CN100440848C - Data package transmitting method and network exchanger adopting said method - Google Patents
Data package transmitting method and network exchanger adopting said method Download PDFInfo
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- CN100440848C CN100440848C CNB021067058A CN02106705A CN100440848C CN 100440848 C CN100440848 C CN 100440848C CN B021067058 A CNB021067058 A CN B021067058A CN 02106705 A CN02106705 A CN 02106705A CN 100440848 C CN100440848 C CN 100440848C
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Abstract
The present invention relates to a data packet transmitting method and a network exchanger adopting the method. The network exchanger comprises a plurality of connecting ports, a label exchange rule list, a multicast cross-reference list, a cross-reference list of a virtual local area network and a label setting device. The method comprises the following steps: a data packet is received; according to the multicast information, the label exchange rule list and the cross-reference list of a virtual local area network of the data packet, a multicast port mask, a label exchange rule and a label additional rule correspond; the data packet is transmitted according to the connecting port corresponding to the multicast port mask, and a relevant virtual local area network label is seletively added to the data packet according to the label additional rule and the label exchange rule.
Description
Technical field
The present invention relates to the network switch of a kind of data package transmitting method and adopting said method, particularly support the data package transmitting method of ip multicast and VLAN and the network switch of adopting said method simultaneously.
Background technology
Multicast (multicasting) technology is at specific customer group, transmit the method for the full blast of data such as multimedia video file on world-wide web or Intranet, common application examples has the network teleconference, network radio station or even Network TV Station or the like.Because the data volume of multimedia video file is considerably big usually; therefore when in network, carrying out audio-visual broadcasting behavior; as easy as rolling off a logly occupy the bandwidth of whole network and make its paralysis, so this class behavior can be carried out in ip multicast (IP multicasting) mode usually.IGMP (Internet Group ManagementProtocol is called for short IGMP) described in request comment file 1112 (Request for Comment 1112, be called for short RFC1112) number, roughly standard the primitive rule of multicast.And general switching hub (Switching Hub) also can't be told ip multicast, and the switching hub that only has the IGMP function just can directly transmit IP Multicast to the port of needs, and other port still can normally use the bandwidth of network.
Fig. 1 one can support the VoD network structural representation of IGMP multicast function, wherein be connected with on-the-spot broadcasting content provider 101 or ordering server 102 (Video On DemandServer, be called for short VOD Server) etc. the P (backbonerouter) 10 of work station (workstation), can utilize the multicasting technology of IGMP that the data commentaries on classics is reached the particular group of living scattered in various places, must have the function of supporting IGMP but prerequisite is these switching hubs.For instance, be connected in the client 111 and client 112 of first switching hub 11, a client 133 that is connected in a client 121 of second switching hub 12 and is connected in the 3rd switching hub 13 is to add simultaneously in the customer group of ordering server 102, the multicast group identification code (multicast group ID) of supposing this customer group again is 224.1.1.5, so when having first switching hub 11 of supporting IGMP, when second switching hub 12 and the 3rd switching hub 13 receive the package that is transmitted in the external world, to carry out a what is called and " spy upon " (snooping) action, its target ip address (Destination IP address) with receiving package with in be built in each switching hub inside an ip multicast table (IP multicast table) compare, and then correspondence goes out a port mask (port mask), the foundation that transmits as follow-up data.For instance, when first switching hub 11 with 8 ports is received package from ordering server 102, just table look-up according to its target ip address (224.1.1.5), and data point out only to have client 111 and client 112 to belong to the customer group of ordering server 102 in the table, so the port mask bit data that correspondence goes out is 11000000, and then make only can send to client 111 and client 112 and receive, and then realize the action of multicast (multicasting) by first port and second port from the package of ordering server 102.
And VLAN (Virtual LAN, be called for short VLAN) then be another network technology that develops for the problem of internet security, it mainly is that some client set is constituted an independently broadcast domain (broadcast domain), all members that make broadcasting that any work station among the VLAN sends or multicast information package only can be broadcast to this VLAN can not give other VLAN.By webmastering software, can be divided into different in logic local area network (LAN)s with on entity, being the client of same local area network (LAN), or allow the client that is dispersed in a plurality of local area network (LAN)s on the entity, connect to single local area network (LAN) in the mode of logic.The benefit of VLAN is to allow the user under the structure of same Ethernet still can possess privacy and internet security each other, and for company that is dispersed in zones of different or resident family, also can utilize VLAN to set identical local area network (LAN) for.Because VLAN is virtual, therefore quite has elasticity.
And VLAN division methods commonly used mainly can be divided into based on connectivity port (port-based) and based on the division methods of medium access control address (MAC-based).Is to utilize the stored VLAN identification code in the switching hub (VLAN ID is called for short VID) and the VLAN table of comparisons (VLAN table) of medium access control address (MAC address) to decide the flow direction of packet and wherein utilize the medium access control address for the division methods on basis.Fig. 2 is a partly form schematic diagram of a packet with VLAN label, wherein at source medium access control address (Source MACaddress, and be provided with 12 VLAN identification code VID in the VLAN label SMAC) and be provided with the VLAN label that length is 4 bytes (VLAN tag) between ethernet type (Ethernet type).
Function for the energy supported vlans, the network interface card of many new listing has had the function (hereinafter to be referred as the VLAN network interface card) of identification VLAN label, and this VLAN network interface card can't receive the packet with VLAN label, therefore in the VoD network structure of as shown in fig. 1 supported IGMP multicast function, when if some client is to use the VLAN network interface card and adheres to different VLAN separately, to cause the packet that is sent with multicast by the switching hub of supporting IGMP to be abandoned, thereby can't finish the transmission of data by the VLAN network interface card.And how to improve the shortcoming of above-mentioned existing means, be development main purpose of the present invention.
Summary of the invention
Technical problem to be solved by this invention provides a kind ofly can support data package transmitting method that ip multicast and vlan data bag transmit and a kind of network switch of this method of application simultaneously.
For achieving the above object, a kind of data package transmitting method provided by the invention is applied to a network switch, includes a plurality of connectivity ports, and a label is changed rule list, a multicast table of comparisons, the VLAN table of comparisons and a label setting device; Its method comprises the following step: this network switch receives a packet; This network switch is changed rule list and the VLAN table of comparisons according to the multicast information of this packet, label and correspondence goes out a multicast port mask, a label is changed a rule and a label ancillary rules; According to the vlan information of the packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules; And when a leap forbids that flag is set up, this network switch according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
According to above-mentioned conception, in the data package transmitting method of the present invention according to the multicast information of this packet and the corresponding method that goes out this multicast port mask can be: come a multicast table of comparisons that is arranged in this network switch is tabled look-up according to a destination address in this packet or an ip multicast address, and then correspondence goes out this multicast port mask.According to above-mentioned conception, this multicast table of comparisons can be an ip multicast table in the data package transmitting method of the present invention.According to above-mentioned conception, more can include a leap in the data package transmitting method of the present invention and forbid step, when forbidding that flag is set up, its leap when this network switch carries out the following step; According to the vlan information of the packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules; According to the multicast information of this packet and correspondence goes out this multicast port mask; And according to this multicast port mask and this virtual net port mask one of form the common factor port mask the corresponding connectivity port that goes out and this packet is sent, and corresponding VLAN label is attached on this packet according to this label ancillary rules.
According to above-mentioned conception, in the data package transmitting method of the present invention, according to the vlan information of this packet and the corresponding method that goes out this virtual net port mask can be: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this virtual net port mask.
According to above-mentioned conception, in the data package transmitting method of the present invention, according to the vlan information of this packet and the corresponding method that goes out this label ancillary rules can be: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this label ancillary rules.
The present invention's is a network switch on the other hand, and it has a plurality of connectivity ports receives with the biography of carrying out packet, and it comprises: a label is changed rule list, wherein stores a label and changes rule; The one VLAN table of comparisons is in order to according to the vlan information of this packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules; The one multicast table of comparisons, it is according to the multicast information of this packet and correspondence goes out a multicast port mask; And a label setting device, signal is connected to this VLAN table of comparisons and this multicast table of comparisons, and it is changed rule according to this label and optionally the corresponding VLAN label is attached on this packet with this label ancillary rules; And
Flag is forbidden in one leap;
Wherein when this leap forbids that flag is set up, this network switch according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
According to above-mentioned conception, can come this multicast table of comparisons is tabled look-up according to a destination address in this packet or an ip multicast address in the network switch of the present invention, and then correspondence goes out this multicast port mask.
According to above-mentioned conception, this multicast table of comparisons can be an ip multicast table in the network switch of the present invention.
According to above-mentioned conception, more can include a leap in the network switch of the present invention and forbid flag, and this VLAN table of comparisons is according to the vlan information of received packet and correspondence goes out a virtual net port mask and a label ancillary rules, and this label setting device is to forbid that according to this leap flag is set up, just according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and corresponding VLAN label is attached on this packet according to this label ancillary rules.
According to above-mentioned conception, can come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet in the network switch of the present invention, and then correspondence goes out this virtual net port mask.
According to above-mentioned conception, can come this VLAN table of comparisons is tabled look-up according to the VLAN identification code in this packet in the network switch of the present invention, and then correspondence goes out this label ancillary rules.
Of the present invention is a kind of data package transmitting method more on the one hand, is applied in one and has on the network switch of a plurality of connectivity ports, and it comprises the following step: this network switch receives a packet; This network switch is according to the multicast information of this packet and correspondence goes out a multicast port mask and a label is changed rule; And this network switch according to this multicast port mask the corresponding connectivity port that goes out and this packet is sent, and change rule and the value that will be attached to a VLAN label on this packet is set according to this label.
According to above-mentioned conception, more can comprise the following step in the data package transmitting method of the present invention: the value of this VLAN label of finishing according to setting and correspondence goes out a label ancillary rules; And according to this label ancillary rules determine whether will be attached to the VLAN label deletion of this packet.The step that goes out this label ancillary rules as for correspondence can be: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this label ancillary rules.
According to above-mentioned conception, in the data package transmitting method of the present invention according to the multicast information of this packet and the corresponding step that goes out this multicast port mask can be: come a multicast table of comparisons that is arranged in this network switch is tabled look-up according to the destination address in this packet, and then correspondence goes out this multicast port mask.
According to above-mentioned conception, this multicast table of comparisons can be an ip multicast table in the data package transmitting method of the present invention.
According to above-mentioned conception, more can include a leap in the data package transmitting method of the present invention and forbid step, when forbidding that flag is set up, its leap when this network switch carries out the following step; According to the vlan information of the packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules; According to the multicast information of this packet and correspondence goes out this multicast port mask; And according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
According to above-mentioned conception, in the data package transmitting method of the present invention according to the vlan information of this packet and the corresponding step that goes out this virtual net port mask can be: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to VLAN identification code one of in this packet, and then correspondence goes out this virtual net port mask.
According to above-mentioned conception, in the data package transmitting method of the present invention according to the vlan information of this packet and the corresponding step that goes out this label ancillary rules can be: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this label ancillary rules.
According to above-mentioned conception, destination address of the present invention can be a target MAC (Media Access Control) address (dmac address).
According to above-mentioned conception, destination address of the present invention can be a purpose IP address.
Description of drawings
Below, the present invention is carried out more deep explanation by the drawings and the specific embodiments:
Fig. 1 one can support the VoD network structural representation of IGMP multicast function;
Fig. 2 is a partly form schematic diagram of a packet with VLAN label;
Fig. 3 one can support the network configuration exemplary plot of IGMP multicast function and functionality of vlan simultaneously;
Fig. 4 (a) is arranged on a VLAN table of comparisons exemplary plot in the switching hub of the present invention;
The ip multicast that Fig. 4 (b) is arranged in the switching hub of the present invention is represented illustration;
The label that Fig. 4 (c) is arranged in the switching hub of the present invention is changed rule list;
Fig. 5 is that the present invention controls the preferable implementation method flow chart that packet transmits in the switching hub.
Embodiment
Fig. 3 one can support the network configuration exemplary plot of IGMP multicast function and functionality of vlan simultaneously, wherein work station 30 is by P 31, utilize the IGMP multicasting technology that data are sent in the disclosed switching hub 32 the 5th connectivity port as uplink port (uplink port), and be equipped with can identification the client 331 of network interface card (hereinafter to be referred as the VLAN network interface card) of VLAN label, client 332, client 333 and client 334 are to be connected to first of this switching hub 32, two, the three and the 4th connectivity port, and client 331, client 332, client 333 and client 334 are the Internet group that add this work station 30 simultaneously.
Fig. 4 (a) is arranged on the VLAN table of comparisons exemplary plot in the switching hub 32 of the present invention, it is in order to according to the VLAN identification code (VID) in the VLAN label of received packet and correspondence goes out a virtual net port mask and a label ancillary rules (VLAN tag rule), for instance, when the VID of the packet that receives is a default value 1, when representing all connectivity ports all to belong to this VLAN, the bit data of the virtual net port mask that correspondence goes out is 11111, and the label ancillary rules is the additional VLAN label (untag) of the neither need of packet of all outputs.And when the VID of the packet that receives value is 10, have only first, second connectivity port to belong to this VLAN, so the bit data of virtual net port mask is 11000, and the label ancillary rules is the additional VLAN label (tag) of packet that will be exported by first, second connectivity port.As for when the VID of the packet that receives value is 20, have only the 3rd, the 4th connectivity port to belong to this VLAN, so the bit data of virtual net port mask is 00110; In this embodiment, the network interface card of the client that cause the 3rd connectivity port is connected can only receive the packet (tag packet) with the VLAN label, and the network interface card of the client that the 4th connectivity port is connected receives only the packet (untag packet) of not having the VLAN label, therefore the label ancillary rules is part additional (00100), be about to by the additional VLAN label of the packet of the 3rd connectivity port output, the packet that export the 4th connectivity port is then deleted the VLAN label.
The ip multicast that Fig. 4 (b) is arranged in the switching hub 32 of the present invention is represented illustration, and its target ip address according to receiving packet comes correspondence to go out a multicast port mask, as the foundation of follow-up data transmission.Suppose client 331, client 332, client 333 and client 334 are to add simultaneously that multicast group identification code is in the customer group of 224.1.1.5 in the work station 30, and when the ip multicast address of work station 30 packet of sending is 224.1.1.5, the switching hub 32 that can support IGMP is when receiving the packet that target ip address is 224.1.1.5, the corresponding multicast port mask bit data that goes out will be 11110, and then make can be by first from the packet of work station 30, second, the the 3rd and the 4th connectivity port is sent to client 331, client 332, client 333 and client 334.The label that is stored in the label replacing rule list shown in Fig. 4 (c) is changed the regular all additional corresponding VLAN label of the packet of being exported by the first, second, third and the 4th connectivity port that then is, and then the value of VID is replaced as 10 by the packet that export first, second connectivity port, the packet of being exported by the 3rd, the 4th connectivity port then is replaced as 20 with the value of VID, and the value that corresponds to the displacement identification code of each connectivity port is to be stored in to correspond in the set displacement identification code buffer in each connectivity port.
And in order to solve the shortcoming of existing means, the present invention is the transmission of controlling packet in the switching hub 32 with method flow diagram shown in Figure 5.At first, when switching hub 32 receives a packet, judge whether to contain the VLAN label earlier, then VLAN identification code VID is not made as default value (this routine default value is 1) if having; Directly this VLAN table of comparisons is tabled look-up if having then according to the VID in the VLAN label of this packet, and then correspondence goes out a virtual net port mask and a label ancillary rules, according to the target ip address of this packet this ip multicast table is tabled look-up again subsequently, and then correspondence goes out a multicast port mask.For providing the webmaster personnel to carry out function selecting, being provided with a flag buffer in the switching hub 32 of the present invention stores one and crosses over and to forbid flag, and when leap forbids that flag is set up, switching hub 32 just according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and respectively this packet being sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.And when leap forbids that flag is eliminated, switching hub 32 just according to this multicast port mask the corresponding connectivity port that goes out and respectively this packet being sent, the label setting device is then changed rule according to this label ancillary rules and label, optionally corresponding VLAN label is attached on this packet.
Person skilled in the art scholar should understand the mode that multiple judgement multicast package is arranged, for example also can be by the value of the target MAC (Media Access Control) address in the package, for example be 01005E beginning person, promptly be judged to be the multicast package, can be according to system manager's planning, activate and cross over the VLAN pattern, make the multicast package can successfully send to user's end.
Below attempting an example describes, when leap forbids that flag is eliminated, be meant that the so-called VLAN pattern (cross VLAN mode) of crossing over is activated, and sent by work station 30, target ip address is that the no label data bag of 224.1.1.5 is when entering switching hub 32 by uplink port, because the default value of its VLAN identification code VID is 1, then after the VLAN table of comparisons shown in Fig. 4 (a) is tabled look-up, correspondence gone out bit data be 11111 virtual net port mask and " untag " the label ancillary rules.And table look-up to the ip multicast table shown in Fig. 4 (b) according to the target ip address (224.1.1.5) of receiving packet, can be corresponding go out bit data and be 11110 multicast port mask, but forbid that flag is eliminated owing to cross over, therefore according to flow chart shown in Figure 5, only need the connectivity port (first that goes out according to this multicast port mask (11110) institute correspondence this moment, second, the the 3rd and the 4th connectivity port) respectively this packet is sent, and change rule according to this label shown in Fig. 4 (c) and decide which new value is the value of VID be replaced by, by this example, by first, the packet that export second connectivity port should be replaced by 10 with the value of VID, and by the 3rd, the packet that export the 4th connectivity port then should should be replaced by 20 with the value of VID, and according to each VID the corresponding label ancillary rules that goes out carry out the additional action of label.So, the packet that export first, second connectivity port in this example is to have the VLAN label and the VID value has been replaced by 10, the packet of being exported by the 3rd connectivity port then also has the VLAN label and the VID value then has been replaced by 20, the packet that export the 4th connectivity port does not then have the VLAN label, thus can to the output selectivity of many connectivity ports add corresponding VLAN label.
The network switch that the present invention discloses has a plurality of connectivity ports, in order to reception and the transmission of carrying out packet.The network switch comprises label and changes rule list, and it is used for stored tag and changes rule; The VLAN table of comparisons can correspondence go out virtual net port mask and label ancillary rules in order to the value according to the VLAN label; The multicast table of comparisons, it is in order to according to the multicast information of this packet and correspondence goes out the multicast port mask; Label setting device, signal are connected to this VLAN table of comparisons and this multicast table of comparisons; And cross over and forbid flag.When leap forbids that flag is eliminated, the network switch just according to this multicast port mask the corresponding connectivity port that goes out and respectively this packet being sent, the label setting device is then changed rule according to this label ancillary rules and label, optionally corresponding VLAN label is attached on this packet.When leap forbids that flag is set up, switch just according to the formed common factor port mask of multicast port mask and virtual net port mask the corresponding connectivity port that goes out and respectively this packet being sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
In sum, the switching hub of utilization the inventive method, even be connected to the client that the VLAN network interface card is housed, also can be compatible with in the VoD network structure of IGMP multicast function, the client that the packet that is sent in the multicast mode also can be equipped with the VLAN network interface card is received, thereby finish the transmission of data, effectively improve the shortcoming of above-mentioned existing means, realize development main purpose of the present invention.
The present invention can carry out multiple variation, modification by person skilled in the art scholar, however the scope that neither disengaging appended claims is defined.
Claims (10)
1. a data package transmitting method is applied to one and has on the network switch of a plurality of connectivity ports, it is characterized in that comprising the following step:
This network switch receives a packet;
This network switch is according to the multicast information of this packet and correspondence goes out a multicast port mask and a label is changed rule;
According to the vlan information of the packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules; And
When a leap forbids that flag is set up, this network switch according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
2. data package transmitting method as claimed in claim 1, it is characterized in that, wherein according to the multicast information of this packet and the corresponding step that goes out this multicast port mask is: come a multicast table of comparisons that is arranged in this network switch is tabled look-up according to the destination address in this packet, and then correspondence goes out this multicast port mask.
3. data package transmitting method as claimed in claim 2 is characterized in that, wherein this multicast table of comparisons is an ip multicast table.
4. data package transmitting method as claimed in claim 2 is characterized in that, wherein this destination address is a target MAC (Media Access Control) address.
5. data package transmitting method as claimed in claim 2 is characterized in that, wherein this destination address is a purpose IP address.
6. data package transmitting method as claimed in claim 1, it is characterized in that, wherein according to the vlan information of this packet and the corresponding step that goes out this virtual net port mask is: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this virtual net port mask.
7. data package transmitting method as claimed in claim 1, it is characterized in that, wherein according to the vlan information of this packet and the corresponding step that goes out this label ancillary rules is: come a VLAN table of comparisons that is arranged in this network switch is tabled look-up according to the VLAN identification code in this packet, and then correspondence goes out this label ancillary rules.
8. data package transmitting method as claimed in claim 1, it is characterized in that, wherein when this leap forbids that flag is eliminated, this network switch according to this multicast port mask the corresponding connectivity port that goes out and this packet is sent, and, optionally corresponding VLAN label is additional to this packet according to interior this label ancillary rules and this label replacing rule that is built in this network switch.
9. network switch is characterized in that comprising:
A plurality of connectivity ports, its reception and transmission in order to carry out packet;
One label is changed rule list, and it changes rule in order to store a label;
The one VLAN table of comparisons is in order to according to the vlan information of this packet that is received and correspondence goes out a virtual net port mask and a label ancillary rules;
The one multicast table of comparisons, it is in order to according to the multicast information of this packet and correspondence goes out a multicast port mask;
One label setting device, signal are connected to this VLAN table of comparisons and this multicast table of comparisons, and it optionally appends to this packet with corresponding VLAN label in order to change rule according to this label ancillary rules and this label; And
Flag is forbidden in one leap;
Wherein when this leap forbids that flag is set up, this network switch according to this multicast port mask and the formed common factor port mask of this virtual net port mask the corresponding connectivity port that goes out and this packet is sent, and optionally corresponding VLAN label is attached on this packet according to this label ancillary rules.
10. the network switch as claimed in claim 9, it is characterized in that, wherein when this leap of this network switch forbids that flag is eliminated, this network switch only according to this multicast port mask the corresponding connectivity port that goes out and this packet is sent, and, optionally corresponding VLAN label is additional to this packet according to interior this label ancillary rules and this label replacing rule that is built in this network switch.
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| CN101765183B (en) * | 2009-12-31 | 2012-11-28 | 中兴通讯股份有限公司 | Method and device thereof for directly accessing to core network by user |
| CN102055641A (en) * | 2010-12-28 | 2011-05-11 | 华为技术有限公司 | Distribution method for virtual local area network and related device |
| CN105530156A (en) * | 2014-10-22 | 2016-04-27 | 深圳市中兴微电子技术有限公司 | Virtual local area network tag processing device and method of ONU (Optical Network Unit) |
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| JPH11331237A (en) * | 1998-05-20 | 1999-11-30 | Hitachi Ltd | Method and device for repeating multicast packet |
| US6181699B1 (en) * | 1998-07-01 | 2001-01-30 | National Semiconductor Corporation | Apparatus and method of assigning VLAN tags |
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| US5959989A (en) * | 1997-06-25 | 1999-09-28 | Cisco Technology, Inc. | System for efficient multicast distribution in a virtual local area network environment |
| JPH11331237A (en) * | 1998-05-20 | 1999-11-30 | Hitachi Ltd | Method and device for repeating multicast packet |
| US6181699B1 (en) * | 1998-07-01 | 2001-01-30 | National Semiconductor Corporation | Apparatus and method of assigning VLAN tags |
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