CN102185785A - Layer 2 forwarding chip and realization method thereof - Google Patents
Layer 2 forwarding chip and realization method thereof Download PDFInfo
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- CN102185785A CN102185785A CN2011101511833A CN201110151183A CN102185785A CN 102185785 A CN102185785 A CN 102185785A CN 2011101511833 A CN2011101511833 A CN 2011101511833A CN 201110151183 A CN201110151183 A CN 201110151183A CN 102185785 A CN102185785 A CN 102185785A
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Abstract
The invention discloses a layer 2 forwarding chip and a realization method thereof. The method comprises the following steps of: after an Internet group management protocol version 3 (IGMPv3) snooping addition message is received from a Host, a routed port transmits an input direction defined access control list (ACL), performs filtration based on (multicast source, multicast group and virtual global area network) (S, G, V), and reorients the filtered (S, G, V) to a reflector port; and the reflector port forwards a layer 2 multicast forwarding table based on the filtered (S, G, V). By the layer 2 forwarding chip and the realization method thereof provided by the invention, (S, G, V)-based table entry forwarding can be performed, and an IGMPv3 function is realized.
Description
Technical field
The present invention relates to message retransmission technique field, particularly a kind of two layers of forwarding chip and its implementation.
Background technology
Internet group management protocol snooping (IGMPv3) has increased the filtered model at multicast source, makes main frame when adding certain multicast group (G), can explicitly call for reception or the refusal multicast information from certain specific multicast source (S).Corresponding, IGMPv3 also requires to make main frame when adding certain G when carrying out the Layer 2 Multicast forwarding, can explicitly call for reception or the refusal multicast information from certain specific S.
Therefore, when doing the Layer 2 Multicast forwarding, require the forwarding chip of switch can support based on (S is G) with (*, G) Xiang forwarding, that is: receive what the user sent at certain VLAN (Vlan) when switch, use comprises (INCLUDE) pattern, when adding the IGMPv3 message of certain G that source S sends, needs to support based on (S, G, V) forwarding of list item; Receive the user when switch and send, use not comprise (EXCLUDE) pattern, add except the S of source, during the IGMPv3 message of certain G that send in all other sources at certain Vlan, need to support based on (V) list item abandons for S, G, and based on (*, G, V) forwarding of list item.
Yet, have only the exchange chip of supporting that three layers of multicast hardware are transmitted at present, just support the IGMPv3 function, the forwarding chip that uses for Layer 2 switch is not support three layers of forwarding.That is to say, when carrying out the Layer 2 Multicast forwarding, only support forwarding, also just be equivalent to only support based on (* based on the purpose multicast address, G, the V) forwarding of list item can't be carried out the differentiation of source IP address, can not carry out based on (S, G, the V) forwarding of list item also just can't realize the IGMPv3 function.
Summary of the invention
In view of this, the invention provides a kind of two layers of forwarding chip, can carry out based on (V) forwarding of list item realizes the IGMPv3 function for S, G.
The present invention also provides a kind of implementation method of two layers of forwarding chip, can carry out based on (V) forwarding of list item realizes the IGMPv3 function for S, G.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of two layers of forwarding chip, these two layers of forwarding chips comprise: first issues unit and second issues the unit, wherein,
Described first issues the unit, is used for the message that will receive and issues Inbound definition access list ACL at the route mouth, filter based on (multicast source S, multicast group G, VLAN V), and with after the described filtration (S, G V) are redirected to reflex port;
Described second issues the unit, is used for that (V) message after filtering issues Layer 2 Multicast and transmits, and broadcasts to transmit according to described two layers message is carried out multicast forwarding for S, G to issuing the unit by first.
Described first issues the unit comprises: be redirected subelement and revise subelement, wherein,
Described redirected subelement, be used for the message that will receive by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Described modification subelement is used for and will be revised as the VLAN that the VLAN resource also is not used by being redirected the VLAN identify label VLAN ID that subelement is redirected to the message of reflex port, makes all corresponding different VLAN of each S.
These two layers of forwarding chips also comprise: revise the unit, be used for issuing at main frame Host mouth the ACL of outgoing direction.
Described modification unit also is used for revising the described second VLAN ID that issues the message that VLAN ID that Layer 2 Multicast that the unit issues transmits receives for the route mouth.
Described Layer 2 Multicast is transmitted and is comprised that S, G, V and Layer 2 Multicast transmit outbound port, comprises the multicast message of S, G, V, transmits outbound port by this Layer 2 Multicast and transmits.
Described first issues the unit, also is used for issuing a Layer 2 Multicast at the initial VLAN of message and transmits, and adds the Host mouth to member port that this Layer 2 Multicast is transmitted.
Described Layer 2 Multicast is transmitted and is comprised S, G, V and dead end mouth, and the multicast message that comprises S, G, V is dropped, and the multicast message of other S is by multicast forwarding.
A kind of implementation method of two layers of forwarding chip, this method comprises:
After receiving message, issue Inbound definition access list ACL, filter based on (multicast source S, multicast group G, VLAN V) at the route mouth, and with after the described filtration (S, G V) are redirected to reflex port;
Reflex port based on after filtering (S, G V) issue Layer 2 Multicast and transmit.
Described receive message after, issue Inbound ACL at the route mouth, based on (S, G V) filter, and with after the described filtration (S, G V) are redirected to reflex port and comprise:
With the message that receives by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Reflex port is revised as a VLAN who also is not used in the VLAN resource with the VLAN identify label VLAN ID of message, makes all corresponding different VLAN of each S.
This method further comprises: main frame Host mouth issues the ACL of outgoing direction.
Described Host mouth issues after the ACL of outgoing direction, and this method also comprises: the VLAN ID that revises the message that the VLAN ID of described Layer 2 Multicast in transmitting receive for the route mouth.
Described Layer 2 Multicast is transmitted and is comprised that S, G, V and Layer 2 Multicast transmit outbound port, comprises the multicast message of S, G, V, transmits outbound port by this Layer 2 Multicast and transmits.
Described with the (S after the described filtration, G, V) be redirected to after the reflex port, reflex port is based on (the S after filtering, G, V) issue before Layer 2 Multicast transmits, this method also comprises: issue a Layer 2 Multicast at the initial VLAN of message and transmit, add the Host mouth to member port that this Layer 2 Multicast is transmitted.
Described Layer 2 Multicast is transmitted and is comprised S, G, V and dead end mouth, and the multicast message that comprises S, G, V is dropped, and the multicast message of other S is by multicast forwarding.
In sum, two layers of forwarding chip of the present invention and its implementation, be by the message that will receive carry out based on (S, G, V) filter after, and then according to after filtering (S, G V) issue Layer 2 Multicast and transmit realization to the multicast forwarding of message.Because being the VLAN combination during S is transmitted with Layer 2 Multicast, the inventive method carries out multicast forwarding when carrying out multicast forwarding, thus can be according to VLAN with (G V) finishes based on (forwarding V) realizes the IGMPv3 function for S, G.
Description of drawings
Fig. 1 is the structural representation of two layers of forwarding chip of the embodiment of the invention;
Fig. 2 is the workflow diagram of two layers of forwarding chip implementation method of the present invention embodiment.
Embodiment
The specific implementation of scheme of the present invention comprises:
After receiving message, issue Inbound ACL at the route mouth, based on (S, G V) filter, and with after the described filtration (S, G V) are redirected to reflex port; Reflex port based on after filtering (S, G V) issue Layer 2 Multicast and transmit.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment one
The situation that it is the INCLUDE pattern that present embodiment is applied to two layers of forwarding chip, Fig. 1 has provided the structure of two layers of forwarding chip that present embodiment adopted.As shown in Figure 1, these two layers of forwarding chips comprise: first issues unit 11 and second issues unit 12, wherein,
Described first issues unit 11, and the message that is used for receiving issues Inbound ACL at the route mouth, based on (S, G V) filter, and with after the described filtration (S, G V) are redirected to reflex port.
Further, described first issues unit 11 also can comprise redirected subelement 111 and revise subelement 112, wherein,
Described redirected subelement 111, be used for the message that will receive by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Described modification subelement 112 is used for and will be revised as the VLAN that the VLAN resource also is not used by being redirected the VLAN ID that subelement 111 is redirected to the message of reflex port, makes all corresponding different VLAN of each S.
Described second issues unit 12, is used for issuing Layer 2 Multicast and transmitting revising subelement 112 amended VLAN, and transmits according to this Layer 2 Multicast message is carried out multicast forwarding.
In the present embodiment, described Layer 2 Multicast is transmitted and is comprised that S, G, V and Layer 2 Multicast transmit outbound port, the multicast message that only comprises S, G, V, could transmit the outbound port forwarding multicasting message by this Layer 2 Multicast, the multicast message of other S can not be transmitted the outbound port forwarding multicasting message by this Layer 2 Multicast.
Further, these two layers of forwarding chips also can comprise revises unit 13, is used for issuing at the Host mouth ACL of outgoing direction, revises the described second VLAN ID that issues the message that Layer 2 Multicast that unit 12 the issues VLANID in transmitting receives for the route mouth.
Need to prove, when Host requires to receive the message of untag, revise unit 13 and need not to revise the described second VLAN ID that issues the message that Layer 2 Multicast that unit 12 the issues VLAN ID in transmitting receives for the route mouth, directly the VLAN ID in Host mouth Layer 2 Multicast is transmitted is set to untag and gets final product.
So far, two layers of forwarding chip that present embodiment adopted have promptly been obtained.
Based on above-mentioned two layers of forwarding chip, Fig. 2 has provided the workflow diagram of two layers of forwarding chip implementation method that present embodiment adopted.As shown in Figure 2, this flow process comprises:
Step 201: receive after IGMPV3 that Host sends joins message, issue Inbound ACL by the route mouth, based on (S, G V) filter, and after will filtering (S, G V) are redirected to reflex port.
Need to prove, before carrying out this step, upper-layer protocol can issue Layer 2 Multicast to two layers of forwarding chip and transmit, described Layer 2 Multicast is transmitted and is comprised that S, G, V and Layer 2 Multicast transmit outbound port, the multicast message that only comprises S, G, V, could transmit the outbound port forwarding multicasting message by this Layer 2 Multicast, the multicast message of other S can not be transmitted the outbound port forwarding multicasting message by this Layer 2 Multicast.
Also it should be noted that, in this step, based on (S, G, V) the VLAN ID that filters the message be about to receive is revised as a VLAN who also is not used in the VLAN resource, makes all corresponding different VLAN of each S, and described reflex port is an internal loopback port.
Step 202: reflex port based on after filtering (S, G V) issue Layer 2 Multicast and transmit.
After reflex port is revised as a VLAN who also is not used in the VLAN resource with the VLAN ID of message, must be in Layer 2 Multicast is transmitted to an item should be arranged, because corresponding VLAN ID of S, at this moment, can think an item in the pairing two-layer retransmitting table of S of this message, also promptly can realize (S, G, V) message forwarding.
Step 203:Host mouth issues the ACL of outgoing direction.
When Host require to receive the message of tag, the VLAN ID in also needing Layer 2 Multicast transmitted was revised as the VLAN ID of the message that the route mouth receives; When Host require to receive the message of untag, need not to revise the VLAN ID of the message that the VLAN ID of Layer 2 Multicast in transmitting receive for the route mouth, only need a VLAN ID in Host mouth Layer 2 Multicast is transmitted to be set to untag and get final product.
So far, promptly finished the whole workflow of two layers of forwarding chip implementation method that present embodiment adopted.
Embodiment two
The situation that it is the EXCLUDE pattern that present embodiment is applied to two layers of forwarding chip, wherein, the structure of two layers of forwarding chip that adopted still can be referring to Fig. 1, and as shown in Figure 1, these two layers of forwarding chips comprise: first issues unit 11 and second issues unit 12, wherein,
Described first issues unit 11, and the message that is used for receiving issues Inbound ACL at the route mouth, based on (S, G, V) filter, (S, the G after the described filtration, V) be redirected to reflex port, and issue a Layer 2 Multicast at the initial VLAN of message and transmit, add the Host mouth to member port that this Layer 2 Multicast is transmitted, be used for removing (the S of EXCLUDE pattern, G, V) forwarding of other multicast group in addition.
Further, described first issues unit 11 also can comprise redirected subelement 111 and revise subelement 112, wherein,
Described redirected subelement 111, the message that the message that is used for receiving receives by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Described modification subelement 112, be used for and be revised as the VLAN that the VLAN resource also is not used by the VLAN ID that redirected subelement 111 is redirected to the message of reflex port, make all corresponding different VLAN of each S, and issue a Layer 2 Multicast at the initial VLAN of message and transmit, add the Host mouth to member port that this Layer 2 Multicast is transmitted, be used for removing (S, G, V) forwarding of other multicast group in addition of EXCLUDE pattern.
Described second issues unit 12, is used for issuing Layer 2 Multicast at modification subelement 112 amended VLAN and transmits, and according to this multicast forward table message is carried out multicast forwarding.
In the present embodiment, described Layer 2 Multicast is transmitted and is comprised S, G, V and dead end mouth, comprises the multicast message of S, G, V, and message can be dropped, and the multicast message of other S then can be by multicast forwarding.
Further, these two layers of forwarding chips also can comprise revises unit 13, is used for issuing at the Host mouth ACL of outgoing direction, and revises the described second VLAN ID that issues the message that Layer 2 Multicast that unit 12 the issues VLAN ID in transmitting receives for the route mouth.
Need to prove, when Host requires to receive the message of untag, revise unit 13 and need not to revise the described second VLAN ID that issues the message that Layer 2 Multicast that unit 12 the issues VLAN ID in transmitting receives for the route mouth, directly the VLAN ID in Host mouth Layer 2 Multicast is transmitted is set to untag and gets final product.
So far, two layers of forwarding chip that present embodiment adopted have promptly been obtained.From foregoing description as can be seen, two layers of forwarding chip of present embodiment and embodiment one difference only are, second issues whether Layer 2 Multicast that unit 12 the issues outbound port in transmitting is the dead end mouth, and for two layers of forwarding chip of INCLUDE pattern, outbound port is not the dead end mouth; For two layers of forwarding chip of EXCLUDE pattern, outbound port is the dead end mouth.
Based on the described two layers of forwarding chip of present embodiment, the workflow of two layers of forwarding chip implementation method that present embodiment adopted also can be referring to Fig. 2.As shown in Figure 2, this flow process comprises:
Step 201: receive after IGMPV3 that Host sends joins message, issue Inbound ACL by the route mouth, based on (S, G, V) filter, and (S, G after will filtering, V) be redirected to reflex port, and issue a Layer 2 Multicast at the initial VLAN of message and transmit, add the Host mouth to member port that this Layer 2 Multicast is transmitted, be used for removing (the S of EXCLUDE pattern, G, V) forwarding of other multicast group in addition.
Need to prove, before carrying out this step, upper-layer protocol can issue Layer 2 Multicast to two layers of forwarding chip and transmit, and described Layer 2 Multicast is transmitted and comprised S, G, V and dead end mouth, the multicast message that comprises S, G, V is dropped, and the multicast message of other S then is carried out multicast message and transmits.
It should be noted that also in this step, reflex port is based on (S, G, V) the VLAN ID that filters the message be about to receive is revised as a VLAN who also is not used in the VLAN resource, makes all corresponding different VLAN of each S, and described reflex port is an internal loopback port.
Step 202: reflex port based on after filtering (S, G V) issue Layer 2 Multicast and transmit.
After reflex port is revised as a VLAN who also is not used in the VLAN resource with the VLAN ID of message, must be in Layer 2 Multicast is transmitted to an item should be arranged, because corresponding VLAN ID of S, at this moment, can think an item in the pairing two-layer retransmitting table of S of this message, also promptly can realize (S, G, V) abandoning of message is to the message forwarding of other S.
Step 203:Host mouth issues the ACL of outgoing direction.
When Host require to receive the message of tag, the VLAN ID in also needing Layer 2 Multicast transmitted was revised as the VLAN ID of the message that the route mouth receives; When Host require to receive the message of untag, need not to revise the VLAN ID of the message that the VLAN ID of Layer 2 Multicast in transmitting receive for the route mouth, only need a VLAN ID in Host mouth Layer 2 Multicast is transmitted to be set to untag and get final product.
So far, promptly finished the whole workflow of two layers of forwarding chip implementation method that present embodiment adopted.
By above-mentioned analysis as can be seen, present embodiment is that with embodiment one difference the outbound port of two-layer retransmitting table is the dead end mouth in the present embodiment, thereby what realize is to (S, G, V) abandoning of message, and to the multicast forwarding of the message of other S; And the outbound port of two-layer retransmitting table is not the dead end mouth among the embodiment one, realization be to (S, G, the V) multicast forwarding of message, and abandoning to the message of other S.
In a word, two layers of forwarding chip of the present invention and its implementation, be by the message that will receive carry out based on (S, G, V) filter after, and then according to after filtering (S, G V) issue Layer 2 Multicast and transmit realization to the multicast forwarding of message.Because being the VLAN combination during S is transmitted with Layer 2 Multicast, the inventive method carries out multicast forwarding when carrying out multicast forwarding, thus can be according to VLAN with (G V) finishes based on (forwarding V) realizes the IGMPv3 function for S, G.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (14)
1. two layers of forwarding chip is characterized in that, these two layers of forwarding chips comprise: first issues unit and second issues the unit, wherein,
Described first issues the unit, is used for the message that will receive and issues Inbound definition access list ACL at the route mouth, filter based on (multicast source S, multicast group G, VLAN V), and with after the described filtration (S, G V) are redirected to reflex port;
Described second issues the unit, is used for that (V) message after filtering issues Layer 2 Multicast and transmits, and broadcasts to transmit according to described two layers message is carried out multicast forwarding for S, G to issuing the unit by first.
2. two layers of forwarding chip according to claim 1 is characterized in that, described first issues the unit comprises: be redirected subelement and revise subelement, wherein,
Described redirected subelement, be used for the message that will receive by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Described modification subelement is used for and will be revised as the VLAN that the VLAN resource also is not used by being redirected the VLAN identify label VLAN ID that subelement is redirected to the message of reflex port, makes all corresponding different VLAN of each S.
3. two layers of forwarding chip according to claim 2 is characterized in that, these two layers of forwarding chips also comprise: revise the unit, be used for issuing at main frame Host mouth the ACL of outgoing direction.
4. two layers of forwarding chip according to claim 3 is characterized in that, described modification unit also is used for revising the described second VLAN ID that issues the message that VLAN ID that Layer 2 Multicast that the unit issues transmits receives for the route mouth.
5. two layers of forwarding chip according to claim 4 is characterized in that, described Layer 2 Multicast is transmitted and comprised that S, G, V and Layer 2 Multicast transmit outbound port, comprises the multicast message of S, G, V, transmit outbound port by this Layer 2 Multicast and transmit.
6. forwarding chip according to claim 4 is characterized in that, described first issues the unit, also is used for issuing a Layer 2 Multicast at the initial VLAN of message and transmits, and adds the Host mouth to member port that this Layer 2 Multicast is transmitted.
7. two layers of forwarding chip according to claim 6 is characterized in that, described Layer 2 Multicast is transmitted and comprised S, G, V and dead end mouth, and the multicast message that comprises S, G, V is dropped, and the multicast message of other S is by multicast forwarding.
8. the implementation method of two layers of forwarding chip is characterized in that, this method comprises:
After receiving message, issue Inbound definition access list ACL, filter based on (multicast source S, multicast group G, VLAN V) at the route mouth, and with after the described filtration (S, G V) are redirected to reflex port;
Reflex port based on after filtering (S, G V) issue Layer 2 Multicast and transmit.
9. method according to claim 8 is characterized in that, described receive message after, issue Inbound ACL at the route mouth, based on (S, G V) filter, and with after the described filtration (S, G V) are redirected to reflex port and comprise:
With the message that receives by the route mouth based on (S, G V) filter, with after the described filtration (S, G V) are redirected to reflex port, and described reflex port is an internal loopback port;
Reflex port is revised as a VLAN who also is not used in the VLAN resource with the VLAN identify label VLAN ID of message, makes all corresponding different VLAN of each S.
10. method according to claim 9 is characterized in that, this method further comprises: main frame Host mouth issues the ACL of outgoing direction.
11. method according to claim 10 is characterized in that, described Host mouth issues after the ACL of outgoing direction, and this method also comprises: the VLAN ID that revises the message that the VLAN ID of described Layer 2 Multicast in transmitting receive for the route mouth.
12. method according to claim 11 is characterized in that, described Layer 2 Multicast is transmitted and is comprised that S, G, V and Layer 2 Multicast transmit outbound port, comprises the multicast message of S, G, V, transmits outbound port by this Layer 2 Multicast and transmits.
13. method according to claim 11, it is characterized in that, described with the (S after the described filtration, G V) is redirected to after the reflex port, and reflex port is based on (the S after filtering, G, V) issue before Layer 2 Multicast transmits, this method also comprises: issue a Layer 2 Multicast at the initial VLAN of message and transmit, add the Host mouth to member port that this Layer 2 Multicast is transmitted.
14. method according to claim 13 is characterized in that, described Layer 2 Multicast is transmitted and is comprised S, G, V and dead end mouth, and the multicast message that comprises S, G, V is dropped, and the multicast message of other S is by multicast forwarding.
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Application publication date: 20110914 |