CN1543132A - Method for implementing multicast spanning VLAN - Google Patents
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Abstract
This invention discloses a method for realizing multicast of crossing over the VLAN including: when a two-layer exchanger detects that user ends from different VLAN send a same multicast request, it adds into a multicast address table the address, the VLAN belonged corresponding downstream port numbers and ID of the MAC and adds into the multicast address list the MAC address, VLAN belonged corresponding downstream port number and up-line port default VLAN ID. When a three-layer device receives a same multicast request from different VLAN, it sends down the multicast data report without VLAN ID to the two-layer exchanger which duplicates it and sends the duplication to the user ends sending the same request based on the address list so as to reduce resource occupation.
Description
Technical field
The present invention relates to the multicasting technology in the communication system, particularly about on two-layer switching equipment, carrying out the implementation method of cross-VLAN (VLAN) multicast.
Background technology
Internet Protocol (IP) multicast is meant that the information source main frame is sent to some with information and determines to receive the communication form of the point of main frame to multiple spot.Its basic thought is that source IP main frame only sends a piece of data, and one or more recipients can receive the copy of identical data, and this part recipient can be described as multicast group in logic.
In the prior art, when from the identical multicast data message of the user terminal requests of different VLAN, the process of IP multicast is as follows:
A. the user terminal that belongs to different VLAN sends identical multicast data message request to three-layer equipment.
B. when Layer 2 switch listens to the multicast data message request, recording-related information, and multicast media interviews control (MAC) address and the corresponding end slogan that listens to added in the Layer 2 switch multicast address.
C. when three-layer equipment is received multicast data message request from different VLAN, multicast data message is duplicated many parts, and each multicast data message duplicate is added corresponding VLAN ID, and the multicast data message duplicate that will contain VLAN ID then sends to Layer 2 switch.
D. after Layer 2 switch is received the multicast data message duplicate that contains VLAN ID, the multicast data message duplicate is forwarded in the corresponding port according to the multicast address of correspondence.
As shown in Figure 1, Layer 2 switch comprises several downlink port and a default uplink port, and wherein port one, 2,3 is a downlink port, and port 25 is default uplink port.Port one, 2,3,25 default VLAN ID are respectively vlan1, vlan2, vlan3, vlan25; When the user who belongs to vlan1, vlan2, vlan3 respectively when three-layer equipment sends same multicast address request, Layer 2 switch is intercepted the multicast data message request, and MAC Address and corresponding end slogan are added in the Layer 2 switch multicast address.
The all corresponding fixing uplink and downlink port of each VLAN ID, the corresponding port one, 25 of vlan1; The corresponding port 2,25 of vlan2; The corresponding port 3,25 of vlan3, the corresponding port one, 2,3,25 of vlan25.When three-layer equipment is received from the same multicast request among vlan1, vlan2, the vlan3, same multicast data message is duplicated three parts, in these three parts of multicast data message duplicates, add that vlan1, vlan2, vlan3 are issued to Layer 2 switch with the duplicate of multicast data message then respectively; After Layer 2 switch is received the multicast data message that contains VLAN ID, search multicast address according to VLAN ID, obtain corresponding port numbers 1,2,3 respectively, Layer 2 switch is that to be forwarded to port numbers be 1 equipment for the multicast message of vlan1 with VLAN ID then, with VLAN ID is that to be forwarded to port numbers be 2 equipment for the multicast message of vlan2, with VLAN ID be the multicast message of vlan3 to be forwarded to port numbers be 3 equipment, finish the forwarding of multicast message.
Can know that from said process when the different port user asked same multicast data message, three-layer equipment will duplicate many parts with same multicast data message, and all duplicates of the multicast data message that this VLAN ID is different send to Layer 2 switch.When multicast member more for a long time, this multicast mode will take the bandwidth of three-layer equipment in a large number, the restriction multicast group that three-layer equipment is supported quantity.Such as, have 20 different VLAN users to ask same multicast data message, and if this multicast data message occupied bandwidth be 5M, to take total bandwidth be 100M to the multicast data message that issues from three-layer equipment so.And generally, link to each other by 100,000,000 ports between two three-layer equipments.Like this, after bandwidth is occupied by the data of same multicast group, all the other users can't normally use network, also can't ask other multicast services more simultaneously.Therefore, this have the great waste bandwidth resource of multicast mode of same multicast packet request for different VLAN ID, and its application also is very limited.
Summary of the invention
In view of this, the invention provides a kind of implementation method of multicast spanning virtual local area networks, make it in the process of the same data message of multicast, the system resource that reduces three-layer equipment inside take and two, the bandwidth resources between the three-layer equipment take, and then guarantee that under the more situation of multicast member the system that also can not influence normally moves.
The implementation method of a kind of cross-VLAN (VLAN) multicast is applied to the Layer 2 switch multicast, and this method is achieved in that
A. when Layer 2 switch listens to same multicast request from the user terminal of different VLAN, with the downstream end slogan of the control of the multicast media interviews in this multicast request (MAC) address, affiliated VLAN correspondence and the sign (ID) of affiliated VLAN, add in the multicast address, downstream end slogan and the uplink port default VLAN ID with multicast mac address, affiliated VLAN correspondence adds in the multicast address simultaneously;
When B. three-layer equipment is received same multicast request message from different VLAN, the multicast data message with VLAN ID is not issued to Layer 2 switch;
C. after Layer 2 switch is received the not multicast data message with VLAN ID that three-layer equipment issues, ID is added in the multicast data message with the uplink port default VLAN, duplicate described multicast data message, and search the corresponding downstream port according to the described multicast address of steps A, then according to the corresponding downlink port that finds, the multicast data message duplicate is sent to the user terminal that sends same multicast request and belong to different VLAN respectively.
This method further comprises: when Layer 2 switch listens to after multicast data message leaves, empty multicast address.
Described multicast address is (a MAC Address, port numbers) and (VLAN ID, port numbers) two two tuple list items, described (VLAN ID, port numbers) comprises uplink port default VLAN ID pairing (uplink port default VLAN ID, port numbers) list item in the list item at least.
Add described in the step B is that downstream end slogan with multicast multicast mac address and affiliated user vlan correspondence adds (MAC Address to, port numbers) in the list item, simultaneously according to affiliated user vlan ID, add the downstream end slogan of user vlan correspondence under this to pairing (VLAN ID, port numbers) in the list item and in uplink port default VLAN ID pairing (uplink port default VLAN ID, the port numbers) list item.
Described multicast address is (MAC Address, port numbers, VLAN ID) tlv triple list item.
Adding described in the step B is that MAC Address, port numbers and corresponding user vlan ID are added in the multicast address, simultaneously this multicast multicast mac address and port numbers is added in the multicast address in the pairing list item of uplink port default VLAN ID.
Duplicate further described in the step C and comprise: when Layer 2 switch receive that three-layer equipment issues not with the multicast data message of VLAN ID the time, duplicate with multicast address in the same number of duplicate of uplink port default VLAN ID corresponding port, find corresponding downlink port from multicast address then, described duplicate is issued from the corresponding downlink port that finds.
When Layer 2 switch receive that three-layer equipment issues not with the multicast data message of VLAN ID the time, duplicate further described in the step C and comprise:
C01, from multicast address, find out a downlink port, duplicate a multicast data message then, described duplicate is issued from the downlink port that finds out;
C02, judge whether to handle all downlink ports, if do not have, then return step C01, otherwise multicast packet issues and finishes.
Step C further comprises:
C11. according to the multicast multicast mac address of multicast data message, from address table, find one group of corresponding port numbers,, from the list item of (VLAN ID, port numbers), search the one group of port numbers that is comprised simultaneously according to uplink port default VLAN ID;
C12. the common factor of getting two groups of port numbers finding partly is the set that needs the port numbers of multicast message;
C13. duplicate described multicast data message, and the described number that needs to contain ports having in the set of multicast message port numbers that obtains among number of copies and the step C12 equates, and, the multicast data message duplicate is sent to the user terminal that has same multicast request and belong to different VLAN by the corresponding port according to the set of the port numbers of described needs multicast message.
Step C further comprises:
C21. according to the multicast multicast mac address and the uplink port default VLAN ID of multicast data message, find uplink port default VLAN ID, multicast mac address and pairing port numbers from multicast address, the VLAN ID that uplink port is default is added on the multicast data message;
C22. duplicate described multicast data message, and, the described port number that needs to contain in the set of multicast message port numbers that obtains among number of copies and the step C21 equates, and, the multicast data message duplicate is sent to the user terminal that has same multicast request and belong to different VLAN by the port that finds among the step C21 respectively according to the set of the port numbers of described needs multicast message.
The present invention is by the layer 2-switched listening functions of expansion, and utilize the default VLANID of uplink port to realize the multicast of the same data message of travelling across VLAN, the system resource that this method not only can reduce three-layer equipment takies, and can save two, the bandwidth resources between the three-layer equipment, reduce investment outlay, promoted the popularization of multicast service greatly.
Description of drawings
Fig. 1 in the prior art from the user of different VLAN and have the embodiment schematic diagram of the multicast of same multicast request;
Fig. 2 for the present invention for from the user of different VLAN and multicast schematic flow sheet with same multicast request;
Fig. 3 is for realizing the multicast schematic diagram of specific embodiments of the invention.
Embodiment
Core content of the present invention is: when Layer 2 switch listens to multicast request from different VLAN, when adding multicast address to multicast address, again multicast address is added to uplink port default VLAN list item in the multicast address, form the multicast address of travelling across VLAN, thereby realize the multicast of travelling across VLAN.Here,, can be forwarded to the user of multicast request, therefore this multicast mode is called the multicast of travelling across VLAN by multicast address and uplink port default VLAN though each has the user vlan of multicast request to have nothing in common with each other.
Need to prove, in networking is used, for Layer 2 switch, in order to isolate the user under the different port, each user is distributed different VLAN ID, because subscriber's main station is a supported vlans not, so the default VLAN ID of user port is equivalent to user's VLAN ID.When Layer 2 switch listens to the multicast request of the different VLAN ID of each user port band, corresponding multicast address is added in the list item of corresponding VLANID, formation is to the multicast address of each VLAN, at this moment must according to the list item multicast data forwarding message of corresponding VLAN, have the user of multicast request just can receive multicast data message.And after any one does not enter into Layer 2 switch with the message of VLAN ID, all can add the default VLAN ID of corresponding port automatically, Layer 2 switch is transmitted this multicast data message according to the default VLAN ID and the multicast mac address of message again.
Therefore,, avoid three-layer equipment to duplicate and transmit many parts of same multicast data messages and waste the system bandwidth resource in a large number, realize the present invention by expansion multicast listening functions here in order to realize the multicast of travelling across VLAN.That is, when Layer 2 switch listens to multicast request from different VLAN, multicast address is added among the default VLAN ID of corresponding VLAN ID and uplink port simultaneously.
In order to finish the multicast of realizing travelling across VLAN, behind the expansion multicast listening functions, all downlink ports and uplink port are included in the default VLAN of uplink port simultaneously.When three-layer equipment will be not be issued to Layer 2 switch with the multicast message of virtual local area network No., layer 2-switched uplink port adds the default virtual local area network No. of the port in the multicast message to, because all have the port of multicast request to be added in the default VLAN of uplink port, this multicast message will carry out multicast in this VLAN.So from the angle of uplink port, this is the multicast that takes place in same VLAN,, then be the equal of the multicast that in different VLANs, takes place still from the angle of downlink port.
Referring to shown in Figure 2, travelling across VLAN multicast of the present invention implementation procedure as follows:
Step 201, several main frames send the same multicast request message of several different VLAN to three-layer equipment.
Step 202, when Layer 2 switch listens to the same multicast request of different VLAN, recording-related information, the target MAC (Media Access Control) address and the corresponding VLAN ID of multicast are added in the multicast address, simultaneously VLAN ID is added in the uplink port default VLAN, form the multicast address of travelling across VLAN.
Owing in the Layer 2 switch of supported vlans, have independent VLAN study (IVL) pattern and shared VLAN study (SVL) pattern, be used for two kinds of different address learning modes.For the IVL pattern, there is (MAC Address Layer 2 switch inside, port numbers) and (VLAN ID, port numbers) two two tuple list items, so the same MAC Address under the different VLAN, only MAC Address need be joined (MAC Address, port numbers) list item after, can guarantee promptly that by the list item of revising (VLAN ID, port numbers) MAC Address belongs to a plurality of VLAN; For the SVL pattern, the address table of Layer 2 switch inside is (MAC Address, VLAN ID, port numbers) list item of tlv triple, the corresponding MAC address entries of each VLAN ID for the same MAC Address under the different VLAN, must add it in the list item under the different VLAN.
From top explanation as can be seen, the MAC Address list item of two kinds of address learning mode internal is different, and therefore, the process of the multicast list of formation travelling across VLAN is also inequality.Under the IVL pattern, when adding to MAC Address, port numbers in the multicast address, also need to upgrade the default VLAN ID list item of uplink port, this multicast address corresponding port number is added in the default VLAN ID list item of uplink port to the multicast address list item that formation can the travelling across VLAN multicast; Under the SVL pattern, the list item of MAC Address, port numbers and corresponding VLAN ID is added in the address table, also need the default VLAN ID of this MAC Address and port numbers and uplink port is added in the address table multicast address list item that formation can the travelling across VLAN multicast simultaneously.
Specifically, for the IVL pattern, when Layer 2 switch listens to the same multicast data message request of different VLAN, target MAC (Media Access Control) address, user vlan ID and this VLAN ID corresponding port of multicast are added in the multicast address, form a multicast address list item, also the VLAN ID of this multicast mac address, user port and uplink port correspondence will be added in the multicast address simultaneously, form another multicast address list item, ginseng is shown in Table 1.
| MAC Address | VLAN?ID | Port numbers |
| MAC Address | Uplink port default VLAN ID | Port numbers |
Table 1
For the SVL pattern, when Layer 2 switch listens to the same multicast data message request of different VLAN, number add multicast mac address and corresponding port to (MAC Address, port numbers) in the list item, simultaneously according to the pairing user vlan ID of this port, add this port numbers to pairing (VLAN ID, port numbers) in the list item, and this port to be added to pairing (the uplink port default VLAN ID of uplink port default VLAN ID, port numbers) in the list item, ginseng is shown in Table 2.
| MAC Address | Port numbers |
| ??VLAN?ID | Port numbers |
| Default VLAN ID | Port numbers |
Table 2
When step 203, three-layer equipment are received from the same multicast request message of different VLAN, the multicast data message with VLAN ID not is issued to Layer 2 switch.
After step 204, Layer 2 switch are received the not multicast data message with VLAN ID that three-layer equipment issues, the duplicated multicast data message, and the multicast address number that contains in number of copies and the multicast address is identical, and, the multicast data message duplicate is sent to the main frame that same multicast request is arranged from corresponding ports according to the default VLAN ID of uplink port.
After Layer 2 switch is received the not multicast data message with VLAN ID that three-layer equipment issues from uplink port, because this data message is not with VLAN ID, this moment, the VLAN ID of multicast data message was the default VLAN ID of uplink port, Layer 2 switch at first adds the default VLAN ID of this uplink port to the correspondence position of multicast data message, carries out address search then.Here, at two kinds of address learning pattern differences in the Layer 2 switch, the process of carrying out address search also is divided into two kinds.
First kind, concerning the IVL pattern,, from multicast address, directly find uplink port default VLAN ID and multicast mac address and pairing port numbers according to the target MAC (Media Access Control) address of multicast message and the default VLAN ID of uplink port.
Second kind, concerning the SVL pattern, at first will be according to multicast mac address, from address table, find one group of corresponding port numbers, simultaneously according to uplink port default VLAN ID from (VLAN ID, port numbers) searches one group of port numbers that default VLAN ID is comprised in the list item, and then two groups of port numbers finding are got common factor, needing to obtain the set of the port numbers of multicast message.
Certainly, the reproduction process that Layer 2 switch carries out data message can comprise two kinds of situations: a kind of is after having searched multicast address, concrete number according to the same multicast user who finds duplicates, also can duplicate duplicate earlier with the consistent number of multicast address list item, carrying out multicast address again searches, find a downlink port, just send a duplicate from the downlink port that finds, corresponding downlink port all issues and finishes in according to multicast address.At last, the unnecessary duplicate of deletion gets final product.
And if the port of finding has only one, Layer 2 switch directly is dealt into the corresponding port that finds with the multicast data message duplicate, and the user under this port just can receive multicast data message; If more than one of the port of finding, Layer 2 switch will be according to the number of the multicast address that writes down in the multicast address, duplicate this multicast data message, then multicast data message is dealt on the port that finds, each has the user under the port of multicast request just can receive multicast data message simultaneously.Because the user of each port belongs to different VLAN, but can receive identical multicast data message, so it seems from user side, has just realized the multicast of travelling across VLAN.
Referring to shown in Figure 3, the default VLAN ID of port 25 is vlan25, and vlan25 comprises port one, 2,3 simultaneously; The default VLAN ID of port one is vlan1, and vlan1 comprises port 25 simultaneously; The default VLAN ID of port 2 is vlan2, and vlan2 comprises port 25 simultaneously; The default VLAN ID of port 3 is vlan3, and vlan3 comprises port 25 simultaneously; And port 25 is a uplink port, and port one, 2,3 is a downlink port.
Sending same multicast address request with the user terminal from vlan1, vlan2, vlan3 is example, and present embodiment adopts the multicast address of tlv triple structure, realizes that then the process of multicast is as follows:
The user terminal of A.vlan1, vlan2, vlan3 sends same group of request message to three-layer equipment respectively.
B. working as Layer 2 switch listens to from three vlan, during the same multicast request of vlan1, vlan2, vlan3, recording-related information, respectively vlan1, vlan2, vlan3 and corresponding multicast mac address are added in the corresponding VLAN of multicast address, simultaneously it is added in the uplink port default VLAN, form the multicast address of travelling across VLAN.
Suppose that multicast mac address is 01005E7FFFFF, when Layer 2 switch listened to from the same multicast request of vlan1, vlan2, vlan3, the multicast address of formation was as shown in table 3, and wherein, last is the multicast address list item of travelling across VLAN.
| ?01005E7FFFFF | ?Vlan1 | Port one |
| ?01005E7FFFFF | ?Vlan2 | Port 2 |
| ?01005E7FFFFF | ?Vlan3 | Port 3 |
| ?01005E7FFFFF | ?Vlan25 | Port one, port 2, port 3 |
Table 3
C. three-layer equipment is received from vlan1, and vlan2 after the same multicast request among the vlan3, is issued to Layer 2 switch with the multicast data message with VLAN ID not.
D. after Layer 2 switch is received the multicast data message of not being with VLAN ID, the VLAN ID that uplink port is default, it is port 25, be added in this multicast data message, again according to the multicast address list item of travelling across VLAN, find this multicast address, vlan25 corresponding port numbers 1,2,3 from multicast address, then multicast data message is duplicated three parts and be forwarded to port one, port 2,3 times corresponding equipment of port respectively, finish the forwarding of multicast message.
From said process as can be seen, after three-layer equipment will be not be issued to Layer 2 switch with the multicast data message of VLAN ID, Layer 2 switch adds the default VLAN ID of corresponding port automatically, according to the multicast address of travelling across VLAN multicast data message is transmitted then, realized the multicast of travelling across VLAN.When the multicast data message that issues when three-layer equipment had corresponding VLAN ID, Layer 2 switch will be transmitted according to the VLAN multicast table of normal generation, has guaranteed the normal group multicast function.
Step 205, listen to user's multicast leave group message when Layer 2 switch after, from the default VLAN of user vlan and uplink port, remove this multicast address.Here, for guaranteeing that multicast functionality normally carries out.When carrying out the multicast of travelling across VLAN, the multicast address of travelling across VLAN is safeguarded.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1, the implementation method of a kind of cross-VLAN (VLAN) multicast is applied to the Layer 2 switch multicast, it is characterized in that this method may further comprise the steps:
A. when Layer 2 switch listens to same multicast request from the user terminal of different VLAN, with the downstream end slogan of the control of the multicast media interviews in this multicast request (MAC) address, affiliated VLAN correspondence and the sign (ID) of affiliated VLAN, add in the multicast address, downstream end slogan and the uplink port default VLAN ID with multicast mac address, affiliated VLAN correspondence adds in the multicast address simultaneously;
When B. three-layer equipment is received same multicast request message from different VLAN, the multicast data message with VLAN ID is not issued to Layer 2 switch;
C. after Layer 2 switch is received the not multicast data message with VLAN ID that three-layer equipment issues, ID is added in the multicast data message with the uplink port default VLAN, duplicate described multicast data message, and search the corresponding downstream port according to the described multicast address of steps A, then according to the corresponding downlink port that finds, the multicast data message duplicate is sent to the user terminal that sends same multicast request and belong to different VLAN respectively.
2, method according to claim 1 is characterized in that, this method further comprises:
When Layer 2 switch listens to after multicast data message leaves, empty multicast address.
3, method according to claim 1, it is characterized in that, described multicast address is (a MAC Address, port numbers) and (VLAN ID, port numbers) two two tuple list items, at least comprise uplink port default VLAN ID pairing (uplink port default VLAN ID, port numbers) list item in described (VLAN ID, port numbers) list item.
4, method according to claim 3, it is characterized in that, add described in the step B is that downstream end slogan with multicast multicast mac address and affiliated user vlan correspondence adds (MAC Address to, port numbers) in the list item, simultaneously according to affiliated user vlan ID, add to the downstream end slogan of user vlan correspondence under this in pairing (VLAN ID, port numbers) list item and uplink port default VLAN ID pairing (uplink port default VLAN ID, port numbers) list item in.
5, method according to claim 1 is characterized in that, described multicast address is (MAC Address, port numbers, VLAN ID) tlv triple list item.
6, method according to claim 5, it is characterized in that, adding described in the step B is that MAC Address, port numbers and corresponding user vlan ID are added in the multicast address, simultaneously this multicast multicast mac address and port numbers is added in the multicast address in the pairing list item of uplink port default VLAN ID.
7, method according to claim 1, it is characterized in that, duplicate further described in the step C and comprise: when Layer 2 switch receive that three-layer equipment issues not with the multicast data message of VLAN ID the time, duplicate with multicast address in the same number of duplicate of uplink port default VLAN ID corresponding port, find corresponding downlink port from multicast address then, described duplicate is issued from the corresponding downlink port that finds.
8, method according to claim 1 is characterized in that, when Layer 2 switch receive that three-layer equipment issues not with the multicast data message of VLAN ID the time, duplicate further described in the step C and comprise:
C01, from multicast address, find out a downlink port, duplicate a multicast data message then, described duplicate is issued from the downlink port that finds out; C02, judge whether to handle all downlink ports, if do not have, then return step C01, otherwise multicast packet issues and finishes.
9, according to claim 3 or 4 described methods, it is characterized in that step C further comprises:
C11. according to the multicast multicast mac address of multicast data message, from address table, find one group of corresponding port numbers,, from the list item of (VLAN ID, port numbers), search the one group of port numbers that is comprised simultaneously according to uplink port default VLAN ID;
C12. the common factor of getting two groups of port numbers finding partly is the set that needs the port numbers of multicast message;
C13. duplicate described multicast data message, and the described number that needs to contain ports having in the set of multicast message port numbers that obtains among number of copies and the step C12 equates, and, the multicast data message duplicate is sent to the user terminal that has same multicast request and belong to different VLAN by the corresponding port according to the set of the port numbers of described needs multicast message.
10, according to claim 5 or 6 described methods, it is characterized in that step C further comprises:
C21. according to the multicast multicast mac address and the uplink port default VLAN ID of multicast data message, find uplink port default VLAN ID, multicast mac address and pairing port numbers from multicast address, the VLAN ID that uplink port is default is added on the multicast data message;
C22. duplicate described multicast data message, and, the described port number that needs to contain in the set of multicast message port numbers that obtains among number of copies and the step C21 equates, and, the multicast data message duplicate is sent to the user terminal that has same multicast request and belong to different VLAN by the port that finds among the step C21 respectively according to the set of the port numbers of described needs multicast message.
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