CN101127724A - Multicast system, device and method based on 802.1ah protocol in MAN Ethernet network - Google Patents
Multicast system, device and method based on 802.1ah protocol in MAN Ethernet network Download PDFInfo
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Abstract
The utility model discloses a router which is used for the multi cast message transmission in the local Ethernet based on the 802.1 ah protocol, wherein, the local Ethernet comprises at least two routers and an exchanger. Under the situation of normal network link, one of the routers, as an assigned router, is used to process and forward the multi cast current transmit by the core network to the exchanger; the other router, as an end-to-end assigned and back-up router, is used to detect the network link; when the fault of the network link is detected by the back-up router, the assigned router is used to process and forward the multi cast current transmit by the core network to the exchanger. The utility model also discloses the router application and 802.1 ah protocol-based implementation system and the method of multi cast in the local Ethernet. The utility model has the advantages of initiating the multi cast business practically, making sure the fast restoring of multi cast business and improving the reliability of network transmission.
Description
Technical field
The present invention relates to communication technical field, relate in particular in a kind of Metro Ethernet multi-cast system, equipment and method based on the 802.1ah agreement.
Background technology
Based on 802.1ah (MAC-in-MAC, double-deck MAC encapsulation) PBT (Provider BackboneTransport, the operator backbone transmission) technology is one of Metro Ethernet tranmission techniques that receives much concern recently, PBT has had quite perfect solution for unicast service, but for multicast service, for example BTV (Broadcast Television, radio and television) business but relates to seldom.
In the prior art, B-DA (Backbone Destination MAC, key purpose MAC) is though can use multicast mac address to support the multicast service of point-to-multipoint.But 3 points below the support multicast service must satisfy at least in Metro Ethernet: (1) basic service ability, support the message of basic point-to-multipoint to transmit; (2) high reliability must support 50ms with interior fault recovery; (3) can practical operation, commence business.But the B-DA scheme of above-mentioned use multicast has only been finished the point-to-multipoint message forwarding, can't realize the high reliability of Network Transmission.As shown in Figure 1, when switch (Switch) when A breaks down, the multicast service of all devices also will all interrupt under the switch A, and this Single Point of Faliure obviously is unacceptable in carrier network.
A kind of improved way of B-DA scheme to above-mentioned multicast be all equipment all is equipped with two up, as shown in Figure 2.All devices all be equipped with two up after, though eliminated Single Point of Faliure, discovering device fault and how to carry out topology switching fast and guarantee to be controlled at fault time 50ms and be not resolved yet how with problem such as interior.Therefore, the improvement project to this multicast B-DA still can't satisfy the condition of supporting multicast service in the Metro Ethernet.
Summary of the invention
The problem to be solved in the present invention provides in a kind of Metro Ethernet based on multi-cast system, equipment and the method for 802.1ah agreement, finishes the forwarding of Metro Ethernet mid point to the multicast message of multiple spot, satisfies the high reliability request of Network Transmission simultaneously.
For achieving the above object, the invention provides a kind of router, be used for realizing that Metro Ethernet transmits based on the multicast message of 802.1ah agreement, wherein comprise at least two routers and a switch in this Metro Ethernet,
Described router is under the network link normal condition, and one of them carries out the detection of network link as the multicast data flow of Designated Router processing forward core net transmission and to switch forwarding, another one as the BDR of opposite end Designated Router; When detecting network link as BDR and break down, be converted to multicast data flow that Designated Router processing forward core net sends and transmit to switch.
Wherein, described router comprises:
Routing unit is used at this equipment receiving the multicast data flow that core net sends during as Designated Router, and described multicast data flow is sent to router backbone edge exchange BEB unit; During as BDR, judge according to the message that the opposite end Designated Router sends whether network link breaks down at this equipment, when network link breaks down, receive the multicast data flow of core net transmission, and send to described BEB unit;
The BEB unit, its inside is provided with user network port CNP, make the BEB unit be connected with described routing unit by this CNP unit, the multicast message in the multicast data flow that the described routing unit that makes the BEB unit to receive sends is packaged into double-deck MAC encapsulation MAC-in-MAC frame format and is transmitted to described switch.
Wherein, described routing unit further comprises:
The monitoring subelement, during as Designated Router, the monitoring subelement is used for regularly sending connectivity check messages CCM message to the opposite end BDR at this equipment; During as BDR, receive the CCM message that the opposite end Designated Router sends at this equipment, in the time can't receiving described CCM message, be judged as network link and break down, and this equipment of triggering is converted to Designated Router by BDR.
The present invention also provides a kind of Metro Ethernet of using above-mentioned router based on 802.1ah protocol groups broadcast system, wherein comprises two above-mentioned routers and at least one switch in this system at least, comprising:
Wherein a router is used under the network link normal condition as Designated Router, and the multicast data flow that the processing forward core net sends is also transmitted to switch;
Another router is used for judging according to the message that described Designated Router sends whether network link breaks down as BDR; When network link breaks down, transmit as the multicast data flow of Designated Router processing forward core net transmission and to switch; And
At least one switch is used to receive the multicast data flow that described Designated Router sends, described multicast data flow sent downstream, and to the user terminal place port duplicated multicast message of its adding multicast group of being responsible for.
Wherein, described Designated Router, BDR and switch connect into a semi-loop, and described Designated Router and BDR lay respectively at two end points of described semi-ring.
Wherein, described switch further comprises:
Key core exchange BCB unit is used to receive the multicast data flow of described Designated Router or the transmission of described BDR, and respectively described multicast data flow is sent to downstream switch and switch b EB unit;
Switch b EB unit, inside is provided with carrier network port PNP port, make this switch b EB unit be connected by this PNP port with described BCB unit, the BEB unit is used to receive the multicast data flow that described BCB unit sends, according to the result of IGMP Snooping, determine request add multicast group the user terminal place port and to described port duplicated multicast message.
The present invention also provides in a kind of Metro Ethernet based on the method for realizing group broadcasting of 802.1ah agreement, and wherein this method is applied in the said system, may further comprise the steps:
Under the network link normal condition, BDR receives multicast data flow and the detect-message that Designated Router switch processes is downstream transmitted;
When described BDR detects network link and breaks down according to described detect-message;
BDR is converted to Designated Router processing forward multicast data flow.
Wherein, under the described network link normal condition, Designated Router switch processes forwarding multicasting stream downstream is specially:
Designated Router is packaged into the MAC-in-MAC frame format with the multicast message that receives, and switch downstream sends; Described MAC-in-MAC frame format is specially:
Key service identifier I-SID in the multicast message and two territories of key VLAN B-VLAN are freely distributed, and key target MAC (Media Access Control) address B-DA is taken as the multicast mac address with the I-SID correspondence.
Wherein, under the network link normal condition, when described BDR received the detect-message of described Designated Router transmission, the switch processes forwarding multicasting flowed downstream.
Wherein, the detect-message that described BDR receives is the connectivity check messages CCM message of timed sending, and described CCM message is encapsulated as the MAC-in-MAC frame format;
Described BDR detects network link and breaks down and be specially:
Described BDR is judged as network link when not receiving the CCM message of described Designated Router timed sending in the time of network settings and breaks down.
Compared with prior art, embodiments of the invention have the following advantages:
By embodiment provided by the invention, can the practicable multicast service of in Metro Ethernet, carrying out based on the 802.1ah agreement, and guarantee the fast quick-recovery of multicast service, improve the high reliability of Network Transmission.
Description of drawings
Fig. 1 is an available technology adopting multicast B-DA method schematic diagram;
Fig. 2 is a kind of improved multicast B-DA method schematic diagram in the prior art;
Fig. 3 is based on the multi-cast system figure of 802.1ah agreement in a kind of Metro Ethernet of the embodiment of the invention one;
Fig. 4 is based on the multi-cast system networking schematic diagram of 802.1ah agreement in a kind of Metro Ethernet of the embodiment of the invention one;
Fig. 5 is based on the flow chart of the method for multicasting of 802.1ah agreement in a kind of Metro Ethernet of the embodiment of the invention two;
Fig. 6 is that the multicast data flow when link is normal in the network in the embodiment of the invention two is transmitted schematic diagram;
Fig. 7 be in the embodiment of the invention two in the network multicast data flow during link failure transmit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
In the embodiments of the invention one, in a kind of Metro Ethernet based on the multi-cast system of 802.1ah agreement as shown in Figure 3, comprise: Designated Router (DR, Designated Router) 10, BDR (BDR, Backup Designated Router) 20 and at least one switch (Switch) 30.Need to prove that DR is identical router with BDR, is to specify router or BDR according to residing role in network just, carries out function corresponding.Under the situation of network failure, BDR BDR may change Designated Router DR into, and Designated Router DR also may change BDR BDR into, the function respective change that both carry out.
Concrete, Designated Router 10 is used under the network link normal condition, the multicast data flow that the processing forward core net sends.BDR 20 is used for when network link breaks down, as the multicast data flow of Designated Router processing forward core net transmission.Switch 30 is used to receive the multicast data flow that Designated Router 10 or BDR 20 send, and this multicast data flow is sent to downstream switch, and to its user port duplicated multicast message of being responsible for that joins multicast group.
Designated Router 10 further comprises routing unit 11 and BEB (Backbone Edge Bridge, backbone edge exchange) unit 12, and is concrete:
Wherein, routing unit 11 further comprises:
BDR 20 further comprises: route stand-by unit 21 and backup BEB unit 22, concrete:
Route stand-by unit 21 is used for judging according to the message that Designated Router 10 sends whether network link breaks down; When network link breaks down, receive the multicast data flow that core net sends, and send to backup BEB unit 22;
Wherein, route stand-by unit 21 further comprises:
Switch 30 further comprises:
BCB (Backbone Core Bridge, key core exchange) unit 31 is used to receive the multicast data flow that Designated Router 10 sends, and respectively this multicast data flow is sent to downstream switch and switch b EB unit 32.
Switch b EB unit 32, by inner PNP (Provider Network Port, the carrier network port) port is connected with BCB unit 31, be used to receive the multicast data flow that BCB unit 31 sends, result according to IGMPSnooping, determine the port at the user place of adding multicast group, and to these port duplicated multicast messages.
The network topology structure of this multi-cast system as shown in Figure 4, wherein Designated Router, BDR and each switch connect into a semi-ring physically, Designated Router and BDR are positioned at the two ends of semi-ring, whole network has constituted PBBN (Provider BackboneBridge Network, the operator backbone bridge joint network) network in the 802.1ah standard.
The system that provides by the foregoing description can practicable developing multicast business, and guarantees the fast quick-recovery of multicast service, improves the high reliability of Network Transmission.
The present invention also provides a kind of router, is used for realizing the method for multicasting of Metro Ethernet based on the 802.1ah agreement, and this router has the Designated Router of description in the foregoing description one and the function of BDR concurrently.Under the network link normal condition, the multicast data flow that sends as Designated Router processing forward core net is also transmitted or is carried out the detection of network link as the BDR of opposite end Designated Router to switch; When detecting network link as BDR and break down, the multicast data flow that sends as Designated Router processing forward core net is also transmitted to switch.
With the Designated Router of describing among the embodiment one and the structure similar of BDR, this router further comprises routing unit and BEB unit, wherein:
Routing unit, have in the foregoing description one routing unit 11 of specifying on the router one 0 and the function of the route stand-by unit 12 on the BDR 20 concurrently, be used at this equipment receiving the multicast data flow that core net sends, and sending to the BEB unit during as Designated Router; During as BDR, judge according to the message that the opposite end Designated Router sends whether network link breaks down at this equipment, when network link breaks down, receive the multicast data flow of core net transmission, and send to the BEB unit.
The BEB unit, have in the foregoing description one the BEB unit 21 of specifying on the router one 0 and the function of the backup BEB unit 22 on the BDR 20 concurrently, CNP port by inside is connected with routing unit, and the multicast message of the multicast data flow that the routing unit that is used for receiving sends is packaged into double-deck MAC encapsulation MAC-in-MAC frame format and is transmitted to switch.
Detailed description for this router and each Elementary Function of router please refer to the foregoing description one, is not repeated in this description at this.
In the embodiments of the invention two, based on the method for multicasting of 802.1ah agreement as shown in Figure 5, concrete steps are as follows in a kind of Metro Ethernet:
Step S501, under the normal situation of network link, DR receives the multicast data flow that core net sends.
Concrete, DR finishes the reception of the multicast data flow that core net is sent by multicast routing protocol (as PIM-SM).
This moment, BDR was in the state of being suppressed, and did not directly abandon after not receiving the multicast data flow that core net sends or receiving the multicast data flow that core net sends.
Step S502, DR adopt the service interface based on port that the multicast data flow that receives is encapsulated the MAC-in-MAC frame.
802.1ah define three kinds of service interfaces, based on port, based on vlan, based on ISID.In this step, all enter multicast services from the message that port enters, and carry out the Mac-in-Mac encapsulation.In the encapsulation process, the I-SID of multicast message (Backbone Service Instance Identifier, key service identifier) and B-VLAN (Backbone VLAN, key VLAN) two territories can freely be distributed by operator, B-DA (Backbone Destination MAC, key target MAC (Media Access Control) address) is taken as the multicast mac address with the I-SID correspondence.
The multicast data flow that step S503, DR encapsulate MAC-in-MAC sends to the switch in downstream, regularly sends the CCM detect-message of MAC-in-MAC encapsulation simultaneously to BDR.
The high reliability of network is based on this CFM (Connectivity Fault Management, Connectivity Fault Management) mechanism, DR continues to send CCM message to BDR every 10ms, and be encapsulated in MAC-in-MAC frame the same with multicast message of CCM message transmitted along semi-ring, up to being received by BDR.
Step S504, in network the static multicast MAC Address of the corresponding multicast message B-DA of configuration and B-VLAN on the BCB of all switches, outbound port comprises all PNP ports (having three ports, two outside PNP ports and an inner PNP port).
Multicast data flow will be forwarded to BDR along whole semi-ring.BEB unit operation IGMP Snooping in the switch determines the CNP port that needs duplicated multicast to flow simultaneously.
Step S505, BDR check according to multicast RPF (Reverse Path Forwarding, inspection of reversal path) and abandon the multicast message that receives or directly be in the state of being suppressed, do not receive any multicast message.
Fig. 6 is under the normal situation of network link, the forwarding schematic diagram of multicast data flow.
Step S506, BDR detect network link and break down.
Concrete, interrupt at network link, DR breaks down or network in a certain switch when breaking down, BDR will can't receive the CCM detect-message that DR sends in the time of network settings.
Step S507, BDR are converted to the multicast data flow that DR receives core net, to guarantee the fast quick-recovery of multicast service.
BDR continues monitoring CCM message.In case the link down in the generation semi-ring, switch or DR crash, BDR will not receive CCM message, and at this time BDR is upgraded to DR, and beginning is injected multicast message to semi-ring, guarantee that multicast service recovers in 50ms.
Fig. 7 is that multicast data flow is transmitted schematic diagram after in the network link failure taking place, and wherein this link failure is specially the link down in the semi-ring.After the link repair of interrupting, former BDR can still carry out the forwarding of core net multicast data flow as DR, and correspondingly, former DR is converted to the detection that BDR carries out network link failure.Or former BDR is returned to the original state as BDR, carries out the forwarding of core net multicast data flow and former DR still is returned to original DR state, specifically by which platform router device can be set according to the needs of network as DR.Processing method when breaking down for the switch in the semi-ring is identical with the processing method of this link down.
The link failure that causes when breaking down for DR is converted to the forwarding that new DR carries out the core net multicast data flow by BDR.When former DR after fault recovery, carry out the detection of network link failure as new BDR, and the former BDR that has been converted to new DR can keep always the function of DR to carry out the forwarding of core net multicast data flow.
The method that provides by the foregoing description can practicable developing multicast business, and guarantees the fast quick-recovery of multicast service, improves the high reliability of Network Transmission.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this obtains the machine software product and is stored in the storage medium, comprises that some instructions are used so that a network equipment is carried out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. a router is used for realizing that Metro Ethernet transmits based on the multicast message of 802.1ah agreement, wherein comprises at least two routers and a switch in this Metro Ethernet, it is characterized in that,
Described router is under the network link normal condition, and one of them carries out the detection of network link as the multicast data flow of Designated Router processing forward core net transmission and to switch forwarding, another one as the BDR of opposite end Designated Router; When detecting network link as BDR and break down, be converted to multicast data flow that Designated Router processing forward core net sends and transmit to switch.
2. router according to claim 1 is characterized in that described router comprises:
Routing unit is used at this equipment receiving the multicast data flow that core net sends during as Designated Router, and described multicast data flow is sent to router backbone edge exchange BEB unit; During as BDR, judge according to the message that the opposite end Designated Router sends whether network link breaks down at this equipment, when network link breaks down, receive the multicast data flow of core net transmission, and send to described BEB unit;
The BEB unit, its inside is provided with user network port CNP, make the BEB unit be connected with described routing unit by this CNP unit, the multicast message in the multicast data flow that the described routing unit that makes the BEB unit to receive sends is packaged into double-deck MAC encapsulation MAC-in-MAC frame format and is transmitted to described switch.
3. as router as described in the claim 2, it is characterized in that described routing unit further comprises:
The monitoring subelement, during as Designated Router, the monitoring subelement is used for regularly sending connectivity check messages CCM message to the opposite end BDR at this equipment; During as BDR, receive the CCM message that the opposite end Designated Router sends at this equipment, in the time can't receiving described CCM message, be judged as network link and break down, and this equipment of triggering is converted to Designated Router by BDR.
4. a Metro Ethernet of using above-mentioned router wherein comprises two above-mentioned routers and at least one switch at least based on 802.1ah protocol groups broadcast system in this system, it is characterized in that, comprising:
Wherein a router is used under the network link normal condition as Designated Router, and the multicast data flow that the processing forward core net sends is also transmitted to switch;
Another router is used for judging according to the message that described Designated Router sends whether network link breaks down as BDR; When network link breaks down, transmit as the multicast data flow of Designated Router processing forward core net transmission and to switch; And
At least one switch is used to receive the multicast data flow that described Designated Router sends, described multicast data flow sent downstream, and to the user terminal place port duplicated multicast message of its adding multicast group of being responsible for.
5. multi-cast system as claimed in claim 4 is characterized in that described Designated Router, BDR and switch connect into a semi-loop, and described Designated Router and BDR lay respectively at two end points of described semi-ring.
6. as claim 4 or 5 described multi-cast systems, it is characterized in that described switch further comprises:
Key core exchange BCB unit is used to receive the multicast data flow of described Designated Router or the transmission of described BDR, and respectively described multicast data flow is sent to downstream switch and switch b EB unit;
Switch b EB unit, inside is provided with carrier network port PNP port, make this switch b EB unit be connected by this PNP port with described BCB unit, the BEB unit is used to receive the multicast data flow that described BCB unit sends, according to the result of IGMP Snooping, determine request add multicast group the user terminal place port and to described port duplicated multicast message.
In the Metro Ethernet based on the method for realizing group broadcasting of 802.1ah agreement, wherein this method is applied in the system as claimed in claim 4, it is characterized in that, may further comprise the steps:
Under the network link normal condition, BDR receives multicast data flow and the detect-message that Designated Router switch processes is downstream transmitted;
When described BDR detects network link and breaks down according to described detect-message;
BDR is converted to Designated Router processing forward multicast data flow.
8. method of realizing group broadcasting as claimed in claim 7 is characterized in that, under the described network link normal condition, Designated Router switch processes forwarding multicasting stream downstream is specially:
Designated Router is packaged into the MAC-in-MAC frame format with the multicast message that receives, and switch downstream sends; Described MAC-in-MAC frame format is specially:
Key service identifier I-SID in the multicast message and two territories of key VLAN B-VLAN are freely distributed, and key target MAC (Media Access Control) address B-DA is taken as the multicast mac address with the I-SID correspondence.
As in the Metro Ethernet as described in claim 7 or 8 based on the method for realizing group broadcasting of 802.1ah agreement, it is characterized in that, under the network link normal condition, when described BDR received the detect-message of described Designated Router transmission, the switch processes forwarding multicasting flowed downstream.
As in the Metro Ethernet as described in the claim 9 based on the method for realizing group broadcasting of 802.1ah agreement, it is characterized in that, the detect-message that described BDR receives is the connectivity check messages CCM message of timed sending, and described CCM message is encapsulated as the MAC-in-MAC frame format;
Described BDR detects network link and breaks down and be specially:
Described BDR is judged as network link when not receiving the CCM message of described Designated Router timed sending in the time of network settings and breaks down.
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| US11576011B2 (en) | 2017-09-04 | 2023-02-07 | Nanjing Zte New Software Co., Ltd. | Multicast traffic transmission method, related device and computer-readable storage medium |
| CN107948061A (en) * | 2017-11-23 | 2018-04-20 | 成都智蜂网科技有限责任公司 | Hot standby the double route system and its control method that can be shunted based on bridge joint |
| CN107948061B (en) * | 2017-11-23 | 2021-11-12 | 成都智蜂网科技有限责任公司 | Bridge-based distributable hot standby dual-routing system and control method thereof |
| CN108519940A (en) * | 2018-04-12 | 2018-09-11 | 郑州云海信息技术有限公司 | A kind of storage device alarm method, system and computer readable storage medium |
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