CN101917351A - Multicasting forwarding method on router and forwarding router thereof - Google Patents
Multicasting forwarding method on router and forwarding router thereof Download PDFInfo
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Abstract
The invention provides a multicasting forwarding method on router within the accuracy of physical port and a forwarding router thereof. The method includes the steps: a, an input interface searches that whether three-level multicasting forwarding list items contain the designated output interface or not, if yes, the step b is executed; if not, forwarding is finished; b, when the output interface is a VLAN interface, VLAN ID corresponding to the VLAN interface is set, and multicasting service message is copied and forwarded; c, a hardware acceleration engine searches that whether two-level multicasting hardware list items contain the designated output physical port, if yes, the multicasting service message is forwarded from the designated output physical interface. The two-level multicasting forwarding is adopted based on the existing three-level multicasting forwarding, so that the accuracy of physical port can be realized when the output interface where multicasting service message arrived is a VLAN interface.
Description
Technical field
The present invention relates to IP multicast service forwarding of data technology, particularly three layers of multicasting technology.
Background technology
On the wide and narrow strip router, router both support software is transmitted, and has hardware acceleration engine (Switching Module) simultaneously to support function of exchange; One existing common Wide Area Network interface has VLAN (VLAN) interface again.
What router platform carried out above is three layers of multicast, carries out multicast service by CPU and transmits.Because increased Switching Module, the physical port on the Switching Module fictionalizes VLAN interface, embodies the characteristic of three layer interfaces.Existing three layers of multicast forwarding implementation method can only know and be forwarded on which interface, and may have a plurality of physical ports on the VLAN interface, if adopt existing realization, can be on these physical ports the broadcasting multicast service message.That is, the multicast forwarding pattern on the existing router is, the multicast service message enters from Wide Area Network interface, when the member of reception is arranged on the VLAN interface, duplicates forwarding from all member's physical ports of VLAN interface correspondence.
Can not be accurate to the problem of physical port when therefore there are three layers of multicast forwarding in prior art; The multicast service message is broadcasted on this VLAN, causes the unnecessary CPU ability burden of bandwidth waste and miscellaneous equipment.
Summary of the invention
Technical problem to be solved by this invention is, multicast forward method and forwarding router on a kind of router that can be accurate to physical port is provided.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be, multicast forward method on the router may further comprise the steps:
A, input interface receive the multicast service message, search the output interface whether three layers of multicast forwarding list item exist appointment, in this way, enter step b; As not, transmit and finish;
The output interface of b, each appointment of circular treatment; When output interface is a VLAN interface, the VLANID of this VLAN interface correspondence is set, duplicate and transmit this multicast service message to the passage between CPU and the hardware acceleration engine;
C, hardware acceleration engine receive the multicast service message from passage and search the output physical port that whether has appointment the Layer 2 Multicast hardware table item, in this way, from the output physical port of appointment the multicast service message are forwarded; As not, abandon this multicast service message, transmit and finish.
On the basis of existing three layers of multicast forwarding, add Layer 2 Multicast and transmit, when making the multicast service message reach output interface to be VLAN interface, can be as accurate as physical port.Only the physical port to the reception member who has of VLAN interface sends the multicast service message, and the physical port that does not receive the member can not received the multicast service message.
Further, working as output interface among the step b is Wide Area Network interface, duplicates and transmits this multicast service message to this Wide Area Network interface.
Concrete, the Wide Area Network interface of router and VLAN interface operation have three layers of multicast routing protocol; Three layers of multicast routing protocol are used to collect the interface information about firms, safeguard three layers of multicast routing table, and three layers of multicast forwarding information are write three layers of multicast forward table;
Operation has Layer 2 Multicast agreement and IGMP snooping (monitoring of the Internet group member management protocol) agreement on each physical port of VLAN interface correspondence, by intercepting IGMP (Internet Group Management Protocol) member report or leave group message, form the IGMPsnooping group record, the Layer 2 Multicast agreement according to IGMP snooping group record safeguard that Layer 2 Multicast transmits, and the Layer 2 Multicast forwarding information is write the Layer 2 Multicast hardware list.
Described three layers of multicast routing protocol are PIM-SM, PIM-DM or DVMRP.
Described three layers of multicast forward table include multicast source IP address, multicast purpose IP address, input interface and output interface tabulation; The Layer 2 Multicast hardware table item includes multicast source IP address, multicast purpose IP address, VLAN ID, output interface tabulation;
The output interface that whether has appointment among the step a according to multicast source IP address, three layers of multicast forwarding list item of multicast purpose IP address search;
Extract among the step c and according to target MAC (Media Access Control) address in the multicast service message and VLAN ID, perhaps, multicast source IP address, multicast group IP address and VLAN ID search the Layer 2 Multicast hardware table item.
Further, after the step a, also comprise before the step b: judge whether the input interface that receives this multicast service message is three layers of fixed input interface of multicast forwarding list item middle finger, in this way, enters step b; As not, abandon this multicast service message, transmit and finish.
Among the step a, during the fixed output interface of three layers of multicast forwarding list item aphalangia, three layers of multicast forwarding module send the cache miss message to three layers of multicast routing protocol, transmit and finish.
In addition, a kind of forwarding router of realizing this method also is provided, comprise Wide Area Network interface, VLAN interface and corresponding a plurality of physical ports, CPU, hardware acceleration engine thereof, described CPU is connected by passage with hardware acceleration engine, Wide Area Network interface, VLAN interface link to each other with CPU, and a plurality of physical ports that VLAN interface is corresponding with it connect; Described CPU includes three layers of multicast forwarding module, includes the Layer 2 Multicast forwarding module in the hardware acceleration engine;
Described three layers of multicast forwarding module are used for searching the output interface whether three layers of multicast forwarding list item exist appointment after input receives the multicast service message; In this way,, the VLAN ID of this VLAN interface correspondence is set, duplicates and transmit this multicast service message to the passage between CPU and the hardware acceleration engine when input interface is a VLAN interface; As not, transmit and finish;
Described Layer 2 Multicast forwarding module after being used for receiving the multicast service message from passage, is searched the output physical port that whether has appointment in the Layer 2 Multicast hardware table item, in this way, from the output physical port of appointment the multicast service message is forwarded; As not, abandon this multicast service message, transmit and finish.
Further, three layers of multicast routing protocol module have been included in Wide Area Network interface and the VLAN interface; Include the Layer 2 Multicast forwarding module in the hardware acceleration engine, include the Layer 2 Multicast protocol module in the physical port;
Described three layers of multicast routing protocol module are used to collect the interface information about firms, safeguard three layers of multicast routing table, and three layers of multicast forwarding information are write three layers of multicast forward table;
Described Layer 2 Multicast protocol module is used for the collection port information about firms, safeguards that Layer 2 Multicast transmits, and the Layer 2 Multicast forwarding information is write the Layer 2 Multicast hardware list.
Further, described three layers of multicast forwarding module also are used for sending the cache miss message to three layers of multicast routing protocol module when the fixed output interface of three layers of multicast forwarding list item aphalangia.
Further, also include IGMP snooping protocol module in the described physical port;
Described IGMP snooping protocol module is used for, and intercepts IGMP member report or leave group message, forms the IGMP snooping group record of physical port, the Layer 2 Multicast protocol module according to IGMP snooping group record safeguard that Layer 2 Multicast transmits.
Further, described three layers of multicast forwarding module are used for duplicating the forwarding multicasting service message to this Wide Area Network interface when the output interface of appointment is Wide Area Network interface.
The invention has the beneficial effects as follows, make that the multicast forwarding on the router can be as accurate as VLAN interface corresponding physical port, conserve bandwidth.
Description of drawings
Fig. 1 is an embodiment router topology schematic diagram;
Fig. 2 is three layers of multicast forwarding flow chart;
Fig. 3 is Layer 2 Multicast forwarding process figure.
Embodiment
The present invention simultaneously in conjunction with three layers of multicast of IP and IP Layer 2 Multicast form respectively soft, hardware multicast is transmitted and transmit control flow.By three layers of multicast of IP, form and safeguard three layers of multicast forward table, record multicast source IP address, multicast purpose IP address, input interface and output interface tabulation.By the IP Layer 2 Multicast, form and safeguard member port tabulation on the particular vlan interface, and above member port list information is written in the Layer 2 Multicast hardware table item in the hardware acceleration engine.
When carrying out the multicast service forwarding, group business stream enters by the Wide Area Network interface of wide and narrow strip router, transmits (three layers of multicast forwarding) through software then, and arriving has on the Wide Area Network interface and VLAN interface that receives the member.If output interface is a Wide Area Network interface, the multicast service message is replicated and is forwarded on the Wide Area Network interface.If output interface is a VLAN interface, VLAN ID then is set, this multicast service message is duplicated on the passage that is forwarded between CPU and the hardware acceleration engine.Hardware acceleration engine extracts VLAN ID and purpose MAC or multicast source IP address, multicast group IP address according to the multicast service message information that arrives from passage.Hardware acceleration engine is searched the Layer 2 Multicast hardware table item again.If this list item exists, hardware acceleration engine is duplicated the multicast service message and is forwarded on each output port; Otherwise, abandon this multicast service message.
The structure chart of wide and narrow strip router such as Fig. 1:
Wide Area Network interface, VLAN interface and corresponding a plurality of physical ports, CPU, hardware acceleration engine thereof, CPU is connected by passage with hardware acceleration engine, Wide Area Network interface, VLAN interface link to each other with CPU, and a plurality of physical ports that VLAN interface is corresponding with it connect; CPU, hardware acceleration engine and passage between the two.CPU is responsible for finishing three layers of multicast software forwarding process, and the multicast data flow of Wide Area Network interface is sent to corresponding Wide Area Network interface, and the group business stream of VLAN output interface is sent to hardware acceleration engine by passage.Hardware acceleration engine is responsible for carrying out Layer 2 Multicast hardware and is transmitted.When hardware acceleration engine when passage is received the multicast service message, extract VLAN ID and corresponding informance, this message duplicated to transmit have on each port that receives the member;
CPU includes three layers of multicast forwarding module, includes the Layer 2 Multicast forwarding module in the hardware acceleration engine; Three layers of multicast routing protocol module have been included in Wide Area Network interface and the VLAN interface; Include the Layer 2 Multicast forwarding module in the hardware acceleration engine, include Layer 2 Multicast protocol module, IGMP snooping protocol module in the physical port;
IGMP snooping protocol module is used for, intercept IGMP member's report or leave group message, form the IGMPsnooping group record of physical port, the Layer 2 Multicast protocol module safeguards that according to IGMP snooping group record (member port tabulation) Layer 2 Multicast transmits;
The Layer 2 Multicast protocol module is used for the collection port information about firms, safeguards that Layer 2 Multicast transmits, and the Layer 2 Multicast forwarding information is write the Layer 2 Multicast hardware list;
The Layer 2 Multicast forwarding module after being used for receiving the multicast service message from passage, is searched the output physical port that whether has appointment in the Layer 2 Multicast hardware table item, in this way, from the output physical port of appointment the multicast service message is forwarded; As not, abandon this multicast service message, transmit and finish;
Three layers of multicast routing protocol module are used to collect the interface information about firms, safeguard three layers of multicast routing table, and three layers of multicast forwarding information are write three layers of multicast forward table;
Three layers of multicast forwarding module are used for searching the output interface whether three layers of multicast forwarding list item exist appointment after input receives the multicast service message; In this way,, the VLAN ID of this VLAN interface correspondence is set, duplicates and transmit this multicast service message to the passage between CPU and the hardware acceleration engine when input interface is a VLAN interface; As not, transmit and finish; When the fixed output interface of three layers of multicast forwarding list item aphalangia, send the cache miss message to three layers of multicast routing protocol module.
As shown in Figure 2, the flow process that three layers of multicast software transmitted once multicast path by, characteristics of Zhuan Faing repeatedly.At first, whether there are three layers of corresponding multicast forwarding list item according to multicast source IP address and multicast group IP address search.If there is no this list item, forwarding module can send " cache miss " message to three layers of multicast routing protocol so.Forwarding process finishes then.Then, whether the input interface of inspection message arrival interface and forwarding-table item appointment is consistent.If inconsistent, abandon this multicast service message, forwarding process finishes.Otherwise, next circular treatment output interface tabulation.If output interface is a Wide Area Network interface, this message duplicated is forwarded on this interface.If output interface is a VLAN interface, VLAN ID (because may there be a plurality of output VLAN interfaces, being provided with VLAN ID, hardware acceleration engine ability differentiated treatment) is set, this message is duplicated on the passage that is forwarded between CPU and the hardware acceleration engine.Receive " cache miss " message of three layers of multicast forwarding modules transmission when three layers of multicast routing protocol after, will write three layers of multicast forwarding list item to three layers of multicast forwarding module according to three layers of multicast routing iinformation.
As shown in Figure 3, the flow process that Layer 2 Multicast hardware is transmitted: after hardware acceleration engine receives the multicast service message from passage, extract the Layer 2 Multicast relevant information, (purpose MAC for example, VLAN ID) or (multicast source IP address, multicast group IP address, VLAN ID), search corresponding hardware forwarding table item.Concrete which kind of situation of supporting will be decided according to the ability of engine.If list item does not exist, abandon this message.Otherwise, the tabulation of circular treatment output port.The multicast service message duplicated be forwarded on the corresponding port.
Concrete scheme is as follows:
The first step, three layers of multicast routing protocol are moved on each Wide Area Network interface of router and VLAN interface.Collect the information about firms on each interface, form three layers of multicast routing table of (*, multicast group IP address) or (multicast source IP address, multicast group IP address) then.
In second step, the Layer 2 Multicast agreement operates on the VLAN of each VLAN interface correspondence.Collect the IGMPsnooping group record on each port; Form member port tabulation then such as (*, multicast group IP address, VLAN ID) and (multicast source IP address, multicast group IP address, VLAN ID).
In the 3rd step, the Layer 2 Multicast agreement comprehensively becomes the Layer 2 Multicast forwarding-table item with the tabulation of the member port on these ports, is written in the hardware table item of hardware acceleration engine.Shape adds the form of (*, multicast group IP address, VLAN ID, output port tabulation) as (purpose MAC, VLAN ID, output port tabulation) or (multicast source IP address, multicast group IP address, VLAN ID, output port tabulation).Specifically will be according to the tenability of hardware acceleration engine.Any multicast source IP address of ' * ' expression coupling.
In the 4th step, when group business stream arrived the wide area interface, three layers of multicast forwarding module were according to multicast source IP address and three layers of multicast forwarding list item of multicast group IP address search.If this list item does not exist, forwarding module sends " cache miss " message to three layers of multicast routing protocol, and forwarding process finishes.And after three layers of multicast routing protocol receive this message, will write three layers of multicast forward table to forwarding module according to the multicast routing iinformation of oneself safeguarding.Shape is as (multicast source IP address, multicast group IP address, input interface, output interface tabulation).Otherwise, represent that three layers of multicast forwarding list item exist.Forwarding module checks whether the input interface of message arrival interface and list item appointment is consistent.If inconsistent, abandon this multicast service message, forwarding process finishes.Otherwise, the tabulation of circular treatment output interface.If output interface is a Wide Area Network interface, the multicast service message duplicated is forwarded on this interface.Otherwise output interface is a VLAN interface, and VLAN ID is set, and this message is duplicated on the passage that is forwarded between CPU and the hardware acceleration engine.
In the 5th step, after hardware acceleration engine was received from the multicast service message in the passage, according to VLAN ID and multicast service stream information, the hardware forwarding table item was searched in target MAC (Media Access Control) address or multicast source IP address and multicast group IP address.If there is not this list item, abandon this message.Otherwise, the tabulation of circular treatment output port.There is being the port that receives the member to duplicate this message of transmission.Do not have the port that receives the member, do not transmit this message.
Claims (11)
1. multicast forward method on the router is characterized in that, may further comprise the steps:
A, input interface receive the multicast service message, search the output interface whether three layers of multicast forwarding list item exist appointment, in this way, enter step b; As not, transmit and finish;
The output interface of b, each appointment of circular treatment; When output interface is a VLAN interface, the VLANID of this VLAN interface correspondence is set, duplicate and transmit this multicast service message to the passage between CPU and the hardware acceleration engine;
C, hardware acceleration engine receive the multicast service message from passage and search the output physical port that whether has appointment the Layer 2 Multicast hardware table item, in this way, from the output physical port of appointment the multicast service message are forwarded; As not, abandon this multicast service message, transmit and finish.
2. multicast forward method on the router according to claim 1 is characterized in that, among the step b when output interface be Wide Area Network interface, duplicate and transmit this multicast service message to this Wide Area Network interface.
3. as multicast forward method on the router as described in the claim 2, it is characterized in that the Wide Area Network interface of router and VLAN interface operation have three layers of multicast routing protocol; Three layers of multicast routing protocol are used to collect the interface information about firms, safeguard three layers of multicast routing table, and three layers of multicast forwarding information are write three layers of multicast forward table;
Operation has Layer 2 Multicast agreement and IGMP snooping agreement on each physical port of VLAN interface correspondence, by intercepting IGMP member's report or leave group message, form IGMP snooping group record, the Layer 2 Multicast agreement according to IGMP snooping group record safeguard that Layer 2 Multicast transmits, and the Layer 2 Multicast forwarding information is write the Layer 2 Multicast hardware list.
4. multicast forward method on the router according to claim 1 is characterized in that described three layers of multicast forward table include multicast source IP address, multicast purpose IP address, input interface and output interface tabulation; The Layer 2 Multicast hardware table item includes multicast source IP address, multicast purpose IP address, VLAN ID, output interface tabulation;
The output interface that whether has appointment among the step a according to multicast source IP address, three layers of multicast forwarding list item of multicast purpose IP address search;
Extract among the step c and according to target MAC (Media Access Control) address in the multicast service message and VLAN ID, perhaps, multicast source IP address, multicast group IP address and VLAN ID search the Layer 2 Multicast hardware table item.
5. multicast forward method on the router according to claim 1, it is characterized in that, after the step a, also comprise before the step b: judge whether the input interface that receives this multicast service message is three layers of fixed input interface of multicast forwarding list item middle finger, in this way, enter step b; As not, abandon this multicast service message, transmit and finish.
6. multicast forward method on the router according to claim 1 is characterized in that, among the step a, during the fixed output interface of three layers of multicast forwarding list item aphalangia, three layers of multicast forwarding module send the cache miss message to three layers of multicast routing protocol, transmit and finish.
7. forwarding router, comprise Wide Area Network interface, VLAN interface and corresponding a plurality of physical ports, CPU, hardware acceleration engine thereof, described CPU is connected by passage with hardware acceleration engine, Wide Area Network interface, VLAN interface link to each other with CPU, and a plurality of physical ports that VLAN interface is corresponding with it connect; It is characterized in that described CPU includes three layers of multicast forwarding module, includes the Layer 2 Multicast forwarding module in the hardware acceleration engine;
Described three layers of multicast forwarding module are used for searching the output interface whether three layers of multicast forwarding list item exist appointment after input receives the multicast service message; In this way,, the VLAN ID of this VLAN interface correspondence is set, duplicates and transmit this multicast service message to the passage between CPU and the hardware acceleration engine when input interface is a VLAN interface; As not, transmit and finish;
Described Layer 2 Multicast forwarding module after being used for receiving the multicast service message from passage, is searched the output physical port that whether has appointment in the Layer 2 Multicast hardware table item, in this way, from the output physical port of appointment the multicast service message is forwarded; As not, abandon this multicast service message, transmit and finish.
8. as forwarding router as described in the claim 7, it is characterized in that described three layers of multicast forwarding module are used for duplicating the forwarding multicasting service message to this Wide Area Network interface when the output interface of appointment is Wide Area Network interface.
9. as forwarding router as described in the claim 7, it is characterized in that, included three layers of multicast routing protocol module in Wide Area Network interface and the VLAN interface; Include the Layer 2 Multicast forwarding module in the hardware acceleration engine, include the Layer 2 Multicast protocol module in the physical port;
Described three layers of multicast routing protocol module are used to collect the interface information about firms, safeguard three layers of multicast routing table, and three layers of multicast forwarding information are write three layers of multicast forward table;
Described Layer 2 Multicast protocol module is used for the collection port information about firms, safeguards that Layer 2 Multicast transmits, and the Layer 2 Multicast forwarding information is write the Layer 2 Multicast hardware list.
10. as forwarding router as described in the claim 9, it is characterized in that described three layers of multicast forwarding module also are used for sending the cache miss message to three layers of multicast routing protocol module when the fixed output interface of three layers of multicast forwarding list item aphalangia.
11. as forwarding router as described in the claim 7,8 or 9, it is characterized in that, also include the IGMPsnooping protocol module in the described physical port; Described IGMP snooping protocol module is used for, and intercepts IGMP member report or leave group message, forms the IGMP snooping group record of physical port, the Layer 2 Multicast protocol module according to IGMP snooping group record safeguard that Layer 2 Multicast transmits.
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Application publication date: 20101215 |