CN104125148B - Defect sensing and route entry refreshing method for three-layer Ethernet ring - Google Patents
Defect sensing and route entry refreshing method for three-layer Ethernet ring Download PDFInfo
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- CN104125148B CN104125148B CN201410394933.3A CN201410394933A CN104125148B CN 104125148 B CN104125148 B CN 104125148B CN 201410394933 A CN201410394933 A CN 201410394933A CN 104125148 B CN104125148 B CN 104125148B
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Abstract
The invention discloses a defect sensing and route entry refreshing method for a three-layer Ethernet ring. The defect sensing and route entry refreshing method for the three-layer Ethernet ring includes: a node topology address list in a right-transmitting left-receiving order is formed; a three-layer detection message is constructed for every node, and three-layer forwarding is performed by every node repeatedly; defects are sensed according to the fact that whether the three-layer detection message is received within set time or not; when time is over, defect detection messages are transmitted to every node by the corresponding node, responses are given by the nodes receiving the defect detection messages, and specific defect positions are calculated by starting from the current node according to the response situations; SPF (storage protect feature) source node address information is introduced into a route forwarding entry of a routing list generated by an IGP (interior gateway protocol), and the affected route entries are refreshed. The defect sensing and route entry refreshing method for the three-layer Ethernet ring has the advantages that specific nodes on the Ethernet ring are not related to the route entries, quick sensing and swithing for any node defect of the three-layer Ethernet ring are realized under the condition that traffic access is needless to know, full-link redundancy protection configuration is not required, and protection switching configuration complexity of the three-layer Ethernet ring can be lowered effectively.
Description
Technical field
The present invention relates to Ethernet ring protection switching is and in particular to the defect of three layers of Ethernet ring perceives and route entry refreshing side
Method.
Background technology
Ethernet ring protection switching (ERP) can to operator provide similar to SDH environmental protection protective function, and still retain with
The feature of the too high performance-price ratio of net.At present, industry has had some preferable solutions, such as chain for Ethernet ring protection switching
The monocyclic salvos such as the RPR ring of road level, two floor ring RRPP protections, Wrapping and Steering of transmission field.But, on
Stating correlative link protection scheme has its applicable scene, such as just for particular physical link, or can only solve two layers of protection, or
Need to rely on static labels deployment realization etc., also there is no the preferably overall Routing Protocol Fast Convergent solving full IP shellring net
And the solution switched, reason is：
(1) using IGP Routing Protocol, complete IP shellring net typically safeguards that ring route information instructs flow to forward, holds thereon
The MPLS business such as the VPN carrying and tunnel in some scenarios, needs the Fast Convergent relying on IGP to realize LDP, LSP and is switched fast
And then trigger the fast quick-recovery of business；
(2) on ring, website is more, and on ring, the entrance of three laminar flow amounts may not know it is impossible to or be difficult to for every on ring simultaneously
Each service deployment at individual station redundancy scheme such as FRR end to end, now only can lead to business switching to reduce by three more slowly by IGP convergence
The reliability of layer ring bearer traffic.
Content of the invention
The technical problem to be solved is how to realize the Routing Protocol Fast Convergent of full IP shellring net and fall
The problem changed.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is to provide a kind of lacking of three layers of Ethernet ring
Fall into perception and route entry method for refreshing, comprise the following steps：
Step A10, the topological address that sequentially forms receiving a west to the east of the node address information of topological for ring each node arrange
Table, and the east orientation in each node of ring topology arranges an east orientation access interface, west is to one west of setting to access interface；
Step A20, ring topology each node on construct three Layer Detection messages respectively, three Layer Detection messages are from origination node
Begin through east orientation access interface to send, successively three Layer Detection messages are carried out by node each on ring and forward, finally from start node
West return to start node to access interface, and go round and begin again along ring forward；
Step A30, each node setting overtime timer, the startup time-out timing when sending probe messages in ring topology
Device, and according to whether receive the three Layer Detection message perception faults that node itself originates in the time-out time setting；
Step A40, with along the ring each node of topology for origination node respectively from its east orientation and west to access interface simultaneously along ring
Send carrying out flaw detection message to each node, each node carries out response after receiving carrying out flaw detection message, then according to each origination node
Receive the situation of response, carry out fault location；
Step A50, by SPF source node address information introduce IGP protocol generation routing table routing forwarding entry, according to
From upper ring to the list information of the forward node of lower ring and the fault location information of node on the ring, refresh is affected flow by this fault
Route entry, complete routing switch.
In the above-mentioned methods, the east orientation of node each in step A10 is arranged an east orientation access interface, west is to setting one
A ring access interface pair is bound to access interface in individual west, and arranges corresponding address information；
Wherein, east orientation access interface is used for when network is normal sending transmission carrying out flaw detection report when probe messages or network failure
Literary composition；West is used for during network failure sending carrying out flaw detection message to access interface.
In the above-mentioned methods, in step A20, the destination address of described three Layer Detection messages is to connect with respective nodes east orientation
The direct-connected next hop address connecing of incoming interface；The ring upper node of topology after its west receives three Layer Detection messages to access interface,
Changing described three Layer Detection message destination addresses is and this direct-connected next hop address connecing of node east orientation access interface to continue to do three
Layer independently forwards along ring.
In the above-mentioned methods, in step A20, each node does not do ttl value for described three Layer Detection messages and certainly subtracts according to jump
Operation.
In the above-mentioned methods, in step A30, when in ring topology, each node receives this node by its west to access interface
When the three Layer Detection messages originating are not timed-out, intervalometer resets；Otherwise this origination node triggering overtime timer time-out, to feel
Know fault；
And each node identifies whether to be by this node by carrying source node address information in three Layer Detection messages
Originate.
In the above-mentioned methods, in step A40, the positioning of fault comprises the following steps：
Step A41, when origination node triggering time-out after, from this node east orientation and west to loop topology direct-link node simultaneously
Send carrying out flaw detection message；
Each node in step A42, ring topology responds flaw detection echo message after receiving carrying out flaw detection message immediately, and with
When this carrying out flaw detection message is sent to adjacent next-hop device along endless path；
Step A43, origination node to flaw detection echo message, calculate and draw abort situation and described according to the thing two receiving
Fault is link failure or node failure.
In the above-mentioned methods, the upper each node of ring topology needs according to the ring topological address list information initially setting up to described
Carrying out flaw detection message is transmitted.
In the above-mentioned methods, in step A50, the route entry not affected by described fault does not need to refresh.
Traditional end-to-end protection mode generally requires clear and definite access point, sets up redundancy tunnel in specified point-to-point transmission and implements to protect
Shield, on non-designated 2 points access common discharge then cannot implement protect, if on ring to be accomplished each point all formed active and standby
Protection relation, then between requiring two-by-two all configuring redundancy protection, in practical operation often due to node numerous, configuration to address according to
The reason such as rely heavier and complexity tunnel resource be limited simultaneously cannot implement, the present invention, with node concrete on ring and route entry
Unrelated, being not required in the case that clear and definite flow accesses it is achieved that shellring net arbitrary node fault quick sensing, and perceive effect
High, each station of rate is switched and is directly needed not move through the renewal of Link State hop-by-hop, thus can realize looped network and quickly switch, and need not do
Which website full link redundancy relaying configuration, access from without clear and definite flow in advance, can effectively reduce the protection of shellring net
Switch configuration complexity.
Brief description
The defect perception of three layers of Ethernet ring that Fig. 1 provides for the present invention and route entry method for refreshing flow chart
The loop network topology structure schematic diagram that Fig. 2 provides for the present invention；
The fault location flow chart that Fig. 3 provides for the present invention；
Fig. 4 is the schematic diagram that link failure occurs between looped network node D and E shown in Fig. 2 in the present invention；
Fig. 5 is the schematic diagram that in the present invention, looped network node D shown in Fig. 2 breaks down：
Fig. 6 is routing switch schematic diagram after the generation of ring network fault shown in Fig. 2 in the present invention.
Specific embodiment
The defect perception of the three layers of Ethernet ring present invention being provided with reference to Figure of description and route entry refresh
Method is described in detail.
As shown in figure 1, three layers of Ethernet ring defect cognitive method that the present invention provides comprise the following steps：
Step A10, the topological address that sequentially forms receiving a west to the east of the node address information of topological for ring each node arrange
Table, arranges an east orientation access interface in the east orientation of each node of ring topology, west is to one west of setting to access interface；By east orientation
A ring access interface pair is bound to access interface in access interface and west, and arranges corresponding address information for it.
As shown in Fig. 2 its address list of A node is：A(1.1.1.1/32)-B-C-D-E-F-A；East orientation access interface is
A1, west to access interface be A2, then east orientation access interface A1 and west to access interface A2 binding this ring access interface to for
(A1-A2)；Wherein, east orientation access interface A1 is used for when network is normal sending transmission carrying out flaw detection when probe messages or network failure
Message, west is used for during network failure sending carrying out flaw detection message to access interface A2.
Step A20, ring topology each node on construct three Layer Detection messages respectively, three Layer Detection messages are from origination node
Begin through east orientation access interface to send, successively three Layer Detection messages are carried out by node each on ring and forward, finally from start node
West return to start node to access interface, and go round and begin again along ring forward.
The encapsulation of three Layer Detection messages is contemplated that application expansion type, three Layer Detection message destinatioies in IP option
Location is and this direct-connected next hop address connecing of node east orientation access interface.The upper node of ring topology is received to access interface from its west
To after three Layer Detection messages, changing its destination address is and this direct-connected next hop address connecing of node east orientation access interface, continues
Do three layers to forward along ring.
Taking A node as a example, as shown in figure 1, A node by A2 access interface after F node receives three Layer Detection messages, repair
Change the next hop address that this message destination address is A1 interface：And continue three layers and be forwarded to B node 10.1.1.2,.
When typically probe messages circulate three layers of forwarding on ring, ttl value forwards requirements certainly can subtract according to jumping according to three layers, up to
For 0, but, in the present invention, each node is not TTL from the operation subtracting for above-mentioned special three Layer Detection messages.
The probe messages sending along ring can verify three layers of transfer capability of each node on ring under normal circumstances, by checking
Direct-connected next-hop routing capabilities check the agreement that each IGP agreement is relied on to set up basic three layers of transfer capability；Due to indefinite tool
The node on the ring of body or link can produce fault, and therefore under normal circumstances, on ring, each node all can independently send this probe messages.
Step A30, each node setting overtime timer, the startup time-out timing when sending probe messages in ring topology
Device, and according to whether receive the three Layer Detection message perception faults that node itself originates in the time-out time setting.
Wherein, described fault includes node failure and link failure two class situation.
Fault perception is as follows：
In ring topology, on each node, overtime timer TM is set, time-out time is T；
When this node starts overtime timer when east orientation access interface sends probe messages；
When in ring topology, each node, in time T, receives, to access interface, three Layer Detections that this node originates by its west
Message, then intervalometer replacement；If not receiving the three Layer Detection messages that this node originates, this origination node in time T
Triggering overtime timer TM time-out is to perceive fault.
After all nodes all start three Layer Detection messages and send, each node passes through to carry source node ground in probe messages
Location information is identifying whether to be that this section is lighted and originated the message sending.
Step A40, with along the ring each node of topology for origination node respectively from its east orientation and west to access interface simultaneously along ring
Send carrying out flaw detection message to each node, each node carries out response after receiving carrying out flaw detection message, then according to each origination node
Receive the situation of response, extrapolate concrete abort situation.
On looped network, each node reaches the path of certain purpose route two, can be excellent after Routing Protocol calculates
Select one, when certain one malfunctions on ring, because routing convergence is slower, entering in flow cannot rapidly, directly on link point
Connect to perceive corresponding route next jump unreachable, therefore, after node triggering time-out, need to pick out on ring which node or which
Section link failure, to trigger fast route convergence.
As shown in figure 3, fault location specifically includes as the important step of shellring net arbitrary node fault quick sensing
Following steps：
Step A41, when origination node triggering time-out after, from this node east orientation and west to loop topology direct-link node simultaneously
Send carrying out flaw detection message and (again may be by applying for that the corresponding carrying out flaw detection message of IP option definition of extension and response are returned
Sound message)；
Each node in step A42, ring topology responds flaw detection echo message after receiving carrying out flaw detection message immediately, and with
When this carrying out flaw detection message is sent to adjacent next-hop device along endless path.
In the present invention, the transmission of this carrying out flaw detection message can not rely on common route, because the sensing of common route is
By optimal route selection generate it is impossible to ensure necessarily to traverse the upper each node of ring topology in order, so the upper each section of ring topology
Point needs the ring topological address list information according to initially setting up to be transmitted；
, according to the address list of this node taking node C as a example：C-D-E-F-A-B-C：
When receiving from the carrying out flaw detection message of B, this message is continued to be sent to D after responding by C；
When receiving from the carrying out flaw detection message of D, this message is continued to be sent to B after responding by C；
Step A43, origination node to flaw detection echo message, calculate and draw abort situation according to the thing two receiving.
With reference to Fig. 4, Fig. 5 to link failure occurring in actual networking and node failure illustrates respectively.
A. link failure：
As shown in Figure 4, if：
East orientation：A<->B、B<->C、C<->D all can reply echo flaw detection message；
West to：A<->F、F<->E can also reply echo flaw detection message；
Then E is believed that according to the ring-network topology set up before<->Link existing problems between D.
B. node failure：
As shown in Figure 5, if：
East orientation：A<->B、B<->C can reply echo flaw detection message；
West to：A<->F、F<->E can also reply echo flaw detection message；
Then it is believed that D node has fault according to the ring-network topology set up before.
According to said method, the abort situation of this ring of location aware that each node can be all originating point in this node on ring.
Step A50, by SPF source node address information introduce IGP protocol generation routing table routing forwarding entry, according to
From upper ring to the list information of the repeater station of lower ring and the fault location information of node on the ring, refresh is affected flow by this fault
Route entry, complete routing switch.
After quick sensing fault, the route entry being relied on rapidly is brushed by ring topology upper each node as needed
Newly.For Link State type Routing Protocol, rely on LSA hop-by-hop and flood link-state information, form Link State
Data base, and the tree structure centered on this node is formed by SPF algorithm；And calculate forwarding for instructing of generation at present
Route entry information then contains only destination information and next hop information, do not comprise relied on link information, therefore
Need traditional routing entry is adjusted expansion, realize and the SPF link association relying on.
Accordingly switch for picking out central link or node failure which route entry may being produced to affect and trigger, realize
Route entry is improved to the routing table of IGP protocol generation with the SPF link association relying on, the present invention, by SPF source node ground
Location information introduces routing forwarding entry, as follows：
Traditional routing forwarding entry：
| Destination address | Next hop address |
Routing forwarding entry after improvement：
| Destination address | Next hop address | SPF source node address |
After increased relied on SPF source node address information, then each route entry on each website on ring is formed
One directed arc, the topology information of join protection ring, you can to draw the link point list information that this directed arc is passed through, knot
Close the fault location information of node on the ring, when the link breaking down or website fall in this list collection, then this fault is to this
Route entry produces impact, needs corresponding route entry is refreshed；Otherwise then continue to forward it is not necessary to refresh.
In the present invention, when for this forwarding entry, ind endless path breaks down, this entry is not need to be cut
Changing it is only necessary to switch the route entry that those relied on forward-paths break down.
Meanwhile, the IGP agreement of each node all retains corresponding hypo-optimal route in study, perceives after entry is affected
Outgoing interface is flushed to contrary suboptimum next-hop outgoing interface corresponding with current interface ring direction by triggering, completes routing switch.
In 6 couples of present invention, ring network fault occurs the way of escape to be specifically described by protection switching process below in conjunction with the accompanying drawings.
As shown in Figure 6：
For A node destination be 100.0.0.1 route entry, next-hop walks F website, and SPF source node is D station
Point, i.e. this flow ring from A station, ring from D station；
For A node destination be 200.0.0.1 route entry, next-hop walks B website, and SPF source node is D station
Point, i.e. this flow ring from A station, ring from D station；
Then when A node judges E<->During D link failure, the process action to above-mentioned two class routes is as follows：
The directed edge that route entry relies on breaks down.
Entry 100.0.0.1/24 relies on A->F->E->D, will be refreshed, and be switched to suboptimum next-hop path A->B->C->
D.
The directed edge that route entry relies on does not break down.
Entry 200.0.0.1/24 relies on A->B->C->D, will not be refreshed.
So far, whole shellring net defect perception and protection switching process complete, due to above-mentioned flow process perception efficiency high, each station
Switch and directly need not move through the renewal of Link State hop-by-hop, thus looped network can be realized and quickly switch, and it is superfluous to do full link
Which website remaining relaying configuration, access from without clear and definite flow in advance.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the knot made under the enlightenment of the present invention
Structure changes, and every have same or like technical scheme with the present invention, each falls within protection scope of the present invention.
Claims (8)
1. the defect perception of three layers of Ethernet ring and route entry method for refreshing are it is characterised in that comprise the following steps：
Step A10, sequentially form ring topological address list by send out to the east of the node address information of upper for ring topology each node that west receives,
And the east orientation in each node of ring topology arranges an east orientation access interface, west is to one west of setting to access interface；
Step A20, ring topology each node on construct three Layer Detection messages respectively, three Layer Detection messages are from the beginning of origination node
Sent by east orientation access interface, three Layer Detection messages are carried out by the upper each node of ring topology successively according to ring topological address list and turns
Send out, finally return to start node from the west of start node to access interface, and go round and begin again along ring forwarding；
Step A30, in ring topology, each node arranges overtime timer, starts overtime timer when sending probe messages, and
According to whether receiving the three Layer Detection message perception faults that node itself originates in the time-out time setting；
Step A40, according to ring topological address list, with along each node of ring topology for origination node respectively from its east orientation and west to connecing
Incoming interface simultaneously circumferentially each node send carrying out flaw detection message, each node carries out response, then after receiving carrying out flaw detection message
Receive the situation of response according to each origination node, carry out fault location；
Step A50, by SPF source node address information introduce IGP protocol generation routing table routing forwarding entry, according to flow
From upper ring to the list information of the forward node of lower ring and the fault location information of node on the ring, refresh the road being affected by this fault
By entry, complete routing switch.
2. the method for claim 1 it is characterised in that by the east orientation access interface of node each in step A10 and west to
Access interface binds a ring access interface pair, and arranges corresponding address information；
Wherein, east orientation access interface is used for when network is normal sending transmission carrying out flaw detection message when probe messages or network failure；
West is used for during network failure sending carrying out flaw detection message to access interface.
3. the method for claim 1 is it is characterised in that in step A20, the destination address of described three Layer Detection messages
It is the direct-connected next hop address connecing with respective nodes east orientation access interface；The upper node of ring topology is received to access interface from its west
To after three Layer Detection messages, changing described three Layer Detection message destination addresses is that node east orientation access interface is direct-connected connects down with this
One jump address, continues to do three layers independently forwarding along ring.
4. the method for claim 1 is it is characterised in that in step A20, each node is directed to described three Layer Detection messages
Do not do ttl value according to jump from the operation subtracting.
5. the method for claim 1 is it is characterised in that in step A30, when in ring topology each node pass through its west to
When access interface receives the three Layer Detection messages that this node originates and is not timed-out, intervalometer resets；Otherwise this origination node triggering
Overtime timer time-out, to perceive fault；
And each node identifies whether to be to be originated by this node by carrying source node address information in three Layer Detection messages.
6. the method for claim 1 it is characterised in that in step A40 the positioning of fault comprise the following steps：
Step A41, when origination node triggering time-out after, send to loop topology direct-link node from this node east orientation and west simultaneously
Carrying out flaw detection message；
Each node in step A42, ring topology responds flaw detection echo message after receiving carrying out flaw detection message immediately, and will simultaneously
This carrying out flaw detection message is sent to adjacent next-hop device along endless path；
Step A43, origination node to flaw detection echo message, calculate and draw abort situation and described fault according to the thing two receiving
It is link failure or node failure.
7. method as claimed in claim 6 is it is characterised in that the upper each node of ring topology needs according to the ring topology initially setting up
Address list information is transmitted to described carrying out flaw detection message.
8. the method for claim 1 is it is characterised in that in step A50, the route bar not affected by described fault
Mesh does not need to refresh.
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| CN104506427B (en) * | 2014-12-15 | 2018-06-08 | 北京智谷睿拓技术服务有限公司 | More new control method and update control apparatus |
| CN113992570B (en) * | 2021-09-23 | 2023-11-03 | 新华三信息安全技术有限公司 | Message forwarding method and device |
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