CN1901481A - Method for judging spring grouping ring topology stability - Google Patents

Method for judging spring grouping ring topology stability Download PDF

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Publication number
CN1901481A
CN1901481A CNA2005100854101A CN200510085410A CN1901481A CN 1901481 A CN1901481 A CN 1901481A CN A2005100854101 A CNA2005100854101 A CN A2005100854101A CN 200510085410 A CN200510085410 A CN 200510085410A CN 1901481 A CN1901481 A CN 1901481A
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China
Prior art keywords
topology
stability
crc value
changes
alarm
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CNA2005100854101A
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Chinese (zh)
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CN100466559C (en
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郭红健
李振刚
周峰轮
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State Grid Shanghai Electric Power Co Ltd
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ZTE Corp
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Abstract

This invention relates to a judgment method for stability of spring packet ring topology including the following steps: a topology timing module sends test information of topology stability to a topology information receiving and processing module in every other period of time, which calls a state test machine of the stability of topology to process it to compute the CRC value of the current topology list and compare with the CRC value of the last period to judge if the topology has changed, which can test the stability topology of spring packet ring effectively.

Description

A kind of method of judging spring grouping ring topology stability
Technical field
The present invention relates to the determination methods of a kind of RPR (Resilient Packet Ring, Resilient Packet Ring) topological stability, more particularly, is the method for judging spring grouping ring topology stability in a kind of Ethernet switch equipment.
Background technology
Ieee standard draft P802.17 has provided the using method and the physical layer specification of Resilient Packet Ring.Resilient Packet Ring is a kind of metropolitan area network technology of supporting with transfer of data between the interconnected website of dicyclo configuration, because it has functional characteristics such as Topology Discovery, Loop Protection, allocated bandwidth and has obtained increasing concern and application in communication technique field.
Resilient Packet Ring has the opposite loop of both direction, and each website on the ring is periodically broadcasted at a slow speed topology protection control frame or broadcasting topology protection control frame fast when detecting topology and change.Each website upgrades topology table and the ring option table of safeguarding separately according to the topology protection control frame that receives on the ring, if having the fault point on the ring, then will form the protection border in topology table.
Business Stream selects one of them loop to transmit according to the ring option table under the normal condition, when website or certain loop break down on the ring, the ring option table that upgrades in time is realized business recovery fast with guide service auto switching before arriving the fault point to available loop.
Ieee standard draft P802.17/D3.3 has provided several key features that Resilient Packet Ring is different from other network interconnection technologies, wherein when website or link occurs fault the business recovery time below 50ms, yet unsettled topology will cause professional frequently switching, influence greatly network performance, therefore topology is unstable is listed in one of fault in IEEE draft P802.17/D3.3.
Provided a kind of method that topological stability is judged of carrying out in topological validity check state machine in the draft, used two timers: topology is stablized timer and topological unstable timer.Topology Protection analysis state machine is analyzed the Topology Protection that receives, if the Source Site is invalid in current topology table, the address changes MAC (media interviews control) or boundary condition changes, and shows that all variation has taken place topology.Topology validity check state machine is triggered and changes the START state over to, and two timers are set identical starting point, change the UNSTABLE state again over to.In this state of UNSTABLE, as long as topology changes, topology is stablized timer and all will be set new starting point.If topology does not change, and it is overtime that topology is stablized timer, explanation topology in the sufficiently long time does not change, provide the stable indication of topology, state machine changes the STABLE state over to, carry out follow-up validity check, have only the topological Shi Caihui that changes once more to trigger and change the judgement of stability that the START state begins a new round over to; If topology changes, when the renewal topology is stablized timer, the change in topology sign is made as FALSE, if before topology is stablized timer expiry, unstable timer expiry, explanation topology in the sufficiently long time never enters stable state, provides topological unsettled faulty indication.
The stable timer default timeout value that draft provides is 40ms, and unstable timer default timeout value is 10s.This method relates to the maintenance of two state machines and two timers, and operability is relatively poor.Wherein Topology Protection analysis state machine need compare frame information and current topological list item, provides the sign of topology change; Whether stable and another checks the state machine of topological validity need be according to the sign of topology change, upgrade timer or provide topology indication behind timer expiry, has certain problem on operating efficiency; In addition, this method has certain dependence, causes under the situation of change in topology in local physical link fault, and website can not receive Topology Protection immediately, so topological stability can not effectively be detected.
Summary of the invention
The objective of the invention is to propose a kind of easy to operate and spring grouping ring topology stability determination methods efficiently.
The handling process of a kind of method of judging spring grouping ring topology stability of the present invention is as follows:
1. topological time block sends the topological stability detect-message every predetermined period to topological message sink processing module, and topological message sink processing module is called topological stability detected state machine and handled;
2. topological stability detected state machine adopts CRC (the Cyclic RedundancyCheck that error detection occurs generally adopts in the communication system, cyclic redundancy check (CRC)) algorithm calculates the crc value of current topology table, compared with the crc value of last one-period, and judged with this whether topology changed.Next cycle still changes if topology changes the back, illustrates that topology is unstable, provides warning information; Otherwise, if current C RC value is consistent with last one-period, illustrated that topology was stable, before if exist alarm then with alarm clearance.
Adopt the method for the invention; can effectively detect the stability of spring grouping ring topology; operate simple and easy; avoid safeguarding a plurality of timers; and do not rely on analysis to the topology protection control frame that receives; judge that therefore the change in topology that causes for local physical link fault also can effectively detect but spontaneously the site-local topology table is carried out periodicity analysis.
Description of drawings
Fig. 1 is the handling process of the method for the invention.
Fig. 2 is the state transition diagram of topological stability detected state machine of the present invention.
Embodiment
Below in conjunction with accompanying drawing, substantially be described in further detail according to the enforcement of the order of accompanying drawing to technical scheme:
Fig. 1 is the total Message Processing flow chart of the method for the invention.Topology time block timed sending topological stability detect-message; the Link State detection module sends link failure message when link occurs fault, topology protection agreement control frame receiver module then sends topology protection control messages after receiving relevant control frame.Topology message sink processing module is handled respectively these message, changes different handling processes over to according to different type of messages.For the topological stability detect-message that time block sends, topological message sink processing module changes the Detection of Stability state machine over to and handles; Other message are then called other relevant treatment flow processs and are handled.
The state transitions of topological stability detected state machine as shown in Figure 2.The state machine normal operating conditions is idle (IDLE), and topology is stablized no change.The crc value that adopts more current topology table in state machine and the method for the crc value of last cycle topology table judge whether current topology and the topology in last processing cycle be consistent, thereby know topological variation.
At idle (IDLE) state, if crc value changes (illustrating that change has taken place topology), state changes pre-alarm (PRE_ALARM) over to; If crc value constant (illustrating that topology does not change), state keeps idle (IDLE) constant, and with existing alarm clearing.
At pre-alarm (PRE_ALARM) state, if crc value changes (illustrating that change has taken place topology once more), provide topological unsettled fault warning, state changes alarm (ALARMED) over to; If crc value constant (tending towards stability after change in topology is described), state changes the free time (IDLE) over to, and with existing alarm clearing.
At alarm (ALARMED) state, if crc value changes (after the unstable alarm of topology is described change having taken place again), state keeps alarm (ALARMED) constant; If crc value constant (tending towards stability after the unstable alarm of topology is described), state changes the free time (IDLE) over to, and with existing alarm clearing.
Wherein the CRC-16 algorithm has been adopted in the calculating of crc value; the topology table of station maintenance is calculated crc value as data block, and topology table comprises that each website MAC (media interviews control) address, validity, the jumping figure apart from this website, transmeridional protection (East and West direction refers to the both sides of certain website) and boundary condition, accessibility indicate the field of topological state.
The spring grouping ring topology stability determination methods that the present invention proposes, using topological message sink processing module regularly to carry out topological stability detects, the unstable alarm of topology is complained to or removed to the crc value of topology table as the foundation of judging change in topology, again according to topology variation situation.The method of the invention does not rely on analysis to each Topology Protection that receives to the judgement of topological stability; but the crc value of judgement topology table; cause in time to receive under the situation of Topology Protection and also can effectively detect to have the characteristics of operation simple and efficient in the link-local fault.

Claims (5)

1, a kind of method of judging spring grouping ring topology stability comprises following processing:
The topology time block sends the topological stability detect-message every predetermined period to topological message sink processing module, and topological message sink processing module is called topological stability detected state machine and handled;
Calculate the crc value of current topology table, compared, judge with this whether topology changes with the crc value of last one-period.
2, judge the method for spring grouping ring topology stability according to claim 1, it is characterized in that:
The cyclic redundancy check (CRC) algorithm that error detection occurs generally adopts in the topological stability detected state machine employing communication system calculates the crc value of current topology table.
3, as the method for judgement spring grouping ring topology stability as described in the claim 2, it is characterized in that:
The topology table of station maintenance is calculated crc value as data block, and topology table comprises that each website MAC Address, validity, the jumping figure apart from this website, East and West direction protection and boundary condition, accessibility indicate the field of topological state.
4, judge the method for spring grouping ring topology stability according to claim 1, it is characterized in that:
Next cycle still changes if topology changes the back, illustrates that topology is unstable, provides warning information; Otherwise, if current C RC value is consistent with last one-period, illustrated that topology was stable, before if exist alarm then with alarm clearance.
5, as the method for judgement spring grouping ring topology stability as described in the claim 4, it is characterized in that:
In idle condition, if crc value changes, state changes pre-alarm over to; If crc value is constant, it is idle that state keeps, and with existing alarm clearing,
At pre-alarm state, if crc value changes, provide topological unsettled fault warning, state changes alarm over to; If crc value is constant, state changes the free time over to, and with existing alarm clearing,
At alarm status, if crc value changes, state keeps alarm constant; If crc value is constant, state changes the free time over to, and with existing alarm clearing.
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CN102413031A (en) * 2011-12-28 2012-04-11 杭州华三通信技术有限公司 RPR (Resilient Packet Ring) fault protection method and equipment
CN102413031B (en) * 2011-12-28 2015-09-23 杭州华三通信技术有限公司 A kind of RPR fault protecting method and equipment thereof

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