CN103581027A - Method for establishing optimized PIM-SM multicast route - Google Patents
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Abstract
The invention provides a method for establishing an optimized PIM-SM multicast route. Through a customized PIM protocol message, a PIM request message is sent to the downstream from a first-skip router, and whether a downstream router can establish multicast route forwarding entries or not is inquired; after the downstream router establishes the multicast route forwarding entries, a response that the multicast route forwarding entries are successfully established is sent upstream; after the response is received, the first-skip router generates its own multicast route forwarding entries; then, a whole multicast route forwarding tree is established well, and multicast data flow can be forwarded through the multicast forwarding tree. According to the method for establishing the optimized PIM-SM multicast route, the multicast data flow can be sent upstream to a CPU only on the first-skip router, and therefore work pressure of the CPU is relieved, and serious faults such as overtime of a protocol state machine are avoided.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to the method that a kind of optimization sparse mode independent multicast agreement (Protocol Independent Multicast-Sparse Mode, PIM-SM) Multicast Routing is set up.
Background technology
Most switches, for unknown multicast data flow, is all to utilize forwarding engine the multicast data message transmitted to CPU receiving at present, sends to control plane.Software adds multicast routing table to preserve routing iinformation according to consensus standard RFC4601, and is submitted to the converting route of forwarding engine, for controlling the forwarding of multicast message.
PIM-SM be a kind of can be effectively by IP message routing to crossing over the agreement of network (between WAN and territory) multicast group on a large scale.PIM-SM agreement does not rely on any specific unicast routing protocol, is mainly designed to support sparse group.It has used traditional IP multicast model based on receiving initialization member relation, supports to share and shortest path tree, and it has also used soft state mechanism in addition, to adapt to the network environment of continuous variation.It can use by any Routing Protocol and be input to the routing iinformation in Multicast Routing information bank, these Routing Protocols comprise unicast protocol, if routing information protocol is with Open Shortest Path First, also comprise the multicast protocol that can produce routing table, as Distance Vector Multicast Routing Protocol.
Application number is 200810225542.3, denomination of invention is < < method for forwarding multicast message and the Chinese patent of device > > in a kind of method for forwarding multicast message is disclosed, it comprises the following steps: forbid that well-known multicast message directly send software protocol layer; Obtaining hit in tag in multicast routing table is the list item hitting; According to the object multicast address in list item, build virtual multicast message and send software protocol layer.
Application number is 200510103457.6, denomination of invention is the Chinese patent [2] that < < optimizes the method > > that sets up PIM-DM route table items, it discloses a kind of method that PIM-DM route table items is set up in optimization, comprises the following steps: upstream PIM-DM router is learnt the new PIM-DM neighbor router in downstream; Upstream PIM-DM router is set up spurious multicasts stream, and described spurious multicasts stream is sent to the new PIM-DM neighbor router in downstream; The new PIM-DM neighbor router in downstream is set up multicast routing table item according to the spurious multicasts stream receiving.
Yet, in prior art, the inevasible transmitted to CPU of multicast traffic stream in multicast routing table item process of establishing.If flow is greatly, can impact CPU, cause resource occupied.If CPU is all the time in busy state, variety of protocol can not get enough scheduling times, thereby causes the catastrophe failures such as protocol state machine is overtime.
Summary of the invention
The shortcoming of prior art in view of the above, a kind of method that the object of the present invention is to provide the PIM-SM of optimization Multicast Routing to set up, it can be set up in Multicast Routing process in PIM-SM agreement, the problem that expends a large amount of cpu resources of avoiding happening suddenly a large amount of unknown multicast data flow transmitted to CPU and causing, fully guarantees the normal operation of switch.
For achieving the above object and other relevant objects, the invention provides a kind of method that the PIM-SM of optimization Multicast Routing is set up, wherein, self-defined PIM protocol massages, described PIM protocol massages comprises the version of PIM protocol massages stem, style number, request/acknowledgement field, verification and, the group IP address of the source IP address of multicast traffic stream and multicast traffic stream, wherein, by defining the style number of described PIM protocol massages stem, described PIM protocol massages is defined as to PIM request/response message, and according to request/acknowledgement field, to define described PIM protocol massages be PIM request message or PIM response message, the method that described optimization PIM-SM Multicast Routing is set up at least comprises the following steps: first-hop router sends PIM request message to downstream direction, with the router in hop-by-hop inquiry downstream, whether needs to set up Multicast Routing forwarding entry, if connect recipient's router, need the multicast traffic stream in PIM request message, set up Multicast Routing forwarding entry, and toward source side to hop-by-hop, send PIM response message after Multicast Routing forwarding entry is successfully established, the router that receives PIM response message judges whether source IP address and group IP address in PIM response message are the address of asking, if it is set up Multicast Routing forwarding entry, and continue toward source side to sending PIM response message, when first-hop router receives after PIM response message, set up the Multicast Routing forwarding entry of self, so far completed the foundation of multicast transmit tree.
The method of setting up according to above-mentioned optimization PIM-SM Multicast Routing, wherein: also comprise: multicast traffic stream forwards by the multicast transmit tree establishing.
The method of setting up according to above-mentioned optimization PIM-SM Multicast Routing, wherein: when request/acknowledgement field is 1, described PIM protocol massages is expressed as PIM request message; When request/acknowledgement field is 2, described PIM protocol massages is expressed as PIM response message.
The method of setting up according to above-mentioned optimization PIM-SM Multicast Routing, wherein: the field of verification and verification comprises whole PIM protocol massages stem, source IP address and group IP address.
Meanwhile, the present invention also provides a kind of method of applying above-mentioned optimization PIM-SM Multicast Routing foundation in multicast share tree, to set up the method for PIM-SM Multicast Routing, and it comprises the following steps:
On multicast share tree, first-hop router is received multicast traffic stream, generates and sends PIM logon message to convergent point router, and convergent point router judges whether the router in downstream needs this multicast traffic stream; If do not needed, convergent point router sends stopped registration messages to first-hop router, stops the forwarding of this multicast traffic stream;
If needed, (S, G) that convergent point router sends corresponding to this multicast traffic stream toward first-hop router joins message;
After first-hop router receives that (S, G) joins message, send PIM request message to convergent point router;
Convergent point router is received after PIM request message, to first-hop router, sends stopped registration messages, and toward recipient's direction Reseal and transmission PIM request message;
PIM request message is along the path of multicast share tree, at convergent point router to hop-by-hop transmission in recipient's router direction; When connecting recipient's router, receive after PIM request message, resolve PIM request message and obtain source IP address and group IP address, and set up the Multicast Routing forwarding entry of self;
After the Multicast Routing forwarding entry of connection recipient's router is successfully established, continue to send PIM response message toward convergent point router direction hop-by-hop; PIM response message is along the path of multicast share tree, at recipient's router to hop-by-hop transmission in convergent point router direction; The router that connects recipient is set up Multicast Routing forwarding entry toward convergent point router direction hop-by-hop, until convergent point router establishes the Multicast Routing forwarding entry of self, convergent point router sends PIM response message toward first-hop router direction hop-by-hop again;
First-hop router is received the PIM response message that convergent point router sends, and sets up the Multicast Routing forwarding entry of self, so far completes the foundation of multicast share tree.
According to the above-mentioned method of setting up PIM-SM Multicast Routing in multicast share tree, wherein: multicast traffic stream forwards by the multicast share tree establishing.
According to the above-mentioned method of setting up PIM-SM Multicast Routing in multicast share tree, wherein: after first-hop router receives that (S, G) joins message, while sending PIM request message to convergent point router, after 1 second, again send this PIM request message, to prevent packet loss.
In addition, the present invention also provides a kind of method of applying above-mentioned optimization PIM-SM Multicast Routing foundation in multicast shortest path tree, to set up the method for PIM-SM Multicast Routing, wherein: comprise the following steps:
On multicast shortest path tree, first-hop router is received joining message of downstream, judges whether multicast traffic stream has recipient; When having recipient, first-hop router sends PIM request message toward recipient's direction hop-by-hop, until connect recipient's router, receives;
The router that connects recipient is received after PIM request message, resolves and obtains source IP address and group IP address, sends PIM response message, and set up the Multicast Routing forwarding entry of self toward source side to hop-by-hop; When first-hop router, receive after PIM response message, set up the Multicast Routing forwarding entry of self.
According to the above-mentioned method of PIM-SM Multicast Routing of setting up in multicast shortest path tree, wherein: on multicast shortest path tree, first-hop router is received joining message as PIM(S, G of downstream) join message or IGMP joins message.
According to the above-mentioned method of PIM-SM Multicast Routing of setting up in multicast shortest path tree, wherein: multicast traffic stream forwards by the multicast shortest path tree establishing.
As mentioned above, the method that optimization PIM-SM Multicast Routing of the present invention is set up, has following beneficial effect:
(1) in multicast forwarding process of establishing, first set up multicast transmit tree, rear multicast data forwarding stream, the CPU that multicast traffic stream is only sent in meeting on first-hop router, thus improved the ability of router deal with data;
(2) alleviate the operating pressure of CPU, avoided the appearance of the catastrophe failures such as protocol state machine is overtime.
Accompanying drawing explanation
Fig. 1 is shown as the flow chart of the method for optimization PIM-SM Multicast Routing of the present invention foundation;
Fig. 2 is shown as the schematic diagram that method that optimization of the present invention PIM-SM Multicast Routing sets up is applied in multicast share tree;
Fig. 3 is shown as the schematic diagram that method that optimization of the present invention PIM-SM Multicast Routing sets up is applied in multicast shortest path tree;
Fig. 4 is shown as the form schematic diagram of PIM protocol massages part of the present invention.
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
The method that optimization of the present invention PIM-SM Multicast Routing is set up is for the multicast traffic stream of the large flow of burst, for switch provides a kind of multicast transmit tree of first setting up, and the method for rear multicast data forwarding stream.First-hop router is received after multicast traffic stream, sends PIM request message toward downstream, and whether the multicast group in inquiry multicast traffic stream can set up Multicast Routing forwarding entry.Router when downstream establishes after Multicast Routing forwarding entry, and upstream router hop-by-hop transmission is set up Multicast Routing forwarding entry and successfully responded; Receive after this response, first-hop router just can generate the Multicast Routing forwarding entry of self.So far, whole multicast transmit tree establishes, can multicast data forwarding stream.If the router in downstream does not transfer interface or sets up the failure of Multicast Routing forwarding entry, can not send it back toward upstream should.If all downstream routers all do not have to respond, first-hop router can not forward these multicast traffic streams.
Particularly, the present invention is self-defined PIM protocol massages, wherein, the object IP address of PIM protocol massages is 224.0.0.13, style number be 9, PIM protocol massages part form as shown in Figure 4.
Wherein, the Ver of version number of PIM protocol massages stem is 2, and style number Type is 9, is defined as PIM request/response message.Wherein, the reserved field of PIM protocol massages stem (Reserved) is as request/acknowledgement field (Request/Reply).When Request/Reply is 1, represent request (Request); When being 2, represent to reply (Reply).Source Address is the source IP address of multicast traffic stream, the group IP address that Group multicast Address is multicast traffic stream.Verification and Checksum be a standard IP verification and, the field of verification comprises whole PIM protocol massages stem, source IP address and group IP address.PIM protocol massages is 1 in the ttl field value of IP stem.
As shown in Figure 1, the method that optimization PIM-SM Multicast Routing of the present invention is set up specifically comprises the following steps:
Step S1: first-hop router is 9 to downstream direction transmission types number, whether the PIM request message that Request/Reply field is 1, need to set up Multicast Routing forwarding entry with the router in hop-by-hop inquiry downstream.
Step S2: need the multicast traffic stream in PIM request message if connect recipient's router, set up Multicast Routing forwarding entry, and toward source side, to hop-by-hop transmission types number, be that 9, Request/Reply field is 2 PIM response message after Multicast Routing forwarding entry is successfully established.
Step S3: the router that receives PIM response message judges whether source IP address and group IP address in PIM response message are the address of asking; If it is set up Multicast Routing forwarding entry, and continue toward source side to sending PIM response message.
Step S4: when first-hop router receives after PIM response message, set up the Multicast Routing forwarding entry of self.So far, from first-hop router, to the router that connects terminal, all establish Multicast Routing forwarding entry, multicast transmit tree has been set up.
Step S5: multicast traffic stream forwards by the multicast transmit tree establishing.
With reference to Fig. 2, the idiographic flow of applying the method that optimization of the present invention PIM-SM Multicast Routing sets up on multicast share tree is as described below:
(1) on multicast share tree, first-hop router is received multicast traffic stream, generate and send PIM logon message to convergent point router, convergent point router can know downstream router add information, and know whether the router in downstream needs this multicast traffic stream.If do not needed, convergent point router sends stopped registration messages to first-hop router, stops the forwarding of this multicast traffic stream;
(2) if needed, (S, G) that convergent point router sends corresponding to this multicast traffic stream toward first-hop router joins message, to add multicast share tree.
(3) after first-hop router receives that (S, G) joins message, transmission types number be 9, Request/Reply field be 1 PIM request message to convergent point router, and sent once again after 1 second, prevent packet loss.
(4) convergent point router is received after this PIM request message, to first-hop router, sends stopped registration messages, and toward recipient's direction Reseal and transmission PIM request message.
(5) PIM request message is along the path of multicast share tree, hop-by-hop transmission the router direction from convergent point router to recipient.When connecting recipient's router, receive after PIM request message, resolve PIM request message and obtain source IP address and group IP address, and set up Multicast Routing forwarding entry according to the processing mode of receiving multicast traffic stream.
(6), after Multicast Routing forwarding entry is successfully established, it is that 9, Request/Reply field is 2 PIM response message that the router that connects recipient continues toward hop-by-hop transmission types number in convergent point router direction.PIM response message is along the path of multicast share tree, from recipient's router to hop-by-hop transmission convergent point router; The router that connects recipient is set up source IP address in PIM response message and the Multicast Routing forwarding entry of group IP address toward hop-by-hop in convergent point router direction, until convergent point router successfully establishes Multicast Routing forwarding entry.So far, convergent point router has been set up to the multicast share tree between recipient's router, and convergent point router sends PIM response message toward first-hop router direction hop-by-hop again.
(7) first-hop router receives the PIM response message that convergent point router sends, and sets up the Multicast Routing forwarding entry of self, and so far first-hop router establishes to the multicast share tree between convergent point router, and multicast traffic stream can normally forward.
With reference to Fig. 3, the idiographic flow of applying the method that optimization of the present invention PIM-SM Multicast Routing sets up in multicast shortest path tree is as described below:
(1), on multicast shortest path tree, first-hop router is received PIM(S, the G of the router in downstream) join message or IGMP joins message, judge whether multicast traffic stream has recipient.When having recipient, first-hop router is that 9, Request/Reply field is 1 PIM request message toward recipient's direction hop-by-hop transmission types number, until connect recipient's router, receives;
(2) router that connects recipient is received after PIM request message, parsing obtains source IP address and group IP address, and to hop-by-hop transmission types number, be that 9, Request/Reply field is 2 PIM response message toward source side, and set up the Multicast Routing forwarding entry of self.When first-hop router, receive after PIM response message, while establishing the Multicast Routing forwarding entry of self, multicast traffic stream is successfully forwarded to recipient's router from first-hop router, and multicast shortest path tree is successfully established.
In sum, the method that optimization of the present invention PIM-SM Multicast Routing is set up, the CPU that multicast traffic stream is only sent in meeting on first-hop router, thus alleviated the operating pressure of CPU, avoided the appearance of the catastrophe failures such as protocol state machine is overtime.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (10)
1. optimize the method that PIM-SM Multicast Routing is set up for one kind, it is characterized in that, self-defined PIM protocol massages, described PIM protocol massages comprise PIM protocol massages stem version, style number, request/acknowledgement field, verification and, the source IP address of multicast traffic stream and the group IP address of multicast traffic stream, wherein, by defining the style number of described PIM protocol massages stem, described PIM protocol massages is defined as to PIM request/response message, and according to described request/acknowledgement field, to define described PIM protocol massages be PIM request message or PIM response message;
The method that described optimization PIM-SM Multicast Routing is set up at least comprises the following steps:
First-hop router sends PIM request message to downstream direction, with the router in hop-by-hop inquiry downstream, whether needs to set up Multicast Routing forwarding entry;
If connect recipient's router, need the multicast traffic stream in PIM request message, set up Multicast Routing forwarding entry, and toward source side to hop-by-hop, send PIM response message after Multicast Routing forwarding entry is successfully established;
The router that receives PIM response message judges whether source IP address and group IP address in PIM response message are the address of asking; If it is set up Multicast Routing forwarding entry, and continue toward source side to sending PIM response message;
When first-hop router receives after PIM response message, set up the Multicast Routing forwarding entry of self, so far completed the foundation of multicast transmit tree.
2. the method that optimization PIM-SM Multicast Routing according to claim 1 is set up, is characterized in that: also comprise: multicast traffic stream forwards by the multicast transmit tree establishing.
3. the method that optimization PIM-SM Multicast Routing according to claim 1 is set up, is characterized in that: when request/acknowledgement field is 1, described PIM protocol massages is expressed as PIM request message; When request/acknowledgement field is 2, described PIM protocol massages is expressed as PIM response message.
4. the method that optimization PIM-SM Multicast Routing according to claim 1 is set up, is characterized in that: the field of verification and verification comprises whole PIM protocol massages stem, source IP address and group IP address.
5. the method that application rights requires the optimization PIM-SM Multicast Routing described in 1 to set up is set up a method for PIM-SM Multicast Routing in multicast share tree, it is characterized in that: comprise the following steps:
On multicast share tree, first-hop router is received multicast traffic stream, generates and sends PIM logon message to convergent point router, and convergent point router judges whether the router in downstream needs this multicast traffic stream; If do not needed, convergent point router sends stopped registration messages to first-hop router, stops the forwarding of this multicast traffic stream;
If needed, (S, G) that convergent point router sends corresponding to this multicast traffic stream toward first-hop router joins message;
After first-hop router receives that (S, G) joins message, send PIM request message to convergent point router;
Convergent point router is received after PIM request message, to first-hop router, sends stopped registration messages, and toward recipient's direction Reseal and transmission PIM request message;
PIM request message is along the path of multicast share tree, at convergent point router to hop-by-hop transmission in recipient's router direction; When connecting recipient's router, receive after PIM request message, resolve PIM request message and obtain source IP address and group IP address, and set up the Multicast Routing forwarding entry of self;
After the Multicast Routing forwarding entry of connection recipient's router is successfully established, continue to send PIM response message toward convergent point router direction hop-by-hop; PIM response message is along the path of multicast share tree, at recipient's router to hop-by-hop transmission in convergent point router direction; The router that connects recipient is set up Multicast Routing forwarding entry toward convergent point router direction hop-by-hop, until convergent point router establishes the Multicast Routing forwarding entry of self, convergent point router sends PIM response message toward first-hop router direction hop-by-hop again;
First-hop router is received the PIM response message that convergent point router sends, and sets up the Multicast Routing forwarding entry of self, so far completes the foundation of multicast share tree.
6. the method for setting up PIM-SM Multicast Routing in multicast share tree according to claim 5, is characterized in that: multicast traffic stream forwards by the multicast share tree establishing.
7. the method for setting up PIM-SM Multicast Routing in multicast share tree according to claim 5, it is characterized in that: after first-hop router receives that (S, G) joins message, while sending PIM request message to convergent point router, after 1 second, again send this PIM request message, to prevent packet loss.
8. the method that application rights requires the optimization PIM-SM Multicast Routing described in 1 to set up is set up a method for PIM-SM Multicast Routing in multicast shortest path tree, it is characterized in that: comprise the following steps:
On multicast shortest path tree, first-hop router is received joining message of downstream, judges whether multicast traffic stream has recipient; When having recipient, first-hop router sends PIM request message toward recipient's direction hop-by-hop, until connect recipient's router, receives;
The router that connects recipient is received after PIM request message, resolves and obtains source IP address and group IP address, sends PIM response message, and set up the Multicast Routing forwarding entry of self toward source side to hop-by-hop; When first-hop router, receive after PIM response message, set up the Multicast Routing forwarding entry of self.
9. the method for setting up PIM-SM Multicast Routing in multicast shortest path tree according to claim 8, it is characterized in that: on multicast shortest path tree, first-hop router is received joining message as PIM(S, G of downstream) join message or IGMP joins message.
10. the method for setting up PIM-SM Multicast Routing in multicast shortest path tree according to claim 8, is characterized in that: multicast traffic stream forwards by the multicast shortest path tree establishing.
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| WO2015032337A1 (en) * | 2013-09-06 | 2015-03-12 | 上海斐讯数据通信技术有限公司 | Method for optimizing pim-sm multicast route establishment |
| CN108430039A (en) * | 2017-01-20 | 2018-08-21 | 迈普通信技术股份有限公司 | A kind of multicast optimization method, multicast equipment and system |
| CN115632979A (en) * | 2022-12-19 | 2023-01-20 | 成都菁蓉联创科技有限公司 | Communication data forwarding method, system and storage medium |
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| CN115529265B (en) * | 2022-09-30 | 2024-04-30 | 上海博达数据通信有限公司 | Optimal selection method for PIMSM router upstream path |
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| CN115632979A (en) * | 2022-12-19 | 2023-01-20 | 成都菁蓉联创科技有限公司 | Communication data forwarding method, system and storage medium |
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| WO2015032337A1 (en) | 2015-03-12 |
| CN103581027B (en) | 2017-06-16 |
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