CN103248720A - Method and device for inquiring physical address - Google Patents
Method and device for inquiring physical address Download PDFInfo
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- CN103248720A CN103248720A CN2012100315248A CN201210031524A CN103248720A CN 103248720 A CN103248720 A CN 103248720A CN 2012100315248 A CN2012100315248 A CN 2012100315248A CN 201210031524 A CN201210031524 A CN 201210031524A CN 103248720 A CN103248720 A CN 103248720A
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Abstract
The invention discloses a device and a method for inquiring a physical address. The method comprises the following steps: starting address analyses protocol snooping (ARPSnooping) and dynamic host configuration protocol snooping (DHCPSnooping) by a provider edge device to respectively snoop ARP message and DHCP message, so as to obtain a source IP address, a source MAC address and input port information from the messages, and then correspondingly saving in a built ARPSnooping table or DHCPSooping table; and inquiring a destination IP address of an ARP request broadcasting passage from the ARPSnooping table or the DHCPSnooping table when the snooped ARP message is the ARP request broadcasting passage by the PE, and when the destination IP address is obtained through inquiry, feeding the MAC address corresponding to the destination IP address back to a sender of the ARP request broadcasting message.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of method and device of inquiring about physical address.
Background technology
It is a kind of based on MPLS, connection-oriented grouping tranmission techniques transmitting multiprotocol label switching (T-MPLS).T-MPLS has cancelled functional characteristic with L3 relevant with the IP route among the MPLS, and its equipment realizes satisfying operator to the demand of low-cost and jumbo next-generation packet network.T-MPLS has followed existing thought based on circuit switching transmission net, adopts architectural framework, management and the operational mode identical with it.T-MPLS can support various Packet Services and Circuit Service.
ARP (Address Resolution Protocol, address resolution protocol) is to be the agreement of ethernet mac address (Media Access Control Address or title physical address) with the IP address resolution.In local area network (LAN), the IP datagram literary composition must encapsulate framing and could send by physical network, therefore the physical address of receiving station must be known by dispatching station, when main frame or other network equipment have data will send to another main frame or equipment, it sends by the physics net after the local ARP table of inquiry finds corresponding MAC at first according to the other side's network layer address (being the IP address); If do not have corresponding entry in the local ARP table, the ARP agreement will send ARP request broadcast packet and inquire its MAC Address to having this IP address of host, send in order to finish data.
In Elan or Etree network based on T-MPLS, CE (ustomer premises access equipment) links to each other with PE (provider edge equipment) by AC, and then realizes interconnected between CE by PW (pseudo-line), and PW is carried by the tunnel that PE and P (operator's equipment) set up.When Client (client) initiates the ARP broadcast request, need copy the ARP request to all PW by AC, can cause ARP broadcasting to take the ample resources in tunnel like this, cause performance to descend.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and device of inquiring about physical address, can reduce ARP request broadcasting packet taking tunnel resource.
For solving the problems of the technologies described above, a kind of method of inquiring about physical address of the present invention comprises:
Provider edge equipment (PE) enabling address analysis protocol is intercepted (ARP Snooping) and DynamicHost and agreement is set is intercepted (DHCP Snooping), intercept ARP message and DHCP message respectively, from the message that listens to, obtain source IP address, medium access control (MAC) address, source and the ingress port information of message, and correspondingly be saved in the ARP Snooping table or DHCP Snooping table of foundation;
When described PE is ARP request broadcasting packet at the ARP message that listens to, the purpose IP address of the described ARP request of inquiry broadcasting packet from described ARP Snooping table and/or DHCP Snooping table, when inquiring described purpose IP address, the MAC Address of described purpose IP address correspondence is returned to the transmit leg of described ARP request broadcasting packet.
Further, also comprise:
Described PE is not when inquiring described purpose IP address, send described ARP request broadcasting packet to all of the port, and when receiving the arp response broadcasting packet of described ARP request broadcasting packet correspondence, obtain MAC Address and the ingress port information of described purpose IP address correspondence, and be saved in the described ARPSnooping table.
Further, also comprise:
Described PE is when inquiring described purpose IP address, whether the ingress port information of also judging described purpose IP address correspondence is identical with the ingress port information of described ARP request broadcasting packet, if inequality, then the MAC Address with described purpose IP address correspondence returns to the transmit leg that described ARP asks broadcasting packet.
Further, also comprise:
Described PE upgrades corresponding IP address in described DHCP Snooping table when receiving the dhcp broadcast protocol massages of change IP address; And,
When the ARP data message of the change MAC Address that receives client (Client) broadcasting, in described ARP Snooping table, upgrade corresponding MAC Address, perhaps, when the overtime inefficacy of the MAC Address of client, send ARP request broadcasting packet to all of the port, and behind the arp response broadcasting packet that receives described client transmission, upgrade corresponding MAC Address.
Further, also comprise:
When described PE is ARP request broadcasting packet at the ARP message that listens to, whether the purpose IP address of also judging described ARP request broadcasting packet is this PE its own IP address, if not, then from described ARP Snooping table and/or DHCP Snooping table, inquire about the purpose IP address that described ARP asks broadcasting packet.
Further, a kind of device of inquiring about physical address comprises: message is intercepted unit, address table maintenance unit and address lookup unit, wherein:
Described message is intercepted the unit, being used for the enabling address analysis protocol intercepts (ARP Snooping) and DynamicHost and agreement is set intercepts (DHCP Snooping), intercept ARP message and DHCP message respectively, from the message that listens to, obtain source IP address, medium access control (MAC) address, source and the ingress port information of message;
Described address table maintenance unit, the ARP Snooping table and the DHCP Snooping that are used for setting up show, described message is intercepted source IP address, source MAC and the ingress port information that the unit obtains, correspondingly be saved in ARP Snooping table or the DHCP Snooping table;
Described address lookup unit, be used for intercepting ARP message that the unit listens to when being ARP request broadcasting packet at described message, the purpose IP address of the described ARP request of inquiry broadcasting packet from described ARP Snooping table and/or DHCP Snooping table, when inquiring described purpose IP address, the MAC Address of described purpose IP address correspondence is returned to the transmit leg of described ARP request broadcasting packet.
Further, also comprise packet sending unit, wherein:
Described packet sending unit is used for when described query unit does not inquire described purpose IP address, sends described ARP request broadcasting packet to all of the port;
Described message is intercepted the unit, also is used for obtaining MAC Address and the ingress port information of described purpose IP address correspondence when receiving the arp response broadcasting packet of described ARP request broadcasting packet correspondence;
Described address table maintenance unit, the MAC Address and the ingress port information that also are used for message is intercepted the described purpose IP address correspondence that the unit obtains are saved in described ARP Snooping table.
Further, described address lookup unit, also be used for when inquiring described purpose IP address, whether the ingress port information of judging described purpose IP address correspondence is identical with the ingress port information of described ARP request broadcasting packet, if inequality, then the MAC Address with described purpose IP address correspondence returns to the transmit leg that described ARP asks broadcasting packet.
Further, described address table maintenance unit also is used for intercepting the unit when receiving the dhcp broadcast protocol massages of change IP address at described message, upgrades corresponding IP address in described DHCP Snooping table; And, when described message is intercepted the ARP data message of the change MAC Address that the unit receives client (Client) broadcasting, in described ARP Snooping table, upgrade corresponding MAC Address, perhaps, when the overtime inefficacy of the MAC Address of client, the notice packet sending unit sends ARP request broadcasting packet to all of the port, and intercepts after the unit receives the arp response broadcasting packet that described client sends at described message, upgrades corresponding MAC Address.
Further, described address table maintenance unit, also be used for when the ARP message that listens to is ARP request broadcasting packet, whether the purpose IP address of judging described ARP request broadcasting packet is the PE its own IP address, if not, then from described ARP Snooping table and/or DHCP Snooping table, inquire about the purpose IP address that described ARP asks broadcasting packet.
In sum, the present invention is obtaining by the DHCP protocol dynamic in the L2VPN network of host IP address, for the PE equipment based on T-MPLS provides a kind of function that can enable the ARP rapid answer at AC, reduce the tunnel resource that ARP request broadcasting packet takies, save the bandwidth that transmits net, reduce the influence of ARP request broadcasting packet.
Description of drawings
Fig. 1 is the flow chart of method of the inquiry physical address of present embodiment;
Fig. 2 sets up the schematic diagram of process for the DHCP Snooping table of present embodiment;
Fig. 3 sets up the schematic diagram of process for the ARP Snooping table of present embodiment;
Fig. 4 is the schematic diagram of the ARP rapid answer process of present embodiment;
Fig. 5 is the schematic diagram of the amended processing of user's MAC address of present embodiment;
Fig. 6 is the Organization Chart of device of the inquiry physical address of present embodiment.
Embodiment
In L2VPN (Layer 2 virtual private network) equipment, realize the mapping between a plurality of AC interfaces and a plurality of PW by VPN, form data and transmit the basin for two layers.For the up ARP broadcasting packet that reduces the AC port copies to PW, present embodiment starts DHCP Snooping (DynamicHost arranges agreement and intercepts) and ARP Snooping broadcasting packet listening functions such as (address resolution protocol are intercepted) in the basin perimeter of VPN, set up DHCP Snooping list item and ARP Snooping list item, up ARP broadcasting packet at the AC port, at first search local DHCP Snooping list item and ARP Snooping list item, if find corresponding record then directly reply, and no longer to PW copy broadcast message, thereby avoid ARP broadcasting packet taking tunnel resource.
As shown in Figure 1, the method for the inquiry physical address of present embodiment comprises:
Step 101:PE starts listening functions such as DHCP Snooping and ARP Snooping, and according to the packet that listens to, obtain source IP address, source MAC, source vlan and the ingress port information of message, generate corresponding DHCP Snooping table and ARP Snooping table;
When step 102:PE is ARP request broadcasting packet at the ARP message that listens to, the purpose IP address of inquiry ARP request broadcasting packet from ARPSnooping table and/or DHCP Snooping table, when inquiring purpose IP address, the MAC Address of purpose IP address correspondence is returned to the transmit leg of ARP request broadcasting packet.
Can dispose Client ARP data message to the free change MAC Address of the whole network broadcasting after revising MAC Address in the present embodiment.PE upgrades corresponding MAC Address in ARP Snooping table when receiving the ARP data message of change MAC Address.
PE if the purpose IP address of ARP request broadcasting packet is the IP address of this PE, does not then carry out the inquiry of purpose IP address when receiving ARP request broadcasting packet, handled by the ARP characteristic.The purpose IP address of ARP request broadcasting packet is the IP address of PE, the inquiry of expression ARP request broadcasting packet be the MAC Address of direct-connected PE, therefore, need not to carry out the inquiry of purpose IP address at ARP Snooping table and/or DHCP Snooping table.
If the purpose IP address of ARP request broadcasting packet is not the IP address of PE, then show according to the purpose IP address search DHCP Snooping in the message, if search successfully, but the ingress port information that comprises in the list item that finds is consistent with the information of the port of receiving ARP request broadcasting packet, and port is ethernet port, then do not reply, otherwise reply immediately.If port information is identical, represent that then list item from the VPN identical with ARP request broadcasting packet, therefore, need not to reply.
If search failure, then continue to search ARP Snooping table, if search successfully, but the ingress port information that comprises in the list item that finds is consistent with the information of the interface of receiving ARP request broadcasting packet, and port is ethernet port, does not then reply, otherwise replys immediately.
If two tables are all searched failure, then directly transmit ARP request broadcasting packet all PW ports in the basin.
In ARP Snooping table and DHCPSnooping table, all start list item record ageing time, if in ageing time, do not receive corresponding (ARP or DHCP) broadcasting packet, then this entry deletion from table.
Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.
(1) foundation of DHCP Snooping list item:
As shown in Figure 2, wherein dotted line is ARP request broadcasting packet, solid line is the arp response broadcasting packet, after Client A starts, can send the broadcasting packet of dynamic IP application to DHCP Server, as shown in phantom in FIG., can make response to request after the DHCP Serve distributing IP address, at the PE of VPN1, VPN2 and VPN3 inside by the broadcasting packet of the dynamic IP application intercepting Client A and send and the response message of DHCP Serve, can be in DHCP Snooping TBL, set up the table record item 1 of the corresponding relation of IP address ip _ A of ClientA and MAC.
(2) foundation of ARP Snooping list item:
As shown in Figure 3, when Client B need send packet to Client C, owing to do not have the entry of IP address ip _ C correspondence of Client C in the local ARP table of Client B, therefore, must obtain to send message behind the MAC earlier by the MAC of ARP request broadcasting packet inquiry Client C.After ARP request broadcasting packet arrives VPN1, the ARP Snooping of VPN1 at first records the IP of Client B and MAC and obtains entry 2 among the ARP Snooping TBL, VPN1 finds there is not corresponding entry by inquiry IP_C in the DHCPSnooping table afterwards, and then search ARP Snooping and show, also do not have relevant entries, this moment, it can send ARP request broadcasting packet to other all ports.ARP request broadcasting packet is to VPN2, after the ARP Snooping of VPN2 listens to this ARP request broadcasting packet, obtain the entry 2 in the ARP Snooping TBL table, and with this broadcasting packet to the broadcasting of all AC port, Client C finds that purpose IP is oneself after receiving this broadcasting packet, so the MAC with oneself responses to this ARP request broadcasting, reply and arrive the record 3 that obtains behind the VPN2 in the ARP Snooping TBL table, in like manner reply broadcast packet and arrive the record 3 that obtains behind VPN1 and the VPN3 in the ARP Snooping TBL table.
(3) ARP request rapid answer:
As shown in Figure 4, when Client D will send packet to Client A, owing to do not have the entry of IP address ip _ A correspondence of Client A in the local ARP table of Client D, therefore must obtain to send message behind the MAC earlier by the MAC of ARP request broadcasting packet request Client A.After ARP request broadcasting packet arrives VPN3, VPN3 finds that by inquiry IP_A in DHCP Snooping table corresponding entry is arranged, and the ingress port information of this entry is PW2, not the inbound port AC5 of ARP request broadcasting packet, this moment, VPN3 adopted the MAC_A of the IP_A correspondence of record in the DHCP Snooping table, the ARP request broadcasting packet of response Client D, and no longer this ARP request broadcasting packet is transmitted to Tunnel2, thereby taking tunnel resource saved.
(4) address change:
As shown in Figure 5, change at host IP address, owing to obtain host IP address by the DHCP agreement in the network, therefore whole broadcast domain all can be received the Radio Broadcasting Agreements bag of DHCP during the IP address modification, thereby DHCP Snooping can upgrade respective record after listening to this broadcast packet in DHCP Snooping TBL, thereby guarantees that the information of record in the Snooping table and the actual address information of main frame realize in real time synchronously.
When the physics MAC Address of main frame changes (not proposed amendments physics MAC Address), MAC Address such as Client C has changed MAC_C1 into, when this moment, Client B need send packet to Client C, because among the ARP Snooping TBL of VPN1, it is corresponding with MAC_C to have recorded IP_C, so the purpose MAC that it uses MAC_C go to visit Client C obviously in this case visit fail, Client B can enter the retry transmission flow.This situation can last till the overtime inefficacy of arp entry of MAC_C always, this moment, Client B was because the arp entry inefficacy of the MAC_C of self, can send ARP broadcasting to VPN1, because the arp entry of this MAC_C among VPN2, VPN1, the VPN3 also lost efficacy, so should the broadcasting meeting flood at the whole network, after Client C replys this ARP request message, can in VPN1, VPN2, VPN3, regenerate the arp entry of MAC_C1.
Present embodiment is by using the record of ARP Snooping table and DHCP Snooping table, finished the rapid answer of ARP request broadcasting packet, thereby significantly reduced the propagation of ARP broadcasting packet in the tunnel, saved the network bandwidth effectively, improved utilization of network bandwidth.
As shown in Figure 6, present embodiment also provides a kind of device of inquiring about physical address, comprising: message is intercepted unit, address table maintenance unit and address lookup unit, wherein:
Message is intercepted the unit, is used for starting ARP Snooping and DHCP Snooping, intercepts ARP message and DHCP message respectively, obtains source IP address, source MAC and the ingress port information of message from the message that listens to;
The address table maintenance unit, the ARP Snooping table and the DHCP Snooping that are used for setting up show, and message is intercepted source IP address, source MAC and the ingress port information that the unit obtains, and correspondingly are saved in ARP Snooping table or the DHCP Snooping table;
The address lookup unit, be used for intercepting ARP message that the unit listens to when being ARP request broadcasting packet at message, the purpose IP address of inquiry ARP request broadcasting packet from ARP Snooping table and/or DHCP Snooping table, when inquiring purpose IP address, the MAC Address of purpose IP address correspondence is returned to the transmit leg of ARP request broadcasting packet.
Said apparatus also comprises packet sending unit, and packet sending unit is used for when query unit does not inquire purpose IP address, sends ARP request broadcasting packet to all of the port;
Message is intercepted the unit, also is used for obtaining MAC Address and the ingress port information of purpose IP address correspondence when receiving the arp response broadcasting packet of ARP request broadcasting packet correspondence;
The address table maintenance unit, the MAC Address and the ingress port information that also are used for message is intercepted the purpose IP address correspondence that the unit obtains are saved in ARP Snooping table.
The address lookup unit, also be used for when inquiring purpose IP address, whether the ingress port information of judging purpose IP address correspondence is identical with the ingress port information of ARP request broadcasting packet, if inequality, then the MAC Address with purpose IP address correspondence returns to the transmit leg that ARP asks broadcasting packet.
The address table maintenance unit also is used for intercepting the unit when receiving the dhcp broadcast protocol massages of change IP address at message, upgrades corresponding IP address in DHCP Snooping table; And, when message is intercepted the ARP data message of the change MAC Address that the unit receives client broadcasting, in ARP Snooping table, upgrade corresponding MAC Address, perhaps, when the overtime inefficacy of the MAC Address of client, the notice packet sending unit sends ARP request broadcasting packet to all of the port, and intercepts after the unit receives the arp response broadcasting packet that client sends at message, upgrades corresponding MAC Address.
The address table maintenance unit, also be used for when the ARP message that listens to is ARP request broadcasting packet, whether the purpose IP address of judging ARP request broadcasting packet is the PE its own IP address, if not, then from ARP Snooping table and/or DHCP Snooping table, inquire about the purpose IP address that ARP asks broadcasting packet.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of inquiring about physical address is characterized in that, comprising:
Provider edge equipment (PE) enabling address analysis protocol is intercepted (ARP Snooping) and DynamicHost and agreement is set is intercepted (DHCP Snooping), intercept ARP message and DHCP message respectively, from the message that listens to, obtain source IP address, medium access control (MAC) address, source and the ingress port information of message, and correspondingly be saved in the ARP Snooping table or DHCP Snooping table of foundation;
When described PE is ARP request broadcasting packet at the ARP message that listens to, the purpose IP address of the described ARP request of inquiry broadcasting packet from described ARP Snooping table and/or DHCP Snooping table, when inquiring described purpose IP address, the MAC Address of described purpose IP address correspondence is returned to the transmit leg of described ARP request broadcasting packet.
2. the method for claim 1 is characterized in that, also comprises:
Described PE is not when inquiring described purpose IP address, send described ARP request broadcasting packet to all of the port, and when receiving the arp response broadcasting packet of described ARP request broadcasting packet correspondence, obtain MAC Address and the ingress port information of described purpose IP address correspondence, and be saved in the described ARP Snooping table.
3. the method for claim 1 is characterized in that, also comprises:
Described PE is when inquiring described purpose IP address, whether the ingress port information of also judging described purpose IP address correspondence is identical with the ingress port information of described ARP request broadcasting packet, if inequality, then the MAC Address with described purpose IP address correspondence returns to the transmit leg that described ARP asks broadcasting packet.
4. the method for claim 1 is characterized in that, also comprises:
Described PE upgrades corresponding IP address in described DHCP Snooping table when receiving the dhcp broadcast protocol massages of change IP address; And,
When the ARP data message of the change MAC Address that receives client (Client) broadcasting, in described ARP Snooping table, upgrade corresponding MAC Address, perhaps, when the overtime inefficacy of the MAC Address of client, send ARP request broadcasting packet to all of the port, and behind the arp response broadcasting packet that receives described client transmission, upgrade corresponding MAC Address.
5. the method for claim 1 is characterized in that, also comprises:
When described PE is ARP request broadcasting packet at the ARP message that listens to, whether the purpose IP address of also judging described ARP request broadcasting packet is this PE its own IP address, if not, then from described ARP Snooping table and/or DHCP Snooping table, inquire about the purpose IP address that described ARP asks broadcasting packet.
6. a device of inquiring about physical address is characterized in that, comprising: message is intercepted unit, address table maintenance unit and address lookup unit, wherein:
Described message is intercepted the unit, being used for the enabling address analysis protocol intercepts (ARP Snooping) and DynamicHost and agreement is set intercepts (DHCP Snooping), intercept ARP message and DHCP message respectively, from the message that listens to, obtain source IP address, medium access control (MAC) address, source and the ingress port information of message;
Described address table maintenance unit, the ARP Snooping table and the DHCP Snooping that are used for setting up show, described message is intercepted source IP address, source MAC and the ingress port information that the unit obtains, correspondingly be saved in ARP Snooping table or the DHCP Snooping table;
Described address lookup unit, be used for intercepting ARP message that the unit listens to when being ARP request broadcasting packet at described message, the purpose IP address of the described ARP request of inquiry broadcasting packet from described ARP Snooping table and/or DHCP Snooping table, when inquiring described purpose IP address, the MAC Address of described purpose IP address correspondence is returned to the transmit leg of described ARP request broadcasting packet.
7. device as claimed in claim 6 is characterized in that, also comprises packet sending unit, wherein:
Described packet sending unit is used for when described query unit does not inquire described purpose IP address, sends described ARP request broadcasting packet to all of the port;
Described message is intercepted the unit, also is used for obtaining MAC Address and the ingress port information of described purpose IP address correspondence when receiving the arp response broadcasting packet of described ARP request broadcasting packet correspondence;
Described address table maintenance unit, the MAC Address and the ingress port information that also are used for message is intercepted the described purpose IP address correspondence that the unit obtains are saved in described ARP Snooping table.
8. device as claimed in claim 6 is characterized in that:
Described address lookup unit, also be used for when inquiring described purpose IP address, whether the ingress port information of judging described purpose IP address correspondence is identical with the ingress port information of described ARP request broadcasting packet, if inequality, then the MAC Address with described purpose IP address correspondence returns to the transmit leg that described ARP asks broadcasting packet.
9. device as claimed in claim 6 is characterized in that:
Described address table maintenance unit also is used for intercepting the unit when receiving the dhcp broadcast protocol massages of change IP address at described message, upgrades corresponding IP address in described DHCP Snooping table; And, when described message is intercepted the ARP data message of the change MAC Address that the unit receives client (Client) broadcasting, in described ARP Snooping table, upgrade corresponding MAC Address, perhaps, when the overtime inefficacy of the MAC Address of client, the notice packet sending unit sends ARP request broadcasting packet to all of the port, and intercepts after the unit receives the arp response broadcasting packet that described client sends at described message, upgrades corresponding MAC Address.
10. device as claimed in claim 6 is characterized in that:
Described address table maintenance unit, also be used for when the ARP message that listens to is ARP request broadcasting packet, whether the purpose IP address of judging described ARP request broadcasting packet is the PE its own IP address, if not, then from described ARP Snooping table and/or DHCP Snooping table, inquire about the purpose IP address that described ARP asks broadcasting packet.
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| CN112383646A (en) * | 2020-11-13 | 2021-02-19 | 新华三大数据技术有限公司 | Security entry configuration method and device, SDN controller and medium |
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