CN101127724B - 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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- CN101127724B CN101127724B CN200710163512XA CN200710163512A CN101127724B CN 101127724 B CN101127724 B CN 101127724B CN 200710163512X A CN200710163512X A CN 200710163512XA CN 200710163512 A CN200710163512 A CN 200710163512A CN 101127724 B CN101127724 B CN 101127724B
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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, operator backbone transmission) technology is one of Metro Ethernet tranmission techniques that receives much concern recently, and 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 accomplished 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 that the present invention will solve provides in a kind of Metro Ethernet multi-cast system, equipment and the method based on the 802.1ah agreement, accomplishes 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 present invention provides a kind of 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,
Said 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, convert multicast data flow that Designated Router processing forward core net sends into and transmit to switch; After network link failure was repaired, the BDR before the network link failure was still as Designated Router, and the Designated Router before the network link failure converts BDR into; Perhaps, the BDR before the network link failure is returned to BDR, and the Designated Router before the network link failure is still as Designated Router;
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring.
Wherein, said router comprises:
Routing unit is used at this equipment receiving the multicast data flow that core net is sent during as Designated Router, and said multicast data flow is sent to router backbone edge exchange BEB unit; During as BDR, whether the message determining network link that sends according to the opposite end Designated Router breaks down at this equipment, when network link breaks down, receives the multicast data flow that core net is sent, and sends to said BEB unit;
The BEB unit; Its inside is provided with user network port CNP; Make the BEB unit be connected with said routing unit through this CNP unit, the multicast message in the multicast data flow that the said 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 said switch.
Wherein, said 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 said CCM message, be judged as network link and break down, and this equipment of triggering converts Designated Router into by BDR.
The present invention also provides a kind of Metro Ethernet based on 802.1ah protocol groups broadcast system, wherein comprises at least in this system comprising two routers and at least one switch:
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 is sent is also transmitted to switch; And, after network link failure is repaired, convert BDR into, or still as Designated Router;
Whether another router is used for breaking down according to the message determining network link that said Designated Router sends 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; After network link failure was repaired, the Designated Router before network link failure converted under the situation of BDR, still as Designated Router; Designated Router before network link failure still under the situation as Designated Router, is returned to BDR; And
At least one switch is used to receive the multicast data flow that said Designated Router sends, said multicast data flow sent downstream, and to the user terminal place of its adding multicast group of being responsible for port duplicated multicast message;
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring.
Wherein, said switch further comprises:
Key core exchange BCB unit is used to receive the multicast data flow of said Designated Router or the transmission of said BDR, and respectively said multicast data flow is sent to downstream switch and switch backbone edge exchange BEB unit;
Switch b EB unit; Inside is provided with carrier network port PNP port; Make this switch b EB unit be connected through this PNP port with said BCB unit; The BEB unit is used to receive the multicast data flow that said BCB unit sends, according to the result of IGMP Snooping, confirm request add multicast group the user terminal place port and to said 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 said BDR detected network link and breaks down according to said detect-message, BDR converted Designated Router processing forward multicast data flow into;
After network link failure was repaired, the BDR before the network link failure was still as Designated Router, and the Designated Router before the network link failure converts BDR into; Perhaps, the BDR before the network link failure is returned to BDR, and the Designated Router before the network link failure is still as Designated Router;
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring.
Wherein, under the said 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; Said 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 corresponding with I-SID.
Wherein, under the network link normal condition, when said BDR received the detect-message of said Designated Router transmission, the switch processes forwarding multicasting flowed downstream.
Wherein, the detect-message that said BDR receives is the connectivity check messages CCM message of timed sending, and said CCM message is encapsulated as the MAC-in-MAC frame format;
Said BDR detects network link and breaks down and be specially:
Said BDR is judged as network link when in the time of network settings, not receiving the CCM message of said Designated Router timed sending and breaks down.
Compared with prior art, embodiments of the invention have the following advantages:
Through 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 sketch map;
Fig. 2 is a kind of improved multicast B-DA method sketch map 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 sketch map 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 sketch map;
Fig. 7 be in the embodiment of the invention two in the network multicast data flow during link failure transmit sketch map.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail:
In the embodiments of the invention one; As shown in Figure 3 in a kind of Metro Ethernet based on the multi-cast system of 802.1ah agreement; 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 possibly change Designated Router DR into, and Designated Router DR also possibly 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 is sent.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:
Whether route stand-by unit 21 is used for breaking down according to the message determining network link that Designated Router 10 sends; When network link breaks down, receive the multicast data flow that core net is sent, 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; Through inner PNP (Provider Network Port; The carrier network port) port is connected with BCB unit 31, is used to receive the multicast data flow that BCB unit 31 sends, according to the result of IGMPSnooping; Confirm 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 is 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 through the foregoing description, can practicable developing multicast professional, and guarantee the fast quick-recovery of multicast service, improve 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, carry out the detection of network link as the multicast data flow of Designated Router processing forward core net transmission and to the switch forwarding or as the BDR of opposite end Designated Router; When detecting network link as BDR and break down, the multicast data flow of sending 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 is sent, and sending to the BEB unit during as Designated Router; During as BDR, whether the message determining network link that sends according to the opposite end Designated Router breaks down at this equipment, when network link breaks down, receives the multicast data flow that core net is sent, and sends 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 through inside is connected with routing unit, and the multicast message of the multicast data flow that is used for the routing unit that receives is sent 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, as shown in Figure 5 based on the method for multicasting of 802.1ah agreement in a kind of Metro Ethernet, concrete steps are following:
Step S501, under the normal situation of network link, DR receives the multicast data flow that core net is sent.
Concrete, DR accomplishes the reception of the multicast data flow that core net is sent through multicast routing protocol (like 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 get into multicast services from the message that port gets into, 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, and B-DA (Backbone Destination MAC, key target MAC (Media Access Control) address) is taken as the multicast mac address corresponding with I-SID.
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 is every to be continued to send CCM message to BDR at a distance from 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 confirms the CNP port that needs duplicated multicast to flow simultaneously.
Inspection abandons the multicast message that receives or directly is in the state of being suppressed according to multicast RPF (Reverse Path Forwarding, inspection of reversal path) for step S505, BDR, does not receive any multicast message.
Fig. 6 is under the normal situation of network link, the forwarding sketch map 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 convert the multicast data flow that DR receives core net into, 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, begin to inject multicast message to semi-ring, guarantee that multicast service recovers in 50ms.
Fig. 7 is that multicast data flow is transmitted sketch map 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 converts the detection that BDR carries out network link failure into.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 converts the forwarding that new DR carries out the core net multicast data flow into 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 converted new DR into can keep always the function of DR to carry out the forwarding of core net multicast data flow.
The method that provides through the foregoing description, can practicable developing multicast professional, and guarantee the fast quick-recovery of multicast service, improve the high reliability of Network Transmission.
Through the description of above execution mode, 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 be come out with the embodied 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 disclosedly be merely 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 (8)
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,
Said 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, convert multicast data flow that Designated Router processing forward core net sends into and transmit to switch; After network link failure was repaired, the BDR before the network link failure was still as Designated Router, and the Designated Router before the network link failure converts BDR into; Perhaps, the BDR before the network link failure is returned to BDR, and the Designated Router before the network link failure is still as Designated Router;
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring;
Wherein, said router specifically comprises:
Routing unit is used at this equipment receiving the multicast data flow that core net is sent during as Designated Router, and said multicast data flow is sent to router backbone edge exchange BEB unit; During as BDR, whether the message determining network link that sends according to the opposite end Designated Router breaks down at this equipment, when network link breaks down, receives the multicast data flow that core net is sent, and sends to said BEB unit;
The BEB unit; Its inside is provided with user network port CNP; Make the BEB unit be connected with said routing unit through this CNP unit, the multicast message in the multicast data flow that the said 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 said switch.
2. router according to claim 1 is characterized in that said 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 said CCM message, be judged as network link and break down, and this equipment of triggering converts Designated Router into by BDR.
3. a Metro Ethernet wherein comprises two 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 is sent is also transmitted to switch; And, after network link failure is repaired, convert BDR into, or still as Designated Router;
Whether another router is used for breaking down according to the message determining network link that said Designated Router sends 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; After network link failure was repaired, the Designated Router before network link failure converted under the situation of BDR, still as Designated Router; Designated Router before network link failure still under the situation as Designated Router, is returned to BDR; And
At least one switch is used to receive the multicast data flow that said Designated Router sends, said multicast data flow sent downstream, and to the user terminal place of its adding multicast group of being responsible for port duplicated multicast message,
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring.
4. multi-cast system as claimed in claim 3 is characterized in that, said switch further comprises:
Key core exchange BCB unit is used to receive the multicast data flow of said Designated Router or the transmission of said BDR, and respectively said multicast data flow is sent to downstream switch and switch backbone edge exchange BEB unit;
Switch b EB unit; Inside is provided with carrier network port PNP port; Make this switch b EB unit be connected through this PNP port with said BCB unit; The BEB unit is used to receive the multicast data flow that said BCB unit sends, according to the result of IGMP Snooping, confirm request add multicast group the user terminal place port and to said 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 3, 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 said BDR detected network link and breaks down according to said detect-message, BDR converted Designated Router processing forward multicast data flow into;
After network link failure was repaired, the BDR before the network link failure was still as Designated Router, and the Designated Router before the network link failure converts BDR into; Perhaps, the BDR before the network link failure is returned to BDR, and the Designated Router before the network link failure is still as Designated Router;
Said Designated Router, BDR and switch connect into a semi-loop, and said Designated Router and BDR lay respectively at two end points of said semi-ring.
6. method of realizing group broadcasting as claimed in claim 5 is characterized in that, under the said 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; Said 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 corresponding with I-SID.
As in claim 5 or the 6 said Metro Ethernets based on the method for realizing group broadcasting of 802.1ah agreement; It is characterized in that; Under the network link normal condition, when said BDR received the detect-message of said Designated Router transmission, the switch processes forwarding multicasting flowed downstream.
As in the said Metro Ethernet of claim 7 based on the method for realizing group broadcasting of 802.1ah agreement; It is characterized in that; The detect-message that said BDR receives is the connectivity check messages CCM message of timed sending, and said CCM message is encapsulated as the MAC-in-MAC frame format;
Said BDR detects network link and breaks down and be specially:
Said BDR is judged as network link when in the time of network settings, not receiving the CCM message of said Designated Router timed sending and breaks down.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101521614B (en) * | 2008-02-26 | 2012-04-04 | 华为技术有限公司 | Method, device and system for protecting operator backbone transmission service |
| CN101610200B (en) * | 2008-06-19 | 2012-04-04 | 华为技术有限公司 | Switching method and device of multicast routing |
| CN101577679B (en) * | 2009-06-26 | 2011-08-03 | 杭州华三通信技术有限公司 | Configuration management method for realizing multicast service sharing among appointed routers and appliance thereof |
| CN101827025A (en) * | 2010-04-02 | 2010-09-08 | 华为技术有限公司 | Communication network multicast protection method, system and device |
| CN102377584A (en) * | 2010-08-12 | 2012-03-14 | 盛科网络（苏州）有限公司 | Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode) |
| CN101895481B (en) * | 2010-08-31 | 2013-01-09 | 迈普通信技术股份有限公司 | Bridging method for supporting second-layer multicast forwarding and router thereof |
| CN102325053B (en) * | 2011-09-22 | 2019-04-23 | 中兴通讯股份有限公司 | The control method and device of physical signal during router network access |
| CN102611566B (en) * | 2011-12-16 | 2015-01-21 | 华为技术有限公司 | Method and device for recovering customer service |
| US9762403B2 (en) * | 2014-11-21 | 2017-09-12 | Avaya Inc. | Shortest path bridging (SPB)—protocol-independent multicast (PIM) interactions on a backbone edge bridge (BEB) acting as a multicast boundary router interfacing with a PIM network |
| CN109428814B (en) | 2017-09-04 | 2022-12-02 | 中兴通讯股份有限公司 | Multicast traffic transmission method, related equipment and computer readable storage medium |
| 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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| CN1838635A (en) * | 2005-03-25 | 2006-09-27 | 杭州华为三康技术有限公司 | Dualhoming network holding method based on RPR network |
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