network equipment R2, network equipment R3 and network equipment R4 in first area include link shape
State database (link state database, LSDB).Each LA Management Room of first area is defined same by IS-IS
Step mechanism, remains the content synchronization of Link State Database.The LSDB of each network equipment of the first area includes
Network equipment R1 in one region, network equipment R2, the link state of network equipment R3 and network equipment R4.It is each in first area
The link state of the network equipment can be included up to IP address entry.The reachable IP address entry describes each network and sets
The standby IP address information that can be reached.Between network equipment R1, network equipment R2 and network equipment R5 in second area also by
The synchronization mechanism that IS-IS is defined, keeps the content synchronization of LSDB.The LSDB of each network equipment in the second area includes
The link state of network equipment R1, network equipment R2 and network equipment R5 in second area.Each network equipment in second area
Link state can include the reachable IP address entry for describing the IP address information that each network equipment can reach.With
The IP address information that can be reached described in upper is included inside IP up to reachable information outside information, IP and extension IP up to information.
Network equipment R1 and network equipment R2 in first area and second area, each includes two LSDB at the same time.
One of LSDB is synchronous with the LSDB holdings of other equipment in first area, another LSDB and other equipment in second area
LSDB keep synchronous.For sake of convenience, hereafter the LSDB on each network equipment with the network equipment in first area is protected
Hold the first LSDB that synchronous LSDB is referred to as on each network equipment, by each network equipment with the network in second area
The LSDB of equipment keeps synchronous LSDB to be referred to as the 2nd LSDB on each network equipment.
, can be by the link state of each network equipment in the first LSDB when network equipment R1 performs intErzone routing introducing
Reachable IP address entry in data is added in the 2nd LSDB in the link state data of network equipment R1, thus first area
Reachable IP address entry be incorporated into second area.By LSDB synchronization, each network equipment of second area will know through
The reachable IP address entry of the first area can be reached by network equipment R1.Network equipment R2 performs intErzone routing and introduces
When, the reachable IP address entry in the link state data of each network equipment in the 2nd LSDB can be added to the first LSDB
In the link state data of middle network equipment R2, thus the reachable IP address entry of second area is incorporated into first area.It is logical
Cross LSDB synchronization, each network equipment of first area by know via network equipment R2 can reach the second area can
Up to IP address entry.Below for sake of convenience, by the reachable IP address entry in the link state data of a network equipment, letter
The referred to as reachable IP address entry of a network equipment.
Assuming that the reachable IP address entry of network equipment R4 is introduced second area, network by network equipment R1 from first area
This is incorporated into first area by equipment R2 up to IP address entry from second area again, then may result in loop.Such as net
In the case that the link of network equipment R3 to network equipment R4 breaks down, network equipment R3 E-Packets to network equipment R4.By
In the reachable IP address entry for the network equipment R4 that network equipment R3 aware networks equipment R2 is introduced, network equipment R3 can be by message
It is sent to network equipment R2.After message is forwarded in second area, then network equipment R3 sent back by network equipment R1.Thus
Mistake introducing up to IP address entry causes loop occur.Network equipment R1 knows in first area network equipment R3 to network
The link failure of equipment R4, but receive the reachable IP address entry of the network equipment R4 of network equipment R2 introducings.Network equipment R1
It may proceed to again introduce the reachable IP address entry of the network equipment R2 network equipment R4 introduced to second area.Due to existing
Circulation introduced above, the loop will exist always.
The multizone network equipment can be managed using multi-process in ISIS networks.Each network equipment in network
On all operations be used to safeguard the process of itself LSDB, each process is equipped with the process identification (PID) of itself.In the feelings of multiple regions
Under condition, the process on the network equipment in each region can configure identical process identification (PID).The network equipment of different zones
On process mark it is different.Operation includes the process of the first process identification (PID) on each network equipment in first area.Second
Operation includes the process of the second process identification (PID) on each network equipment in region.At the same time positioned at first area and second area
Then operation has the process of the first process identification (PID) and the process of the second process identification (PID) to the network equipment at the same time.It is assumed hereinafter that the first process
P1 is identified as, the process with the first process identification (PID) is referred to as process P1.Assuming that the second process identification (PID) is P2, will have second
The process of process identification (PID) is referred to as process P2.Thus on network equipment R1 there is process P1 and process P2 to be respectively used to safeguard network
On the first LSDB of equipment R1 and the 2nd LSDB, network equipment R2 there is process P1 and process P2 to be respectively used to safeguard the network equipment
The first LSDB of R2 and the 2nd LSDB.The embodiment of the present invention identifies the mark as each region using process above.In LSDB
Including each network equipment reachable IP address entry in increase the mark in the region as tracking information.Positioned at regional edge
The network equipment on boundary identifies the area identification up to IP address entry when carrying out intErzone routing introducing, helps to solve region
Between route introducing there is the problem of loop.
Fig. 2 is a kind of flow chart of address transfer approach provided in an embodiment of the present invention.This method can be applied to Fig. 1 institutes
Show scene.This method includes：
201st, network equipment R1 obtains first up to IP address entry set according to the first Link State Database, and described the
One includes one up to IP address and area identification set up to each reachable IP address entry in IP address entry set.
Area identification in the area identification set indicates the reachable IP address entry via the area identification institute
The network equipment in the region of mark obtains.Described first up to any one in IP address entry set up to IP address bar
Purpose region logo collection does not include the mark of the second area.
For example, network equipment R1 is located in first area and second area, including the first LSDB and the 2nd LSDB.Institute
The link state data that the first LSDB stores the network equipment in the first area is stated, the 2nd LSDB stores secondth area
The link state data of the network equipment in domain.The reachable IP address entry, is, for example, the reachable IP address bar of network equipment R4
Mesh.
The area identification set can be empty set including an area identification or be identified including multiple regions.It is described
Area identification in area identification set is indicated in the region that the reachable IP address entry is identified via the area identification
The network equipment obtain.Using the process identification (PID) run in each region on the network equipment come as region in the embodiment of the present invention
Mark.Such as the mark of first area and second area can be respectively P1 and P2.The area identification set includes multiple
During area identification, represent that the reachable IP address entry is repeatedly introduced via multiple regions.Such as up to IP address entry
When area identification set includes the mark P3 of the mark P1 of first area, the mark P2 of second area and the 3rd region, represent
This once reached first, second, and third region up to IP address entry, was finally introduced to one's respective area.When up to IP address
When the area identification collection of entry is combined into empty set, that is, when not including any area identification in the reachable IP address entry, table
Show that the reachable IP address entry is introduced from other regions.Such as in first area network equipment R4 reachable IP address
For entry when not being brought out, not comprising area identification, its area identification collection is combined into empty set.
Network equipment R1 according to the first LSDB obtain first up to IP address entry set can be directly acquire or substep
Obtain.Directly acquire and refer to concurrently set area identification collection when network equipment R1 reads the reachable IP address entry in the first LSDB
The restrictive condition for the mark for not including the second area is closed, thus directly obtains described first up to IP address entry set.
Substep, which obtains, refers to that network equipment R1 reads all reachable IP address entries in the first LSDB first.Then network equipment R1 exists
Area identification set is extracted in all reachable IP address entries does not include the reachable IP address entry of mark of the second area
To obtain described first up to IP address entry set.Or network equipment R1 deletes region in all reachable IP address entries
The reachable IP address entry of the mark of logo collection including the second area is to obtain described first up to IP address sets of entries
Close.
202nd, network equipment R1 generates second up to IP address sets of entries according to described first up to IP address entry set
Close, described second is added to up to IP address entry set the link of network equipment R1 in second Link State Database
In status data, the generation is included in described first up to each area up to IP address entry in IP address entry set
Increase the mark of the first area in domain identifier set.
For example, network equipment R1 increases in the set of the area identification of the reachable IP address entry of network equipment R4
The mark P1 of first area.The reachable IP address entry of increase mark P1 is added to the net of upper 2nd LSDB of network equipment R1
In the link state data of network equipment R1.Thus, when intErzone routing introduces, the area in the region passed through up to IP address entry
Domain identifier is saved to up in IP address entry.The area identification can be indicated up to IP as a kind of tracking information
The network equipment in the region that location entry is identified via the area identification obtains.Thus net in being introduced into up to IP address entry
Network equipment can avoid introducing the reachable IP address entry of extraction to being identified up to the region that IP address entry is passed through
Go back to the region arrived.The program helps easily to solve the problems, such as that loop occurs in intErzone routing introducing.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.It is described to delete
There is the effect of prevention loop under some error configurations scenes.For example, in Fig. 1 scenes the interface of network equipment R2 by mistake
Configuration.A process on network equipment R2 is configured such that with two interfaces being connected with network equipment R3 and network equipment R5.
In first area in the LSDB and second area of the network equipment LSDB of the network equipment by false sync.Wherein network equipment R1 will
The reachable IP address entry of network equipment R4 is incorporated into the 2nd LSDB, each equipment all aware networks equipment R1 of second area
Reachable IP address entry with network equipment R4.After false sync, network equipment R3 knows network equipment R1 in second area
Synchronizing information, i.e. network equipment R1 have network equipment R4 reachable IP address entry.As network equipment R3 in first area
To network equipment R4 link down when, network equipment R3 sets the message for the reachable IP address for being sent to network equipment R4 to network
Standby R1 is forwarded.Although network equipment R1 knows the link failure of network equipment R3 to network equipment R4 in first area, but continue
The reachable IP address entry for the network equipment R4 that first area is gone back to from second area false sync is received, and is continued this up to IP
Address entry is introduced to second area.Due to introducing circulation up to IP address entry more than existing, network equipment R3 continues will hair
Message toward the reachable IP address of network equipment R4 is forwarded to network equipment R1.If network equipment R1 identifications are up to IP address bar
The mark of first area in mesh, can aid in and prevent this problem.In the case where the interface error configures, the network equipment
R1 to described first up in IP address entry set reachable IP address entry increase first area mark before, first from
Described first up to the reachable IP address entry that the mark including first area is deleted in IP address entry set.Thus, net
Network equipment R1 will not draw the reachable IP address entry for the mark for including first area again, help avoid false sync
Caused message sends problem.
Alternatively, the Link State Database that each network equipment in the first area includes according to its own generates
During routing table, exclusionary zone logo collection includes the reachable IP address entry of the mark of first area.Match somebody with somebody in the interface error
In the case of putting, the reachable IP address entry that network equipment R1 and network equipment R3 second areas are known includes the mark of first area
Know.Network equipment R1 can exclude to include first area mark when calculating local routing according to the first LSDB and the 2nd LSDB
Reachable IP address entry.Network equipment R3 can exclude to include first area when calculating local routing according to the first LSDB
The reachable IP address entry of mark.By the reachable IP address entry for excluding to include first area mark, mistake is helped avoid
Message caused by synchronization sends problem.
203rd, network equipment R1 network equipment R5 transmission link state messages into the second area.
The Link State Packet includes with the addition of described second the second link shape up to IP address entry set
The link state data of network equipment R1 described in state database.Network equipment R1 is to network equipment R5 transmission link state messages
To carry out the synchronization of the LSDB of second area.
Alternatively, the mode of Link State Packet usage type length value (type-length-value, TLV) carries
The set of area identification.For example, RFC5305 gives a kind of extended mode of Intermediate System to Intermediate System, can be incited somebody to action using the extended mode
Area identification set is added in Link State Packet.RFC5305, which gives, can include multiple types in Link State Packet
The extension IP that type is 135 is up to TLV.The extension IP that each type is 135 can be used for carrying one up to IP up to TLV
Location entry, including up to IP address and metric etc., the metric such as expense.The extension IP that the type is 135 can
It can include more sub- TLV up in TLV.Every sub- TLV includes type, length and the value of the sub- TLV.It can be used in the present embodiment
One of them sub- TLV carrys out carrier area mark.Such as choose sub- TLV type type be 81, length length is 4*N word
Section, in the N number of area identification of value value partial encapsulations, wherein each area identification accounts for 4 bytes.
204th, network equipment R5 receives the Link State Packet from network equipment R1.
Network equipment R5 obtains the link state data of network equipment R1 from the Link State Packet, is saved in network
In the Link State Database of equipment R5.
Alternatively, network equipment R5 generates routing table according to i.e. the 2nd LSDB of the Link State Database of itself, and network is set
Standby R5 receives data message to be forwarded, obtains the destination address of the data message, according to the destination address from the road
By obtaining next-hop network device address in table, the down hop network equipment forwards the data message.The destination address can
With the reachable IP address in the reachable IP address entry that is introduced into including network equipment R1.
205th, network equipment R5 sends the link for the link state data for including network equipment R1 to network equipment R2
State message.
The Link State Packet includes with the addition of described second up to the network equipment R1's of IP address entry set
Link state data.
206th, network equipment R2 receives the Link State Packet from network equipment R5.
Network equipment R2 obtains the link state data of the network equipment R1 from the Link State Packet, is saved in
In the Link State Database of network equipment R2.Each word in the link state data of network equipment R2 identification network equipments R1
Section is saved in the 2nd LSDB of network equipment R2.Thus network equipment R2 stores described second up to IP in the 2nd LSDB
Address entry set.For example, network equipment R2 obtains the extension IP that type type is 135 from the Link State Packet
Up to TLV, obtained from the extension IP up to TLV up to the reachable IP address in IP address entry and metric etc..Network is set
Standby R2 also obtains the sub- TLV that type type is 81 from the extension IP up to TLV, obtains the area identification in the sub- TLV.Net
Network equipment R2 is saved in network equipment R2's by more than up to reachable IP address, metric and area identification of IP address entry etc.
In 2nd LSDB.
207th, network equipment R2 obtains the 3rd up to IP address entry set from the 2nd LSDB, and the described 3rd up to IP
Each reachable IP address entry in the entry set of location includes one up to IP address and area identification set.
Area identification in the area identification set indicates the reachable IP address entry via the area identification institute
The network equipment in the region of mark obtains, the described 3rd up to any one in IP address entry set up to IP address article
Purpose region logo collection does not include the mark of the first area.
The operation that network equipment R2 is performed in 207 is similar with the operation of network equipment R1 execution in 201, and identical content exists
This is repeated no more.The reachable IP address entry that network equipment R1 is incorporated into second area from first area all includes first area
Mark, therefore the described 3rd will not be entered up to IP address entry set.Thus avoid the reachable IP address entry of extraction
The region arrived is introduced go back to, helps easily to solve the problems, such as that loop occurs in intErzone routing introducing.
208th, network equipment R2 generates the 4th up to IP address sets of entries according to the described 3rd up to IP address entry set
Close, the described 4th is added to up to IP address entry set the link shape of the network equipment R2 of the first LSDB of network equipment R2
In state data, the generation is included in the described 3rd up to each up to IP address article purpose region in IP address entry set
Increase the mark of the second area in logo collection.
The operation that network equipment R2 is performed in 208 is similar with the operation of network equipment R1 execution in 202, and identical content exists
This is repeated no more.
209th, network equipment R2 network equipment R3 transmission link state messages into the first area.
The Link State Packet includes with the addition of the described 4th the first link shape up to IP address entry set
The link state data of network equipment R2 described in state database.
The operation that network equipment R2 is performed in 209 is similar with the operation that network equipment R1 in 203 is performed, and no longer goes to live in the household of one's in-laws on getting married herein
State.
210th, network equipment R3 is from network equipment R2 receiving link status messages.
Network equipment R3 obtains the link state data of network equipment R2 from the Link State Packet, is saved in network
In the Link State Database of equipment R3.
The operation that network equipment R3 is performed in 210 is similar with the operation that network equipment R5 in 204 is performed, and no longer goes to live in the household of one's in-laws on getting married herein
State.
211st, network equipment R3 generates routing table according to the Link State Database of itself, is reported according to the routing table
Text forwarding.
Network equipment R3 receives data message to be forwarded, the destination address of the data message is obtained, according to the mesh
Address obtain next-hop network device address from the routing table, the down hop network equipment forwards the data message.
The destination address can include the reachable IP address in the reachable IP address entry that network equipment R2 is introduced into.
In above procedure, network equipment R1 and network equipment R2 are identified up to IP when introduced up to IP address entry
The set of area identification in address entry.The reachable IP address entry drawn from a region will not be then introduced into the region,
Help to solve the problems, such as that loop occurs in intErzone routing introducing.And above solution need not according to different networks into
Row personalized customization, it is not necessary to different control strategies is separately configured on each network equipment for performing and introducing, reduces mistake
The possibility of misconfiguration.In the case where network area division is complicated, help easily to solve intErzone routing introducing appearance
The problem of loop.
The scheme introduced above up to IP address entry, in some scenarios, can run into another loop problem.Such as
There are the network of special screne shown in Fig. 3, tag distribution protocol (Label Distribution are used in the network
Protocol, LDP) and Intermediate System to Intermediate System synchronization mechanism.Network equipment R1 and network equipment R2 is located at first area and second area
In.The first area and second area for example can be that further division forms to a region in the network.Network
Equipment R3 is only located in first area.Network equipment R5 is only located in second area.Network equipment R1 and network equipment R2 match somebody with somebody
It is set to and the reachable IP address entry of first area is incorporated into second area., can in LDP and Intermediate System to Intermediate System synchronization mechanism
After being introduced into up to IP address entry, this is all set as a fixed value, such as 10000 up to the expense of IP address entry.Network
Equipment R1 and network equipment R2 with can obtaining the reachable IP of network equipment R3 according to the link state data of network equipment R3
Location entry.If the reachable IP address entry of network equipment R3 is incorporated into the 2nd LSDB by network equipment R2 from the first LSDB.
Then pass through LSDB synchronization, in the 2nd LSDB of network equipment R1, the link state data of network equipment R2 will include network
The reachable IP address entry of equipment R3.Network equipment R1 by the 2nd LSDB aware networks equipment R2 with network equipment R3 can
Up to IP address entry, and expense is 10000.When being reconnected after network equipment R3 to the link down of network equipment R1, net
Network equipment R3 can send LDP Initial messages to network equipment R1.Network equipment R3 needs to return to response report to network equipment R1
Text, thus re-establishes LDP connections.In LDP and IS-IS synchronization mechanisms, the network is set during LDP connections are established
The expense of standby R3 to network equipment R1 links is set as maximum, such as 1677214.Net in the first LSDB of network equipment R1 at this time
The expense of the reachable IP address entry of network equipment R3 is maximum 1677214.And as it was previously stated, performing up to IP address entry
During introducing, in the 2nd LSDB of network equipment R2, the reachable IP of network equipment R3 in the link state data of network equipment R2
The expense of location entry is always fixed value 10000.Thus LSDB synchronization is passed through, the first LSDB of network equipment R1 includes expense
For the reachable IP address entry of 1677214 network equipment R3, it is 10000 to belong to the network equipment that the 2nd LSDB, which includes expense,
The reachable IP address entry of the network equipment R3 of the link state data of R2.Network equipment R1 belongs to net by selection expense smaller
The reachable IP address entry of the network equipment R3 of the link state data of network equipment R2.Thus, network equipment R1 is to the network equipment
R2 sends response message.After network equipment R2 receives the response message, further according to the network equipment R3 in the first LSDB can
The response message is sent back into network equipment R1 up to IP address entry.Thus there is loop.
Alternatively, network equipment R1 uses the reachable IP address for lacking area identification set in the first LSDB and the 2nd LSDB
The routing table of entry generation network equipment R1.The reachable IP address entry for lacking area identification set above refers to not include region
The reachable IP address entry of logo collection, or refer to area identification collection and be combined into empty set i.e. area identification set and do not include area identification
Reachable IP address entry.The reachable IP address entry for lacking area identification set, draws without up to IP address entry
Enter or draw.Thus the first LSDB and second is used for the scene of above-mentioned LDP and IS-IS synchronizations, the network equipment R1
Lack the reachable IP address entry generation routing table of area identification set in LSDB.That is, the network equipment calculates local road
By when, reachable the IP address entry of network equipment R3 that expense is 10000 is foreclosed, selection expense for 1677214 can
Up to IP address entry.Thus network equipment R1 returns response message according to the reachable IP address entry that the expense is 1677214
Back to network equipment R3, LDP establishment of connections are realized.Given birth to due to the use of the reachable IP address entry of the set without area identification
Into routing table, the reachable IP address entry being introduced into forecloses so that network equipment R1 is able to reuse that the expense most
Big link sends response message.Thus, network equipment R1 is based on routing table and sends response message to network equipment R3, successfully builds
Vertical LDP connections.The reachable IP address entry for lacking area identification set is used only in network equipment R1 in router-level topology, excludes to draw
There is loop in the reachable IP address entry entered, the transmission for helping avoid LDP response messages.LDP response messages are successfully transmitted,
So that real-time performance LDP and Intermediate System to Intermediate System are synchronous.
Fig. 4 shows a kind of structure chart of network equipment 400 provided in an embodiment of the present invention.The network equipment 400 can be used
Method in the corresponding embodiments of execution Fig. 1 to Fig. 3 performed by network equipment R1 or network equipment R2.The network equipment 400 is
First network equipment 400 at least two network equipments.First network equipment 400 is located in first area and second area.
The first area and second area for example can be that further division forms to a region in network.First network equipment
400 include：First Link State Database 401, the second Link State Database 402 and processing unit 403.Processing unit 403
Connect the first Link State Database 401.Processing unit 403 connects the first Link State Database 402.
First Link State Database 401, for storing the link state data of the network equipment in the first area.
Second Link State Database 402, for storing the link state data of the network equipment in the second area.
Processing unit 403, for obtaining first up to IP address entry set according to the first Link State Database 401.
Described first includes one up to each reachable IP address entry in IP address entry set marks up to IP address and region
Know set.Area identification in the area identification set indicates that the reachable IP address entry is marked via the area identification
The network equipment in the region of knowledge obtains.Described first up to any one in IP address entry set up to IP address entry
Area identification set do not include the mark of the second area.
Processing unit 403, is additionally operable to generate second up to IP address bar up to IP address entry set according to described first
Mesh set, is added to first network equipment in the second Link State Database 402 by described second up to IP address entry set
In 400 link state data.The generation is included in described first up to each reachable IP in IP address entry set
Increase the mark of the first area in the area identification set of location entry.
Processing unit 403, is additionally operable to the second network equipment transmission link state at least two network equipment
Message.Second network equipment is located in the second area.The Link State Packet can including with the addition of described second
The link state data of first network equipment 400 up in the second Link State Database 402 of IP address entry set.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.
Alternatively, processing unit 403 is additionally operable to according to the first Link State Database 401 and the second Link State Database
During the routing table of 402 generation first network equipment 400, exclusionary zone logo collection includes the reachable of the mark of the first area
IP address entry.
Alternatively, processing unit 403 is also used for the first Link State Database 401 and the second link state number
The routing table of first network equipment 400 is generated according to the reachable IP address entry for lacking area identification set in storehouse 402.
First Link State Database 401, the second Link State Database 402 and processing unit 403 in Fig. 4 either
The software code stored in memory the functional unit that generates afterwards of operation is read by processor to realize or by hardware
Unit is realized.
Fig. 5 shows a kind of structure chart of network equipment 500 provided in an embodiment of the present invention.The network equipment 500 is at least
First network equipment 500 in two network equipments.First network equipment 500 can be router or have router-level topology and report
The other types network equipment of literary forwarding capability.First network equipment 500 can be used for performing in the corresponding embodiments of Fig. 1 to Fig. 3
Method performed by network equipment R1 or network equipment R2.First network equipment 500 can be used for realizing in the corresponding embodiments of Fig. 4
The function of first network equipment 400.First network equipment 500 is located in first area and second area.The first area and
Second area for example can be that further division forms to a region in network.First network equipment 500 includes memory
501st, processor 502 and network interface 503.Processor 502 connects the storage and reading that memory 501 carries out data.Processor
502 are also connected with network interface 503, and control network interface 503 carries out the transmitting-receiving of message or order.
Memory 501, for storing the first Link State Database and the second Link State Database.First link
The link state data of the network equipment in first area described in status data library storage.The second Link State Database storage
The link state data of the network equipment in the second area.
Processor 502, for obtaining first up to IP address entry set according to first Link State Database.Institute
State first includes one up to IP address and area identification up to each reachable IP address entry in IP address entry set
Set.Area identification in the area identification set indicates that the reachable IP address entry is identified via the area identification
Region in the network equipment obtain.Described first up to any one in IP address entry set up to IP address entry
Area identification set does not include the mark of the second area.
Processor 502, is additionally operable to generate second up to IP address entry up to IP address entry set according to described first
Set, is added to first network equipment in second Link State Database by described second up to IP address entry set
In 500 link state data.The generation is included in described first up to each reachable IP in IP address entry set
Increase the mark of the first area in the area identification set of location entry.
Processor 502, is additionally operable to second network equipment at least two network equipment by network interface 503
Transmission link state message.Second network equipment is located in the second area.The Link State Packet includes addition
Described second up to first network equipment 500 in second Link State Database of IP address entry set link shape
State data.
Alternatively, the generation is additionally included in before the mark for increasing the first area, from described first up to IP
The reachable IP address entry that area identification set includes the mark of the first area is deleted in the entry set of location.
Alternatively, processor 502 is additionally operable to according to first Link State Database and the second link state number
According to storehouse generation first network equipment 500 routing table when, what exclusionary zone logo collection included the mark of the first area can
Up to IP address entry.
Alternatively, processor 502 is also used for first Link State Database and the second link state number
The routing table of first network equipment 500 is generated according to the reachable IP address entry for lacking area identification set in storehouse.
Processor 502 can be central processing unit (English：Central processing unit, CPU), network processes
Device (English：Network processor, NP) or CPU and NP combination.
Memory 501 can include volatile memory (English：Volatile memory), such as random access memory
Device (English：Random-access memory, RAM).Memory 501 can also include nonvolatile memory (English：non-
Volatile memory), such as read-only storage (English：Read-only memory, ROM), flash memory (English：
Flash memory), hard disk (English：Hard disk drive, HDD) or solid state hard disc (English：solid-state
Drive, SSD).Memory 501 can also include the combination of the memory of mentioned kind.
Alternatively, memory 501 can be incorporated into processor 502, as the internal part of processor 502.
Network interface 503 can be Ethernet interface, asynchronous transfer mode (English：Asynchronous Transfer
Mode, ATM) interface or based on SDH/SONET encapsulation (English：Packet over SONET/SDH, POS) interface.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (12)
- A kind of 1. address transfer approach, it is characterised in that first network equipment is located in first area and second area, and described One network equipment includes the first Link State Database and the second Link State Database, and first Link State Database is deposited The link state data of the network equipment in the first area is stored up, second Link State Database stores the second area The link state data of the middle network equipment, the described method includes：The first network equipment obtains first up to Internet protocol IP address entry according to first Link State Database Set, described first includes one up to IP address and area up to each reachable IP address entry in IP address entry set Domain identifier set, the area identification in the area identification set indicate the reachable IP address entry via the area identification The network equipment in the region identified obtains, described first up to any one in IP address entry set up to IP address The area identification set of entry does not include the mark of the second area；The first network equipment according to described first up to the generation second of IP address entry set up to IP address entry set, It is added to first network equipment described in second Link State Database up to IP address entry set by described second In link state data, the generation is included in described first up to each up to IP address entry in IP address entry set Area identification set in increase the mark of the first area；The first network equipment the second network equipment transmission link state message, link state into the second area Message includes with the addition of the first net described in the described second second Link State Database up to IP address entry set The link state data of network equipment.
- 2. the method as described in claim 1, it is characterised in that the generation is additionally included in the mark for increasing the first area Before, from described first up to deleted in IP address entry set area identification set include the first area mark can Up to IP address entry.
- 3. method as claimed in claim 1 or 2, it is characterised in that the method further includes：The first network equipment in first Link State Database and second Link State Database can When generating the routing table of the first network equipment up to IP address entry, exclusionary zone logo collection includes the first area The reachable IP address entry of mark.
- 4. the method as described in claims 1 to 3 any one, it is characterised in that the method further includes：The first network equipment in first Link State Database and second Link State Database using lacking The reachable IP address entry of area identification set generates the routing table of the first network equipment.
- A kind of 5. network equipment, it is characterised in that the network equipment is the first network equipment at least two network equipments, The first network equipment is located in first area and second area, and the first network equipment includes：First Link State Database, for storing the link state data of the network equipment in the first area；Second Link State Database, for storing the link state data of the network equipment in the second area；Processing unit, is used for：It is reachable up to Internet protocol IP address entry set, described first that first is obtained according to first Link State Database Each reachable IP address entry in IP address entry set includes one up to IP address and area identification set, the area Area identification in domain identifier set is indicated in the region that the reachable IP address entry is identified via the area identification The network equipment obtains, the described first area identification collection up to any one in IP address entry set up to IP address entry Closing does not include the mark of the second area；Second is generated up to IP address entry set up to IP address entry set according to described first, by described second up to IP Address entry set is added to described in second Link State Database in the link state data of first network equipment, institute State generation and be included in described first up in each area identification set up to IP address entry in IP address entry set Increase the mark of the first area；The second network equipment transmission link state message at least two network equipment, second network equipment position In the second area, the Link State Packet includes with the addition of described second up to described the of IP address entry set The link state data of the network equipment described in two Link State Database.
- 6. the network equipment as claimed in claim 5, it is characterised in that the generation is additionally included in the increase first area Before mark, include the mark of the first area up to deletion area identification set in IP address entry set from described first Reachable IP address entry.
- 7. the network equipment as described in claim 5 or 6, it is characterised in that the processing unit is additionally operable to：The first network equipment is generated according to first Link State Database and second Link State Database During routing table, exclusionary zone logo collection includes the reachable IP address entry of the mark of the first area.
- 8. the network equipment as described in claim 5 to 7 any one, it is characterised in that the processing unit is additionally operable to：Can using lack area identification set in first Link State Database and second Link State Database The routing table of the first network equipment is generated up to IP address entry.
- A kind of 9. network equipment, it is characterised in that the network equipment is the first network equipment at least two network equipments, The first network equipment is located in first area and second area, the first network equipment include memory, processor and Network interface, wherein,The memory, for storing the first Link State Database and the second Link State Database, the first link shape The link state data of the network equipment in first area described in state database purchase, second Link State Database store institute State the link state data of the network equipment in second area；The processor, is used for：It is reachable up to Internet protocol IP address entry set, described first that first is obtained according to first Link State Database Each reachable IP address entry in IP address entry set includes one up to IP address and area identification set, the area Area identification in domain identifier set is indicated in the region that the reachable IP address entry is identified via the area identification The network equipment obtains, the described first area identification collection up to any one in IP address entry set up to IP address entry Closing does not include the mark of the second area；Second is generated up to IP address entry set up to IP address entry set according to described first, by described second up to IP Address entry set is added to described in second Link State Database in the link state data of first network equipment, institute State generation and be included in described first up in each area identification set up to IP address entry in IP address entry set Increase the mark of the first area；Pass through second network equipment transmission link state message of the network interface at least two network equipment, institute State second network equipment to be located in the second area, the Link State Packet includes with the addition of described second up to IP address The link state data of first network equipment described in second Link State Database of entry set.
- 10. the network equipment as claimed in claim 9, it is characterised in that the generation is additionally included in the increase first area Mark before, include the mark of the first area from described first up to deleting area identification set in IP address entry set The reachable IP address entry known.
- 11. the network equipment as described in claim 9 or 10, it is characterised in that the processor is additionally operable to：The first network equipment is generated according to first Link State Database and second Link State Database During routing table, exclusionary zone logo collection includes the reachable IP address entry of the mark of the first area.
- 12. the network equipment as described in claim 9 to 11 any one, it is characterised in that the processor is additionally operable to：Can using lack area identification set in first Link State Database and second Link State Database The routing table of the first network equipment is generated up to IP address entry.
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| CN201610900284.9A CN107959627B (en) | 2016-10-14 | 2016-10-14 | Address transmission method and network equipment |
| CN202110187668.1A CN113037631B (en) | 2016-10-14 | 2016-10-14 | Address transmission method and network equipment |
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| CN107707429A (en) * | 2017-10-17 | 2018-02-16 | 广东睿江云计算股份有限公司 | The method and system that a kind of discovery IP routes are interrupted |
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Also Published As
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| CN107959627B (en) | 2021-02-12 |
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