CN1859304A - Method for realizing neighbour discovery - Google Patents
Method for realizing neighbour discovery Download PDFInfo
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- CN1859304A CN1859304A CNA2006100335439A CN200610033543A CN1859304A CN 1859304 A CN1859304 A CN 1859304A CN A2006100335439 A CNA2006100335439 A CN A2006100335439A CN 200610033543 A CN200610033543 A CN 200610033543A CN 1859304 A CN1859304 A CN 1859304A
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Abstract
The present invention discloses neighbor discovery implementation method, used for realizing terminal equipment inter communicate in router accessing non-broadcast multipoint access network. It contains presetting corresponded neighbor state interface index in routing list host computer route; receiving neighbor discovery message; according to neighbor discovery message source and target IP address searching corresponded interface index in routing list, and according to interface index obtaining corresponded neighbor state; according to neighbor discovery message source and target IP address and corresponded neighbor state, to make neighbor discovery processing to received neighbor discovery message. The present invention avoids performance insufficient to and regular traffic message lose problem, raising equipment service treatment ability.
Description
Technical field
The present invention relates to data communication field, relate to the implementation method that a kind of neighbours find specifically.
Background technology
(Neighbor Discover is a kind of new agreement of searching IP address link corresponding layer address that IPV6 of future generation (Internet ProtocolVersion 6) network proposes ND) to Neighbor Discovery Protocol, and it mainly is used in the process of address resolution.
Address resolution is the process that is obtained its link layer address by neighbours' non-multicast address, and only is used for the IP address in this link.When this link range interior nodes has unicast message will send to neighbours but does not know its link layer address, with regard to enabling address resolving.
The basic principle of address resolution procedure is as follows:
For the node of interface support multicast, this node is at first created a list item in neighbor cache, and the limited multicast group to this address correspondence sends neighbor advertisement request (Neighbor Solicitation, NS) message that comprises the link layer address option then; Receive this neighbor advertisement request message as node, to this node respond neighbor advertisement (Neighbor Advertisement,, NA) message.If do not receive neighbor advertisement message that any neighbours send then the address resolution failure, the IP layer of this node can produce an ICMP, and (Internet Control Message Protocol, ICMP) unreachable message is given application layer.If receiving the node source IP address of neighbor advertisement request message is not unallocated address then learns to create or upgrade the list item of neighbor cache.
On the other hand, the Access Network part of present broadband metropolitan area network, generally be by the BAS Broadband Access Server of user terminal, Access Layer tandem equipment and convergence-level (Broadband Remote Access Server, BRAS) or the stratiform topological structure formed of the equipment of three levels such as router device.Needs for telecom operation, general different user terminal, for example PC1 among Fig. 1 and PC2, by VLAN (Virtual Local Area Network, VLAN), permanent virtual connects (Permanent VirtualConnection, PVC) etc. isolate, stop between the user without the direct communication of convergence-level equipment.In addition, Access Layer sink devices in the general broadband metropolitan area network, for example the IP Digital Subscriber Loop inserts multiple connection equipment (Digital Subscriber Line Access Multiplexer, DSLAM), to also isolating between the user who does not have VLAN, not allowing the message between the user directly not carry out two layers of interconnection by convergence-level equipment, also is that the message between different user must could be realized interconnection by the processing of three-layer equipment.
Like this, as shown in Figure 1, when the BRAS of convergence-level or router device insert virtual links such as a plurality of VLAN, PVC simultaneously under a sub-interface or directly insert a plurality of access device that can't realize L 2 broadcast, situation for the shared continuous IP address network segment of the access device under a plurality of VLAN, the PVC under the same sub-interface, because the link under this sub-interface all can't double layer intercommunication, so just can't learn link layer address mutually, therefore in the time will realizing communicating by letter between two user terminals under this sub-interface, just can't realize.So the Access Network of broadband metropolitan area network partly is exactly that a non-broadcast multipoint inserts (Non Broadcast Multi Access, network NBMA) in fact.
Because Neighbor Discovery Protocol only uses and is broadcast in the whole link by the multicast mode at this link of user, but the Access Network of the broadband metropolitan area network that Fig. 1 describes is the NBMA network, multicast message can't be broadcast to other users, therefore need BRAS equipment or router to provide neighbours to find agency's (ND Proxy) function, allow user in NBMA network can learn be routed device agency's link layer address as the agency for the user transmits the ND message thereby be BRAS equipment or router, finally realize both intercommunications.
In the prior art, router at first receives NS, NA message from the link of NBMA network insertion interface, by revising media access control (the Media Access Control of message, MAC) processing such as address realizes that router acts on behalf of this main frame, transmit the NA message to other link broadcasting NS messages or certain bar link of this interface then, thereby realize the ND message intercommunication of the multicast in the different links, solve in the above-mentioned NBMA network problem of intercommunication between the user.
Because in the prior art, hardware just receives and identifies the ND message, and Neighbor Discovery Protocol and neighbours find that the agency is to be finished by software section, and as shown in Figure 2, this has brought following problem:
1. work as BRAS equipment or router under the situation that inserts a large number of users, Neighbor Discovery Protocol and neighbours find that agent functionality will provide the message between multilink to duplicate, and allow software cause bottleneck easily, influence the stable operation of equipment;
2. when modes such as BRAS equipment or router employing Flow Control reduce the message of giving software processes, make user's message lose easily.
Summary of the invention
The technical problem that the present invention solves is to propose the implementation method that a kind of neighbours find, be used for when router inserts non-broadcast multipoint access network realizing under the mutual communication situation between terminal equipment, solve software and realize that neighbours find to handle the runnability problems that is caused, and the neighbor discovery protocol message of delivering software processes is carried out the problem that Flow Control causes user's normal message to be lost.
For addressing the above problem, the present invention proposes a kind of implementation method that realizes that when router inserts non-broadcast multipoint access network neighbours find under the mutual communication situation between terminal equipment, may further comprise the steps:
A) interface index of the neighbor state information of default respective neighbours node in routing table main frame route;
B) receive neighbours and find message;
C) find that according to neighbours the source IP address of message and purpose IP address search the corresponding respectively interface index of this source IP address and purpose IP address in routing table, and obtain corresponding respectively to the neighbor state of source IP address and corresponding to the neighbor state of purpose IP address according to interface index;
D) find the source IP address of message and purpose IP address and, received neighbours are found that message carries out neighbours and finds to handle according to neighbours corresponding to the neighbor state of source IP address with corresponding to the neighbor state of purpose IP address.
Wherein, step d) further comprises step: judge the neighbours that received find whether the source IP address of message and purpose IP address satisfy condition: source IP address is that the pairing interface index in unallocated IP address or purpose IP address is router itself or link-local address, if, then the neighbours that received are found that message carries out local neighbours and finds to handle, otherwise, the neighbours that received are found that message carries out neighbours and finds agent processes.
Wherein, described local neighbours find to handle and may further comprise the steps:
D11), judge described neighbours find whether the source IP address of message is unallocated address, if, execution in step d12), otherwise, execution in step d13);
D12), the neighbours that received are found that message carries out duplicate address detection and handles, and upgrade the state of neighbor node, finish local neighbours and find to handle;
D13), judge whether the neighbor node of source IP address correspondence exists, if, execution in step d14), otherwise, execution in step d15);
D14) be the neighbor advertisement message if the neighbours that received find message, then upgrade the Link State of source IP address institute respective neighbours node, if the neighbours that received find message and are the neighbor advertisement request messages and have the different medium accessing to control address, then respond the neighbor advertisement message, otherwise dropping packets, and finish local neighbours and find to handle;
D15), the link that acknowledges receipt of this message is the neighbor state of creating the neighbor node of source IP address correspondence behind the link on this interface, otherwise dropping packets.
Described neighbours find that agent processes then may further comprise the steps:
D21), judge described neighbours find whether the pairing neighbor node of source IP address of message exists, if, execution in step d22), otherwise, execution in step d27);
D22), judge described neighbours find whether the pairing neighbor node in purpose IP address of message exists, if, execution in step d23), otherwise, execution in step d24);
D23) be the neighbor advertisement request message if the neighbours that received find message, the neighbor node of then acting on behalf of purpose IP address correspondence sends the neighbor advertisement message to the neighbor node of source IP address correspondence, if it is the neighbor advertisement message that the neighbours that received find message, then act on behalf of the neighbor node of source IP address correspondence and transmit the neighbor advertisement message, and finish neighbours and find agent processes to the pairing neighbor node in purpose IP address;
D24), judge described neighbours find whether message is the neighbor advertisement request message, if, execution in step d25 then), otherwise execution in step d26);
D25), act on behalf of the pairing neighbor node of source IP address and in this link, broadcast this neighbor advertisement request message, finish neighbours and find agent processes;
D26) if it is the neighbor advertisement message that the neighbours that received find message, the link that then acknowledges receipt of this message is this link nodes link corresponding state that upgrades behind the link on this interface, otherwise dropping packets, and finish neighbours and find agent processes;
D27), the link that acknowledges receipt of this message is the neighbor state of creating the neighbor node of source IP address correspondence behind the link on this interface, otherwise dropping packets.
Compared with prior art, the present invention has the following advantages:
1. neighbours of the present invention find and neighbours find that the agency all can be by hardware handles, allow device software from the hard work of low " being benefited " link layer address mapping, free like this, handle even more important work, avoid software because of handling the performance deficiency that a large amount of ND messages causes, be more conducive to professional processing;
2. the present invention has also avoided the problem that the Flow Control of software causes the regular traffic message of access device to be lost simultaneously.
Description of drawings
Fig. 1 is that the broadband metropolitan area network router inserts the NBMA schematic network structure;
Fig. 2 is a prior art scheme principle schematic;
Fig. 3 is that the present invention realizes that neighbours find to act on behalf of principle schematic;
Fig. 4 is the data structure schematic diagram that invention relates to;
Fig. 5 is the main flow chart of the present invention program;
Fig. 6 is that the local neighbours of the present invention find process chart;
Fig. 7 is that neighbours of the present invention find the agent processes flow chart.
Embodiment
With reference to the accompanying drawings the preferred embodiments of the present invention are made detailed explanation below.
As described in Figure 3, neighbours of the present invention find that the implementation method of acting on behalf of mainly comprises following step:
Step 4, find the source IP address of message and purpose IP address and, received neighbours are found that message carries out neighbours and finds to handle corresponding to the neighbor state of source IP address with corresponding to the neighbor state of purpose IP address according to neighbours.
Below above step is described specifically:
At first, as shown in Figure 4, the present invention designs following data structure, in existing routing table, increase the interface index at main frame route place, can find the pairing interface IP of this interface address, all neighbor state information and the link information (for example concrete access VLAN ID tabulation etc.) of all accesses by this interface index.These data structures are kept in the hardware, but neighbor state information wherein is owing to relate to the renewal of routing iinformation, and effectively synchronous for the routing iinformation that guarantees whole system, these steps of safeguarding of the processing of neighbor state and neighbor node are handled by software.
Simultaneously, the interface hardware of router access NBMA network joins in all related multicast group of this interface automatically.
As shown in Figure 5, when router receives the message that comes from the NBMA network, interface hardware identifies effective neighbours and finds message (comprising NS message and NA message), and takes out the source IP address and the purpose IP address information of message, and does following processing according to the IP address information of neighbours' message:
Search interface index corresponding in the routing table respectively according to source IP address and purpose IP address, and search respectively corresponding to the neighbor state of source IP address with corresponding to the neighbor state of purpose IP address according to the pairing interface index of source IP address and purpose IP address.
Source IP address and purpose IP address according to message are judged, if source IP address is the interface index of unallocated address or purpose IP address correspondence to be the address of router itself or link-local then message to be carried out local neighbours find to handle,, message finds agent processes otherwise being carried out neighbours.
Concrete, local neighbours find to handle and may further comprise the steps:
11) whether the source IP address of judging message is that " unallocated address " is all zeros address, if this message is duplicate address detection (Duplicated Address Detect, DAD) message are carried out following steps 12) so, otherwise, carry out following steps 13).
12) judge according to the neighbor state of purpose IP address correspondence whether the neighbor node of purpose IP address correspondence exists.If this neighbor node does not exist, the address of carrying out duplicate address detection so is nonoverlapping IP address, and whether the link that acknowledges receipt of this message be the link on this interface, if, the corresponding neighbor state of notice software creation, otherwise dropping packets; If this neighbor node exists, whether the MAC Address of then judging message with the MAC Address difference of this interface, if act on behalf of already present neighbor node so and respond the NA message, otherwise direct dropping packets and upgrade neighbor state finishes local neighbours and handles.
13) whether the neighbor node of judging the source IP address correspondence exists, if there is execution in step 14), otherwise execution in step 15).
14) type of judgement received packet is if the NA message is so directly notified the software refreshing neighbor state, if the NS message, whether the MAC Address of judging message with the MAC Address difference of this interface, if, then respond the NA message, otherwise direct dropping packets finishes local neighbours and handles.
15) judge that whether the link receive this message is the link on this interface, if, the corresponding neighbor state of notice software creation, otherwise dropping packets.
Neighbours find that agent processes may further comprise the steps:
21) whether the neighbor node of judging the source IP address correspondence exists, if, execution in step 22), otherwise, execution in step 25).
22) whether the neighbor node of judging purpose IP address correspondence exists, if, execution in step 23), otherwise execution in step 24).
23) type of judgement received packet, if be the NS message, act on behalf of purpose IP address respective neighbours node so and directly respond the NA message to the neighbor node of source IP address correspondence, if NA message, act on behalf of the neighbor node of source IP address correspondence so and transmit the NA message to the neighbor node of purpose IP address correspondence, source MAC in the message changes the router interface MAC Address into simultaneously, finishes neighbours' agent processes.
24) judge the received packet type, if NS message and permission NS broadcasting, then act on behalf of the neighbor node of source IP address correspondence and broadcast this message to the link at this interface place, and change the source MAC of message the interface mac address of router into, if be the NA message, whether the link that acknowledges receipt of this message so is the link on this interface, if, the corresponding neighbor state of notice software creation, otherwise dropping packets finish neighbours' agent processes.
25) judge that whether the link receive this message is the link on this interface, if, the corresponding neighbor state of notice software creation, otherwise dropping packets.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. the implementation method that neighbours find is characterized in that, comprises step:
A) interface index of the neighbor state information of default respective neighbours node in routing table main frame route;
B) router receives neighbours and finds message;
C) router finds that according to neighbours the source IP address of message and purpose IP address search the corresponding respectively interface index of this source IP address and purpose IP address in routing table, and obtains corresponding respectively to the neighbor state of source IP address and corresponding to the neighbor state of purpose IP address according to interface index;
D) router is found the source IP address of message and purpose IP address and corresponding to the neighbor state of source IP address with corresponding to the neighbor state of purpose IP address, received neighbours is found that message carries out neighbours and finds to handle according to neighbours.
2. the implementation method that neighbours as claimed in claim 1 find is characterized in that, carries out neighbours in the step d) and finds that processing comprises step:
Judge the neighbours that received find whether the source IP address of message and purpose IP address satisfy condition:
Source IP address is that the pairing interface index in unallocated IP address or purpose IP address is router itself or link-local address, if, then the neighbours that received are found that message carries out local neighbours and finds to handle, otherwise, the neighbours that received are found that message carries out neighbours and finds agent processes.
3. the implementation method that neighbours as claimed in claim 2 find is characterized in that, described local neighbours find to handle and may further comprise the steps:
D11) judge described neighbours find whether the source IP address of message is unallocated address, if, execution in step d12), otherwise, execution in step d13);
D12) neighbours that received are found that message carries out duplicate address detection and handles, and upgrade the state of neighbor node, finish local neighbours and find to handle;
D13) whether the neighbor node of judging the source IP address correspondence exists, if, execution in step d14), otherwise, execution in step d15);
D14) be the neighbor advertisement message if the neighbours that received find message, then upgrade the Link State of source IP address institute respective neighbours node, if the neighbours that received find message and are the neighbor advertisement request messages and have the different medium accessing to control address, then respond the neighbor advertisement message, otherwise dropping packets, and finish local neighbours and find to handle;
D15) link that acknowledges receipt of this message is a neighbor state of creating the neighbor node of source IP address correspondence behind the link on this interface, otherwise dropping packets.
4. as the implementation method of claim 2 or 3 described neighbours' discoveries, it is characterized in that described neighbours find that agent processes may further comprise the steps:
D21) judge described neighbours find whether the pairing neighbor node of source IP address of message exists, if, execution in step d22), otherwise, execution in step d27);
D22) judge described neighbours find whether the pairing neighbor node in purpose IP address of message exists, if, execution in step d23), otherwise, execution in step d24);
D23) be the neighbor advertisement request message if the neighbours that received find message, the neighbor node of then acting on behalf of purpose IP address correspondence sends the neighbor advertisement message to the neighbor node of source IP address correspondence, if it is the neighbor advertisement message that the neighbours that received find message, then act on behalf of the neighbor node of source IP address correspondence and transmit the neighbor advertisement message, and finish neighbours and find agent processes to the pairing neighbor node in purpose IP address;
D24) judge described neighbours find whether message is the neighbor advertisement request message, if, execution in step d25 then), otherwise execution in step d26);
D25) act on behalf of the pairing neighbor node of source IP address and in this link, broadcast this neighbor advertisement request message, finish neighbours and find agent processes;
D26) if it is the neighbor advertisement message that the neighbours that received find message, the link that then acknowledges receipt of this message is this link nodes link corresponding state that upgrades behind the link on this interface, otherwise dropping packets, and finish neighbours and find agent processes;
D27) link that acknowledges receipt of this message is a neighbor state of creating the neighbor node of source IP address correspondence behind the link on this interface, otherwise dropping packets.
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