CN104702501B - A kind of method and device improving TE FRR protection reliability - Google Patents
A kind of method and device improving TE FRR protection reliability Download PDFInfo
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Abstract
The present invention discloses a kind of method and device for improving TE FRR protection reliability, is related to data network communication field, and method includes: head node after the routing information for determining main tunnel, judges in backup tunnel with the presence or absence of the loose nodes as non-destination node；When judging to there are loose nodes as non-destination node in the backup tunnel, head node makes each node on the way carry the PATH message of routing information in it along the backup tunnel to destination node transmission；Head node receives the RESV message for being used to make each node on the way to carry routing information in it that destination node responds the PATH message and inversely sends along the path for transmitting the PATH message；The routing information that head node utilizes the RESV message to carry, determines whether the backup tunnel can carry out TE FRR protection to node to be protected in main tunnel and/or link.The present invention can be improved TEFRR protection reliability.
Description
Technical field
The present invention relates to data network communication fields, in particular to the raising quick heavy-route (Traffic of traffic engineering
Engineering-Fast Re-Route, TE FRR) method and relevant device.
Background technique
TE-FRR technology is a kind of local protection technique locally repaired when local link or node failure.?
In RFC4090, link protection and two kinds of Node Protection local protection types are defined, while also defining and forming protection process
In two kinds of special node types: it is local to repair point (Point of Local Repair, PLR) and convergent point (Merge
Point, MP).
Fig. 1 is the Node Protection topological diagram for the TE-FRR that the prior art provides, as shown in Figure 1, the topological diagram includes: node
R1, R2, R3, wherein R1 is as PLR node, and R3 is as MP node；Link L12, L23, L13, when link L12 failure or node
When R2 fails, path is switched into L13, forms Node Protection.
Fig. 2 is the link protection topological diagram for the TE-FRR that the prior art provides, as shown in Fig. 2, the topological diagram includes: node
R1, R2, R3, wherein R2 is as PLR node, and R3 is as MP node, link L12, L23, L32, when link L23 failure, by road
Diameter switches to L32, forms link protection.After finishing switching, the PATH that is sent from backup tunnel incoming interface in MP node processing,
The upstreams such as PATH-TEAR send protocol massages, for former tunnel protocol massages without processing.
Judge that can a tunnel become the standby tunnel in main tunnel, it usually needs judge whether the tunnel have passed through and protected
Link or node.If have passed through protected link or node, which will not met as the main tunnel of this
The condition of the backup tunnel in road.
Based on this, PLR point needs to know the routing information of main tunnel PLR point to MP point, while PLR point needs are known completely
Backup tunnel path.
Tunnel is when establishing, it is understood that there may be loose point, then PLR point is just not easy to know main tunnel PLR point to MP
The fullpath of point and backup tunnel, because explicit route object (Explicit Route Object, ERO) information is endless
It is whole, as shown in Figure 3.
Main tunnel loosely arrives R2 node, can only know that the fullpath from R1 to R2 (may be by ERO on R1
Fei1/1-fei2/1, it is also possible to fei1/2-fei4/1, fei4/2-fei2/3), but the routing information from R2 to R3
It can not be learnt from ERO, similarly, backup tunnel loosely arrives R4, the fullpath of R1 to R4 can only be known by ERO on R1,
But the routing information from R4 to R3 can not be learnt from ERO.
Assuming that the path that main tunnel passes through are as follows: L12, L23；The path that backup tunnel passes through are as follows: L14, L24, L23.
The path in the main tunnel seen on R1 is L12, and the path of backup tunnel is L14, and subsequent path is all invisible,
It has no way of this when judging whether that FRR relationship can be formed.
Certainly, the method for another to acquisite approachs information is by recording routing object (Record Route
Object, RRO), but RRO needs the head node in tunnel to dispose this configuration.In Practical Project deployment, especially
When disposing backup tunnel, if there is loose, while the not no RRO attribute of configured tunneling technique again, it will lead to the TE of mistake
FRR relationship is formed.
Summary of the invention
The purpose of the present invention is to provide a kind of method and devices for improving TE FRR protection reliability, can better solve
The problem of forming the reliability of TE FRR relationship.
According to an aspect of the invention, there is provided a kind of method for improving TE FRR protection reliability, comprising:
Head node judges in backup tunnel after the routing information for determining main tunnel with the presence or absence of as non-destination node
Loose nodes；
When judging to there are the loose nodes as non-destination node in the backup tunnel, head node is along described standby
Part tunnel is used to make each node on the way to carry the PATH message of routing information in it to destination node transmission；
Head node receives destination node and responds the PATH message and reverse along the path for transmitting the PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it sent；
The routing information that head node utilizes the RESV message to carry, determines whether the backup tunnel can be to main tunnel
In node to be protected and/or link carry out TE FRR protection；
Wherein, TE FRR is the quick heavy-route of traffic engineering.
Preferably, the Path Options used when head node is established using backup tunnel, judge in the backup tunnel whether
In the presence of the loose nodes as non-destination node.
Preferably, the routing information that the PATH message carries includes the node identification of each node of PATH message approach
With outgoing interface address, each node of PATH message approach successively carried in the PATH message received respective node identification and
Outgoing interface address.
Preferably, the routing information that the RESV message carries includes the node identification of each node of RESV message approach
With outgoing interface address, each node of RESV message approach successively carried in the RESV message received respective node identification and
Outgoing interface address.
Preferably, the head node obtains the node of each node of backup tunnel by parsing received RESV message
Mark and outgoing interface address, and using the node identification of each node and outgoing interface address, judge that the backup tunnel is
It is no by node and/or link to be protected in main tunnel, when judging the backup tunnel by be protected in the main tunnel
Node or link when, determine that the backup tunnel cannot carry out TE to node to be protected in the main tunnel and/or link
FRR protection.
Preferably, the head node determines that the step of routing information in main tunnel includes:
Head node judges in main tunnel with the presence or absence of the loose nodes as non-destination node；
When judging to there are the loose nodes as non-destination node in the main tunnel, head node is along the main tunnel
The PATH message that road is used to that each node on the way is made to carry routing information in it to destination node transmission；
Head node receives destination node and responds the PATH message and reverse along the path for transmitting the PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it sent.
Preferably, the Path Options used when head node is established using main tunnel judge to whether there is in the main tunnel
Loose nodes as non-destination node.
According to another aspect of the present invention, a kind of device for improving TE FRR protection reliability is provided, comprising:
Backup tunnel judgment module whether there is in backup tunnel for judging after the routing information for determining main tunnel
Loose nodes as non-destination node；
Backup tunnel sending module, for when the loose section for judging to have as non-destination node in the backup tunnel
When point, the PATH that destination node transmission is used to that each node on the way is made to carry routing information in it along the backup tunnel
Message；
Backup tunnel receiving module, for receiving the destination node response PATH message along the transmission PATH
The RESV message for being used to that each node on the way is made to carry routing information in it that the path of message is inversely sent；
FRR protects determining module, for carrying in the routing information using the main tunnel and the RESV message received
Backup tunnel routing information, determine the backup tunnel whether can to node to be protected in the main tunnel and/or
Link carries out TE FRR protection；
Wherein, TE FRR is the quick heavy-route of traffic engineering.
Preferably, the Path Options used when the backup tunnel judgment module is established using backup tunnel, described in judgement
With the presence or absence of the loose nodes as non-destination node in backup tunnel.
Preferably, further includes:
Main tunnel judgment module, for judging in main tunnel with the presence or absence of the loose nodes as non-destination node；
Main tunnel sending module, for when the loose nodes for judging to have as non-destination node in the main tunnel
When, along the main tunnel to destination node send PATH message, make on the way each node carry road in the PATH message
Diameter information；
Main tunnel receiving module responds the PATH message and along PATH message biography for receiving destination node
The RESV message that defeated path is inversely sent, make on the way each node carry routing information in the RESV message.
Compared with prior art, the beneficial effects of the present invention are:
Passage path information of the present invention, the path for the backup tunnel that knows for sure whether have passed through protected node and/or
Link, to improve the reliability to form TE FRR protection.
Detailed description of the invention
Fig. 1 is the Node Protection topological diagram for the TE-FRR that the prior art provides；
Fig. 2 is the link protection topological diagram for the TE-FRR that the prior art provides；
Fig. 3 is that the loose nodes that the prior art provides calculate road topological diagram；
Fig. 4 is the Method And Principle block diagram provided by the invention for improving TE FRR protection reliability；
Fig. 5 is the apparatus structure block diagram provided by the invention for improving TE FRR protection reliability.
Specific embodiment
Below in conjunction with attached drawing to a preferred embodiment of the present invention will be described in detail, it should be understood that described below is excellent
Select embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
When foundation due to tunnel, there are loose nodes, the loose nodes are not destination node, therefore in ERO
It cannot get the complete routing information in the tunnel.Using loose path when being directed to this calculation road, while loose nodes are not
The case where destination node, the present invention carry routing information (such as RRO) in the interaction message that tunnel is established automatically.
Fig. 4 is the functional block diagram provided by the invention for improving TE FRR protection reliability, as shown in figure 4, step includes:
Step 401, head node judge in backup tunnel after the routing information for determining main tunnel with the presence or absence of as non-mesh
Ground node loose nodes.
Specifically, the Path Options used when head node is established using backup tunnel, judge be in the backup tunnel
The no loose nodes existed as non-destination node.
Further, the head node determines that the step of routing information in main tunnel includes: that head node is built using main tunnel
The Path Options used immediately judge in main tunnel with the presence or absence of the loose nodes as non-destination node；Described in judgement
When there are the loose nodes as non-destination node in main tunnel, head node is sent along the main tunnel to destination node
For making each node on the way carry the PATH message of routing information in it, the routing information that the PATH message carries includes institute
State node identification and the outgoing interface address of each node in the main tunnel of PATH message approach, each node in the main tunnel of PATH message approach
Successively respective node identification and outgoing interface address are carried in the PATH message received；Head node receives destination node response
The PATH message and along the path for transmitting the PATH message inversely send be used to make on the way each node carried in it
The RESV message of routing information, so that the complete routing information in main tunnel is obtained, the routing information that the RESV message carries
Node identification and outgoing interface address including each node of RESV message approach, each node of RESV message approach successively exist
Respective node identification and outgoing interface address are carried in the RESV message received.
Step 402, when judging to there are loose nodes as non-destination node in the backup tunnel, head node edge
The backup tunnel PATH message that is used to that each node on the way is made to carry routing information in it to destination node transmission.
Specifically, the routing information that the PATH message carries includes each node of the PATH message approach backup tunnel
Node identification and outgoing interface address, each node of the PATH message approach backup tunnel successively taken in the PATH message received
With respective node identification and outgoing interface address.
Step 403, head node receive destination node respond the PATH message and along transmitting the PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it that path is inversely sent, to obtain backup tunnel
Complete routing information.
Specifically, the routing information that the RESV message carries includes the node mark of each node of RESV message approach
Know and outgoing interface address, each node of RESV message approach successively carry respective node identification in the RESV message received
With outgoing interface address.
The routing information that step 404, head node utilize the RESV message to carry, determines that the backup tunnel whether can
TE FRR protection is carried out to node to be protected in main tunnel and/or link.
Specifically, the head node obtains the section of each node of backup tunnel by parsing received RESV message
Point identification and outgoing interface address, and using the node identification of each node and outgoing interface address, judge the backup tunnel
Whether by node and/or link to be protected in main tunnel, when judge that the backup tunnel passes through in the main tunnel wait protect
When the node or link of shield, determine that the backup tunnel cannot carry out node to be protected in the main tunnel and/or link
TE FRR protection.
Fig. 5 is the apparatus structure block diagram provided by the invention for improving TE FRR protection reliability, as shown in Figure 5, comprising: standby
Part tunnel judgment module, backup tunnel sending module, backup tunnel receiving module and FRR protect determining module.
The backup tunnel judgment module judges in backup tunnel after the routing information for determining main tunnel with the presence or absence of work
For the loose nodes of non-destination node, specifically, use when the backup tunnel judgment module is established using backup tunnel
Path Options, judge in the backup tunnel with the presence or absence of loose nodes as non-destination node.It is described standby when judging
When there are the loose nodes as non-destination node in part tunnel, the backup tunnel sending module is along the backup tunnel
The PATH message for being used to that each node on the way is made to carry routing information in it to destination node transmission, wherein the PATH disappears
The routing information that breath carries includes node identification and the outgoing interface address of each node of PATH message approach, the PATH message
Each node of approach backup tunnel successively carries respective node identification and outgoing interface address in the PATH message received.It is described standby
Part tunnel receiving module receives destination node and responds the PATH message and reverse along the path for transmitting the PATH message
Send be used to make on the way each node the RESV message of routing information is carried in it, to obtain the complete road of backup tunnel
Diameter information, wherein the routing information that the RESV message carries include each node of RESV message approach node identification and
Outgoing interface address, each node of RESV message approach successively carry respective node identification and are gone out in the RESV message received
Interface IP address.FRR protection determining module in the routing information in the main tunnel and the RESV message that is received using carrying
Backup tunnel routing information, determine the backup tunnel whether can to node to be protected in the main tunnel and/or
Link carries out TE FRR protection, specifically, FRR protection determining module is obtained by parsing received RESV message
The node identification of each node of backup tunnel and outgoing interface address, and using the node identification of each node and outgoing interface
Location, judges whether the backup tunnel passes through node and/or link to be protected in main tunnel, when judging backup tunnel warp
When crossing node or link to be protected in the main tunnel, determine that the backup tunnel cannot be to be protected in the main tunnel
Node and/or link carry out TE FRR protection.
Further, described device further include: main tunnel judgment module, main tunnel sending module and main tunnel receive mould
Block.
The main tunnel judgment module judges with the presence or absence of the loose nodes as non-destination node in main tunnel, specifically
Say that the Path Options that the main tunnel judgment module is used when being established using main tunnel judge whether deposit in the main tunnel in ground
In the loose nodes as non-destination node.When the loose nodes for judging to have as non-destination node in the main tunnel
When, the main tunnel sending module along the main tunnel to destination node send PATH message, make on the way each node in institute
It states and carries routing information in PATH message, wherein the routing information that the PATH message carries includes the PATH message approach
The node identification of the main each node in tunnel and outgoing interface address, the main tunnel of PATH message approach each node are successively receiving
Respective node identification and outgoing interface address are carried in PATH message.The main tunnel receiving module receives destination node response
The PATH message and the RESV message that inversely sends of path transmitted along the PATH message, make on the way each node described
Routing information is carried in RESV message, to obtain the complete routing information in main tunnel, wherein what the RESV message carried
Routing information includes node identification and the outgoing interface address of each node of RESV message approach, and the RESV message approach respectively saves
Point successively carries respective node identification and outgoing interface address in the RESV message received.
By Fig. 4 and Fig. 5 embodiment, the present invention judges what tunnel foundation used when any one tunnel is established
Path Options carry routing information in PATH message and RESV message automatically if there is a situation where following in Path Options
(such as RRO), but regardless of whether there is this configuration of deployment under tunnel, otherwise, due to head node by calculate road known it is described
The complete routing information in tunnel, therefore do not need to carry routing information in PATH message and RESV message.Head node passes through
These routing informations, exact can know whether the path of backup tunnel have passed through protected node and/or link, thus
Improve the reliability that TE FRR is formed.
Situation: having loose nodes, and the loose nodes are the non-destination nodes in tunnel in Path Options, that is,
Say there are the loose nodes as non-destination node in Path Options.
Road topological diagram is calculated below in conjunction with loose nodes shown in Fig. 3, is further described.
As shown in figure 3, it is not loosely first destination node to R2, R2 that the Path Options in main tunnel, which are, i.e. R2 is as non-
The loose nodes of destination node.Assuming that the path that R1 calculates R2 is L12, then needing automatically to disappear in signaling PATH
Routing information (such as: RRO object) is carried in breath, that is, carries the node identification RID of the address fei1/1 and R1.The PATH in main tunnel disappears
After breath reaches R2, R2 further calculates R2 to the path of destination R3, it is assumed that the path at this moment calculated is L23, then R2 is toward R3
The PATH message of transmission can also carry routing information (such as: RRO object), at this moment carry the address fei1/1, the address fei2/2 and
The RID of node R 1 and R2.Destination node R3 can also carry routing information toward the RESV message that upstream is sent, and R2 is sent toward R1
RESV message can carry the RID of fei3/1, fei/2/1 and node R 3 and R2.In this way, R1 passes through parsing RESV message, energy
Access the complete routing information in main tunnel.
Similarly, the Path Options that backup tunnel uses are not loosely first destinations to R4, loose nodes R4 there is also loose
Node, i.e. R4 are the loose nodes as non-destination node, need automatically to carry routing information in signaling PATH message.
If the path of backup tunnel is L14-L24-L23, path letter will be carried in the RESV message that R1 is received
The RID of (such as: RRO) fei3/1, fei2/3, fei4/1 and node R 3, R2, R4 is ceased, R1 can obtain the complete of backup tunnel
Routing information.By comparing the routing information in main tunnel and the routing information of backup tunnel it is found that the backup tunnel have passed through
Node R 2 to be protected is needed, so FRR protection cannot be formed.
If the path of backup tunnel is L14-L43, routing information will be carried in the RESV message that R1 is received
The RID of (such as: RRO) fei3/2, fei4/1 and node R 3 and R4, R1 can obtain the complete routing information of backup tunnel.
By comparing the routing information in main tunnel and the routing information of backup tunnel it is found that the backup tunnel is to be protected not by needing
Node R 2, it is possible to form Node Protection.
In conclusion when any one tunnel is established, if having loose nodes in Path Options, and described loose
Node is not the destination node in tunnel, then automatically in signaling PATH message and RESV message carry routing information (such as
RRO), but regardless of whether there is this configuration of deployment under tunnel, so that head node be made to know for sure backup by these routing informations
Whether the path in tunnel have passed through the protected node in main tunnel and/link, to improve the reliability of TE FRR formation.
Although describing the invention in detail above, but the invention is not restricted to this, those skilled in the art of the present technique
It can be carry out various modifications with principle according to the present invention.Therefore, all to be modified according to made by the principle of the invention, all it should be understood as
Fall into protection scope of the present invention.
Claims (8)
1. a kind of method for improving TE FRR protection reliability characterized by comprising
Head node judges in backup tunnel after the routing information for determining main tunnel with the presence or absence of the pine as non-destination node
Dissipate node；
When judging to there are the loose nodes as non-destination node in the backup tunnel, head node is along the backup tunnel
The PATH message that road is used to that each node on the way is made to carry routing information in it to destination node transmission；
Head node receives destination node and responds the PATH message and inversely send along the path for transmitting the PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it；
Head node utilize the RESV message carry routing information, determine the backup tunnel whether can in main tunnel to
The node and/or link of protection carry out TE FRR protection；
The head node determines that the step of routing information in main tunnel includes:
Head node judges in main tunnel with the presence or absence of the loose nodes as non-destination node；
When judging to there are loose nodes as non-destination node in the main tunnel, head node along the main tunnel to
Destination node sends the PATH message for being used to that each node on the way is made to carry routing information in it；
Head node receives destination node and responds the PATH message and inversely send along the path for transmitting the PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it；
Wherein, TE FRR is the quick heavy-route of traffic engineering.
2. the method according to claim 1, wherein the path choosing used when head node is established using backup tunnel
, judge in the backup tunnel with the presence or absence of the loose nodes as non-destination node.
3. according to the method described in claim 2, it is characterized in that, the routing information that the PATH message carries includes described
The node identification of each node of PATH message approach and outgoing interface address, each node of PATH message approach are successively receiving
Respective node identification and outgoing interface address are carried in PATH message.
4. according to the method described in claim 3, it is characterized in that, the routing information that the RESV message carries includes described
The node identification of each node of RESV message approach and outgoing interface address, each node of RESV message approach are successively receiving
Respective node identification and outgoing interface address are carried in RESV message.
5. according to the method described in claim 4, it is characterized in that, the head node by parsing received RESV message,
Node identification and the outgoing interface address of each node of backup tunnel are obtained, and using the node identification of each node and goes out to connect
Port address, judges whether the backup tunnel passes through node and/or link to be protected in main tunnel, when judging the backup tunnel
When road is by node or link to be protected in the main tunnel, determine the backup tunnel cannot in the main tunnel wait protect
The node and/or link of shield carry out TE FRR protection.
6. method according to claim 1-5, which is characterized in that head node was used when being established using main tunnel
Path Options judge in the main tunnel with the presence or absence of the loose nodes as non-destination node.
7. a kind of device for improving TE FRR protection reliability characterized by comprising
Backup tunnel judgment module, for after the routing information for determining main tunnel, judging in backup tunnel with the presence or absence of conduct
The loose nodes of non-destination node；
Backup tunnel sending module, for when the loose nodes for judging to have as non-destination node in the backup tunnel
When, it is used to that the PATH that each node carries routing information in it on the way is made to disappear to destination node transmission along the backup tunnel
Breath；
Backup tunnel receiving module, for receiving the destination node response PATH message along the transmission PATH message
The RESV message for being used to that each node on the way is made to carry routing information in it that inversely sends of path；
FRR protects determining module, standby for carrying in the routing information using the main tunnel and the RESV message received
The routing information in part tunnel, determines whether the backup tunnel can be to node and/or link to be protected in the main tunnel
Carry out TE FRR protection；
Main tunnel judgment module, for judging in main tunnel with the presence or absence of the loose nodes as non-destination node；
Main tunnel sending module, for when judging to there are loose nodes as non-destination node in the main tunnel, edge
The main tunnel to destination node send PATH message, make on the way each node is carried in the PATH message path believe
Breath；
Main tunnel receiving module responds the PATH message and along PATH message transmission for receiving destination node
The RESV message that path is inversely sent, make on the way each node carry routing information in the RESV message；
Wherein, TE FRR is the quick heavy-route of traffic engineering.
8. device according to claim 7, which is characterized in that the backup tunnel judgment module is established using backup tunnel
When the Path Options that use, judge in the backup tunnel with the presence or absence of the loose nodes as non-destination node.
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| CN201310653294.3A CN104702501B (en) | 2013-12-05 | 2013-12-05 | A kind of method and device improving TE FRR protection reliability |
| PCT/CN2014/079640 WO2014183720A1 (en) | 2013-12-05 | 2014-06-10 | Te frr protection reliability improvement method and device, head node and storage medium |
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| WO2014183720A1 (en) | 2014-11-20 |
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