CN107786436B - VPN network and protection switching method - Google Patents
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0681—Configuration of triggering conditions
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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
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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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
- H04L45/20—Hop count for routing purposes, e.g. TTL
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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
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
Abstract
The invention discloses a VPN network and a protection switching method, and relates to the technical field of communication. The VPN network includes a VPN route protection group formed by a source node and at least two next hop nodes, and label switched paths LSPs are formed between the source node and the at least two next hop nodes, and the source node includes: the service processing module is used for creating an alarm identifier for each next hop node in the VPN route protection group, associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective; the device is also used for setting the alarm identifier associated with the LSP to be invalid when the LSP is deleted, triggering an alarm and deleting the association between the LSP and the invalid alarm identifier; and the protection group processing module is used for executing protection switching operation according to the triggered alarm when the LSP is deleted. The invention can immediately execute the protection switching operation according to the alarm, thereby reducing the service interruption time.
Description
The present invention relates to the field of communications technologies, and in particular, to a VPN network and a protection switching method.
Background
When an Internet Protocol Radio Access Network (IPRAN) or a Router configures a Virtual Router Forwarding (VRF) service, a Virtual Private Network (VPN) route is usually protected, and a plurality of remote next hops are set to form a VPNFRR (Virtual Private Network Fast ReRoute) or a VPNECMP (Virtual Private Network equivalent Multi-Path) protection. Usually, this kind of protection will configure a corresponding Detection means FOR fast detecting and monitoring the link connectivity status in the network, when the link fails, the Detection signal is used to trigger the hardware fast protection switching, and the current network failure Detection technology has end-to-end BFD (Bidirectional Forwarding Detection) or OAM (Operation Administration and Maintenance) interrupt signals, such as BFD FOR LSP (Label Switch Path) or BFD FOR IP (Internet Protocol) multi-hop to detect the reachability of the next hop at the far end.
As shown in fig. 1, there are two paths from a source NODE1 to a core network, where a next-hop NODE of one path is NODE3 and passes through intermediate NODE2, and a next-hop NODE of the other path is NODE5 and passes through intermediate NODE4, a VPNECMP or VPNFRR route protection group is formed according to a protection policy, generally, only an association relationship between a VPN route and a VPN route protection group is formed, if a VPN is configured with LSP end-to-end detection, a relationship between the VPN route protection group and a detection signal ID is established, and when a detection signal ID generates an alarm, protection switching is triggered. However, BFD or OAM is not configured in some limited scenarios, when the connection between NODE2 and NODE3 is broken or NODE2 is powered down, the LSP from NODE1 to NODE3 is deleted first, and then after the route converges, the LSP from NODE1 to NODE4, NODE5 to NODE3 is reestablished, the next hop will not change for the route, and the LSP reconverges.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a VPN network and a protection switching method, when an LSP is deleted, an alarm mark associated with the LSP is set to be invalid, an alarm is triggered, and protection switching operation is immediately executed according to the alarm, so that the service interruption time is reduced, and the rapid protection switching is realized.
The invention provides a VPN network, which comprises a VPN route protection group formed by a source node and at least two next hop nodes, wherein Label Switching Paths (LSPs) are formed between the source node and the at least two next hop nodes, and the source node comprises:
the service processing module is used for creating an alarm identifier for each next hop node in the VPN route protection group, associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective; the device is also used for setting the alarm identifier associated with the LSP to be invalid when the LSP is deleted, triggering an alarm and deleting the association between the LSP and the invalid alarm identifier;
and the protection group processing module is used for executing protection switching operation according to the triggered alarm when the LSP is deleted.
On the basis of the above technical solution, the service processing module is further configured to receive reestablishment information of the deleted LSP, reestablish association between the LSP and an alarm identifier corresponding to a next hop node according to identity information of the next hop node in the LSP, and set the associated alarm identifier to be valid.
On the basis of the technical scheme, a timer is arranged in the protection group processing module, and the timer sets a time length threshold value;
the protection group processing module is used for judging whether the duration time of the reestablished LSP reaches a set time length threshold value or not, and if so, recovering protection; if not, the service processing module sets the alarm identifier associated with the LSP to be invalid, and deletes the association between the LSP and the invalid alarm identifier.
The invention also provides a protection switching method of a VPN network, wherein the VPN network comprises a VPN route protection group formed by a source node and at least two next hop nodes, Label Switched Paths (LSPs) are formed between the source node and the at least two next hop nodes, and the method comprises the following steps:
creating an alarm identifier for each next hop node in the VPN route protection group;
associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective;
when the LSP is deleted, setting the alarm mark associated with the LSP as invalid, triggering an alarm, executing protection switching operation, and deleting the association between the LSP and the invalid alarm mark.
On the basis of the technical scheme, in the VPN route protection group, the identity information of each next hop node and the corresponding alarm identifier establish an association relationship through a HASH table or an array.
On the basis of the above technical solution, the method for associating the alarm identifier with the LSP where the corresponding next hop node is located includes: and establishing an incidence relation between the LSP and an alarm identifier corresponding to the next hop node according to the identity information of the next hop node in the LSP.
On the basis of the technical scheme, the identity information of the next hop node comprises the IP address of the next hop node, the alarm identifier corresponding to the next hop node is found by searching the IP address of the next hop node in the LSP, and the association relationship between the alarm identifier and the LSP is established.
On the basis of the above technical solution, the method for associating the alarm identifier with the LSP where the corresponding next hop node is located includes: and searching the LSP where the next hop node is located in the LSP entry according to the identity information of each next hop node in the VPN route protection group and establishing an association relationship.
On the basis of the technical scheme, the method further comprises the following steps: when the deleted LSP is reestablished, according to the identity information of the next hop node in the LSP, the association between the LSP and the alarm identifier corresponding to the next hop node is reestablished, and the associated alarm identifier is set to be effective.
On the basis of the technical scheme, judging whether the duration time of the reestablished LSP reaches a set time length threshold value, and if so, recovering the protection; if not, setting the alarm identifier associated with the LSP as invalid, and deleting the association between the LSP and the invalid alarm identifier.
Compared with the prior art, the invention has the following advantages:
(1) because the alarm identifier is associated with the LSP where the corresponding next hop node is located in advance, when the LSP is deleted, the alarm identifier associated with the LSP is set to be invalid, an alarm is triggered, the protection switching operation is immediately executed according to the alarm, and the protection switching operation is switched to the second path in the VPN route protection group, so that the service interruption time is reduced, and the rapid protection switching is realized.
(2) When the duration of the deleted LSP after reestablishment reaches the set duration threshold, the route protection is recovered, so that when the link is repeatedly interrupted due to instability, the hardware table entry can be kept in a stable state, and the repeated interruption of the service is avoided.
(3) The method for associating the alarm identifier with the LSP where the corresponding next hop node is located is flexible and efficient, the VPN route protection group and the label switching path LSP are usually generated independently, and the association relationship between the LSP and the alarm identifier corresponding to the next hop node is established according to the identity information of the next hop node in the LSP, or the LSP where the next hop node is located is searched in the LSP entry and the association relationship is established according to the identity information of each next hop node in the VPN route protection group.
Drawings
Fig. 1 is a routing of a source NODE1 to a core network;
fig. 2 is a schematic diagram of a source node in a VPN network according to an embodiment of the present invention;
fig. 3 is a flowchart of a VPN network protection switching method according to an embodiment of the present invention.
Reference numerals:
the system comprises a source node1, a service processing module 11 and a protection group processing module 12.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 2, an embodiment of the present invention provides a VPN network, where the VPN network includes a VPN route protection group formed by a source node1 and at least two next-hop nodes, and a label switched path LSP is formed between the source node1 and the at least two next-hop nodes, and the source node includes a traffic processing module 11 and a protection group processing module 12.
The service processing module 11 is configured to create an alarm identifier for each next hop node in the VPN route protection group, associate the alarm identifier with an LSP in which the corresponding next hop node is located, set the associated alarm identifier to be valid, and send the alarm identifier that is set to be valid to the protection group processing module 12 by the service processing module 11; and the method is also used for setting the alarm identifier associated with the LSP to be invalid when the LSP is deleted, triggering the alarm, and deleting the association between the LSP and the invalid alarm identifier.
The protection group processing module 12 is configured to execute protection switching operation according to the triggered alarm when the LSP is deleted.
Because the service processing module 11 associates the alarm identifier with the LSP where the corresponding next-hop node is located in advance, when the LSP is deleted, the alarm identifier associated with the LSP is set to be invalid and triggers an alarm, the protection group processing module 12 obtains the triggered alarm by polling or interruption, immediately performs protection switching operation, and switches to the second path in the VPN routing protection group, thereby reducing the service interruption time and realizing fast protection switching.
The service processing module 11 is further configured to receive information reestablished by the deleted LSP, reestablish an association between the LSP and an alarm identifier corresponding to a next-hop node according to the identity information of the next-hop node in the LSP, set the associated alarm identifier to be valid, and cancel an alarm triggered by the alarm identifier.
The protection group processing module 12 is provided with a timer, the timer sets a time length threshold, the service processing module is further configured to determine whether the duration of the reestablished LSP reaches the set time length threshold, and if so, the protection group processing module 12 recovers protection; if not, the service processing module 11 sets the alarm identifier associated with the LSP as invalid, and deletes the association between the LSP and the invalid alarm identifier.
When the duration of the deleted LSP after reestablishment reaches the set duration threshold, the route protection is recovered, so that when the link is repeatedly interrupted due to instability, the hardware table entry can be kept in a stable state, and the repeated interruption of the service is avoided.
Referring to fig. 3, an embodiment of the present invention provides a protection switching method for a VPN network, where the VPN network includes a VPN route protection group formed by a source node1 and at least two next-hop nodes, and a label switched path LSP is generated between the source node1 and the at least two next-hop nodes, and the source node1 includes a service processing module 11 and a protection group processing module 12, and the protection switching method includes:
s1, a service processing module 11 creates an alarm identifier for each next hop node in the VPN route protection group.
And S2, associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective.
The method for associating the alarm identifier with the LSP where the corresponding next hop node is located comprises the following steps: and establishing an incidence relation between the LSP and an alarm identifier corresponding to the next hop node according to the identity information of the next hop node in the LSP.
The identity information of the next hop node includes an IP address of the next hop node, and the service processing module 11 finds an alarm identifier corresponding to the next hop node by searching the IP address of the next hop node in the LSP, and establishes an association relationship between the alarm identifier and the LSP.
In the VPN route protection group, the identity information of each next hop node and the corresponding alarm identifier create an association relationship through a HASH table or an array.
Another method for performing association is as follows: and searching the LSP where the next hop node is located in the LSP entry according to the identity information of each next hop node in the VPN route protection group and establishing an association relationship.
In the VPN network, normally, the VPN route protection group and the label switched path LSP are generated separately, and if the VPN route protection group is generated first and the LSP is generated after configuration, the alarm identifier corresponding to the next hop node is looked up in the relationship table created in step S1 according to the identity information of the next hop node in the LSP, and the LSP is associated with the alarm identifier corresponding to the next hop node after finding the alarm identifier. If the LSP configuration is generated firstly, when the VPN route protection group configuration is generated, each next hop node in the VPN route protection group is searched in the generated LSP entry, and the LSP is associated with the alarm identifier corresponding to the next hop node after the LSP is found. Therefore, regardless of the generation sequence of the VPN route protection group and the label switched path LSP, it is possible to flexibly and efficiently ensure that the alarm flag is associated with the LSP in which the corresponding next hop node is located.
And when the VPN route protection group is deleted, removing the association relation between the alarm identification and the next hop.
And S3, when the LSP is deleted, setting the alarm identifier associated with the LSP as invalid, triggering an alarm, executing protection switching operation, and deleting the association between the LSP and the invalid alarm identifier.
Specifically, when a failure such as connection interruption or node power failure occurs, the LSP in which the failure occurs is deleted through route convergence. The service processing module 11 receives the message that the LSP is deleted, and the service processing module 11 sets the alarm identifier associated with the LSP as invalid, deletes the association between the LSP and the invalid alarm identifier, and triggers an alarm.
The protection group processing module 12 obtains the triggered alarm through polling or interruption, and executes the protection switching operation. Specifically, the protection group processing module 12 periodically queries whether there is a warning identifier set to be invalid to the service processing module 11, or after the service processing module 11 sets the warning identifier associated with the LSP to be invalid, sends the invalid warning identifier to the protection group processing module 12. The protection group processing module 12 identifies the next hop node corresponding to the failed alarm identifier as failed, and performs hardware table entry processing, thereby triggering service flow direction switching.
Because the alarm identifier is associated with the LSP where the corresponding next hop node is located in advance, when the LSP is deleted, the alarm identifier associated with the LSP is set to be invalid, an alarm is triggered, the protection switching operation is immediately executed according to the alarm, and the protection switching operation is switched to the second path in the VPN route protection group, so that the service interruption time is reduced, and through the processing, the rapid protection switching can be realized even if end-to-end detection such as BFD (bidirectional forwarding detection) is not set.
The protection switching method also comprises the following steps:
and S4, when the deleted LSP is reestablished, reestablishing the association between the LSP and the alarm identifier corresponding to the next hop node according to the identity information of the next hop node in the LSP, setting the associated alarm identifier to be effective, and sending the alarm identifier which is set to be effective to the protection group processing module 12 by the service processing module 11.
Specifically, after the connection is interrupted or the node is powered off and other faults are repaired, the originally deleted LSP is reestablished through route convergence, the service processing module 11 receives the LSP reestablishment message, reestablishes the association between the LSP and the alarm identifier corresponding to the next hop node according to the IP address of the next hop node in the LSP, and sets the associated alarm identifier to be valid.
The protection switching method also comprises the following steps:
s5, judging whether the duration time of the reestablished LSP reaches a set time length threshold value or not, and if so, recovering the protection; if not, setting the alarm identifier associated with the LSP as invalid, and deleting the association between the LSP and the invalid alarm identifier.
The protection group processing module 12 receives the valid alarm identifier from the service processing module 11, the timer in the protection group processing module 12 starts timing, and when the timer reaches the set time threshold, the protection group processing module 12 performs protection switching by setting the next hop node identifier corresponding to the alarm identifier as valid according to the set valid alarm identifier, thereby recovering the service flow direction.
When the timer has not reached the set time threshold, the service processing module 11 receives the information that the reestablished LSP is deleted, sets the alarm identifier associated with the LSP to fail, deletes the association between the LSP and the failed alarm identifier, resets the timer to zero, and maintains the current service flow direction switching.
When the duration of the deleted LSP after reestablishment reaches the set duration threshold, the route protection is recovered, so that when the link is repeatedly interrupted due to instability, the hardware table entry can be kept in a stable state, and the repeated interruption of the service is avoided.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (7)
1. A VPN network for use in scenarios where BFD or OAM is not configured; the VPN network includes a VPN route protection group formed by a source node and at least two next hop nodes, and a label switched path LSP is formed between the source node and each of the at least two next hop nodes, wherein the source node includes:
the service processing module is used for creating an alarm identifier for each next hop node in the VPN route protection group, associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective; the device is also used for setting the alarm identifier associated with the LSP to be invalid when the LSP is deleted, triggering an alarm and deleting the association between the LSP and the invalid alarm identifier;
a protection group processing module, configured to execute a protection switching operation according to the triggered alarm when the LSP is deleted;
the method for associating the alarm identifier with the LSP where the corresponding next hop node is located comprises the following steps:
establishing an incidence relation between the LSP and an alarm identifier corresponding to a next hop node according to the identity information of the next hop node in the LSP; the identity information of the next hop node comprises an IP address of the next hop node, an alarm identifier corresponding to the next hop node is found by searching the IP address of the next hop node in the LSP, and an association relation between the alarm identifier and the LSP is established; or
And searching the LSP where the next hop node is located in the LSP entry according to the identity information of each next hop node in the VPN route protection group and establishing an association relationship.
2. The VPN network according to claim 1, wherein: the service processing module is further configured to receive reestablished information of the deleted LSP, reestablish an association between the LSP and an alarm identifier corresponding to a next hop node according to identity information of the next hop node in the LSP, and set the associated alarm identifier to be valid.
3. The VPN network according to claim 2, wherein: a timer is arranged in the protection group processing module, and the timer sets a time length threshold value;
the protection group processing module is used for judging whether the duration time of the reestablished LSP reaches a set time length threshold value or not, and if so, recovering protection; if not, the service processing module sets the alarm identifier associated with the LSP to be invalid, and deletes the association between the LSP and the invalid alarm identifier.
4. A protection switching method of VPN network is used in the scene without BFD or OAM configuration; the VPN network includes a VPN route protection group formed by a source node and at least two next-hop nodes, and Label Switched Paths (LSPs) are formed between the source node and the at least two next-hop nodes, wherein the method comprises:
creating an alarm identifier for each next hop node in the VPN route protection group;
associating the alarm identifier with the LSP where the corresponding next hop node is located, and setting the associated alarm identifier to be effective;
when the LSP is deleted, setting the alarm identifier associated with the LSP as invalid, triggering an alarm, executing protection switching operation, and deleting the association between the LSP and the invalid alarm identifier;
the method for associating the alarm identifier with the LSP where the corresponding next hop node is located comprises the following steps:
establishing an incidence relation between the LSP and an alarm identifier corresponding to a next hop node according to the identity information of the next hop node in the LSP; the identity information of the next hop node comprises an IP address of the next hop node, an alarm identifier corresponding to the next hop node is found by searching the IP address of the next hop node in the LSP, and an association relation between the alarm identifier and the LSP is established; or
And searching the LSP where the next hop node is located in the LSP entry according to the identity information of each next hop node in the VPN route protection group and establishing an association relationship.
5. The protection switching method of a VPN network according to claim 4, wherein: in the VPN route protection group, the identity information of each next hop node and the corresponding alarm identifier create an association relationship through a HASH table or an array.
6. The protection switching method for VPN network according to claim 4, wherein said method further comprises: when the deleted LSP is reestablished, according to the identity information of the next hop node in the LSP, the association between the LSP and the alarm identifier corresponding to the next hop node is reestablished, and the associated alarm identifier is set to be effective.
7. The protection switching method for a VPN network according to claim 6, wherein: judging whether the duration time of the reestablished LSP reaches a set time length threshold value or not, and if so, recovering the protection; if not, setting the alarm identifier associated with the LSP as invalid, and deleting the association between the LSP and the invalid alarm identifier.
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