CN101009628A - Update method and device for multicast list in the change of switching network topology - Google Patents
Update method and device for multicast list in the change of switching network topology Download PDFInfo
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Abstract
The disclosed update method for multicast item when SN topology varying comprises: when detecting the SN topology varying or receiving topology-variation message, the root bridge switch sends configuration message to every transmission bridge switch; then, the said transmission bridge switch re-sets port role and sends register message with multicast information to the superior switch; finally, every switch in SN updates self multicast item. This invention is fast and has no effect to user.
Description
Technical field
The present invention relates to network communications technology field, multicast list method for updating and device when especially relating to a kind of switching network topology and changing.
Background technology
IGMP (Intemet Group Management Protocol, IGMP) run on main frame and with the network equipment that main frame directly links to each other between, be that the IP main frame is used for reporting the multi-address broadcast group membership agreement of identity.By the IGMP agreement, can wish to add and receive the information of certain particular multicast group on the one hand by IGMP protocol host notice local network device; On the other hand, whether the network equipment member that periodically inquires about certain known group in the local area network (LAN) by the IGMP agreement is in active state.The main effect of IGMP agreement is the problem that solves occupied bandwidth when broadcasting on the network.In network, when sending broadcast message for all clients, the exchange opportunity of supporting IGMP with broadcast message without issuing all clients with filtering, but these information only need be transferred to the client of some parts by multicast mode.
IGMP Snooping (snoop protocol) is the same with the IGMP agreement, all be used for the management and the control of multicast group, but the IGMP agreement operates in network layer, and IGMP Snooping operates in link layer.When layer 2 ethernet switch is received the IGMP message that transmits between main frame and the router, IGMP Snooping analyze the IGMP message with information, set up and safeguard MAC (Mediums AccessControl at two layers, the medium access control) multicast address is just transmitted according to the MAC multicast address from the multicast message that router issues later on.IGMP Snooping can initiatively send Query message (query message) to port in the ageing time timer expiry of the IGMP leave message of receiving a certain port or a certain port.
As the MSTP of switching network (Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol) during link change, the topological structure of this switching network also changes thereupon, the path that the former cause IGMPSnooping of multicast learns may be blocked, need this moment router to send the Query message, after user terminal is received the Query message, can return report message (report message), thereby regenerate multicast forwarding path.It is long that but router sends the cycle of Query message, it generally is two minutes, and the recovery process of multicast list itself is consuming time also very long in this mode, therefore when the MSTP of switching network link change, even the link of MSTP can switch fast, multicast data flow also can be interrupted more than two minutes, so the topological structure of switching network can be restrained fast, but multicast list can't upgrade fast, can cause flux of multicast long break period.
Summary of the invention
Multicast list method for updating and device when the topological structure of switching network changes, can upgrade multicast list fast when the problem to be solved in the present invention provided a kind of switching network topology and changes.
For achieving the above object, multicast list method for updating when the invention provides a kind of switching network topology and changing, may further comprise the steps: the topological structure that root bridge switch detects switching network changes or when receiving topology changed messages, sends configuration message and respectively transmits the bridge switch in the network; The described bridge switch that respectively transmits is reset port role, and the logon message of multicast group information is carried in switch transmission upstream; Each switch in the described switching network upgrades multicast list separately after reseting port.
According to one aspect of the present invention, before described bridge switch sends configuration message, also comprise: transmission bridge switch detects the topological structure of switching network, and the transmission bridge switch that is changed by structure when topological structure changes sends topology changed messages to described bridge switch.
According to another aspect of the present invention, also comprise: it is invalid that the multicast list separately of the switch after receiving described topology changed messages in the switching network is set to, and prevents that former multicast service from interrupting.
According to another aspect of the present invention, described transmission bridge switch detects the process whether the switching network topology structure change and is specially: whether described bridge switch and/or transmission bridge switch detect the link that is connected with other switches and change, if change, represent that then the switching network topology structure changes.
According to another aspect of the present invention, described process to root bridge switch transmission topology changed messages specifically comprises: the transmission bridge switch that changes when described structure does not directly link to each other with root bridge switch, then described transmission bridge switch sends topology changed messages along network topology to root bridge switch by the forwarding of adjacent transmission bridge switch; The transmission bridge switch that changes when described structure directly links to each other with root bridge switch, and then described transmission bridge switch directly sends topology changed messages to root bridge switch.
According to another aspect of the present invention, the described port role of resetting is specially: the inspection of described transmission bridge switch receives the port of described configuration message, and described port is set to root port.
According to another aspect of the present invention, the detailed process of described renewal multicast list comprises: described transmission bridge switch upgrades local multicast list according to multicast group under the logon message that receives, the connected user and the port role of self resetting; The inspection of described bridge switch receives the port of described logon message, and upgrades local multicast list according to the multicast group information that described port and described logon message carry.
According to another aspect of the present invention, described bridge switch also comprises after upgrading local multicast list: if the port of described bridge switch is not received the logon message that carries relevant multicast group information within a certain period of time, and corresponding multicast list on the then aging described port.
The invention provides a kind of root bridge switch of switching network, comprising: topology detection unit, message process unit, configuration message generation unit and multicast management unit; Described topology detection unit determines by detecting the link that is connected with local port whether the switching network topology structure changes; Described message process unit receives the type that message is also judged the message that receives, if the message that receives carries multicast group information, then triggers the multicast management unit and carries out respective handling; When the message that topological structure changes or described message process unit receives that detects switching network when described topology detection unit was topology changed messages, described configuration message generation unit generated and sent configuration message; Described multicast management unit, the multicast group information that the message that receives according to described message process unit carries is upgraded local multicast list.
According to another aspect of the present invention, when the message that receives is logon message, described message process unit sends to described multicast management unit with multicast group information in the described logon message and the port information that receives described logon message, upgrades local multicast list.
The invention provides a kind of transmission bridge switch of switching network, comprising: message process unit, port role are provided with unit and multicast management unit; Described message process unit receives the type that message is also judged the message that receives, if the message that receives carries multicast group information, then triggers the multicast management unit and carries out respective handling; When the message that receives when described message process unit was configuration message, described port role was provided with the unit according to the port that receives described configuration message, and port role is set; Described multicast management unit, multicast group information that the message that receives according to described message process unit carries and described port role are provided with the port role that the unit is provided with, and upgrade local multicast list.
According to another aspect of the present invention, also comprise topology detection unit and topology changed messages generation unit; Described topology detection unit determines by detecting the link that is connected with local port whether the switching network topology structure changes; When described topology detection unit detected the switching network topology structure and changes, described topology changed messages generation unit generated and sent topology changed messages.
According to another aspect of the present invention, also comprise the logon message generation unit, according to the multicast group information of obtaining from described multicast management unit, generate also switch transmission upstream and carry the logon message of multicast group information.
According to another aspect of the present invention, when the message that receives was topology changed messages, described message process unit was controlled described multicast management unit, and it is invalid making it that multicast list is set; When the message that receives was configuration message, described message process unit was controlled described port role the setting that the unit carries out port role is set; When the message that receives was logon message, described message process unit sent to described multicast management unit with multicast group information in the described logon message and the port information that receives described logon message, upgrades local multicast list.
Compared with prior art, the present invention has the following advantages:
The present invention detects by the variation of transmission bridge switch to switching network topology, and in time report testing result, switch in the network carries out respective handling according to testing result, thereby upgrade multicast list in the time of can changing at the topological structure of switching network fast, can not make flux of multicast long break period.
And the present invention need not client participate in when upgrading multicast list, can not influence the user.
Description of drawings
Fig. 1 is the structure chart of the transmission bridge switch of a kind of switching network of the present invention;
Fig. 2 is the method for reporting flow chart that a kind of switching network topology of the present invention changes;
Fig. 3 is a kind of method flow diagram that the bridge switch upgrades the local multicast list item that transmits of the present invention;
Fig. 4 is the structure chart of the root bridge switch of a kind of switching network of the present invention;
Fig. 5 is the method flow diagram that a kind of bridge switch of the present invention upgrades the local multicast list item;
Fig. 6 is a kind of structure chart of switching network;
Fig. 7 is a kind of multicast list method for updating flow chart of embodiments of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
The structure of the transmission bridge switch of a kind of switching network of the present invention comprises that topology detection unit 11, topology changed messages generation unit 12, message process unit 13, port role are provided with unit 14, multicast management unit 15 and logon message generation unit 16 as shown in Figure 1.Wherein topology detection unit 11 is connected with topology changed messages generation unit 12; Message process unit 13 is provided with unit 14 with port role and is connected; Multicast management unit 15 is provided with unit 14 with message process unit 13, port role respectively and is connected with logon message generation unit 16.
Step s201, topology detection unit 11 judges whether switching network topology changes, if change, then changes step s202, otherwise finishes.
Step s202, topology changed messages generation unit 12 generates topology changed messages.
Step s203, topology changed messages generation unit 12 send the root bridge switch of described topology changed messages in the switching network.Its process that sends topology changed messages is specially: when described transmission bridge switch does not directly link to each other with root bridge switch, then described transmission bridge switch sends topology changed messages along network topology to root bridge switch by the forwarding of adjacent transmission bridge switch; When described transmission bridge switch directly links to each other with root bridge switch, then described transmission bridge switch directly sends topology changed messages to root bridge switch.
Step s301, message process unit 13 receives message.
Step s302, message process unit 13 is judged the type of described message, if described message is a topology changed messages, then changes step s303; If described message is a configuration message, then change step s304; If described message is a logon message, then change step s305.
Step s303, it is invalid that multicast management unit 15 is provided with multicast list, and flux of multicast is broadcasted in described switching network.
Step s304, port role are provided with unit 14 and according to the port that receives configuration message port role are set.
Step s305, the multicast group information of carrying according to the logon message that receives, the multicast group under the connected user and be provided with after port role, multicast management unit 15 upgrades local multicast list.
Step s306, logon message generation unit 16 generates logon message, comprises multicast group information in the described logon message.
Step s307, logon message generation unit 16 upstream switch send described logon message.
The structure of the root bridge switch of a kind of switching network of the present invention as shown in Figure 4, comprise: multicast management unit 41, message process unit 42, configuration message generation unit 43 and topology detection unit 44, wherein message process unit 42 is connected with configuration message generation unit 43 with multicast management unit 41 respectively, and topology detection unit 44 is connected with configuration message generation unit 43.
Message process unit 42 receives message and judges the type of the message that receives; When the message that receives was topology changed messages, message process unit 42 triggered configuration message generation unit 43 and generates configuration message; When the message that receives is logon message, if described message carries multicast group information, then described multicast group information and the port information that receives described logon message are sent to multicast management unit 41, trigger multicast management unit 41 and carry out respective handling, upgrade local multicast list.Topology detection unit 44 determines by detecting the link that is connected with local port whether the switching network topology structure changes, and wherein, link is normally represented the network topology structure no change, and link represents that unusually network topology structure changes; If network topology structure changes, then trigger configuration message generation unit 43 and generate configuration message; If do not change, then configuration message generation unit 43 is not triggered.
When the structure of the root bridge switch that adopts switching network shown in Figure 4, the method that a kind of bridge switch of the present invention upgrades the local multicast list item may further comprise the steps as shown in Figure 5:
Step s501, message process unit 42 receives message.
Step s502, message process unit 42 is judged the type of described message, if described message is a topology changed messages, then changes step s503; If described message is a logon message, then change step s505.
Step s503, configuration message generation unit 43 generates configuration message.
Step s504, configuration message generation unit 43 send the switch of described configuration message to the described switching network.
Step s505 obtains multicast group information and the port information that receives described logon message in the logon message.Be that message process unit 42 sends to multicast management unit 41 with multicast group information in the described logon message and the port information that receives described logon message.
Step s506, multicast management unit 41 upgrades local multicast list according to multicast group information in the described logon message and the port information that receives described logon message.
In addition, change, also trigger configuration message generation unit 43, carry out the operation of step s503 and step s504 if topology detection unit 44 detects the topological structure of switching network.
A kind of structure of switching network as shown in Figure 6, comprise root bridge switch 61 and transmission bridge switch 62, switch 63, switch 64 and switch 65, switch 61 is connected with the port a of switch 62 by port a, switch 62 is connected with the port a of switch 63 by port b, switch 63 is connected with the port a of switch 64 by port b, switch 64 is connected with the port a of switch 65 by port b, and switch 65 is connected with the port b of switch 61 by port b.The port a of switch 65 is a port blocked, makes loop free in the switching network; If occur loop in the switching network, can cause Frame massive duplication in the network segment, cause network performance to descend, even cause network paralysis.Each transmits the bridge switch and also comprises port c, is connected respectively on the user terminal of corresponding multicast group.
Switch 61 periodically sends the hierarchical structure that configuration message is kept switching network, and respective switch upper port role is as shown in table 1:
Table 1
| Switch | Root port | Designated |
| 61 | Do not have | a b |
| 62 | a | b |
| 63 | a | b |
| 64 | a | b |
| 65 | b | a |
The user that multicast group A and multicast group B are arranged on the switch 62; The user that multicast group B and multicast group C are arranged on the switch 63; The user that multicast group C is arranged on the switch 64; The user that multicast group A is arranged on the switch 65.By user and the mutual IGMP agreement of router, enable IGMPsnooping on the switch, the multicast MAC situation on the switch 61 is as shown in table 2, and this moment, flux of multicast was normal.
Table 2
| Multicast mac address | Outbound port |
| Multicast group A | a，b |
| Multicast group B | a |
| Multicast group C | a |
When the link between switch 62 and 63 broke down, the topological structure of this switching network also changed thereupon.Hypothesis switch 61 adopts the structure of root bridge switch shown in Figure 4 in the present embodiment, switch 62, switch 63, switch 64 and switch 65 adopt the structure of transmission bridge switch shown in Figure 1, a kind of multicast list method for updating of the present invention may further comprise the steps as shown in Figure 7 at this moment:
Step s701, the topology detection unit 11 of switch 63 judges whether switching network topology changes, if change, then changes step s702, otherwise finishes.Its deterministic process is specially: whether topology detection unit 11 detects the link that is connected with a port or the b port of switch 63 and changes, if change, represents that then variation has taken place switching network topology.The link that is connected with the port a of switch 63 in the present embodiment breaks down, so variation has taken place switching network topology, changes step s702.
Step s702, the topology changed messages generation unit 12 of switch 63 generates topology changed messages.
Step s703, the topology changed messages generation unit 12 of switch 63 sends described topology changed messages to switch 61 from port b, carries out step s704 and step s711 then.The process that sends topology changed messages is specially: because switch 63 does not directly link to each other with switch 61, so switch 63 by the forwarding of switch 64 and switch 65, sends topology changed messages along network topology to switch 61.
Step s704, the message process unit 13 of switch 64 receives message.
Step s705, the message process unit 13 of switch 64 is judged the type of described message, if described message is a topology changed messages, then changes step s706; If described message is a configuration message, then change step s707; If described message is a logon message, then change step s708.
Step s706, it is invalid that the multicast management unit 15 of switch 64 is provided with multicast list, and flux of multicast is broadcasted in described switching network, to prevent the interruption of former multicast service.
Step s707, the port role of switch 64 are provided with unit 14 and according to the port that receives configuration message port role are set.Its setting up procedure is specially: switch 64 is checked the port that receives described configuration message, and described port is set to root port.
Step s708, the multicast group under the multicast group information that the multicast management unit 15 of switch 64 carries according to the logon message that receives, the user who is connected with switch 64 and be provided with after port role, the multicast list of renewal this locality.Multicast list after the renewal is as shown in table 3:
Table 3
| Multicast mac address | Outbound port |
| GROUPA | Do not have |
| GROUPB | a |
| GROUPC | a，c |
Step s709, the logon message generation unit 16 of switch 64 generates logon message, carries multicast group information in the described logon message.
Step s710, the logon message generation unit 16 of switch 64 sends described logon message to root bridge switch.
In step s704 to s710, all the other transmission bridge switches carry out and switch 64 identical operations.
Step s711, the message process unit 42 of switch 61 receives message.
Step s712, the message process unit 42 of switch 61 is judged the type of described message, if described message is a topology changed messages, then changes step s713; If described message is a logon message, then change step s715.
Step s713, the configuration message generation unit 43 of switch 61 generates configuration message.
Step s714, the configuration message generation unit 43 of switch 61 send the switch of described configuration message to the described switching network, and change step s704.
Step s715 obtains multicast group information and the port information that receives described logon message in the logon message.It is the multicast management unit 41 that the message process unit 42 of switch 61 sends to multicast group information in the described logon message and the port information that receives described logon message switch 61.
Step s716, the multicast management unit 41 of switch 61 upgrades local multicast list according to multicast group information of carrying in the described logon message and the port that receives described logon message.Multicast list after the renewal is as shown in table 4:
Table 4
| Multicast mac address | Outbound port |
| GROUPA | a，b |
| GROUPB | a，b |
| GROUPC | a，b |
Step s717, if the port of switch 61 is not received the logon message that comprises relevant multicast group information within a certain period of time, corresponding multicast list on the then aging described port; When the multicast data flow that causes described port to send owing to reasons such as described multicast member off-lines does not have corresponding receiving terminal, can make this port no longer send corresponding multicast data flow by aging.Its ageing process is specially: the corresponding relation of deleting multicast group information described in the described multicast list and described port.After certain hour was aging, the multicast list on the switch 61 was as shown in table 5:
Table 5
| Multicast mac address | Outbound port |
| GROUPA | a，b |
| GROUPB | a，b |
| GROUPC | b |
For the network with a plurality of multicast sources, the present invention can dispose many examples of hierarchical attribute log-in protocol, makes the corresponding multicast source of each example, then each embodiment is carried out aforesaid operations, finishes the renewal of multicast list.When same switch was in different examples, this switch was operated in corresponding example according to the role who represents in each example respectively, and the operation of this switch in each example is independent of each other.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
- Multicast list method for updating when 1, a kind of switching network topology changes, described switching network comprise root bridge switch and transmission bridge switch, it is characterized in that, may further comprise the steps:The topological structure that root bridge switch detects switching network changes or when receiving topology changed messages, sends configuration message and respectively transmits the bridge switch in the network;The described bridge switch that respectively transmits is reset port role, and the logon message of multicast group information is carried in switch transmission upstream;Each switch in the described switching network upgrades multicast list separately after reseting port.
- 2, multicast list method for updating during network topology change according to claim 1, it is characterized in that, before described bridge switch sends configuration message, also comprise: transmission bridge switch detects the topological structure of switching network, and the transmission bridge switch that is changed by structure when topological structure changes sends topology changed messages to described bridge switch.
- 3, multicast list method for updating during network topology change as claimed in claim 1 or 2, it is characterized in that, also comprise: after receiving described topology changed messages, it is invalid that the multicast list separately of the switch in the switching network is set to, and prevents that former multicast service from interrupting.
- 4, multicast list method for updating during network topology change as claimed in claim 1 or 2, it is characterized in that, the process whether described detection switching network topology structure changes is specially: whether described bridge switch and/or transmission bridge switch detect the link that is connected with other switches and change, if change, represent that then the switching network topology structure changes.
- As multicast list method for updating during network topology change as described in the claim 2, it is characterized in that 5, the described process that sends topology changed messages to root bridge switch specifically comprises:The transmission bridge switch that changes when described structure does not directly link to each other with root bridge switch, and then described transmission bridge switch sends topology changed messages along network topology to root bridge switch by the forwarding of adjacent transmission bridge switch;The transmission bridge switch that changes when described structure directly links to each other with root bridge switch, and then described transmission bridge switch directly sends topology changed messages to root bridge switch.
- 6, multicast list method for updating during network topology change according to claim 1 is characterized in that the described port role of resetting is specially:The inspection of described transmission bridge switch receives the port of described configuration message, and described port is set to root port.
- 7, as multicast list method for updating during network topology change as described in claim 1 or 6, it is characterized in that the detailed process of described renewal multicast list comprises:Described transmission bridge switch upgrades local multicast list according to multicast group under the logon message that receives, the connected user and the port role of self resetting;The inspection of described bridge switch receives the port of described logon message, and upgrades local multicast list according to the multicast group information that described port and described logon message carry.
- 8, as multicast list method for updating during network topology change as described in the claim 7, it is characterized in that, described bridge switch also comprises after upgrading local multicast list: if the port of described bridge switch is not received the logon message that carries relevant multicast group information within a certain period of time, and corresponding multicast list on the then aging described port.
- 9, a kind of root bridge switch of switching network is characterized in that, comprising: topology detection unit, message process unit, configuration message generation unit and multicast management unit;Described topology detection unit determines by detecting the link that is connected with local port whether the switching network topology structure changes;Described message process unit receives the type that message is also judged the message that receives, if the message that receives carries multicast group information, then triggers the multicast management unit and carries out respective handling;When the message that topological structure changes or described message process unit receives that detects switching network when described topology detection unit was topology changed messages, described configuration message generation unit generated and sent configuration message;Described multicast management unit, the multicast group information that the message that receives according to described message process unit carries is upgraded local multicast list.
- 10, as the root bridge switch of switching network as described in the claim 9, it is characterized in that, when the message that receives is logon message, described message process unit sends to described multicast management unit with multicast group information in the described logon message and the port information that receives described logon message, upgrades local multicast list.
- 11, a kind of transmission bridge switch of switching network is characterized in that, comprising: message process unit, port role are provided with unit and multicast management unit;Described message process unit receives the type that message is also judged the message that receives, if the message that receives carries multicast group information, then triggers the multicast management unit and carries out respective handling;When the message that receives when described message process unit was configuration message, described port role was provided with the unit according to the port that receives described configuration message, and port role is set;Described multicast management unit, multicast group information that the message that receives according to described message process unit carries and described port role are provided with the port role that the unit is provided with, and upgrade local multicast list.
- 12, as the transmission bridge switch of switching network as described in the claim 11, it is characterized in that, also comprise topology detection unit and topology changed messages generation unit;Described topology detection unit determines by detecting the link that is connected with local port whether the switching network topology structure changes;When described topology detection unit detected the switching network topology structure and changes, described topology changed messages generation unit generated and sent topology changed messages.
- 13, as the transmission bridge switch of switching network as described in the claim 11, it is characterized in that, also comprise the logon message generation unit,, generate also switch transmission upstream and carry the logon message of multicast group information according to the multicast group information of obtaining from described multicast management unit.
- 14, as the transmission bridge switch of claim 11 to 13 switching network as described in each, it is characterized in that when the message that receives was topology changed messages, described message process unit was controlled described multicast management unit, it is invalid making it that multicast list is set; When the message that receives was configuration message, described message process unit was controlled described port role the setting that the unit carries out port role is set; When the message that receives was logon message, described message process unit sent to described multicast management unit with multicast group information in the described logon message and the port information that receives described logon message, upgrades local multicast list.
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| WO2023035953A1 (en) * | 2021-09-13 | 2023-03-16 | 中兴通讯股份有限公司 | Method and apparatus for handling device roaming in mesh networking |
| CN115811496A (en) * | 2023-01-19 | 2023-03-17 | 北京国科天迅科技有限公司 | Method and device for recovering multicast service and electronic equipment |
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2007
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