CN1988476A - Method and device for self adaptive quick loop detection and loop blocking - Google Patents
Method and device for self adaptive quick loop detection and loop blocking Download PDFInfo
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- CN1988476A CN1988476A CN 200610125496 CN200610125496A CN1988476A CN 1988476 A CN1988476 A CN 1988476A CN 200610125496 CN200610125496 CN 200610125496 CN 200610125496 A CN200610125496 A CN 200610125496A CN 1988476 A CN1988476 A CN 1988476A
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Abstract
The invention involves a method and a device for adaptively fast detecting loop circuit and interdiction, in which, the key is continuous detection whether to receive its own data packets sent to the Ethernet in each port. If the data packet is detected, it will be discarded and the port is set to obstruction state for blocking the loop circuit, limiting the broadcast and proliferation of broadcasting storm in the Ethernet, and avoiding influence to the other normal data operations. In the invention, there is no CPU, the visit to source MAC address of control layer and a 12-bit VLAN ID logo by medium of 48-bit Ethernet frames sent and received on the port, as a key information, its logic operation, learning, searching, comparison and so on, enhance adaptability and speed of loop detection and prevention, without occupying network bandwidth and effecting the normal network data transmission.
Description
Technical field
The present invention relates to Ethernet Circle and detect and the interrupter technique field, particularly the method and the device of the blocking-up of quick loop detection of self adaptation and loop.
Background technology
Development along with local area network (LAN), the user is more and more by the Ethernet switch access network, the problem that the installation local area network (LAN) occurs often mainly is that network forms loop, connecting the single line cable in some cases mistakenly, just can make whole network paralysis, there is one in situation shown in Fig. 1 a and Fig. 1 b from encircling head on an Ethernet switch, perhaps exist from ring head or loop situation on the Ethernet switch of this Ethernet exchange cascade or bridge.Under above-mentioned two kinds of networking situations, PC all exists can not be normally and the possibility of server communication.Under the situation of Fig. 1 a, when PC and server communication, begin to send an ARP broadcasting packet, behind the arrival equipment, equipment can be with the MAC address learning of PC to the port PO RT1 of switch.Therefore simultaneously, this broadcasting packet can be broadcasted in double layer network, can deliver to connect from the port PO RT6 of ring head and connect on the port PO RT8 of server.Owing to connect one on the port PO RT6 from encircling head, so this message can intactly send back on the port PO RT6.Because the source MAC in the message is the MAC Address of PC, like this, will cause the MAC Address of PC to move on the PORT6 from port PO RT1.After the message of the clean culture ARP of server response is delivered to switch, according to two layers of exchange principle, find out port by the purpose mac addressing, will find port PO RT6, then message is seen off from port PO RT6.Like this, PC just can not have been communicated by letter normally with server.The situation of Fig. 1 b and Fig. 1 a are that similarly loopback or loop situation are present in the switch of cascade.The study mistake that can cause MAC Address is equally interrupted normal network communication.The situation of Fig. 1 b more approaches actual network condition.More be difficult to find and the location.This loopback situation is catastrophic for double layer network, and double layer network is big more, and coverage is big more.Take place for fear of this situation, must adopt loop detecting method, utilize loop detection can find whether there is this situation in the network, solve a problem promptly accurately.In order to detect loopback and the blocking-up loopback that exists in the network, all require to have on the equipment CPU that is used as management and transmitting-receiving message at present mostly.Fig. 2 traditional detects the method schematic diagram that has loopback in the network based on CPU transmitting-receiving message mode, as shown in Figure 2, loop detection is undertaken by CPU transmitting-receiving message, CPU is by sending a kind of special message on the port of equipment, and detect this message and whether can send back from the port that sends, determine whether there is the loopback situation on this port.When having the loopback situation under certain port on the link, the detection messages that sends from this port must send back to the CPU of this equipment from this port; The detection messages of sending from certain port as CPU can not send back to this port of this equipment, can confirm that then loopback does not exist under this port.Because network is an object that all might have change at any time, therefore loop detection is a lasting process, that is to say, on equipment, need to carry out at interval at regular intervals one-time detection, determine whether there is loopback on each port, and found to exist situations such as whether loopback has disappeared on the port of loopback last time.
From above-mentioned to detect the analysis of the loop-back process that whether exists the network based on CPU transmitting-receiving message mode, its maximum shortcoming is as can be seen: in order to detect the loop in the double layer network, need to add on the equipment CPU, for family and small enterprise, forbidding really and also may be with high costs, carry out one-time detection simultaneously at regular intervals at interval, on each port, transmit and receive telegrams, determine whether there is loopback on each port, can take certain bandwidth of each port like this, can exert an influence some normal flows.
Summary of the invention
The method and the device that the purpose of this invention is to provide the blocking-up of quick loop detection of a kind of self adaptation and loop, can be in double layer network quick detection loop and the blocking-up loop of self adaptation, avoid the influence of broadcast storm and do not take the bandwidth of port, the cost that makes equipment simultaneously is with low.
Technical scheme of the present invention is:
The method of quick loop detection of a kind of self adaptation and loop blocking-up, carry out according to the following steps: source MAC, VLAN ID identification number and the port numbers of the media access control layer of the ethernet frame that (1) input unit will receive and send from port, flow to computing unit, computing unit is configured to one with source MAC, VLANID identification number and the port numbers addition of the media access control layer of ethernet frame to have the key message of specific bit position and flows to arithmetic logic unit, unit and comparison control unit; (2) arithmetic logic unit is to the logical operation of the parallel redundancy circulation CRC-10 of the key message work that obtains, and the allocation index value that obtains a key information table flows to unit and searches the unit; (3) unit constitutes key information table automatically according to the key message and the allocation index value of gained; (4) search the allocation index value of unit according to gained, search and constitute list item corresponding with it in the key information table, the key message that obtains in the list item flows to the comparison control unit, the key message that the comparison control unit will obtain in the list item compares with the key message that obtains from computing unit, as identical, illustrate that then loop has appearred in the network under this port, with this data packet discarding that receives, and the diffusion of blocking-up broadcast storm, the influence of loop is limited in this network below port, if inequality, then this packet does not abandon, and does normal the forwarding and handles.
The device of quick loop detection of a kind of self adaptation and loop blocking-up, comprise input unit, computing unit, arithmetic logic unit, unit, search unit, comparison control unit, it is characterized in that: send input unit successively with computing unit, arithmetic logic unit, arithmetic logic unit respectively with unit with search the unit and link to each other, unit and search the unit link to each other between interconnection, search the unit and link to each other with control unit relatively; Input unit is used to extract source MAC, VLAN ID identification number and the port numbers of the media access control layer of the ethernet frame that receives from port; Computing unit is used for the source MAC with the media access control layer of ethernet frame, and VLAN ID identification number and port numbers addition are configured to a key message with specific bit position; Arithmetic logic unit is used for the key message that obtains is done the logical operation of parallel redundancy circulation CRC-10, obtains the allocation index value of a key information table; Unit is used for constituting key information table automatically according to described key message and allocation index value; Searching the unit is used for according to resulting allocation index value, search and constitute list item corresponding with it in the key information table, obtain the key message in the list item, relatively control unit is used for the key message that obtains of list item is done parallel comparison with given key message, according to result relatively, carry out corresponding operational processes.
Also comprise timer units, timer units links to each other with unit, and timer units is used for the list item burin-in process of key information table, according to the time interval of setting, make the list item in the key information table can periodically refresh the variation of self-adapting network topology one by one automatically.
In unit, be connected into timer units, list item in the key information table is carried out burin-in process, concrete steps are sent out following: start timer units when unit constitutes key information table automatically according to the key message of gained and allocation index value, write down every list item already present time in table; Judge that whether corresponding list item surpasses setting-up time, as surpass, delete,, then keep as not surpassing; If the packet of the list item correspondence of deletion is also sending, then this list item also can be learnt, and as not existing, then can be replaced by other new list item, this process is called refreshing of list item, and the information in the table can constantly be upgraded automatically according to the variation of network topology.
Owing to adopted technique scheme, compared with prior art, the present invention has following beneficial effect:
The present invention adopts the source MAC of the media access control layer of the ethernet frame that will receive and send from port, VLAN ID identification number and port numbers, be configured to a key message with specific bit position, do the logical operation of parallel redundancy circulation CRC-10, form key information table, according to the list item of key information table and the key message that obtains relatively, judge under this port whether loop exists and to its loop blocking-up.Whether this method exists the method for loopback different with traditional detecting in the network based on CPU transmitting-receiving message mode, its main distinction is: in the past, most message mode that adopts CPU to send out specific, the present invention does not send specific message, do not need CPU, but the source MAC of the media access control layer of the normal ethernet frame that sends and receive on the employing port, VLAN ID identification number and port numbers are as basis for estimation, the source MAC of the media access control layer of the ethernet frame that will send from port, VLAN ID identification number and port numbers, be configured to a key message with specific bit position, this key message is done logical operation, obtain the allocation index value of key information table, then given key message is write in the list item of index value correspondence, and pass through aging mechanism, list item in the key information table is refreshed periodically automatically, the variation of self-adapting network topology, the source MAC of the media access control layer of the ethernet frame that will receive from port simultaneously, VLAN ID identification number and port numbers, be configured to a key message with specific bit position, this key message is done logical operation, obtain the allocation index value of key information table, search the corresponding with it list item of key information table according to index value, the key message of the list item that obtains, whether the key message of judging list item is identical with given key message, as identical, then with this data packet discarding, as inequality, then packet does not abandon.
The present invention adopts the source MAC, VLAN ID identification number and the port numbers that send on the port and receive to form key information table and judge the foundation that occurs loop under the port as key message, is the logical operation of redundant circulation CRC-10 do logical operation to key message.Its advantage is to make that loop can detect fast on the network, and blocking-up, can adapt to the variation of network topology automatically, does not take the bandwidth of port simultaneously, also can reduce the cost of two layers of ethernet device.
Description of drawings
Fig. 1 is the schematic diagram of the loopback that exists in the network.
Fig. 2 is traditional method schematic diagram based on the loopback that exists in the CPU transmitting-receiving message mode detection network.
Fig. 3 is the method schematic diagram of quick loop detection of self adaptation of the present invention and blocking-up.
Fig. 4 is the method flow diagram of quick loop detection of the self adaptation in the embodiment of the invention and blocking-up.
Fig. 5 is the device block diagram of quick loop detection of self adaptation of the present invention and blocking-up.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Fig. 3 is the schematic flow sheet of the method for quick loop detection of self adaptation of the present invention and blocking-up.
As shown in Figure 3, thinking of the present invention is: when port sends packet, with the source MAC that it comprised, vlan table number of showing and port numbers are obtained, constitute the key message of one 60 bit, with this redundancy circulation CRC-10 logical operation that this keyword is walked abreast, logical operation obtains the allocation index value of 10 bit results as key information table, the key message of correspondence is write in the list item of allocation index value correspondence, promptly depositing a width in is 64, the degree of depth is in 1024 the table, this process is called learning process, constitute one 64 * 1024 key information table, every list item in the table has write down the source MAC that sends bag and the vlan identifier information of this port correspondence; Simultaneously when every list item generates, start timer, write down every list item already present time in table,, delete surpassing the list item of setting-up time, if the packet of the list item correspondence of deletion is also sending, then this list item also can be learnt, and as not existing, then can be replaced by other new list item, this process is called refreshing of list item, and the information in the table can constantly be upgraded automatically according to the variation of network topology; Characteristics according to Ethernet, the packet that sends from the port is the characteristics that can not get back to the port, and characteristics such as the uniqueness of source MAC, when port is received packet, source MAC, the vlan table number of showing and port numbers that it comprised are obtained, constitute the key message of one 60 bit, the redundancy circulation CRC-10 logical operation that this keyword is walked abreast, logical operation obtains the allocation index value of 10 bit results as key information table, obtain its list item corresponding in key information table according to the address index value, this process becomes searches; After finding corresponding list item, itself and the key message that obtains are compared, if it is identical, illustrate that then loop has appearred in the network under this port, with this data packet discarding that receives, the diffusion of blocking-up broadcast storm, the influence of loop is limited in this network below port, if inequality, then this packet does not abandon, and does normal the forwarding and handles.Wherein the keyword of 60 bits is by { VLAN_ID+MAC} constitutes, and what the logical operation of redundant circulation CRC-10 was adopted is Parallel CRC-10 computing of 64 bits, and the generator polynomial of CRC-10 is C (x)=x
10+ x
9+ x
5+ x
4+ x+1.
The list item number of the key information table in the present embodiment can have 64 * 1024 at most, based on the characteristics of real network and the cost performance of system equipment, can be set to 64 * 4K or 64 * 8K by the list item number.
Fig. 4 is the schematic flow sheet of the method for quick loop detection of the self adaptation in the embodiment of the invention and blocking-up.As shown in Figure 4, concrete operations step comprises:
A, when port sends packet, source MAC, the vlan table number of showing and port numbers that it comprised are obtained, constitute the key message of one 60 bit;
B, with the redundancy circulation CRC-10 logical operation that this keyword walks abreast, logical operation obtains the allocation index value of 10 bit results as key information table;
C, corresponding key message write in the list item of allocation index value correspondence, promptly depositing a width in is 64, the degree of depth is in 1024 the table, to constitute one 64 * 1024 key information table, and every list item in the table has write down the source MAC that sends bag and the vlan identifier information of this port correspondence;
D, while start timer when generating at every list item, write down every list item already present time in table;
E, judge that whether corresponding list item surpasses setting-up time, the time range of setting is 60 seconds to 600 seconds, can set according to the needs of network, as surpass, delete,, then keep as not surpassing, if the packet of the list item correspondence of deletion is also sending, then this list item also can be learnt, and as not existing, then can be replaced by other new list item, this process is called refreshing of list item, and the information in the table can constantly be upgraded automatically according to the variation of network topology
F, when port is received packet, source MAC, the vlan table number of showing and port numbers that it comprised are obtained, constitute the key message of one 60 bit;
G, with the redundancy circulation CRC-10 logical operation that this keyword walks abreast, logical operation obtains the allocation index value of 10 bit results as key information table;
H, obtain its list item corresponding in key information table according to the address index value, this process becomes searches;
I, find corresponding list item after, itself and the key message that obtains are compared, if it is identical, illustrate that then loop has appearred in the network under this port, with this data packet discarding that receives, the diffusion of blocking-up broadcast storm, the influence of loop is limited in this network below port, if inequality, then this packet does not abandon, and does normal the forwarding and handles.
Source MAC and VLAN ID identification number according to receive and send packet on port repeat above-mentioned A to the I operating procedure, can finish the detection and the blocking-up operation of loop.
The device of quick loop detection of a kind of self adaptation and loop blocking-up, as shown in Figure 5, comprise input unit, computing unit, arithmetic logic unit, unit, search unit, comparison control unit, timer units, send input unit successively with computing unit, arithmetic logic unit, arithmetic logic unit respectively with unit with search the unit and link to each other, unit and search the unit link to each other between interconnection, search the unit and link to each other with control unit relatively; Timer units links to each other with unit, and input unit is used to extract source MAC, VLAN ID identification number and the port numbers of the media access control layer of the ethernet frame that receives from port; Computing unit is used for the source MAC with the media access control layer of ethernet frame, and VLAN ID identification number and port numbers addition are configured to a key message with specific bit position; Arithmetic logic unit is used for the key message that obtains is done the logical operation of parallel redundancy circulation CRC-10, obtains the allocation index value of a key information table; Unit is used for constituting key information table automatically according to described key message and allocation index value; Searching the unit is used for according to resulting allocation index value, search and constitute list item corresponding with it in the key information table, obtain the key message in the list item, relatively control unit is used for the key message that obtains of list item is done parallel comparison with given key message, according to result relatively, carry out corresponding operational processes; Timer units links to each other with unit, and timer units is used for the list item burin-in process of key information table, in the time interval according to setting, makes the list item in the key information table can periodically refresh the variation of self-adapting network topology one by one automatically.
Claims (4)
1, the method for quick loop detection of a kind of self adaptation and loop blocking-up, carry out according to the following steps: source MAC, VLANID identification number and the port numbers of the media access control layer of the ethernet frame that (1) input unit will receive and send from port, flow to computing unit, computing unit is configured to one with source MAC, VLANID identification number and the port numbers addition of the media access control layer of ethernet frame to have the key message of specific bit position and flows to arithmetic logic unit, unit and comparison control unit; (2) arithmetic logic unit is to the logical operation of the parallel redundancy circulation CRC-10 of the key message work that obtains, and the allocation index value that obtains a key information table flows to unit and searches the unit; (3) unit constitutes key information table automatically according to the key message and the allocation index value of gained; (4) search the allocation index value of unit according to gained, search and constitute list item corresponding with it in the key information table, the key message that obtains in the list item flows to the comparison control unit, the key message that the comparison control unit will obtain in the list item compares with the key message that obtains from computing unit, as identical, illustrate that then loop has appearred in the network under this port, with this data packet discarding that receives, and the diffusion of blocking-up broadcast storm, the influence of loop is limited in this network below port, if inequality, then this packet does not abandon, and does normal the forwarding and handles.
2, method according to claim 1, it is characterized in that: in unit, be connected into timer units, list item in the key information table is carried out burin-in process, concrete steps are sent out following: start timer units when unit constitutes key information table automatically according to the key message of gained and allocation index value, write down every list item already present time in table; Judge whether corresponding list item surpasses setting-up time, and the time range of setting is 60 seconds to 600 seconds, as surpasses, and deletes, and as not surpassing, then keeps; If the packet of the list item correspondence of deletion is also sending, then this list item also can be learnt, and as not existing, then can be replaced by other new list item, this process is called refreshing of list item, and the information in the table can constantly be upgraded automatically according to the variation of network topology.
3, the device of quick loop detection of a kind of self adaptation and loop blocking-up, comprise input unit, computing unit, arithmetic logic unit, unit, search unit, comparison control unit, it is characterized in that: send input unit successively with computing unit, arithmetic logic unit, arithmetic logic unit respectively with unit with search the unit and link to each other, unit and search the unit link to each other between interconnection, search the unit and link to each other with control unit relatively; Input unit is used to extract source MAC, VLANID identification number and the port numbers of the media access control layer of the ethernet frame that receives from port; Computing unit is used for the source MAC with the media access control layer of ethernet frame, and VLANID identification number and port numbers addition are configured to a key message with specific bit position; Arithmetic logic unit is used for the key message that obtains is done the logical operation of parallel redundancy circulation CRC-10, obtains the allocation index value of a key information table; Unit is used for constituting key information table automatically according to described key message and allocation index value; Searching the unit is used for according to resulting allocation index value, search and constitute list item corresponding with it in the key information table, obtain the key message in the list item, relatively control unit is used for the key message that obtains of list item is done parallel comparison with given key message, according to result relatively, carry out corresponding operational processes.
4, the device of quick loop detection of self adaptation according to claim 3 and loop blocking-up, it is characterized in that: also comprise timer units, timer units links to each other with unit, timer units is used for the list item burin-in process of key information table, according to the time interval of setting, make the list item in the key information table can periodically refresh the variation of self-adapting network topology one by one automatically.
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| CN 200610125496 CN100479387C (en) | 2006-12-19 | 2006-12-19 | Method and device for self adaptive quick loop detection and loop blocking |
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