CN101764812B - Method, router and network system for transmitting active source messages - Google Patents

Method, router and network system for transmitting active source messages Download PDF

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Publication number
CN101764812B
CN101764812B CN200910249585A CN200910249585A CN101764812B CN 101764812 B CN101764812 B CN 101764812B CN 200910249585 A CN200910249585 A CN 200910249585A CN 200910249585 A CN200910249585 A CN 200910249585A CN 101764812 B CN101764812 B CN 101764812B
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message
router
peer
msdp
forwarding
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CN101764812A (en
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梁艳荣
苏海洋
于云福
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention relates to method, router and network system for transmitting active source messages, wherein the method comprises the following steps of: receiving an SA message sent by the router of a last hop MSDP peer; detecting whether the SA cache table of a local router contains items (S and G) of the SA message; when the items (S and G) of the SA message do not exist in the SA cache table of the local router and the items (S and G) of the SA message exist in the SA cache table of the local router, if the interval of the time for receiving the SA message containing the items (S and G) this time and the previous time for transmitting the SA message containing the items (S and G) is larger than a preset time interval, transmitting the SA message, wherein the transmitted SA message contains the items (S and G). The embodiment of the invention lowers the configuration requirements of the MSDP peer, effectively prevents loops for transmitting the SA message from being formed and reduces the load of the local router.

Description

A kind of method of transmitting active source messages, router and network system
Technical field
The present invention relates to route technology, particularly a kind of method of transmitting active source messages, router and network system.
Background technology
Multicasting technology has been realized the efficient data transmission of IP network mid point to multiple spot; Because multicast is conserve network bandwidth, reduction network load effectively; So all be widely used aspect many in real time data transmission, multimedia conferencing, data copy, recreation and emulation etc.; And; Can utilize the multicast feature of network that some new value-added services are provided easily, comprise the information service field of the Internets such as online live, Web TV, long-distance education, tele-medicine, network radio station, real-time video meeting.
In the prior art; In order better to accomplish the data of sending multicast source; People adopt Multicast Source Discovery Protocol, and (Multicast Source Discovery Protocol MSDP), becomes the configuration of routers in the network relation of MSDP peer-to-peer; Transmitting active source between the MSDP peer-to-peer (Source Active, SA) message.
When the SA message sends at the network that enables the MSDP peer-to-peer; Need carry out reverse forward-path (Reverse Path Forwarding to receiving the SA message; RPF) inspection is spread unchecked to avoid the SA message in the network, perhaps causes and between the MSDP peer-to-peer, forms SA message forwarding loop.Rpf check is the IP address of MSDP peer-to-peer according to multicast source and destination; The upstream and downstream of clear and definite SA message forwarding path; The SA message that has only the interface of the MSDP peer-to-peer of the adjacency from the upper reaches to forward, local router just can be transmitted, otherwise will abandon.
In the prior art; Because carry out rpf check to the MSDP peer-to-peer that receives the SA message, more router must be configured to the relation of MSDP peer-to-peer in the whole network of needs, the forwarding strategy on each MSDP peer-to-peer must be identical; And same autonomous territory (Autonomous System; AS) the MSDP peer-to-peer in must be full connection group (Mesh Group), so the constraints that the configuration of routers in the network is required is a lot, if one of them MSDP peer-to-peer breaks down or forwarding strategy changes; Will cause normally to transmit the SA message, make the destination of SA message can't receive the SA message.
Summary of the invention
The purpose of this invention is to provide a kind of forwarding SA method of message, be used for solving the high problem of configuration requirement of prior art MSDP peer-to-peer.
For addressing the above problem, the invention provides a kind of forwarding SA method of message, router and network system, wherein, the method for transmitting active source messages comprises:
Receive last one and jump the SA message that Multicast Source Discovery Protocol MSDP peer-to-peer sends;
Detect (S, G) item that whether comprise multicast source IP and multicast destination IP in the said SA message in the SA-Cache table of local router;
In the SA-Cache table of said local router, do not exist in the said SA message (S in the time of G), transmits said SA message, comprise in the SA message of said forwarding said (S, G);
In the SA-Cache table of said local router, there is (the S in the said SA message; G) the time, if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit said SA message, comprise said (S, G) item in the SA message of said forwarding.
The embodiment of the invention also provides a kind of router of the SA of forwarding message, wherein, comprising:
Receiver module is used to receive one and jumps the SA message that the MSDP peer router sends;
Whether detection module comprises (S, G) item in the said SA message in the SA-Cache table of detection local router;
Sending module, be used for said local MSDP SA-Cache table do not exist in the said SA message (S is in the time of G); Transmit said SA message, and be used for if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit said SA message, that the said SA message of forwarding comprises is said (S, G).
The embodiment of the invention provides a kind of network system of the SA of forwarding message again, wherein, comprising:
Said MSDP peer-to-peer comprises receiver module, is used for the SA message that receiver module reception sources end convergent point sends;
Detection module is used for detecting local MSDP SA-Cache table and whether comprises (S, G) item in the SA message;
Sending module; Be used for SA-Cache table at local router do not exist in the SA message (S, transmit in the time of G) the SA message carry said (S, G); And be used for having (the S in the SA message at the SA-Cache table of local router; G) the time, will receive that (S G) carries forwarding by the SA message in the back at interval greater than Preset Time;
Said multicast destination is used to receive the multicast packet that said multicast source sends.
The embodiment of the invention has reduced the configuration requirement to the MSDP peer-to-peer; Avoid repeating to jump the MSDP peer router and transmit same SA message and cause spreading unchecked or forming the loop of transmitting the SA message of SA message in the network, reduce the load of local router forwarding SA message to next.
Description of drawings
Fig. 1 transmits the flow chart of active source SA method of message specific embodiment one for the embodiment of the invention;
Fig. 2 transmits the flow chart of active source SA method of message specific embodiment two for the embodiment of the invention;
Fig. 3 transmits the flow chart of active source SA method of message specific embodiment three for the embodiment of the invention;
Fig. 4 transmits the structure chart of the SA message in the active source SA method of message specific embodiment three for the embodiment of the invention;
Fig. 5 transmits the structural representation of the router specific embodiment one of SA message for the embodiment of the invention;
Fig. 6 transmits the structural representation of the router specific embodiment two of SA message for the embodiment of the invention;
Fig. 7 transmits the flow chart of the router specific embodiment two of SA message for the embodiment of the invention;
Fig. 8 is the structural representation of embodiment of the invention network system.
Embodiment
Through accompanying drawing and embodiment, technical scheme of the present invention is done detailed description further below.
The embodiment of the invention is transmitted active source SA method of message specific embodiment one
Fig. 1 transmits the flow chart of active source SA method of message specific embodiment one for the embodiment of the invention.As shown in Figure 1, the step of embodiment of the invention forwarding active source SA method of message specific embodiment one is specific as follows:
101, local router receives last one and jumps the SA message that the MSDP peer router sends.
When multicast source sends multicast packet to the multicast destination, at first multicast packet is sent to Designated Router (Designated Router), Designated Router is encapsulated in multicast packet in the logon message; Then with this logon message send to convergent point in the autonomous territory at multicast source place (Rendezvous Point, RP), this convergent point also is the MSDP peer-to-peer; Be commonly referred to source end convergent point, obtain the relevant information of multicast source behind the source end convergent point reception logon message, comprise the IP address of multicast source etc.; Create and send the SA message then, carry in the SA message at least one comprise multicast source IP and multicast destination IP (S, G); Wherein, (S, G) S in the item represents the multicast source IP of SA message; G represents the multicast source destination of SA message; Source end convergent point will periodically be transmitted this SA message to other MSDP peer-to-peer, and the forwarding cycle is generally 60s, after other MSDP peer-to-peer receives the SA message; Jump the MSDP peer router to next again and transmit this SA message, local router receives the SA message.
Whether (S, G) item in the SA message are arranged in the SA-Cache table of step 102, detection local router.
After local router receives the SA message, detect one by one whether include in the SA-Cache table of local router in this SA message that receives (S, G).If do not exist in the SA-Cache table of local router each bar of being comprised in the SA message (S G), then gets into step 103, otherwise, get into step 104.
Do not comprise in the SA-Cache table of step 103, local router in the SA message (S in the time of G), transmits the SA message.
Do not comprise in the SA-Cache table of local router in the SA message (S G), explains that local router is to receive this (S first; G) item, and this that perhaps once comprised (S, G) item is deleted from the SA-Cache table; At this moment, forwarding comprises this (S, G) SA message of item; In the SA-Cache table of local router, create then about multicast source, source end convergent point and the multicast destination of this SA message corresponding (S, G), and record comprises this (S in the SA-Cache table; G) the SA message forwarding time of item, just should (S, G) forwarding time of item.
There is (the S in the SA message in the SA-Cache table of step 104, local router; G) the time, if this reception comprise should (S, SA message G) comprises said (S with last forwarding; G) SA message interval greater than Preset Time at interval, transmit the SA message.
If exist in the SA-Cache table of local router in the SA message (S in the time of G), explains that local router has received and comprises this (S; G) SA message, then the timer of local router will calculate and transmit last time and comprise (S, G) SA message and this reception of item comprise this (S; G) time interval of the SA message of item; If should then will comprise this (S, G) SA message forwarding interval greater than Preset Time at interval; If this time interval is less than or equal to Preset Time at interval, then when transmitting the SA message, should (S G) deletes from the SA message, if all in the SA message (S, G) all deleted, then with the SA packet loss by item.
Under normal conditions, source end convergent point sends the cycle 60s of SA message, owing to reasons such as calculating routed paths; The time interval that source end convergent point sends the SA message possibly be greater than or less than 60s, and in embodiments of the present invention, Preset Time can be set at 30s at interval; When transmitted in last time comprise corresponding (S, that the time of SA message G) and this reception comprise is corresponding (S, G) the SA message of item is greater than 30s; Can think the SA message that this source end convergent point sends once more; Then transmit this SA message, and the forwarding in the SA-Cache table of renewal local router comprises corresponding (S, G) time of the SA message of item.
If comprising that local router receives again in 30s that same source end convergent point sends over corresponding (S, SA message G), then this SA message maybe since formation SA message loop or bypass forward; (S G) comprises corresponding (S, G) the SA message forwarding time of item with local SA-Cache souvenir carries to calculate each bar in the SA message; If each bar in the SA message (S, G) at this moment forwarding time all will own (S less than 30s in the item in the SA message; G) item all will be deleted, and this SA message will be dropped, to guarantee only to transmit once corresponding (S at introversive at interval next the jumping MSDP peer router of Preset Time; G) item effectively prevents to form the loop of transmitting the SA message, if in the Preset Time interval, receive the SA message that same source end convergent point sends; Each (S in the SA message; G) item all will be deleted, and this SA message will be done abandons outlet, transmits same SA message thereby avoid next to jump MSDP peer router.
In the embodiment of the invention, the MSDP peer-to-peer in the network need not possess identical forwarding strategy, and the MSDP peer-to-peer in the same autonomous territory need not be configured to full connection group (Mesh-Group) yet, has reduced the configuration requirement of MSDP peer-to-peer; When the SA-Cache table at local router do not comprise in the SA message (S, in the time of G), in this SA message (S G) is recorded in the SA-Cache table, transmits this SA message, and will write down to transmit and comprise this (S, G) the SA message time of item; In the SA-Cache table of local router, there is (the S in the SA message; G) the time; Only transmit greater than Preset Time at interval the back receive comprise should (S, SA message G) is avoided repeating to jump the forwarding of MSDP peer router to next and is comprised this (S; G) SA message and cause spreading unchecked or forming the loop of transmitting the SA message, the load of minimizing local router of SA message in the network.
The embodiment of the invention is transmitted active source SA method of message specific embodiment two
Further; The embodiment of the invention is on the basis of embodiment of the invention specific embodiment one; Local router can also be according to the SA-Cache table after upgrading, from source end convergent point to each on one jump comprise the repeating process of MSDP peer router corresponding (S, SA message G) is forwarded on the path of least number of times; The corresponding last jumping MSDP peer router conduct of selection in real time should (S, G) the MSDP forwarding router of item.
Fig. 2 transmits the flow chart of active source SA method of message specific embodiment two for the embodiment of the invention.As shown in Figure 2, the embodiment of the invention is transmitted active source SA method of message specific embodiment two and is specifically comprised the steps:
Step 201, local router receive the SA message.
Local router receives last one and jumps the SA message that the MSDP peer router sends, and comprises at least one (S, G) item in the SA message.
Whether comprise (S, G) item in the SA message in the SA-Cache table of step 202, detection local router.
After local router receives the SA message, whether include (S, G) item in the SA message that receives in the SA-Cache table of detection local router.
(S in not comprising this SA message that receives in the SA-Cache table of local router; G) the time; Local router will be created (the S corresponding to the multicast source, source end convergent point and the multicast destination that send this SA message in the SA-Cache table of self; G) item behind the SA-Cache table of renewal local router, gets into step 203.
As (the S that exists in the SA-Cache table of local router in this SA message that receives; G) the time; Timer in the local router calculate this reception of local router comprise should (S, SA message G) comprises this (S, G) time interval of the SA message of item with forwarding last time; If interval greater than Preset Time at interval, then get into step 203.
The SA message that step 203, local router are transmitted comprises this (S, G) item.
Local router transmits and to include in the cache table and do not exist that (when S, G) SA message, will include in the SA message of forwarding should (S, G) item; Perhaps (S, SA message G), and transmitted with last time and to comprise this (S are transmitted and to be included in the cache table and exist to local router; G) SA message interval greater than at interval SA message of Preset Time the time; Local router is transmitted this SA message, will include this (S, G) item in this SA message; Comprise this (S if local router receives; G) SA message with transmitted last time comprise should (S, G) time interval of the SA message of item is less than or equal to the Preset Time interval, then should (S; G) item is deleted from the SA message; If all in the SA message (S, G) item is all deleted, and then the SA message will be dropped.Forwarding comprise this (when S, G) SA message, need upgrade simultaneously in the SA-Cache table about comprise should (S, forwarding time G), should (S, forwarding time G) be and comprises this (S, G) the SA message forwarding time of item.
Step 204, local router are selected the MSDP forwarding router in real time according to preset selective rule.
(S, G) corresponding MSDP forwarding router are should (S, SA message G) is forwarded in the path of local router, the last jumping MSDP peer router in the minimum path of hop count with comprising.Local router selects to be somebody's turn to do (S, G) the MSDP forwarding router of item in real time according to the information such as IP address of a last jumping MSDP peer router of source end convergent point and each forwarding SA message; Local router is transmitted comprise (S, SA message G) must be from this (S, MSDP forwarding router G) forwards; Select the MSDP forwarding router can reduce this (S; G) hop count of item reduces the forwarding of local router and loads, and improves the efficient that local router is transmitted the SA message.
At first, on local router, select the MSDP forwarding router in real time in the jumping MSDP peer router group, be specially according to preset selective rule:
If have only a unique MSDP peer-to-peer to be connected, then at first select this MSDP peer-to-peer as the MSDP forwarding router with local router; Otherwise, detect last one and jump in the MSDP peer router group whether comprise source end convergent point, if active end convergent point, then selecting source end convergent point is the MSDP forwarding router.
If jumping not comprise in the MSDP peer router group last one one jumps the MSDP peer router on above-mentioned two types, then select the high MSDP peer-to-peer of priority according to preset route priority rule, preset route priority rule comprises:
Be in MP-BGP (Multiprotocol Border Gateway Protocol; The priority of the MSDP peer-to-peer on the forward-path MBGP) is in Border Gateway Protocol (BorderGateway Protocol; The priority of the MSDP peer-to-peer on the forward-path BGP); The priority that is in the MSDP peer-to-peer on the forward-path of bgp protocol is higher than and is in Interior Gateway Protocol (Interior Gateway Protocol, the priority of the MSDP peer-to-peer on forward-path IGP).
In the MSDP peer group in the path that is in the issue of MBGP agreement or bgp protocol, the priority of the MSDP peer-to-peer in the autonomous territory AS in non-this locality is higher than the priority of the MSDP peer-to-peer in the local autonomous territory at local router place;
In the MSDP peer group in autonomous territory, non-this locality, the priority of the MSDP peer-to-peer that the autonomous territory at distance sources end convergent point place is near is high more;
In the MSDP peer-to-peer in autonomous territory, this locality, be higher than the priority of broadcaster's MSDP peer-to-peer as the priority of the MSDP peer-to-peer of next jumping of end convergent point route to the source;
When the priority of MSDP peer-to-peer is equal, select the big last jumping MSDP peer router in IP address as the MSDP forwarding router.
When not having above-mentioned MSDP peer router, select static reverse path to transmit the RPF peer-to-peer as the MSDP forwarding router.
Purpose according to the MSDP forwarding router of presetting the selection of route priority rule is to make to comprise corresponding (S; G) SA message from the source end convergent point minimum to the hop count of local router, just make corresponding (S, hop count G) is minimum; If the SA message is few to the hop count in the process of local router at source end convergent point; Can reduce the forwarding load of MSDP peer-to-peer, avoid spreading unchecked of SA message, improve SA message forwarding efficient.
The embodiment of the invention is jumped in the MSDP peer router group last one in real time and is selected the MSDP forwarding router; And the routing iinformations such as IP address of MSDP forwarding router are stored in the SA-Cache table of local router; When local router receives the SA message; At first detect whether include in the SA-Cache table on the local router with the SA message in comprise each bar (S, the G) routing iinformation of the MSDP forwarding router that is complementary of item, if do not exist in the SA-Cache table with the SA message in (S; G) record of a MSDP forwarding router that is complementary then gets into step 203; If exist in the SA-Cache table about in the SA message (S, G) record of the MSDP forwarding router that is complementary of item detects then whether whether this SA message is by this (S; G) MSDP forwarding router forwards, if not, then should (S; G) from the deletion of SA message, if comprise should (S, G) the SA message of item is by this (S; G) the MSDP forwarding router of item forwards, and judges that then this time that receives this SA message and last the forwarding comprise this (S, G) time interval of the SA message of item; If should then in the SA message of transmitting, comprise this (S, G) item interval greater than Preset Time at interval; If this time interval is less than or equal to Preset Time at interval, then deletion should (S, G) item in the SA message of transmitting.The MSDP forwarding router is that source end convergent point comprises corresponding (S to the path of local router; A last jumping MSDP peer router of the least number of times that SA message G) is forwarded; Guarantee simultaneously local router Preset Time only transmit at interval once comprise this (S, G) the SA message of item prevents spreading unchecked of SA message; Alleviate the load of local router, improved the SA message from the source end convergent point to the forward efficiency of local router.
If reasons such as the MSDP forwarding router breaks down or forwarding strategy changes no longer E-Packet; Local router is not received the SA message of the forwarding of this MSDP forwarding router in preset forwarding time; Then local router will be deleted the record about this MSDP forwarding router in the SA-Cache table; And receive the SA message that jumping MSDP peer router is transmitted on other again, get into step 201.In embodiments of the present invention, preset forwarding time can be sent three times of cycle of SA message for source end convergent point, and for example to send the cycle of SA message be 60s to source end convergent point, and then Preset Time can be 180s.
The SA message from the source end convergent point to the process of transmitting of local router; When following situation takes place when; For example: the MSDP peer-to-peer between source end convergent point and the local router breaks down; Routing iinformations such as the IP address of source end convergent point or MSDP peer-to-peer or Routing Protocol change or the forwarding strategy of MSDP peer-to-peer changes and when in preset forwarding time, not transmitting the SA message that this source end convergent point sends; Local router can be according to source end convergent point and MSDP peer-to-peer IP address or other routing iinformation; Select the MSDP forwarding router in real time, leave, improve the efficient of transmitting the SA message to reduce the route distance of SA message in repeating process.
The embodiment of the invention is through select the MSDP forwarding router in real time, make local router Preset Time only transmit at interval once by (S, G) the corresponding MSDP forwarding router of item forwards is included in the corresponding (S in the SA message; G) item; Should (S, G) item effectively prevent the spreading unchecked of SA message in the network to avoid repeating jumping to next that SA message duplicate packages that the MSDP peer router transmits contains; Reduce the chance that forms the loop of transmitting the SA message, reduce the load of local router.
The embodiment of the invention is transmitted active source SA method of message specific embodiment three
Further, the embodiment of the invention is on the basis of embodiment of the invention specific embodiment one or specific embodiment two, can select the MSDP forwarding router according to the hop count of SA message in the process of transmitting.
Fig. 3 transmits the flow chart of active source SA method of message specific embodiment three for the embodiment of the invention.As shown in Figure 3, the embodiment of the invention is transmitted active source SA method of message specific embodiment three and is specifically comprised the steps:
Step 301, local router receive the SA message.
When source end convergent point is created the SA message; Remove in the SA message and carry active end convergent point and comprise multicast source IP and the (S of multicast destination IP; G) information such as item; Also will in the reserved field in the SA message, expand a field and write down SA message forwarding number of times, Fig. 4 transmits the structure chart of the SA message in the active source SA method of message specific embodiment three for the embodiment of the invention.As shown in Figure 4, call the field of 8 bit lengths in the storage field in the SA message and put down in writing SA message forwarding number of times.After local router receives the SA message, will make SA message forwarding number of times increase by 1.Hop count SA message source end convergent point is set to 0 when being created, and after the SA message was issued, every through a MSDP peer-to-peer forwarding, hop count increased by 1.
Whether comprise (S, G) item in the SA message in the SA-Cache table of step 302, detection local router.
Do not comprise (the S in this SA message that receives in the SA-Cache table of local router; G) the time, local router is created (S, G) item corresponding to the multicast source, source end convergent point and the multicast destination that send this SA message in the SA-Cache table; And extract the hop count in the SA message of this reception; The SA message forwarding number of times that record sends about this source end convergent point in the SA-Cache table then upgrades the SA-Cache table, gets into step 303 then.
There is the corresponding (S in the SA message in the SA-Cache table of local router; G) the time; Timer in the local router calculate this reception of local router comprise should (S, SA message G) comprises this (S, G) time interval of the SA message of item with forwarding last time; If interval greater than Preset Time at interval, then get into step 303.
The SA message that step 303, local router are transmitted comprises this (S, G) item.
After local router receives the SA message, local MSDP will transmit the SA message according to the testing result of step 302; Comprise (the S in the SA message that is included in that receives first in the SA message of transmitting; G), and Preset Time receive after at interval be included in the SA message (S, G); Upgrade simultaneously in the SA-Cache table about this comprise this (S, SA message forwarding time G), just should (S, forwarding time G); Local router extracts this SA message forwarding number of times, and store into corresponding in the SA-Cache table (S, G) bar of a hop count upgrades the SA-Cache table now; Comprise should (S, SA message G) and this reception comprise should (S, the time interval of SA message G) be less than or equal to the Preset Time interval, will (S, G) item is deleted from the SA message of forwarding to this if transmitted last time.
Step 304, local router are selected the MSDP forwarding router in real time according to hop count.
That extracts in the local router comparison SA-Cache table comprises (S; G) the SA message relay times of item, just (S, G) hop count of item; Select last one on the minimum path of hop count to jump the MSDP peer router as being somebody's turn to do (S, G) the MSDP forwarding router of item.
(S is G) behind the MSDP forwarding router of item, when local router receives the SA message once more in selection; At first detect whether include in the SA-Cache table on the local router with the SA message in comprise each bar (S, the G) routing iinformation of the MSDP forwarding router that is complementary of item is if comprise (S; G) SA message be by this (S, MSDP forwarding router G) forwards, and judges that then this time that receives this SA message and last the forwarding comprise this (S; G) time interval of the SA message of item was if should then comprise this (S interval greater than Preset Time at interval in the SA message of transmitting; G) item; If this time interval is less than or equal to Preset Time at interval, then deletion should (S, G) item in the SA message of transmitting.
The embodiment of the invention selects in real time the MSDP forwarding router according to the hop count that carries in the SA message; Operation is simple, do not need the routing iinformation of calculation sources end convergent point and each MSDP peer-to-peer, reduced the route amount of calculation of MSDP peer-to-peer; And local router is only transmitted once by (S in the Preset Time interval; G) corresponding MSDP forwarding router forwards is included in corresponding in the SA message (S G), prevents the spreading unchecked of SA message in the network; The chance that reduces and form the loop of transmitting the SA message, the load of reduction local router.
The embodiment of the invention is transmitted the router specific embodiment one of SA message
Fig. 5 transmits the structural representation of the router specific embodiment one of SA message for the embodiment of the invention.As shown in Figure 5, the router specific embodiment one that the embodiment of the invention is transmitted the SA message comprises: receiver module 501, detection module 502 and sending module 503; Wherein, receiver module 501 be used for receiving one jump SA-Cache table that SA message, detection module 502 that the MSDP peer-to-peer sends be used for detecting local router whether comprise said SA message (S, G); Sending module 502 be used for SA-Cache table at local router do not exist in the said SA message (S in the time of G), transmits the SA message; Comprise in the SA message of transmitting that said (G), and there is (the S in the said SA message in S in the SA-Cache table of local router; G) the time, if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit said SA message, comprise said (S, G) item in this SA message.Source end convergent point periodically sends the SA message, and the cycle is generally 60s, can Preset Time be set at 30s at interval, repeats to transmit same the SA message that same source end convergent point sends avoiding, and causes spreading unchecked of SA message forwarding loop or SA message.
The embodiment of the invention detect through detection module whether comprise in the SA-Cache table of local router in the SA message (G), there is not (the S in the SA message in S in the SA-Cache table of local router; G) the time, sending module is transmitted the SA message, in the SA-Cache table of local router, has (the S in the SA message; G) the time, only transmit that the back comprising of receiving should (S, G) the SA message of item at interval greater than Preset Time; Guarantee that sending module transmits once at Preset Time that (S, G) item avoid causing spreading unchecked of SA message in the network at interval; Effectively prevent to form the loop of transmitting the SA message, reduce the load of local router.
The embodiment of the invention is transmitted the router specific embodiment two of SA message
Fig. 6 transmits the structural representation of the router specific embodiment two of SA message for the embodiment of the invention.As shown in Figure 6, to transmit in the embodiment of the invention on the basis of router specific embodiment one of SA message, embodiment of the invention MSDP peer-to-peer further comprises: cache module 504, select module 505 and removing module 506; Wherein, cache module 504 be used for SA-Cache table at local router do not exist in the SA message (S, in the time of G), with in the SA message (S G) adds in the SA-Cache table, and record is transmitted and comprised corresponding (S, the time of SA message G); Cache module is used for also comprising in this reception that corresponding (S, the time of SA message G) comprises that corresponding (S, at interval the time, record is transmitted and comprised corresponding (S, G) time of the SA message of item greater than Preset Time at the interval of SA message forwarding time G) with transmitting last time.Select module 505 be used for according to preset selective rule from the source end convergent point select in real time to comprise to the path of local router that (S, the last jumping MSDP peer router in the few path of SA message forwarding number of times G) is as the MSDP forwarding router.Removing module 506 be used for the comprising of this reception (S, SA message G) with transmitted last time comprise should (S, the time interval of SA message G) is less than or equal to Preset Time at interval, (S, G) item is deleted from said SA message with said when forwarding SA message.
The embodiment of the invention writes down through cache module and comprises (S, G) the SA message forwarding time of item, and this (S in the SA-Cache table of renewal local router; G) forwarding time of item, select the MSDP forwarding router in real time through selecting module, if comprise this (S; G) SA message be by this (S, MSDP forwarding router G) forwards, and judges that then this time that receives this SA message and last the forwarding comprise this (S; G) time interval of the SA message of item was if should then comprise this (S interval greater than Preset Time at interval in the SA message of transmitting; G) item, if this time interval is less than or equal to Preset Time at interval, then (S is somebody's turn to do in deletion in the SA message of transmitting; G) item; Form the chance of SA message forwarding loop with effective minimizing, reduce the forwarding load of local router, and improved the SA message from the source end convergent point to the forward efficiency of local router.
Fig. 7 transmits the flow chart of the router specific embodiment two of SA message for the embodiment of the invention.As shown in Figure 7, the flow process of transmitting the router specific embodiment two of SA message in the embodiment of the invention specifically comprises the steps:
Step 701, receiver module receive the SA message.
Source end convergent point is periodically transmitted the SA message to other MSDP peer-to-peer; Receiver module 501 receives from last one and jumps the SA message that MSDP peer router or source end convergent point send over; Carry active end convergent point in the SA message and comprise multicast source IP and one or more different (S, G) information such as item of multicast destination IP.After local router receives the SA message, get into step 702.
Whether (S, G) item in the SA message are arranged in the SA-Cache table of step 702, detection module detection local router.
After local router receives the SA message, whether include (S, G) item in the SA message that receives in the SA-Cache table of detection module 502 detection local routers.If do not comprise in the SA-Cache table of local router in the SA message (S G), then gets into step 703, otherwise, get into step 704.
Do not comprise in the SA-Cache table of step 703, local router in the SA message (S, in the time of G), sending module is transmitted the SA message.
In the SA-Cache table of local router, do not include in the SA message (S, during G) information, sending module 503 is transmitted the SA messages.And; The cache module 504 of local router will be created (the S corresponding to the multicast source, source end convergent point and the multicast destination that send this SA message in the SA-Cache table of local router; G) item, this transmits time time of SA message the timer record in the local router.
Include in the SA-Cache table of step 704, local router in the SA message (S, in the time of G), sending module will the back comprising of receiving should (S, SA message forwarding G) at interval greater than Preset Time.
There is (the S in the SA message in the SA-Cache table of local router; G) the time, the timer of local router will calculate to be transmitted the SA message that same source end convergent point sends last time and received the time interval of SA message with this, if this is interval greater than the Preset Time interval; Sending module is transmitted this SA message; Simultaneously, cache module 504 upgrade in the SA-Cache tables about this (S, forwarding time G); Otherwise, will be when transmitting this SA message, removing module 506 will (S, G) a SA message deletion from forwarding.
Step 705, selection module select to select in real time the MSDP forwarding router.
Select module 505 on local router, to select the MSDP forwarding router in real time in the jumping MSDP peer router group, be specially according to preset selective rule:
If have only a unique MSDP peer-to-peer to be connected, then select module 505 at first to select this MSDP peer-to-peer as the MSDP forwarding router with local router; Otherwise, detect last one and jump in the MSDP peer router group whether comprise source end convergent point, if active end convergent point, then selecting source end convergent point is the MSDP forwarding router.
If jumping not comprise in the MSDP peer router group last one one jumps the MSDP peer router on above-mentioned two types, then select the high MSDP peer-to-peer of priority according to preset route priority rule, preset route priority rule comprises:
The priority that is in the MSDP peer-to-peer on the forward-path of MBGP agreement is higher than the priority of the MSDP peer-to-peer on the forward-path that is in bgp protocol, and the priority that is in the MSDP peer-to-peer on the forward-path of bgp protocol is higher than the priority of the MSDP peer-to-peer on the forward-path that is in the IGP agreement.
In the MSDP peer group in the path that is in the issue of MBGP agreement or bgp protocol, the priority of the MSDP peer-to-peer autonomous territory, non-this locality in is higher than the priority of the MSDP peer-to-peer in the local autonomous territory that local router belongs to;
In the MSDP peer group in autonomous territory, non-this locality, the priority of the MSDP peer-to-peer that the autonomous territory at distance sources end convergent point place is near is high more;
In the MSDP peer-to-peer in autonomous territory, this locality, be higher than the priority of broadcaster's MSDP peer-to-peer as the priority of the MSDP peer-to-peer of next jumping of end convergent point route to the source;
When the priority of MSDP peer-to-peer is equal, select the big last jumping MSDP peer router in IP address as the MSDP forwarding router.
When not having above-mentioned MSDP peer router, select static reverse path to transmit the RPF peer-to-peer as the MSDP forwarding router.
If reasons such as the MSDP forwarding router breaks down or forwarding strategy changes no longer E-Packet; Local router is not received the SA message of the forwarding of this MSDP forwarding router in preset forwarding time; Then local router will be deleted the record about this MSDP forwarding router in the SA-Cache table, and receive the SA message that jumping MSDP peer router is transmitted on other again.
Step 706, sending module are transmitted the SA message that the MSDP forwarding router forwards.
Local router is stored in the routing iinformations such as IP address of the IP address of MSDP forwarding router and corresponding source end convergent point in the SA-Cache table of itself; The SA message that source end convergent point sends once more will carry routing iinformations such as MSDP forwarding router IP address; After local router receives the SA message, local MSDP will detect whether include MSDP forwarding router corresponding (S, G) item in this SA message according to the SA-Cache table; If have, local router will be transmitted this SA message; Otherwise, will do discard processing to this SA message.
The embodiment of the invention is jumped in the MSDP peer router group last one and is selected the MSDP forwarding router in real time, make local router Preset Time only transmit at interval once by (S, G) the corresponding MSDP forwarding router of item forwards is included in the corresponding (S in the SA message; G) item; With avoid repeating to next jump SA message duplicate packages that the MSDP peer router transmits contain should (S, G), with minimizing SA message forwarding number of times; Improve SA message forwarding efficient; And effectively prevent the spreading unchecked of SA message in the network, and reduce the chance that forms the loop of transmitting the SA message, alleviate the load of local router.
The embodiment of the invention is transmitted the router specific embodiment three of SA message
In the embodiment of the invention, select module to transmit SA message forwarding number of times to local router, select (the S in the SA message according to source end convergent point; G) on the minimum path of hop count corresponding last one jump the MSDP peer router as should (S, G) the MSDP forwarding router of item is if comprise this (S; G) SA message be by this (S, MSDP forwarding router G) forwards, and judges that then this time that receives this SA message and last the forwarding comprise this (S; G) time interval of the SA message of item was if should then comprise this (S interval greater than Preset Time at interval in the SA message of transmitting; G) item; If this time interval is less than or equal to Preset Time at interval, then deletion should (S, G) item from the SA message of transmitting.
Source end convergent point removes and carries active end convergent point and comprise at least one (S, G) information such as item in the SA message when encapsulation SA message; The field that also includes record SA message forwarding number of times in the SA message; As shown in Figure 4, when SA message source end convergent point was created, hop count was set to 0; After the SA message is issued; Every through a MSDP peer-to-peer, hop count increases by 1, selects last one on the minimum path of hop count to jump the MSDP forwarding router of MSDP peer router as local router.
The embodiment of the invention selects in real time the MSDP forwarding router according to the hop count that carries in the SA message; Operation is simple; The routing iinformation that does not need calculation sources end convergent point and each MSDP peer-to-peer has reduced the route amount of calculation of MSDP peer-to-peer, and local router is only transmitted in the Preset Time interval once by (S; G) corresponding MSDP forwarding router forwards is included in the corresponding (S in the SA message; G) item to avoid causing the loop that spreads unchecked or form the SA message of the SA message in the network, reduces the load of local router.
The specific embodiment of embodiment of the invention network system
Fig. 8 is the structural representation of embodiment of the invention network system.As shown in Figure 8, the network system that the embodiment of the invention is transmitted the SA message comprises: multicast source 801, router five 00 and multicast destination 802; Wherein, multicast source 801 provides multicast packet, and router five 00 is transmitted the SA message, and multicast destination 802 receives the SA message.Router five 00 as source end convergent point can be packaged into (the S that carries multicast source IP and multicast destination IP with multicast packet; G) information SA message such as item; And being forwarded to multicast destination 802, multicast destination 802 is separated the acquisition multicast packet of being honored as a queen with the SA message after receiving this SA message.
Router five 00 can adopt foregoing invention embodiment to transmit in the arbitrary specific embodiment of device of SA message structure to form; In the present invention is among the embodiment; Router five 00 adopts the structure in the device specific embodiment one of stating inventive embodiments forwarding SA message to form, and comprising: receiver module 501, detection module 502 and sending module 503; Wherein, receiver module 501 be used for receiving one jump SA-Cache table that SA message, detection module 502 that the MSDP peer-to-peer sends be used for detecting local router whether comprise the SA message (S, G); Sending module 502 be used for SA-Cache table at local router do not exist in the SA message (S in the time of G), transmits the SA message; Comprise in the SA message of transmitting that said (G), and there is the corresponding (S in the said SA message in S in the SA-Cache table of local router; G) the time, and if that this reception comprises is corresponding (S, the time of SA message G) comprises this (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit the SA message, comprise (S, G) item in the SA message of forwarding.
Embodiment of the invention network system is when transmitting the SA message; If the SA-Cache table of local router do not comprise in the SA message (S in the time of G), directly transmits this SA message; And with (the S in this SA message; G) item is recorded in the SA-Cache table, each bar that comprises in the SA message that record is transmitted (S, G) refresh time of item; In the SA-Cache table of local router, exist in the SA message (in the time of G), there is (the S in the SA message in S in the SA-Cache table of local router; G) the time, only transmit that the back comprising of receiving should (S, G) the SA message of item at interval greater than Preset Time; Avoid repeating to jump the forwarding of MSDP peer router and comprise this (S to next; G) SA message and cause spreading unchecked of SA message in the network prevents to form the loop of transmitting the SA message, reduces the load of local router.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims (14)

1. a transmitting active source SA method of message is characterized in that, comprising:
Receive last one and jump the SA message that Multicast Source Discovery Protocol MSDP peer-to-peer sends;
Whether comprise multicast source IP and multicast destination IP (S, G) item in the said SA message in the SA-Cache table of detection local router;
In the SA-Cache table of said local router, do not exist in the said SA message (S in the time of G), transmits said SA message, comprise in the SA message of said forwarding said (S, G);
In the SA-Cache table of said local router, there is (the S in the said SA message; G) the time, if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit said SA message, comprise said (S, G) item in the SA message of said forwarding;
Said in the SA-Cache table of local router, do not exist in the said SA message (S, in the time of G), transmit said SA message and also comprise:
With in the said SA message (S G) adds in the SA-Cache table of said local router, and record is transmitted and comprised said (S, the time of SA message G) in the SA-Cache table of said local router.
2. forwarding SA method of message according to claim 1; It is characterized in that, said if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time is transmitted said SA message and is also comprised greater than Preset Time at interval:
Record comprises said (S, G) the SA message forwarding time of item in the SA-Cache table of said local router.
3. forwarding SA method of message according to claim 1 is characterized in that, the said SA message of said forwarding also comprises:
When the comprising of this reception (S, SA message G) with transmitted last time comprise said (S, the time interval of SA message G) is less than or equal to Preset Time at interval, then when transmitting said SA message, (S G) deletes from said SA message with said.
4. forwarding SA method of message according to claim 1 is characterized in that, after said forwarding SA message, also comprises:
According to preset selective rule from the source end convergent point to the path of local router; Select said (S in real time; G) the MSDP peer router is jumped as the MSDP forwarding router in last one in the few path of hop count, and local router is transmitted greater than what Preset Time received at interval and comprised said (S, G) the SA message of item; That the said SA message of transmitting carries is said (S, G).
5. forwarding SA method of message according to claim 4; It is characterized in that; The preset selective rule of said basis from the source end convergent point to the path of local router; Select in real time said (S, the last jumping MSDP peer router in the few path of hop count G) comprises as the MSDP forwarding router:
One jumps in the MSDP peer router group on said, and the unique adjacent last jumping MSDP peer router of selection and said local router, source end convergent point are as the MSDP forwarding router;
When not having the MSDP forwarding router of the above-mentioned type in the said last jumping MSDP peer router group, select the high MSDP peer-to-peer of priority as the MSDP forwarding router according to preset route priority rule;
When the priority of said MSDP peer-to-peer is equal, select the big last jumping MSDP peer router in IP address as the MSDP forwarding router;
When not having above-mentioned MSDP peer router, select static reverse path to transmit the RPF peer-to-peer as the MSDP forwarding router.
6. forwarding SA method of message according to claim 5 is characterized in that, said preset route priority rule comprises:
The priority that is in the MSDP peer-to-peer on the forward-path of MP-BGP MBGP is higher than the priority of the MSDP peer-to-peer on the forward-path that is in Border Gateway Protocol (BGP), and the priority of the MSDP peer-to-peer on the said forward-path that is in the bgp protocol issue is higher than the priority of the MSDP peer-to-peer on the forward-path that is in Interior Gateway Protocol IGP issue;
In the MSDP peer group on the forward-path that is in MBGP or BGP issue, the priority of the MSDP peer-to-peer in the autonomous territory AS in non-this locality is higher than the priority of the MSDP peer-to-peer in the local autonomous territory at local router place;
In the MSDP peer group in autonomous territory, non-this locality, the priority of the MSDP peer-to-peer that the autonomous territory at distance sources end convergent point place is near is high more;
In the MSDP peer-to-peer in autonomous territory, this locality, be higher than the priority of broadcaster's MSDP peer-to-peer as the priority of the MSDP peer-to-peer of next jumping of end convergent point route to the source.
7. forwarding SA method of message according to claim 4; It is characterized in that; The preset selective rule of said basis from the source end convergent point to the path of local router; Select in real time said (S, the last jumping MSDP peer router in the few path of hop count G) comprises as the MSDP forwarding router:
The field of expansion record hop count in said SA message; Write down the hop count of said SA message from source end convergent point to the local router path; Select last one on the little path of said hop count to jump the MSDP peer router as (S, G) the MSDP forwarding router of item transmitted in the said SA message.
8. a router of transmitting the SA message is characterized in that, comprising:
Receiver module is used to receive one and jumps the SA message that the MSDP peer router sends;
Whether detection module comprises (S, G) item in the said SA message in the SA-Cache table of detection local router;
Sending module, be used for said local MSDP SA-Cache table do not exist in the said SA message (S is in the time of G); Transmit said SA message, and be used for if this reception comprise (S, the time of SA message G) comprises (S with forwarding last time; G) the interval of SA message forwarding time greater than Preset Time at interval; Transmit said SA message, that the said SA message of forwarding comprises is said (S, G);
Cache module; There is not (the S in the said SA message in the SA-Cache table that is used for said local router; G) the time, with in the said SA message (S G) adds in the said SA-Cache table; And the record forwarding comprises said (S, G) time of the SA message of item in the SA-Cache table of said local router.
9. the router of forwarding SA message according to claim 8; It is characterized in that; Said cache module also be used for comprising in this reception (S, the time of SA message G) transmitted with last time and comprise (S, the interval of SA message forwarding time G) is during greater than the Preset Time interval; Record is transmitted and is comprised said (S, G) time of the SA message of item.
10. the router of forwarding SA message according to claim 8 is characterized in that, also comprises:
Removing module, be used for comprising of this reception said (S, SA message G) with transmitted last time comprise said (S, the time interval of SA message G) is less than or equal to Preset Time at interval the time, (S, G) item is deleted from said SA message with said.
11. according to Claim 8 or the routers of 9 described forwarding SA messages, it is characterized in that also comprising:
Select module, be used for according to preset selective rule from the source end convergent point select in real time to the path of local router that said (S, the last jumping MSDP peer router in the few path of hop count G) is as the MSDP forwarding router.
12. the router of forwarding SA message according to claim 11 is characterized in that said selection module specifically is used for:
One jumps in the MSDP peer router group on said, and the unique adjacent last jumping MSDP peer router of selection and said local router, source end convergent point are as the MSDP forwarding router;
When not having the MSDP forwarding router of the above-mentioned type in the said last jumping MSDP peer router group, select the high MSDP peer-to-peer of priority as the MSDP forwarding router according to preset route priority rule;
When the priority of Routing Protocol is equal, select the big MSDP peer-to-peer in IP address as the MSDP forwarding router;
When not existing above-mentioned last one to jump the MSDP peer router, select static reverse path to transmit the RPF peer-to-peer as the MSDP forwarding router.
13. the router of forwarding SA message according to claim 11 is characterized in that also comprising:
Select module, be used for selecting to comprise that said (S, the MSDP peer router is jumped as said (S, G) the MSDP forwarding router of item in last one on the minimum path of SA message forwarding number of times G).
14. a network system that adopts the router of any described forwarding SA message of claim 8-13 is characterized in that comprising: multicast source, router and multicast destination;
Said multicast source is used to send multicast packet;
Said router is used to receive one and jumps the SA message that the MSDP peer router sends; Whether comprise (S, G) item in the said SA message in the SA-Cache table of detection local router; In said local MSDPSA cache table, do not exist in the said SA message (S in the time of G), transmits said SA message; And be used for if this reception comprises (S; The time of SA message G) transmitted with last time and comprise (S, said SA message is transmitted greater than the Preset Time interval in the interval of SA message forwarding time G); That the said SA message of transmitting comprises is said (S, G); Said (the S that in the SA-Cache table of local router, does not exist in the said SA message; G) the time; Transmitting said SA message also comprises: with (the S in the said SA message; G) item adds in the SA-Cache table of said local router, and the record forwarding comprises said (S, G) time of the SA message of item in the SA-Cache table of said local router;
Said multicast destination is used to receive said SA message.
CN200910249585A 2009-12-30 2009-12-30 Method, router and network system for transmitting active source messages Expired - Fee Related CN101764812B (en)

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