CN103581027B - A kind of method that optimization PIM SM Multicast Routings are set up - Google Patents
A kind of method that optimization PIM SM Multicast Routings are set up Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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Abstract
Whether the present invention provides a kind of method that optimization PIM SM Multicast Routings are set up, and it passes through customized PIM protocol massages, and PIM request messages are sent toward downstream from first-hop router, inquires the router in downstream and can set up Multicast Routing forwarding entry；After the router in downstream establishes Multicast Routing forwarding entry, it is sent upstream by setting up Multicast Routing forwarding entry and successfully responds；After receiving the response, first-hop router generates the Multicast Routing forwarding entry of itself；So far, whole multicast forwarding tree establishes, you can by multicast forwarding tree multicast data forwarding stream.The CPU that the method that optimization PIM SM Multicast Routings of the invention are set up causes multicast traffic stream only to be sent in meeting on first-hop router, so as to alleviate the operating pressure of CPU, it is to avoid the appearance of the catastrophe failure such as protocol state machine time-out.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of optimization sparse mode Protocol Independent Multicast
The method that (Protocol Independent Multicast-Sparse Mode, PIM-SM) Multicast Routing is set up.
Background technology
Current most of interchanger, for unknown multicast data flow, is all using forwarding engine the multicast for receiving
Data message transmitted to CPU, is sent to control plane.Routing iinformation is added multicast routing table by software according to consensus standard RFC4601
Preserve, and be submitted to the converting route of forwarding engine, the forwarding for controlling multicast message.
PIM-SM is that one kind can be effectively by IP message routings to the association across network (between WAN and domain) multicast group on a large scale
View.PIM-SM agreements do not rely on any specific unicast routing protocol, are primarily designed to support sparse group.It has used biography
The IP multicast models based on reception initialization member relation of system, support shared and shortest path tree, and it also uses soft in addition
Status mechanism, to adapt to the network environment being continually changing.It can use and be input to Multicast Routing information by any Routing Protocol
Routing iinformation in storehouse, these Routing Protocols include unicast protocol, and such as routing information protocol is also wrapped with Open Shortest Path First
Include the multicast protocol that can produce routing table, such as Distance Vector Multicast Routing Protocol.
It is Application No. 200810225542.3, entitled《A kind of method for forwarding multicast message and device》China specially
A kind of method for forwarding multicast message is disclosed in profit, it is comprised the following steps：Well-known multicast message is forbidden directly to send software protocol
Layer；Hit in tag is the list item for hitting in obtaining multicast routing table；Purpose multicast address in list item, builds virtual multicast
Message send software protocol layer.
It is Application No. 200510103457.6, entitled《The method that PIM-DM route table items are set up in optimization》China
Patent, it discloses a kind of method for optimizing and setting up PIM-DM route table items, comprises the following steps：Upstream PIM-DM routers
Practise to the new PIM-DM neighbor routers in downstream；Upstream PIM-DM routers set up spurious multicasts stream, and by the spurious multicasts
Stream is sent to the new PIM-DM neighbor routers in downstream；The new PIM-DM neighbor routers in downstream are according to the spurious multicasts for receiving
Stream sets up multicast routing table item.
However, in the prior art, the inevasible transmitted to CPU of multicast traffic stream during multicast routing table item foundation.
If flow greatly if can impact CPU, cause resource occupied.If CPU is in busy state all the time, various agreements cannot foot
Enough scheduling times, so as to cause the catastrophe failures such as protocol state machine time-out.
The content of the invention
The shortcoming of prior art, PIM-SM Multicast Routings are optimized it is an object of the invention to provide one kind in view of the above
The method of foundation, it can be during PIM-SM agreements set up Multicast Routing, it is to avoid sent in a large amount of unknown multicast data flows of burst
CPU and the problem of a large amount of cpu resources of consuming that causes, fully ensure that the normal operation of interchanger.
In order to achieve the above objects and other related objects, the present invention provides the side that a kind of optimization PIM-SM Multicast Routings are set up
Method, wherein, self-defined PIM protocol massages, the version of PIM protocol massages including PIM protocol massages stems, style number, please
Ask/acknowledgement field, verification and, the group IP address of the source IP address of multicast traffic stream and multicast traffic stream, wherein, by defining
State the style number of PIM protocol massages stems and the PIM protocol massages be defined as PIM requests/response message, and according to request/
It is PIM request messages or PIM response messages that acknowledgement field defines the PIM protocol massages；The optimization PIM-SM Multicast Routings
The method of foundation is at least comprised the following steps：First-hop router sends PIM request messages to most downstream direction, under being inquired with hop-by-hop
Whether the router of trip needs to set up Multicast Routing forwarding entry；If the router of connection recipient is needed in PIM request messages
Multicast traffic stream, then set up Multicast Routing forwarding entry, and after Multicast Routing forwarding entry is successfully established toward source direction by
Jump and send PIM response messages；Receive source IP address and group IP that the router of PIM response messages is judged in PIM response messages
Whether address is requested address；If it is Multicast Routing forwarding entry is set up, and continues to send PIM responses toward source direction
Message；After first-hop router receives PIM response messages, the Multicast Routing forwarding entry of itself is set up, so far complete group
Broadcast the foundation of forwarding tree.
According to the method that above-mentioned optimization PIM-SM Multicast Routings are set up, wherein：Also include：Multicast traffic stream is by setting up
Good multicast forwarding tree is forwarded.
According to the method that above-mentioned optimization PIM-SM Multicast Routings are set up, wherein：It is described when request/acknowledgement field is 1
PIM protocol massages are expressed as PIM request messages；When request/acknowledgement field is 2, the PIM protocol massages are expressed as PIM should
Answer message.
According to the method that above-mentioned optimization PIM-SM Multicast Routings are set up, wherein：The field of verification and verification is comprising whole
PIM protocol massages stem, source IP address and group IP address.
Meanwhile, it is shared in multicast that the present invention also provides a kind of method for applying above-mentioned optimization PIM-SM Multicast Routings foundation
The method that PIM-SM Multicast Routings are set up in tree, it is comprised the following steps：
On multicast share tree, first-hop router receives multicast traffic stream, generates and sends PIM logon messages to convergent point
On router, convergent point router judges whether the router in downstream needs the multicast traffic stream；If it is not needed, convergent point road
Stopped registration messages are sent to first-hop router by device, terminates the forwarding of the multicast traffic stream；
If desired, convergent point router sends (S, G) addition report corresponding to the multicast traffic stream toward first-hop router
Text；
First-hop router is received after (S, G) join message, and sends PIM request messages to convergent point router；
After convergent point router receives PIM request messages, stopped registration messages, and past reception are sent to first-hop router
Person direction Reseals and sends PIM request messages；
PIM request messages along multicast share tree path, on the router direction of convergent point router to recipient
Hop-by-hop is transmitted；When connect recipient router receive PIM request messages after, parsing PIM request messages obtain source IP address and
Group IP address, and set up the Multicast Routing forwarding entry of itself；
After the Multicast Routing forwarding entry of the router of connection recipient is successfully established, continue toward convergent point router direction
Hop-by-hop sends PIM response messages；PIM response messages along multicast share tree path, recipient router to convergent point
Hop-by-hop transmission on router direction；The router for connecting recipient sets up Multicast Routing forwarding toward convergent point router direction hop-by-hop
Entry, until convergent point router establishes the Multicast Routing forwarding entry of itself, convergent point router is again toward first-hop router
Direction hop-by-hop sends PIM response messages；
First-hop router receives the PIM response messages that convergent point router sends, and sets up the Multicast Routing of itself turn
Clockwork spring mesh, so far completes the foundation of multicast share tree.
According to the above-mentioned method that PIM-SM Multicast Routings are set up in multicast share tree, wherein：Multicast traffic stream passes through
The multicast share tree for establishing is forwarded.
According to the above-mentioned method that PIM-SM Multicast Routings are set up in multicast share tree, wherein：First-hop router is received
After (S, G) joins message, when sending PIM request messages to convergent point router, the PIM request messages are sent again after 1 second,
To prevent packet loss.
In addition, the method that the present invention also provides a kind of above-mentioned optimization PIM-SM Multicast Routings foundation of application is most short in multicast
The method that PIM-SM Multicast Routings are set up in path tree, wherein：Comprise the following steps：
On multicast shortest path tree, first-hop router receives joining message for downstream, judges whether multicast traffic stream has
Recipient；When there is recipient, first-hop router sends PIM request messages toward recipient direction hop-by-hop, until connection recipient
Router receive；
After the router of connection recipient receives PIM request messages, parsing obtains source IP address and group IP address, toward source side
PIM response messages are sent to hop-by-hop, and sets up the Multicast Routing forwarding entry of itself；When first-hop router receives PIM response reports
Wen Hou, sets up the Multicast Routing forwarding entry of itself.
According to the above-mentioned method that PIM-SM Multicast Routings are set up in multicast shortest path tree, wherein：It is most short in multicast
On path tree, first-hop router receives the joining message as PIM (S, G) joins message or IGMP joins message of downstream.
According to the above-mentioned method that PIM-SM Multicast Routings are set up in multicast shortest path tree, wherein：Multicast traffic stream
Forwarded by the multicast shortest path tree for establishing.
As described above, the method that optimization PIM-SM Multicast Routings of the invention are set up, has the advantages that：
(1) during multicast forwarding foundation, multicast forwarding tree, rear multicast data forwarding stream so that multicast number are first set up
According to the CPU that stream only send in meeting on first-hop router, so as to improve the ability of router processing data；
(2) operating pressure of CPU is alleviated, it is to avoid the appearance of the catastrophe failure such as protocol state machine time-out.
Brief description of the drawings
Fig. 1 is shown as the flow chart of the method that optimization PIM-SM Multicast Routings of the invention are set up；
Fig. 2 is shown as the signal that the method for optimization PIM-SM Multicast Routings foundation of the invention is applied in multicast share tree
Figure；
What the method that Fig. 3 is shown as optimization PIM-SM Multicast Routings foundation of the invention was applied in multicast shortest path tree
Schematic diagram；
Fig. 4 is shown as the form schematic diagram of PIM protocol massages part of the invention.
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages of the invention and effect easily.The present invention can also be by specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
It should be noted that the diagram provided in the present embodiment only illustrates basic conception of the invention in a schematic way,
Then component count, shape and size when only display is with relevant component in the present invention rather than according to actual implementation in schema are painted
System, it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout kenel also may be used
Can be increasingly complex.
The method that optimization PIM-SM Multicast Routings of the invention are set up, for the multicast traffic stream of burst big flow, is exchange
Machine provides one kind and first sets up multicast forwarding tree, the method for rear multicast data forwarding stream.First-hop router receives multicast traffic stream
Afterwards, PIM request messages are sent toward downstream, whether the multicast group in inquiry multicast traffic stream can set up Multicast Routing forwarding bar
Mesh.After the router in downstream establishes Multicast Routing forwarding entry, Multicast Routing is set up in router hop-by-hop transmission upstream
Forwarding entry is successfully responded；After receiving the response, first-hop router can just generate the Multicast Routing forwarding entry of itself.Extremely
This, whole multicast forwarding tree establishes, you can multicast data forwarding stream.If the router in downstream do not forward outgoing interface or
The failure of Multicast Routing forwarding entry is set up, then will not be sent back toward upstream should.If all downstream routers are not all responded, head is jumped
Router will not then forward these multicast traffic streams.
Specifically, the self-defined PIM protocol massages of the present invention, wherein, the purpose IP address of PIM protocol massages are
224.0.0.13, style number be 9, PIM protocol massages part form it is as shown in Figure 4.
Wherein, the version number Ver of PIM protocol massages stem is 2, and style number Type is 9, is defined as PIM request/response reports
Text.Wherein, the reserved field (Reserved) of PIM protocol massages stem is used as request/acknowledgement field (Request/Reply).
When Request/Reply is 1, request (Request) is represented；When for 2 when, represent response (Reply).Source Address
It is the source IP address of multicast traffic stream, Group multicast Address are the group IP address of multicast traffic stream.Verification and
Checksum is an IP verification for standard with the field of verification includes whole PIM protocol massages stem, source IP address and group IP
Address.PIM protocol massages are 1 in the ttl field value of IP stems.
As shown in figure 1, the method that optimization PIM-SM Multicast Routings of the invention are set up specifically includes following steps：
Step S1：First-hop router is to the PIM that most downstream direction transmission types number are that 9, Request/Reply fields are 1
Whether request message, need to set up Multicast Routing forwarding entry with the router in hop-by-hop inquiry downstream.
Step S2：If the router of connection recipient needs the multicast traffic stream in PIM request messages, multicast path is set up
By forwarding entry, and past source direction hop-by-hop transmission types number are 9, Request/ after Multicast Routing forwarding entry is successfully established
Reply fields are 2 PIM response messages.
Step S3：Receive source IP address and group IP address that the router of PIM response messages is judged in PIM response messages
Whether it is requested address；If it is Multicast Routing forwarding entry is set up, and continues to send PIM response reports toward source direction
Text.
Step S4：After first-hop router receives PIM response messages, the Multicast Routing forwarding entry of itself is set up.Extremely
This, the router from first-hop router to connection terminal all establishes Multicast Routing forwarding entry, and multicast forwarding tree is set up and completes.
Step S5：The multicast forwarding tree that multicast traffic stream passes through to establish is forwarded.
Reference picture 2, on multicast share tree using optimization PIM-SM Multicast Routings of the invention foundation method it is specific
Flow is as described below：
(1) on multicast share tree, first-hop router receives multicast traffic stream, generates and sends PIM logon messages to remittance
On accumulation router, convergent point router would know that the addition information of the router in downstream, and know downstream router whether
Need the multicast traffic stream.If it is not needed, convergent point router sends stopped registration messages to first-hop router, terminate the group
The forwarding of multicast data stream；
(2) if desired, convergent point router sends (S, the G) addition corresponding to the multicast traffic stream toward first-hop router
Message, to add multicast share tree.
(3) first-hop router is received after (S, G) join message, and transmission types number are 1 for 9, Request/Reply fields
PIM request messages are retransmited once after 1 second to convergent point router, prevent packet loss.
(4) after convergent point router receives the PIM request messages, stopped registration messages are sent to first-hop router, and
PIM request messages are Resealed and send toward recipient direction.
(5) PIM request messages along multicast share tree path, the router direction from convergent point router to recipient
Upper hop-by-hop transmission.After the router for connecting recipient receives PIM request messages, parsing PIM request messages obtain source IP address
With a group IP address, and Multicast Routing forwarding entry is set up according to the processing mode for receiving multicast traffic stream.
(6) after Multicast Routing forwarding entry is successfully established, the router for connecting recipient continues toward convergent point router side
Upward hop-by-hop transmission types number are the PIM response messages that 9, Request/Reply fields are 2.PIM response messages are common along multicast
The path of tree is enjoyed, is transmitted to hop-by-hop convergent point router from the router of recipient；Connect the past convergence of router of recipient
Hop-by-hop sets up the Multicast Routing forwarding entry of the source IP address and group IP address in PIM response messages on point router direction,
Until convergent point router has been successfully established Multicast Routing forwarding entry.So far, router of the convergent point router to recipient
Between multicast share tree set up complete, convergent point router again toward first-hop router direction hop-by-hop send PIM response messages.
(7) first-hop router receives the PIM response messages that convergent point router sends, and sets up the multicast path of itself
By forwarding entry, so far first-hop router is established to the multicast share tree between convergent point router, and multicast traffic stream can be normal
Forwarding.
Reference picture 3, the method set up using optimization PIM-SM Multicast Routings of the invention in multicast shortest path tree
Idiographic flow is as described below：
(1) on multicast shortest path tree, first-hop router receive the router in downstream PIM (S, G) join message or
Person IGMP joins message, and judges whether multicast traffic stream has recipient.When there is recipient, first-hop router is toward recipient direction
Hop-by-hop transmission types number are the PIM request messages that 9, Request/Reply fields are 1, until the router for connecting recipient is received
Arrive；
(2) after the router of connection recipient receives PIM request messages, parsing obtains source IP address and group IP address, and
Toward source direction hop-by-hop transmission types number for 9, Request/Reply fields are 2 PIM response messages, and set up the multicast of itself
Routing forwarding entry.After first-hop router receives PIM response messages, when establishing the Multicast Routing forwarding entry of itself, group
Multicast data stream is successfully forwarded to the router of recipient from first-hop router, and multicast shortest path tree is successfully established.
In sum, the method that optimization PIM-SM Multicast Routings of the invention are set up so that multicast traffic stream is only jumped in head
On router can on the CPU that send, so as to alleviate the operating pressure of CPU, it is to avoid the catastrophe failure such as protocol state machine time-out
Occur.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (10)
1. a kind of method that optimization PIM-SM Multicast Routings are set up, it is characterised in that self-defined PIM protocol massages, the PIM associations
The version of view message including PIM protocol massages stems, style number, request/acknowledgement field, verification and, the source IP of multicast traffic stream
Address and the group IP address of multicast traffic stream, wherein, by defining the style number of the PIM protocol massages stem by the PIM
Protocol massages are defined as PIM requests/response message, and are according to the request/acknowledgement field definition PIM protocol massages
PIM request messages or PIM response messages；
The method that the optimization PIM-SM Multicast Routings are set up at least is comprised the following steps：
Whether first-hop router sends PIM request messages to most downstream direction, need to set up with the router in hop-by-hop inquiry downstream
Multicast Routing forwarding entry；
If the router of connection recipient needs the multicast traffic stream in PIM request messages, Multicast Routing forwarding entry is set up,
And send PIM response messages toward source direction hop-by-hop after Multicast Routing forwarding entry is successfully established；
Receive whether source IP address that the router of PIM response messages judged in PIM response messages and group IP address are request
The address crossed；If it is Multicast Routing forwarding entry is set up, and continues to send PIM response messages toward source direction；
After first-hop router receives PIM response messages, the Multicast Routing forwarding entry of itself is set up, so far complete multicast
The foundation of forwarding tree.
2. the method that optimization PIM-SM Multicast Routings according to claim 1 are set up, it is characterised in that：Also include：Multicast
The multicast forwarding tree that data flow passes through to establish is forwarded.
3. the method that optimization PIM-SM Multicast Routings according to claim 1 are set up, it is characterised in that：When request/response
When field is 1, the PIM protocol massages are expressed as PIM request messages；When request/acknowledgement field is 2, the PIM agreements report
Text is expressed as PIM response messages.
4. the method that optimization PIM-SM Multicast Routings according to claim 1 are set up, it is characterised in that：Verify and verify
Field includes whole PIM protocol massages stem, source IP address and group IP address.
5. the method that the optimization PIM-SM Multicast Routings described in a kind of application claim 1 are set up is set up in multicast share tree
The method of PIM-SM Multicast Routings, it is characterised in that：Comprise the following steps：
On multicast share tree, first-hop router receives multicast traffic stream, generates and sends PIM logon messages and is route to convergent point
On device, convergent point router judges whether the router in downstream needs the multicast traffic stream；If it is not needed, convergent point router
Stopped registration messages are sent to first-hop router, terminates the forwarding of the multicast traffic stream；
If desired, convergent point router is sent corresponding to the multicast traffic stream toward first-hop router（S, G）Join message；
First-hop router is received（S, G）After joining message, PIM request messages to convergent point router are sent；
After convergent point router receives PIM request messages, stopped registration messages, and past recipient side are sent to first-hop router
To Resealing and send PIM request messages；
PIM request messages along multicast share tree path, the hop-by-hop on the router direction of convergent point router to recipient
Transmission；After the router for connecting recipient receives PIM request messages, parsing PIM request messages obtain source IP address and group IP
Address, and set up the Multicast Routing forwarding entry of itself；
After the Multicast Routing forwarding entry of the router of connection recipient is successfully established, continue toward convergent point router direction hop-by-hop
Send PIM response messages；PIM response messages route in the router of recipient along the path of multicast share tree to convergent point
Hop-by-hop transmission on device direction；The router for connecting recipient sets up Multicast Routing forwarding bar toward convergent point router direction hop-by-hop
Mesh, until convergent point router establishes the Multicast Routing forwarding entry of itself, convergent point router is again toward first-hop router side
PIM response messages are sent to hop-by-hop；
First-hop router receives the PIM response messages that convergent point router sends, and sets up the Multicast Routing forwarding bar of itself
Mesh, so far completes the foundation of multicast share tree.
6. the method that PIM-SM Multicast Routings are set up in multicast share tree according to claim 5, it is characterised in that：Group
The multicast share tree that multicast data stream passes through to establish is forwarded.
7. the method that PIM-SM Multicast Routings are set up in multicast share tree according to claim 5, it is characterised in that：It is first
Hop router is received（S, G）After joining message, when sending PIM request messages to convergent point router, sending again after 1 second should
PIM request messages, to prevent packet loss.
8. the method that the optimization PIM-SM Multicast Routings described in a kind of application claim 1 are set up is built in multicast shortest path tree
The method of vertical PIM-SM Multicast Routings, it is characterised in that：Comprise the following steps：
On multicast shortest path tree, first-hop router receives joining message for downstream, judges whether multicast traffic stream has reception
Person；When there is recipient, first-hop router sends PIM request messages toward recipient direction hop-by-hop, the road until connecting recipient
Received by device；
Connect recipient router receive PIM request messages after, parsing obtain source IP address and group IP address, toward source direction by
Jump and send PIM response messages, and set up the Multicast Routing forwarding entry of itself；After first-hop router receives PIM response messages,
Set up the Multicast Routing forwarding entry of itself.
9. the method that PIM-SM Multicast Routings are set up in multicast shortest path tree according to claim 8, its feature exists
In：On multicast shortest path tree, it is PIM that first-hop router receives joining message for downstream（S, G）Join message or IGMP
Join message.
10. the method that PIM-SM Multicast Routings are set up in multicast shortest path tree according to claim 8, its feature exists
In：The multicast shortest path tree that multicast traffic stream passes through to establish is forwarded.
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| PCT/CN2014/085930 WO2015032337A1 (en) | 2013-09-06 | 2014-09-04 | Method for optimizing pim-sm multicast route establishment |
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| CN103581027B (en) * | 2013-09-06 | 2017-06-16 | 上海斐讯数据通信技术有限公司 | A kind of method that optimization PIM SM Multicast Routings are set up |
| CN108430039B (en) * | 2017-01-20 | 2021-12-14 | 迈普通信技术股份有限公司 | Multicast optimization method, multicast equipment and system |
| CN115632979B (en) * | 2022-12-19 | 2023-03-07 | 成都菁蓉联创科技有限公司 | Communication data forwarding method, system and storage medium |
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2013
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- 2014-09-04 WO PCT/CN2014/085930 patent/WO2015032337A1/en active Application Filing
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| WO2015032337A1 (en) | 2015-03-12 |
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