CN100359875C - Method for realizing backup and load shared equally based on proxy of address resolution protocol - Google Patents
Method for realizing backup and load shared equally based on proxy of address resolution protocol Download PDFInfo
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- CN100359875C CN100359875C CNB2004100548597A CN200410054859A CN100359875C CN 100359875 C CN100359875 C CN 100359875C CN B2004100548597 A CNB2004100548597 A CN B2004100548597A CN 200410054859 A CN200410054859 A CN 200410054859A CN 100359875 C CN100359875 C CN 100359875C
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Abstract
The present invention relates to an ARP Proxy technology, particularly to a method for realizing an equal share of backups and loads on a proxy of an address resolution protocol. When a VRRP and an ARP Proxy are simultaneously applied to routers, a system resource can be fully utilized, and the reliability of message transmission can be ensured. The present invention responds to an ARP request in the way of different MAC addresses according to the forwarding capacity and the network bandwidth of each router in a VRRP backup group; an association judgement function of the ARP Proxy and the VRRP, a virtual MAC function and a function for judging an ARP response are added in the routers in order to cause the ARP Proxy and the VRRP to be organically combined.
Description
Technical field
The present invention relates to ARP Proxy technology, particularly use the technology of ARP Proxy and VRRP simultaneously.
Background technology
In the Ethernet (Ethernet) of extensive use now, a main frame will carry out direct communication with another main frame, the second layer physical address that must know destination host is media interviews control (MediumAccess Control, be called for short " MAC ") address, for example, in local area network (LAN) (Local Area Network is called for short " LAN "), network is with the form transmission data of frame, and each frame the inside of transmitting in network all comprises the MAC Address of destination host.Main frame is before transmit frame, need be internetworking agreement (Internet Protocol with the layer 3 address of destination host, abbreviation " IP ") address transition is the MAC Address of destination host, this conversion is finished by address resolution protocol (Address Resolution Protocol is called for short " ARP ").The basic function of ARP agreement is exactly by target ip address, and the query aim MAC Address is to guarantee carrying out smoothly of communication.Wherein, IP address and MAC Address are stored in the arp cache table of main frame one to one, and when needs upgraded the arp cache table, main frame can send the ARP request, and this ARP request can be propagated in net with the form of broadcasting packet.After having obtained arp response, main frame can deposit ARP information in the arp cache table.The arp cache table has adopted aging mechanism, if certain delegation in the table does not use in a period of time, will be deleted, and can significantly reduce the length of arp cache table like this, accelerate inquiry velocity.
In the common ARP agreement, every main frame only can be answered relevant IP address lookup itself, because the ARP request is a broadcasting packet, and in order to prevent broadcast storm, the Control Network flow, ARP proxy (Proxy) technology is arisen at the historic moment.ARP Proxy not only can answer relevant IP address lookup own, and answers the inquiry to other host IP address.
The system of the application of ARP Proxy forms as shown in Figure 1.Among Fig. 1, main frame (HOST) A belongs to different physical networks respectively with host B, and the IP address belongs to the different sub-network of same IP network (172.16.0.0), does not dispose mask and gateway.The following describes ARP Proxy work principle.
At first, when host A (IP address: 172.16.2.2; MAC Address: 2222.2222.2222) need be to host B (IP address: 172.16.4.4; MAC Address: when 4444.4444.4444) sending data, if there is not the ARP information of host B on the host A, then host A is sent out the ARP request to host B; Then, the interface that links to each other with the host A network has enabled the router-A of ARP Proxy function and has received the ARP request, if there is the normal route of host B in router-A, then replace host B to respond the real MAC address (3333.3333.3333) of the interface of router-A; Subsequently, host A has all been issued router-A to the IP message (IP address, order ground is 172.16.4.4) that host B sends, by router-A the IP message is done normal IP routing forwarding, the IP message that mails to host B finally arrives host B by internet (Internet).Those of ordinary skill in the art be appreciated that when processing and the above-mentioned processing procedure of host B ARP Proxy when host A sends data similar.
Need to prove, in the relevant treatment of ARP Proxy, all ARP handle and carry out at router gateway (ARP subnet gateways), the main frame in the network that networks needn't do any change, carrying out work according to standard A RP agreement fully, is a standard I P network.
ARP Proxy also can carry out under the environment of a plurality of LAN, as shown in Figure 2.
Under the environment of a plurality of LAN shown in Figure 2, move in the system of ARP Proxy, external network links to each other with Ethernet switch, Ethernet switch is continuous with different hubs (HUB) by different ports, the PC that the quantity of compiling each HUB does not wait (Personal Computer is called for short " PC ").Mechanism 1 and mechanism 2 exist together a VLAN (Virtual Local Area Network, be called for short " VLAN ") and same IP subnet link to each other with external network by same Ethernet switch.For the consideration of secure context, any PC in the mechanism 1 can not with any PC double layer intercommunication in the mechanism 2, but require three layers can intercommunication.The problem of two layers of isolation adopts two layers of interior isolation features of the same VLAN between ethernet switch port to solve; Three layer intercommunications adopt ARP Proxy to solve.
General user's main frame is by the visit of a switch realization to external network, as shown in Figure 3.All hosts all is provided with a default route, is 10.100.10.1 as the default route next hop address among Fig. 3, the message that main frame mails to external network will mail to three-tier switch by default route, thereby has realized communicating by letter of main frame and external network.When switch broke down, all were that the main frame of next jumping of default route will break and the communicating by letter of external network with this switch in this network segment.
Along with networks development, the user is more and more higher to the demand of network reliability.As everyone knows, dynamic routing protocol such as routing information protocol (Routing Information Protocol, abbreviation " RIP "), OSPF (Open Shortest Path First, be called for short " OSPF ") can do the redundancy backup of a plurality of network paths, after a predominating path disconnected, the user can use other backup path visit external network.But, be out of the question for dynamic routing protocol of main frame operation of most terminal uses, this is subjected to the restriction of administration overhead, processing expenditure, network security and agreement realization or the like.Virtual Router Redundacy Protocol (Virtual Router Redundancy Protocol is called for short " VRRP ") is exactly to propose for addressing the above problem, and it is the design of local area network with multicast or broadcast-capable.VRRP comprises that with the set of router of local area network (LAN) a master control (Master) router is active router and several backups (Backup) router, is organized into a virtual router, and this group router is called as a backup group.Wherein, virtual router externally shows as a router logic with unique fixed ip address and MAC Address.In VRRP, use a virtual MAC address and a virtual IP address as gateway.
The system of the application of VRRP forms as shown in Figure 4.In Fig. 4, virtual router has the IP address 10.100.10.1 of oneself, and wherein, this IP address is commonly called the virtual ip address of backup group, can be identical with the interface IP address of certain switch in the backup group.Router in the backup group also has the IP address of oneself, and for example the IP address of master control router is 10.100.10.2 among Fig. 4, and the IP address of backup router is 10.100.10.3.But the main frame in local area network (LAN) is only known the IP address 10.100.10.1 of this virtual router, and does not know the IP address 10.100.10.2 of concrete master control router and the IP address 10.100.10.3 of backup router.Next jumping of default route of main frame oneself in the local area network (LAN) is set to the IP address 10.100.10.1 of this virtual router.So the main frame in the network just communicates by this virtual router and other network.When the master control router cisco unity malfunction in the backup group, other backup router in the backup group several seconds the time delay the master control router that will take over cisco unity malfunction and become new master control router, the main frame of continuation in network provides route service, thereby the main frame in the realization network communicates with external network incessantly, because this switching need not change IP address and MAC Address, so be transparent to the terminal user system.
In existing network application,, generally all can in network, use the VRRP agreement to carry out redundancy backup for the reliability of network; In order to realize two layers of isolation between the user, generally all can use between VLAN and to isolate and the VLAN inner port is isolated this two kinds of technology, in the time of two layers of isolation of use, just need in VLAN, move ARP Proxy.When isolating under the situation about using simultaneously at VRRP and VLAN inner port, the situation that VRRP and ARP Proxy work simultaneously will appear in the network.
In the existing technical scheme, the schematic diagram that the system that VRRP and ARP Proxy work simultaneously forms as shown in Figure 5.
As shown in Figure 5, the real IP address of router R-A is IP A, and real MAC address is MACA; The real IP address of router R-B is IP B, and real MAC address is MAC B; The IP address of host PC-C is IP C, and MAC Address is MAC C; The IP address of host PC-D is IP D, and MAC Address is MAC D.
Wherein, router R-A, router R-B start ARP Proxy and VRRP simultaneously.In VRRP, router R-A is the master control router, and router R-B is a backup router, and they form the backup group of VRRP jointly, constitute a virtual router, use a virtual MAC address MACE and virtual IP address ip E gateway as host PC-C, host PC-D.Need to prove, started the VLAN inner port on the Ethernet switch and isolated, Ethernet switch 3 two layers of isolation of 4 ports.
In actual applications, there is following problem in such scheme: at first, the system resource of existing technical scheme is not fully utilized, and the transfer capability and the network bandwidth of backup router have been wasted.
Secondly, the existing technical scheme of using ARP Proxy and VRRP simultaneously may cause message to be lost for a long time.
Cause the main cause of this situation to be, at first, because in the backup group of existing VRRP technology, no matter how many routers are arranged, but synchronization can only have a master control router to be responsible for E-Packeting, backup router does not E-Packet, and causes the transfer capability of backup router and the network bandwidth to utilize, and therefore causes the transfer capability of backup router and the network bandwidth to be wasted.
Secondly, owing to started ARP Proxy and VRRP simultaneously, and ARP Proxy and the separate running of VRRP, can produce mutually between them and disturb, cause the message under the multiple abnormal conditions to lose for a long time, these situations comprise following several:
Situation 1. has been owing to started ARP Proxy and VRRP simultaneously, and the backup router among the VRRP also can be made answer to the ARP request of the virtual ip address of looking for virtual router of main frame, answer be the real MAC address of backup router.In this case, the virtual ip address of virtual router is with regard to the real MAC address of corresponding backup router in the arp cache table in the main frame, and backup router will be received the message of main frame, and the master control router can not receive message on the contrary.If crashing appears in backup router, main frame can be lost to the message that backup router sends, and is aging up to the arp cache table of main frame, sends out again till the ARP request.
Situation 2. is owing to start the isolation of VLAN inner port on Ethernet switch, if source host C searches destination host D, when the master control router was working properly, the ARP request will obtain the arp reply of a destination host IP address corresponding master control router real MAC address.In this case, if the master control router crashes, remain destination host IP address corresponding master control router real MAC address in the ARP buffer table of source host, source host sends to the message of destination host owing to can not get transmitting and will all lose like this, arp cache table up to source host is aging, sends out again till the ARP request.
Situation 3. when a router in the backup group (supposing that this router is a router-A) when destination host sends the ARP request, because the ARP request is a broadcasting packet, therefore the router that started ARP Proxy of other in the backup group also can be made response to the ARP request, so just may cause occurring in the arp cache table of router-A the situation of the MAC Address of other router (supposing that this router is router B) in the destination host IP correspondence backup group.In this case, if router B crashes, then the router-A message that sends to destination host will all be lost, and is aging up to the arp cache table of source host, sends out again till the ARP request.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that realizes that on address analysis protocol proxy load is shared equally, make that system resource is fully utilized when using VRRP and ARP Proxy simultaneously on the router, the reliability of message transmissions is ensured.
For achieving the above object, the invention provides a kind of method that load is shared equally that on address analysis protocol proxy, realizes, comprise following steps:
A sets the address analysis protocol proxy group, and consults to generate a main address analysis protocol proxy, some sub-address analysis protocols agency and some backup address analysis protocols agency by the described address analysis protocol proxy in the described address analysis protocol proxy group;
The described main address analysis protocol proxy of B is a described main address analysis protocol proxy and a unique separately virtual media access control address of described sub-address analysis protocol agent allocation;
The described main address analysis protocol proxy of C is organized interior virtual media access control address according to described main address analysis protocol proxy and described sub-address analysis protocol agency's transfer capability to the different described location analysis protocol agency of arp request response who receives;
Described main address analysis protocol proxy of D and described sub-address analysis protocol agency are mail to the message of the virtual media access control address of self;
E repeats described steps A-D when described main address analysis protocol proxy crashes or have new address analysis protocol proxy to add described address analysis protocol proxy group.
Wherein, among the described step D, other agent equipment can't duration of work in described address analysis protocol proxy group, and described main address analysis protocol proxy or described sub-address analysis protocol agency are mail to the message of all virtual media access control address of described address analysis protocol proxy group.
Among the described step D, described main address analysis protocol proxy and described sub-address analysis protocol agency are mail to the message of all virtual media access control address of described address analysis protocol proxy group.
Described address analysis protocol proxy preestablishes priority, consults to generate described main address analysis protocol proxy, described sub-address analysis protocol agency and described backup address analysis protocol agency according to the priority of described address analysis protocol proxy in the described steps A.
The content that disposes on the interface of described address analysis protocol proxy comprises: the sign of described address analysis protocol proxy group, the priority of described address analysis protocol proxy and transfer capability, the described virtual media access control address of described address analysis protocol proxy group.
The present invention also provides a kind of method that realizes backup on address analysis protocol proxy, as also moving Virtual Router Redundacy Protocol on the router of described address analysis protocol proxy, when if described router is in the Virtual Router Redundacy Protocol major state, then described address analysis protocol proxy work, otherwise described address analysis protocol proxy is not worked.
The present invention also provides a kind of method that realizes backup on address analysis protocol proxy, as also moving Virtual Router Redundacy Protocol on the router of described address analysis protocol proxy, a plurality of described address analysis protocol proxies are set identical virtual media access control address, and described address analysis protocol proxy mails to the message of own virtual media access control address.
Wherein, the virtual media access control address of described virtual media access control address and Virtual Router Redundacy Protocol is identical.
The present invention also provides a kind of method that realizes backup on address analysis protocol proxy, as also moving Virtual Router Redundacy Protocol on the router of described address analysis protocol proxy, described address analysis protocol proxy judges that the address resolution protocol response of receiving is whether identical with other analysis protocol agency's true media access control address in the Virtual Router Redundacy Protocol backup group, if then abandon described address resolution protocol response.
By finding that relatively technical scheme difference with the prior art of the present invention is that technical scheme of the present invention is according to the transfer capability and the network bandwidth of each router in the VRRP backup group, with different MAC Address response ARP requests; And the present invention program increases the function of related arbitration functions, virtual MAC function and the judgement arp response of ARP Proxy and VRRP in router, and ARPProxy and VRRP are organically combined.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly at first, because technical scheme of the present invention can be according to the transfer capability and the network bandwidth of each router in the VRRP backup group, with different MAC Address response ARP requests, therefore the main frame in the network can mail to message a plurality of different MAC Address and transmits, thereby can realize in the VRRP backup group that load shares equally, avoided the waste of backup router transfer capability and bandwidth in the prior art, make full use of the transfer capability of the network equipment and resource, when reducing network cost, promoted the performance of network greatly; Secondly, because the present invention program increases the function of related arbitration functions, virtual MAC function and the judgement arp response of ARP Proxy and VRRP in router, thereby ARP Proxy and VRRP are combined, interfering with each other when having avoided ARP Proxy and VRRP to work simultaneously, guaranteed that message can obtain correct forwarding in the VRRP backup group of having used ARP Proxy, avoid to cause in the prior art generation of three kinds of situations that message loses for a long time, improved the reliability that message is transmitted in the network greatly.
Description of drawings
Fig. 1 is that the system of the application of ARP Proxy forms schematic diagram;
Fig. 2 is system's composition schematic diagram that the environment of a plurality of LAN moves ARP Proxy down;
Fig. 3 passes through the system composition schematic diagram of a switch realization to the visit of external network for main frame;
Fig. 4 is that the system of the application of VRRP forms schematic diagram;
Fig. 5 forms schematic diagram for the system that VRRP in the prior art and ARP Proxy work simultaneously;
Fig. 6 is the flow chart of realizing the method that load is shared equally on ARP Proxy according to a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Basic principle of the present invention once at first is described.
The problem that is wasted for the transfer capability that solves backup router in the prior art and the network bandwidth, the present invention program increases some functions of router, make the router in the backup group of VRRP can be according to its transfer capability and network bandwidth response ARP request, can transmit according to its transfer capability and the network bandwidth, thereby can make full use of equipment and bandwidth in the network, the realization load is shared equally on ARP Proxy.
In order to solve the problem that the message that may occur in the prior art is lost for a long time, the present invention program increases the function of related arbitration functions, virtual MAC function and the judgement arp response of ARP Proxy and VRRP in router, avoid the mutual interference mutually of ARP Proxy and VRRP, ARP Proxy and VRRP are organically combined, on ARP Proxy, realize backup, avoid message to lose for a long time.
Below in conjunction with specific embodiments of the invention the present invention program is described.
As shown in Figure 6, the method that load is shared equally that realizes on ARP Proxy according to a preferred embodiment of the present invention comprises following steps.
At first enter step 110, set ARP Proxy group.Wherein, an ARP Proxy group can comprise the router of a plurality of operation ARP Proxy, and these routers all belong to a VRRP backup group.
Then enter step 120, router consults to elect main Proxy, secondary Proxy and standby Proxy by communicating with one another in the group.In a preferred embodiment of the present invention, many routers in the group can be provided with the priority of oneself, in this step, just elect major and minor and standby Proxy according to the priority of router.Wherein, carry out mutual communication by the special protocol message between the router in the group.Need to prove that main Proxy has only one, secondary Proxy and standby Proxy can have a plurality of.
Then enter step 130, main Proxy is that main Proxy and each secondary Proxy distribute a unique virtual mac address.In a preferred embodiment of the present invention, the interior assignable virtual mac address of group has a plurality of, can be disposed by administrative staff.
Then enter step 140, the ARP request of main Proxy response main frame, according to the transfer capability of major and minor Proxy respond different agencies organize in virtual mac address give main frame.Wherein, the transfer capability of Proxy can be set by administrative staff, and main Proxy is in response ARP when request, still has the virtual mac address of Proxy more than needed to give main frame according to the transfer capability response transfer capability of major and minor Proxy.Those of ordinary skill in the art are appreciated that main frame will mail to message a plurality of virtual mac address by responding different virtual mac address, with regard to having realized the load of router in organizing are shared equally like this.
Then enter step 150, main Proxy, secondary Proxy send to the message of own virtual mac address.Wherein, message forwarding and prior art are identical, all are to carry out at three layers, do not describe in detail at this.
Then enter step 160, judge whether main Proxy deadlock or have new router to add,, otherwise finish if then enter step 120.Wherein, this step is in order to guarantee that the highest router of in-group priority is all the time as router in the main Proxy management group.
So far, finish all flow processs that the realization load is shared equally on ARP Proxy.
Need to prove, for fear of losing of particular importance message, in a preferred embodiment of the present invention, main Proxy, secondary Proxy are under special circumstances, for example many routers break down in group, during only remaining agent equipment, this equipment will be in a period of time (such as 20 minutes, be the MAC address aging time of host PC), the message of all virtual MAC in the forwarding group.During this period of time (host PC is acquired new MAC Address again), this agency just only issues the message of own MAC.And for example, crash at master agent, secondary agency also formally is not upgraded under the situation of master agent, and secondary agency transmits all virtual MAC messages.
According to a preferred embodiment of the present invention realize that on ARP Proxy load is shared equally the time can be according to carrying out equipment disposition to order:
Interface?vlan?100
Ip?address?10.1.1.2?255.255.255.0
APRG?gid?10?priority?100?ablity?10
APRG?vmac?0100-0011-1101?0100-0011-1102
Above-mentioned configuration order is represented, configuration ARP Proxy group 10 on three layer interfaces of VLAN100, and priority is 100, and transfer capability is 10, and virtual mac address has two: 0100-0011-1102 and 0100-0011-1102.
The method that realizes backup on ARP Proxy according to a preferred embodiment of the present invention comprises following steps.
At first, the router that moves ARP Proxy and VRRP simultaneously carries out the related judgement of ARP Proxy and VRRP, and when VRRP was in the Master state, ARP Proxy also was in enabled state; When VRRP was in Backup, ARP Proxy was in off position.Those of ordinary skill in the art are appreciated that so just can avoid the problem that message is lost for a long time in the situation 1 mentioned above, when using ARP Proxy, has realized the redundant route backup of VRRP.
Secondly, a plurality of ARP Proxy are set identical virtual mac address, ARP Proxy transmits the message that mails to own virtual mac address.Need to prove that this need increase the virtual mac address function on ARP Proxy, virtual mac address can be identical with the virtual mac address of VRRP, also can be different.Those of ordinary skill in the art are appreciated that a plurality of ARP Proxy use same virtual mac address, just can avoid the problem that message is lost for a long time in the situation 2 mentioned above, when using ARP Proxy, have realized the redundant route backup of VRRP.
The 3rd, ARP Proxy judges the arp response that obtains, if identical with the MAC Address of other ARP Proxy in the VRRP backup group then abandon.Those of ordinary skill in the art are appreciated that by increasing the judgement of this step, just can avoid the problem that message is lost for a long time in the situation 3 mentioned above, when using ARP Proxy, have realized the redundant route backup of VRRP.
By implementing above-mentioned steps, just on ARP Proxy, realized backup, avoided causing the appearance of three kinds of situations of losing for a long time of message.
Wherein, according to a preferred embodiment of the present invention on ARP Proxy, realize backup the time can be according to carrying out equipment disposition to order:
Interface?vlan?100
Ip?address?10.1.1.2?255.255.255.0
Vrrp?vrid?10?virtual-ip?10.1.1.1
Arp?proxy?enable
Arp?proxy?track?vrrp?vrid?10
Above-mentioned configuration order is represented, the group 10 of configuration VRRP on three layer interfaces of VLAN10, and empty IP is 10.1.1.1, starts the function of ARP Proxy, allows the related VRRP of ARP Proxy organize 10 state simultaneously.If router is in the state of the Master of VRRP group 10, ARP Proxy uses the virtual mac address of the virtual MAC address of VRRP as ARP Proxy simultaneously with regard to startup work; Otherwise ARP Proxy just quits work.
Those of ordinary skill in the art are appreciated that above-mentioned all methods, can realize by add corresponding program according to the requirement described in the literary composition in router easily.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (4)
1. on address analysis protocol proxy, realize the method that load is shared equally for one kind, it is characterized in that, comprise following steps:
A sets the address analysis protocol proxy group, and consults to generate a main address analysis protocol proxy, some sub-address analysis protocols agency and some backup address analysis protocols agency by the described address analysis protocol proxy in the described address analysis protocol proxy group;
The described main address analysis protocol proxy of B is described main address analysis protocol proxy and the unique separately virtual media access control address of described sub-address analysis protocol agent allocation;
The described main address analysis protocol proxy of C is according to described main address analysis protocol proxy and described sub-address analysis protocol agency's transfer capability, to the virtual media access control address in the different described address analysis protocol proxy group of the arp request response of receiving;
Described main address analysis protocol proxy of D and described sub-address analysis protocol agency are mail to the message of the virtual media access control address of self;
E repeats described steps A-D when described main address analysis protocol proxy crashes or have new address analysis protocol proxy to add described address analysis protocol proxy group.
2. the method that the realization load is shared equally on address analysis protocol proxy according to claim 1, it is characterized in that, among the described step D, other agent equipment can't duration of work in described address analysis protocol proxy group, and described main address analysis protocol proxy or described sub-address analysis protocol agency are mail to the message of all virtual media access control address of described address analysis protocol proxy group.
3. the method that the realization load is shared equally on address analysis protocol proxy according to claim 1, it is characterized in that, described address analysis protocol proxy preestablishes priority, consults to generate described main address analysis protocol proxy, described sub-address analysis protocol agency and described backup address analysis protocol agency according to the priority of described address analysis protocol proxy in the described steps A.
4. the method that the realization load is shared equally on address analysis protocol proxy according to claim 1, it is characterized in that, the content that disposes on the interface of described address analysis protocol proxy comprises: the sign of described address analysis protocol proxy group, the priority of described address analysis protocol proxy and transfer capability, the described virtual media access control address of described address analysis protocol proxy group.
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| EP1011231A2 (en) * | 1998-12-15 | 2000-06-21 | Nortel Networks Corporation | Method and apparatus providing for router redundancy of non internet protocols using the virtual router redundancy protocol |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101729425B (en) * | 2009-12-22 | 2012-07-11 | 杭州华三通信技术有限公司 | Method and equipment for flow sending in VRRP networking |
| CN102238092A (en) * | 2011-08-02 | 2011-11-09 | 杭州华三通信技术有限公司 | Method for performing load sharing on encoder and encoder |
| CN102238092B (en) * | 2011-08-02 | 2013-09-18 | 浙江宇视科技有限公司 | Method for performing load sharing on encoder and encoder |
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| Publication number | Publication date |
|---|---|
| CN1728661A (en) | 2006-02-01 |
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