CN102946353A - Virtual private local area network service network message forwarding method and edge device - Google Patents
Virtual private local area network service network message forwarding method and edge device Download PDFInfo
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Abstract
The invention provides a virtual private local area network service network message forwarding method and an edge device. For a message received by the edge device from a pseudo-wire, the method includes the following processing process: whether the destination MAC (media access control) address of the message is in the MAC table of the edge device is judged; if the destination MAC address of the message is in the MAC table of the edge device, then the source MAC address in the message is learnt and added into the MAC table, and the message is unicast. The virtual private local area network service network message forwarding method and the edge device can increase the message forwarding efficiency.
Description
Technical field
The present invention relates to data communication field, relate in particular to a kind of virtual private LAN service network message forwarding method and edge device.
Background technology
VPLS (Virtual Private LAN Service, the virtual special local area network service) is actually typical MPLS L2VPN technology, by the multiprotocol label switching (mpls) technology, the user who is dispersed on the diverse geographic location is coupled together at carrier network.From user's angle, whole MPLS network is transparent, just such as same two layers of virtual switching network.
Fig. 1 is the professional networking of typical VPLS.Wherein provider edge equipment PE1, PE2, PE3, PE4 form carrier network, provide VPLS professional to user CE1, CE2, CE3, CE4.Need to set up the interconnected PW of the whole network (Pseudo Wire, pseudo-line) between the PE, as shown in Figure 1.Be user's access between PE and the CE, i.e. AC (Access Connection, access link).Communication is based on MAC(Media Access Control, media access control between the user) the table forwarding, PE can learn user's MAC for transmitting simultaneously.
When user's message arrives from AC arrival PE, at first the source MAC in the message is learnt, and add in the MAC table, then transmit according to the inquiry of the purpose MAC in message MAC table.If inquire, then message repeating to the PW of correspondence.If inquiry less than, then broadcast, transmit to all PW.When user's message arrives PE from PW, at first the source MAC in the message is learnt, and add in the MAC table, then transmit according to the inquiry of the purpose MAC in message MAC table.If inquire, then message repeating to the AC of correspondence.If inquiry less than, then broadcast, transmit to all AC.
Like this will a problem, namely PE can learn all MAC and add in the MAC table, and no matter whether this MAC can use in the forwarding afterwards.The MAC that supposes user CE1 is that the MAC of MAC1, user CE4 is MAC4, and communicating by letter between CE1 and the CE4.After the message of CE1 arrived PE1, PE1 can learn MAC1 and add in the MAC table, then searches the MAC4 of CE4 in the MAC table.Do not find this moment, then sends message to PE2, PE3, PE4 respectively by PW2, PW3, PW4.After PE2, PE3, PE4 receive message from PW, acquire MAC1 and add in the MAC table, then transmit to AC2, AC3, AC4 respectively.All have MAC1 in the MAC of PE2, PE3, the PE4 table at this moment, but CE2 does not communicate by letter with CE1 with CE3, so MAC1 there is no need to exist.When having a large number of users, can cause the waste in MAC address entries space, reduce the utilance of MAC table.When the MAC address entries limited space, more can cause follow-up MAC not learn again, reduced the forward efficiency of message.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of virtual private LAN service network message forwarding method and edge device can improve message repeating efficient.
For solving the problems of the technologies described above, the invention provides a kind of virtual private LAN service network message forwarding method, its concrete technical scheme is as follows:
A kind of virtual private LAN service network message forwarding method is characterized in that, from the message that pseudo-line receives, comprises following processing procedure for edge device:
Judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device table, if the target MAC (Media Access Control) address of described message is in the MAC of this edge device table, then the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and the described message of unicast forwarding.
Further, the method also comprises: if the target MAC (Media Access Control) address of described message not in the MAC of this edge device table, the direct described message of multicast forwarding then.
Further, before receiving message on the pseudo-line, edge device also comprises: judge that the message that edge device receives is on the line on the access link or pseudo-.
Further, the method also comprises if it is to receive from access link that edge device receives message, judges further that then the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device shows, if, the described message of unicast forwarding then, if do not exist, the described message of multicast forwarding then.
Further, whether before the treatment step in the MAC of this edge device shows, also comprise following processing procedure at the target MAC (Media Access Control) address of further judging described message:
When judging that source MAC in the described message is whether in described MAC table, if do not exist, then described source MAC is learnt and add to described source MAC in the described MAC table after enter next treatment step; If, then directly enter next treatment step.
Be similarly and solve above-mentioned technical problem the present invention a kind of edge device also is provided, its concrete technical scheme is as follows:
A kind of edge device is characterized in that, comprising: memory cell, the first judging unit, unit and message repeating unit
Described memory cell is used for storing the MAC table of described edge device;
Described the first judging unit is used for receiving the message on the pseudo-line, judge that described message target MAC (Media Access Control) address is whether in described MAC table, if, then notify described unit that the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and notify described message repeating unit that described message is carried out unicast forwarding.
Further, if described the first judging unit also is used for the target MAC (Media Access Control) address of described message not at the MAC of this edge device table, then notify the direct multicast forwarding in described message repeating unit described message.
Further, this equipment also comprises: the second judging unit; Described the second judging unit is used for judging that the message that edge device receives is on the line on the access link or pseudo-, if message is on the pseudo-line, then described message is sent to described the first judging unit.
Further, described the second judging unit also be used for when the message of judging the edge device reception be on the access link the time, further judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device shows, if, notify described message repeating unit unicast forwarding described message, if do not exist, notify described message repeating unit multicast forwarding described message.
Further, described the second judging unit comprises: source address judgment sub-unit and destination address judgment sub-unit;
Described source address judgment sub-unit be used for when the message of judging the edge device reception be on the access link the time, judge that the source MAC of described message is whether in described MAC table, if not, then notify described unit that source MAC is learnt, described source MAC is added in the described MAC table, and give described destination address judging unit with described message transmissions, if then directly give described destination address judgment sub-unit with described message transmissions;
Described destination address judgment sub-unit is used for judging that whether the target MAC (Media Access Control) address of described message is at the MAC of this edge device table, if, notify on the described message of described message repeating unit unicast forwarding, if do not exist, notify described message repeating unit multicast forwarding described message.
The invention has the beneficial effects as follows:
The invention provides a kind of virtual private LAN service network message forwarding method and edge device PE and can improve message repeating efficient.In the method, when edge device PE receives message from pseudo-line PW, judge that the target MAC (Media Access Control) address of described message is whether in the MAC of described edge device PE table, if, then the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and message is carried out the clean culture transmission; To only qualified message being transmitted and only to qualified message study, can being improved the utilance in MAC address entries space, can improve message repeating efficient in this method; Clean culture sends message can improve message repeating efficient further.
Further, if the target MAC (Media Access Control) address of described message is not in the MAC of this edge device table in the inventive method, the direct described message of multicast forwarding then; Like this in the MAC table only storage satisfy source MAC in the Rule of judgment message, do not need to store all and receive source MAC in the message, do not meet the message of Rule of judgment for other, with multicast forwarding rather than study; Can further reduce the waste in MAC address entries space, improve the utilance in MAC address entries space.
Description of drawings
Fig. 1 is the professional typical networking diagram of VPLS;
Fig. 2 is a kind of flow chart of MAC address learning method in the embodiment of the invention one virtual private LAN service network;
Fig. 3 is the another kind of flow chart of MAC address learning method in the embodiment of the invention one virtual private LAN service network;
Fig. 4 is another flow chart of MAC address learning method in the embodiment of the invention one virtual private LAN service network;
Fig. 5 is a kind of structural representation of the embodiment of the invention one provider edge equipment PE;
Fig. 6 is the another kind of structural representation of the embodiment of the invention one provider edge equipment PE;
Fig. 7 is another structural representation of the embodiment of the invention one provider edge equipment PE;
Fig. 8 is the flow chart of MAC address learning method in the embodiment of the invention two virtual private LAN service networks.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Embodiment one:
General edge device in virtual private LAN service network is provider edge equipment, and following edge device all illustrates virtual private LAN service network message forwarding method of the present invention and edge device with the provider edge equipment example.
The virtual private LAN service network message forwarding method of the present embodiment from the message that pseudo-line receives, comprises following processing procedure for provider edge equipment:
Judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this provider edge equipment table, if the target MAC (Media Access Control) address of described message is in the MAC of this provider edge equipment table, then the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and the described message of unicast forwarding.
The virtual private LAN service network message forwarding method of the present embodiment also comprises: if the target MAC (Media Access Control) address of described message not in the MAC of this provider edge equipment table, the direct described message of multicast forwarding then.
As shown in Figure 2, the virtual private LAN service network message forwarding method of the present embodiment can comprise:
Step 101: provider edge equipment PE receives message from pseudo-line PW;
Step 102: whether the target MAC (Media Access Control) address of judging described message is in the MAC of described provider edge equipment PE table, if execution in step 103 then, execution in step 104 if not;
Step 103: the source MAC in the described message is learnt, and described source MAC is added in the described MAC table, and the described message of unicast forwarding;
Step 104: the source MAC in the message is not learnt, directly the described message of multicast forwarding.
The virtual private LAN service network message forwarding method of the present embodiment also comprised before provider edge equipment receives message on the pseudo-line: judge that the message that provider edge equipment receives is on the line on the access link or pseudo-.
Before step 101, can also comprise step 100: judge that the message that provider edge equipment receives is on the line on the access link or pseudo-.
Further, the virtual private LAN service network message forwarding method of the present embodiment can also comprise: if provider edge equipment reception message is to receive from access link, further judge that then the target MAC (Media Access Control) address of described message is whether in the MAC of this provider edge equipment shows, if, then according to described target MAC (Media Access Control) address with described message repeating (clean culture transmission) to the pseudo-line of correspondence, if do not exist, then broadcast described message (multicast transmission) to all pseudo-lines.
As shown in Figure 3, the virtual private LAN service network message forwarding method of the present embodiment can may further comprise the steps:
Step 200: provider edge equipment receives message;
Step 201: judge that the message that provider edge equipment receives is on the line on the access link or pseudo-, if begin to carry out from step 205 on the access link, if begin to carry out from step 202 on the pseudo-line;
Step 202: whether the target MAC (Media Access Control) address of judging described message is in the MAC of described provider edge equipment PE table, if execution in step 203 then, execution in step 204 if not;
Step 203: the source MAC in the described message is learnt, and described source MAC is added in the described MAC table, and the described message of unicast forwarding;
Step 204: the source MAC in the message is not learnt, directly the described message of multicast forwarding;
Step 205: judge that the target MAC (Media Access Control) address of message is whether in the MAC of this provider edge equipment table, if in execution in step 206, if not in execution in step 207;
Step 206: according to described target MAC (Media Access Control) address with described message repeating to the pseudo-line of correspondence;
Step 207: broadcast described message to all pseudo-lines.
The virtual private LAN service network message forwarding method of the present embodiment whether before the treatment step in the MAC of this provider edge equipment shows, also comprises following processing procedure at the target MAC (Media Access Control) address of further judging described message:
When judging that source MAC in the described message is whether in described MAC table, if do not exist, then described source MAC is learnt and add to described source MAC in the described MAC table after enter next treatment step; If, then directly enter next treatment step.
The concrete step 2050 and 2051 that source MAC is learnt that also comprised before execution in step 105, detailed process is with reference to as shown in Figure 4 virtual private LAN service network message forwarding method.
MAC address learning method the present embodiment also provides a kind of provider edge equipment PE in the corresponding above-mentioned virtual private LAN service network as shown in Figure 5, comprising: memory cell, the first judging unit, unit and message repeating unit;
Described memory cell is used for storing the MAC table of described provider edge equipment;
Described the first judging unit is used for receiving the message on the pseudo-line, judge that described message target MAC (Media Access Control) address is whether in described MAC table, if, then notify described unit that the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and notify described message repeating unit that described message is carried out unicast forwarding.
Further, if the first judging unit in the present embodiment also is used for the target MAC (Media Access Control) address of described message not at the MAC of this provider edge equipment table, then notify the direct multicast forwarding in described message repeating unit described message.
As shown in Figure 6, the provider edge equipment of the present embodiment also comprises: the second judging unit; Described the second judging unit is used for judging that the message that provider edge equipment receives is on the line on the access link or pseudo-, if message is on the pseudo-line, then described message is sent to described the first judging unit.
Further, the second judging unit also be used for when the message of judging the provider edge equipment reception be on the access link the time, further judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this provider edge equipment shows, if, notify described message repeating unit according to described target MAC (Media Access Control) address with described message repeating (the described message of unicast forwarding) to the pseudo-line of correspondence, if do not exist, notify described message repeating unit to broadcast described message (the described message of multicast forwarding) to all pseudo-lines.
Show such as Fig. 7, the second judging unit comprises among the present embodiment PE: source address judgment sub-unit and destination address judgment sub-unit;
Described source address judgment sub-unit be used for when the message of judging the provider edge equipment reception be on the access link the time, judge that the source MAC of described message is whether in described MAC table, if not, then notify described unit that source MAC is learnt, described source MAC is added in the described MAC table, and give described destination address judging unit with described message transmissions;
Described destination address judgment sub-unit is used for judging that whether the target MAC (Media Access Control) address of described message is at the MAC of this provider edge equipment table, if, notify described message repeating unit according to described target MAC (Media Access Control) address with described message repeating (the described message of unicast forwarding) to the pseudo-line of correspondence, if do not exist, notify described message repeating unit to broadcast described message (the described message of multicast forwarding) to all pseudo-lines.
Embodiment two:
For the better detailed process that virtual private LAN service network message forwarding method provided by the invention is described, the present embodiment is set forth the detailed process of the inventive method as example take the professional typical networking of VPLS shown in Figure 1.As shown in Figure 1, PE1, PE2, PE3, PE4 build the VPLS business, wherein entirely connect by PW between the PE.User CE1, CE2, CE3, CE4 are by PE1, PE2, PE3, PE4 access.
Step 1: the MAC of PE1, PE2, PE3, PE4 table is for empty under initial condition.As shown in table 1:
| Equipment | MAC | Outgoing interface |
| PE1 | ||
| PE2 | ||
| PE3 | ||
| PE4 |
Table 1
Begin to communicate by letter between step 2: CE1 and CE4, CE2 and the CE 3.The message of CE1, CE2, CE 3, CE4 transmission is as shown in table 2 at this moment:
| Message | Source MAC | Purpose MAC | Payload |
| PKT1 | MAC1 | MAC4 | .... |
| PKT2 | MAC2 | MAC3 | .... |
| PKT3 | MAC3 | MAC2 | .... |
| PKT4 | MAC4 | MAC1 | .... |
Table 2
PKT1 is the message that CE1 sends to CE4, and source MAC is MAC1, and purpose MAC is MAC4;
PKT2 is the message that CE2 sends to CE3, and source MAC is MAC2, and purpose MAC is MAC3;
PKT3 is the message that CE3 sends to CE2, and source MAC is MAC3, and purpose MAC is MAC2;
PKT4 is the message that CE4 sends to CE1, and source MAC is MAC4, and purpose MAC is MAC1;
Step 3: PE1, PE2, PE3, PE4 receive respectively PKT1, PKT2, PKT3, PKT4.On PE1:
1. 301 of execution graph 8: judge whether message is received from PW.PKT1 receives from AC1, therefore continues to carry out 302;
2. 302 of execution graph 8: judge that source MAC1 among the PKT1 is whether in the MAC of PE1 table.As shown in Table 1, therefore MAC1 continues to carry out 303 not in the MAC table;
3. 303 of execution graph 8: MAC1 is learnt, and join in the MAC table of PE1.
4. 304 of execution graph 8: judge that the purpose MAC4 of PKT1 is whether in the MAC of PE1 table.As shown in Table 1, therefore MAC4 continues to carry out 306 not in the MAC table;
5. 306 of execution graph 8: message is broadcasted processing.Herein for to send respectively a message to PW2, PW3, PW4.
Identical to the processing of PKT2, PKT3, PKT4 on PE2, PE3, PE4.Through this step, the MAC address entries on PE1, PE2, PE 3, the PE4 is as shown in table 3:
| Equipment | MAC | Outgoing interface |
| PE1 | MAC1 | AC1 |
| PE2 | MAC2 | AC2 |
| PE3 | MAC3 | AC3 |
| PE4 | MAC4 | AC4 |
Table 3
Step 4: PE1, PE2, PE 3, PE4 receive message from PW respectively.
PE1 receives message: PKT2, PKT3, PKT4;
PE2 receives message: PKT1, PKT3, PKT4;
PE3 receives message: PKT1, PKT2, PKT4;
PE4 receives message: PKT1, PKT2, PKT3;
The processing procedure of PE1, PE2, PE3, PE4 is identical, take PE1 as the example explanation.
On PE1, PKT2 is processed:
1. 301 of execution graph 8: judge whether message is received from PW.PKT2 receives from PW2, therefore continues to carry out 308;
2. 308 of execution graph 8: judge that purpose MAC 3 among the PKT2 is whether in the MAC of PE1 table.As shown in Table 3, therefore MAC 3 continues to carry out 306 not in the MAC table;
3. 306 of execution graph 8: message is broadcasted processing, send a message to AC1.
On PE1, PKT3 is processed:
1. 301 of execution graph 2: judge whether message is received from PW.PKT 3 receives from PW3, therefore continues to carry out 308;
2. 308 of execution graph 8: judge that purpose MAC2 among the PKT3 is whether in the MAC of PE1 table.As shown in Table 3, therefore MAC2 continues to carry out 306 not in the MAC table;
3. 306 of execution graph 8: message is broadcasted processing, send a message to AC1.
On PE1, PKT4 is processed:
1. 301 of execution graph 8: judge whether message is received from PW.PKT4 receives from PW4, therefore continues to carry out 203;
2. 308 of execution graph 8: judge that purpose MAC1 among the PKT4 is whether in the MAC of PE1 table.As shown in Table 3, therefore MAC1 continues to carry out 309 in the MAC table;
3. 309 of execution graph 8: judge that source MAC4 among the PKT4 is whether in the MAC of PE1 table.As shown in Table 1, therefore MAC4 continues to carry out 310 not in the MAC table;
4. 310 of execution graph 8: MAC4 is learnt, and join in the MAC table of PE1.
5. 305 of execution graph 8: message is carried out clean culture process, send a message to AC1.
After PE2, PE3, PE4 were disposed to the message of receiving, the MAC table on PE1, PE2, PE3, the PE4 was as shown in table 4:
Table 4
Step 5: CE1, CE2, CE3, CE4 continue to send PKT1, PKT2, PKT3, PKT4.All can find corresponding MAC to 302 among Fig. 8,308, and carry out unicast forwarding this moment in the process of processing.
MAC table on PE1, PE2, PE3, the PE4 can keep the state of table 4.From this table, can find out, the virtual private LAN service network message forwarding method of the present embodiment had both ensured the service efficiency (MAC that study is used) of MAC table in reality is transmitted, ensured again forward efficiency (after the mac learning, carrying out unicast forwarding).
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a virtual private LAN service network message forwarding method is characterized in that, from the message that pseudo-line receives, comprises following processing procedure for edge device:
Judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device table, if the target MAC (Media Access Control) address of described message is in the MAC of this edge device table, then the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and the described message of unicast forwarding.
2. virtual private LAN service network message forwarding method as claimed in claim 1 is characterized in that, the method also comprises: if the target MAC (Media Access Control) address of described message not in the MAC of this edge device table, the direct described message of multicast forwarding then.
3. virtual private LAN service network message forwarding method as claimed in claim 1 or 2 is characterized in that, also comprises before edge device receives message on the pseudo-line: judge that the message that edge device receives is on the line on the access link or pseudo-.
4. virtual private LAN service network message forwarding method as claimed in claim 3, it is characterized in that, also comprise: if edge device reception message is to receive from access link, further judge that then the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device shows, if, the described message of unicast forwarding then, if do not exist, the described message of multicast forwarding then.
5. virtual private LAN service network message forwarding method as claimed in claim 4 is characterized in that, whether before the treatment step in the MAC of this edge device shows, also comprises following processing procedure at the target MAC (Media Access Control) address of further judging described message:
When judging that source MAC in the described message is whether in described MAC table, if do not exist, then described source MAC is learnt and add to described source MAC in the described MAC table after enter next treatment step; If, then directly enter next treatment step.
6. an edge device is characterized in that, comprising: memory cell, the first judging unit, unit and message repeating unit;
Described memory cell is used for storing the MAC table of described edge device;
Described the first judging unit is used for receiving the message on the pseudo-line, judge that described message target MAC (Media Access Control) address is whether in described MAC table, if, then notify described unit that the source MAC in the described message is learnt, described source MAC is added in the described MAC table, and notify described message repeating unit that described message is carried out unicast forwarding.
7. edge device as claimed in claim 6 is characterized in that, if described the first judging unit also is used for the target MAC (Media Access Control) address of described message not at the MAC of this edge device table, then notifies the direct multicast forwarding in described message repeating unit described message.
8. such as claim 6 or 7 described edge devices, it is characterized in that, this equipment also comprises: the second judging unit; Described the second judging unit is used for judging that the message that receives is on the line on the access link or pseudo-, if message is on the pseudo-line, then described message is sent to described the first judging unit.
9. edge device as claimed in claim 8, it is characterized in that, described the second judging unit also be used for when the message of judging the edge device reception be on the access link the time, further judge that the target MAC (Media Access Control) address of described message is whether in the MAC of this edge device shows, if, notify described message repeating unit unicast forwarding described message, if do not exist, notify described message repeating unit multicast forwarding described message.
10. edge device as claimed in claim 9 is characterized in that, described the second judging unit comprises: source address judgment sub-unit and destination address judgment sub-unit;
Described source address judgment sub-unit be used for when the message of judging the edge device reception be on the access link the time, judge that the source MAC of described message is whether in described MAC table, if not, then notify described unit that source MAC is learnt, described source MAC is added in the described MAC table, and give described destination address judging unit with described message transmissions, if then directly give described destination address judgment sub-unit with described message transmissions;
Described destination address judgment sub-unit is used for judging that whether the target MAC (Media Access Control) address of described message is at the MAC of this edge device table, if, notify on the described message of described message repeating unit unicast forwarding, if do not exist, notify described message repeating unit multicast forwarding described message.
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