CN113472656B - Two-layer switching equipment and method for forwarding multicast data message - Google Patents
Two-layer switching equipment and method for forwarding multicast data message Download PDFInfo
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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Abstract
The application provides a two-layer switching device and a method for forwarding multicast data messages. The method comprises the following steps: setting a multicast replication table item matched with the multicast group address of the multicast group; taking the port of the router port of the multicast group and the VLAN identification as the router port replication link information to be added into the multicast replication list item; the ports of the multicast group members of different VLANs and the VLAN identifications are used as member port replication chain information to be added into a multicast replication list item; receiving a two-layer multicast data message; searching a multicast replication table item according to the multicast group address of the two-layer multicast data message; copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router copy link information of the multicast copy table item, and sending the two-layer multicast data message through the port of the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
Description
Technical Field
The present application relates to multicast technologies, and in particular, to a two-layer switching device and a method for forwarding multicast data packets thereof.
Background
The multicast VLAN (Virtual Local Area Network) technology realizes the cross-VLAN multicast data replication and distribution on a two-layer switching device. After the two-layer switching device enables the multicast VLAN, the three-layer routing device sends a multicast data message to the two-layer switching device in the multicast VLAN, and a copied multicast data message does not need to be sent to the VLAN where each multicast group member is located. For example, a plurality of multicast group members joining the same multicast group are located in different VLANs, the multicast group members must join a common multicast VLAN, each multicast group member sends a two-layer multicast protocol message in the multicast VLAN, after the three-layer routing device sends a multicast data message to the two-layer switching device in the multicast VLAN, the two-layer switching device sends the multicast data message in each VLAN where each multicast group member is located in a duplication manner.
However, the limitation of the multicast VLAN technology is that it is mainly suitable for a three-layer router to forward a received three-layer multicast data packet from bottom to top, and if a multicast source is accessed by a two-layer device, the two-layer device must forward the received two-layer multicast data packet to the three-layer routing device from bottom to top, and then forward the three-layer multicast data packet and then receive the multicast data packet sent by the three-layer routing device in the multicast VLAN from top to bottom, resulting in that the bandwidth of the forwarding path in the network is occupied by the multicast packet of the same multicast group data stream. When such multicast sources in the network increase, bandwidth for forwarding packets of other services in the network may be affected.
Disclosure of Invention
The present application aims to provide a two-layer switching device and a method for forwarding multicast data packets thereof, so that the two-layer switching device does not need to send a received two-layer multicast data packet multicast VLAN to a three-layer routing device for cross-VLAN forwarding.
In order to achieve the above object, the present application provides a method for forwarding a multicast data packet by a two-layer switching device, where the method includes: setting a multicast replication table item matched with the multicast group address of the multicast group; taking the port of the router port of the multicast group and the VLAN identification as the replication link information of the router port and adding the replication link information into the multicast replication list item; the ports of the multicast group members of different VLANs and the VLAN identifications are taken as member port replication chain information to be added into the multicast replication list item; receiving a two-layer multicast data message from a multicast source of a multicast group; searching a multicast replication table item according to the multicast group address of the two-layer multicast data message; copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router copy link information of the multicast copy table item, and sending the two-layer multicast data message through the port of the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
To achieve the above object, the present application also provides a two-layer switching device, including: the setting module is used for setting a multicast replication table item matched with the multicast group address of the multicast group; the table item module is used for adding a port of a router port of the multicast group and a Virtual Local Area Network (VLAN) identifier into a multicast replication table item as router port replication chain information; the ports of the multicast group members of different VLANs and the VLAN identifications are used as member port replication chain information to be added into a multicast replication list item; the receiving module receives a two-layer multicast data message from a multicast source of a multicast group; the multicast forwarding module finds a multicast replication item according to the multicast group address of the two-layer multicast data message; copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router copy link information of the multicast copy table item, and sending the two-layer multicast data message through the port of the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
The method and the device have the advantages that the two-layer switching device sends the two-layer multicast data message to multicast members in different VLANs and to the router port according to the copy chain information in the multicast list items after receiving the two-layer multicast data message, the received two-layer multicast data message does not need to be sent to the three-layer router device firstly and then the two-layer multicast data message copied by the three-layer router device is received through the multicast VLAN, and the network bandwidth is prevented from being repeatedly occupied by two-layer service flows of the same multicast group.
Drawings
Fig. 1 is a flowchart of an embodiment of forwarding a multicast data packet by a layer two switch device according to the present application;
fig. 2A-2C are schematic diagrams of embodiments of forwarding a multicast data packet by a layer two switch device according to the present application;
fig. 3 is a schematic diagram of an embodiment of a two-layer switching apparatus of the present application.
Detailed Description
A detailed description will be given of a number of examples shown in a number of figures. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the examples.
The term "including" as that term is used is meant to include, but is not limited to; the term "comprising" means including but not limited to; the terms "above," "within," and "below" are inclusive of the instant numbers; the terms "greater than" and "less than" mean that the number is not included. The term "based on" means based on at least a portion thereof.
Fig. 1 is an embodiment of forwarding a multicast data packet by a layer two switch device according to the present application, including the following steps:
102, using the port of the router port of the multicast group and the VLAN identification of the virtual local area network as the replication link information of the router port to be added into the multicast replication list item;
103, adding the port of the multicast group member of different VLANs and the VLAN identification as member port replication chain information into a multicast replication list item;
The method and the device have the advantages that the two-layer switching device sends the two-layer multicast data message to multicast members in different VLANs and to the router port according to the copy chain information in the multicast list items after receiving the two-layer multicast data message, the received two-layer multicast data message does not need to be sent to the three-layer router device firstly and then the two-layer multicast data message copied by the three-layer router device is received through the multicast VLAN, and the network bandwidth is prevented from being repeatedly occupied by two-layer service flows of the same multicast group.
Fig. 2A-2C are schematic diagrams of embodiments of forwarding a multicast data packet by a layer two switch device according to the present application. In fig. 2A, the terminal 21 is located in VLAN0, the terminal 22 is located in VLAN1, the multicast source of the multicast group G1 is located in VLAN2, and the two-layer switching device 23 and the three-layer routing device are connected in VLAN 3. Port P3 of the layer two switching device 23 in VLAN3 is a router port.
The two-layer switching device 23 sets a multicast table entry (, G1,) and adds the router port duplicated chain information (P3, VLAN 3).
When the multicast source of the multicast group G1 sends a two-layer multicast data packet in the VLAN2, the two-layer switching device 23 receives the two-layer multicast data packet 201 through the port P4 of the VLAN2, finds the multicast entry (×, G1, > { (P3, VLAN 3) } according to the multicast group address G1 of the two-layer multicast packet 201, copies one two-layer multicast data packet 202 for the VLAN3 to which the router port P3 belongs, and sends the two-layer multicast data packet to the three-layer routing device 24 through the port P3 of the router port. The third layer routing device 24 may encapsulate the received second layer multicast packet 202 into a third layer multicast packet based on the PIM protocol packet and send the third layer multicast packet to the RP server.
In fig. 2A, when the two-layer switching device 23 receives the IGMP join packet 203 from the terminal 21, the port P1 receiving the multicast group join packet 203 and the VLAN0 belonging to the multicast group join packet are used as the member port replication link information of the multicast group members, and a multicast replication entry (×, G1, ×) > { (P3, VLAN 3), (P1, VLAN 0) } is added.
In fig. 2A, when the two-layer switching device 23 receives the IGMP join packet 204 from the terminal 22, the port P2 receiving the multicast group join packet 204 and the belonging VLAN1 are used as member port replication link information of multicast group members, and a multicast replication entry (× G1, > { (P3, VLAN 3), (P1, VLAN 0), (P2, VLAN 1) } is added.
In fig. 2A, when the multicast source of the multicast group G1 sends the two-layer multicast data packet again in the VLAN2, the two-layer switching device 23 receives the two-layer multicast data packet 201 through the port P4 of the VLAN2, finds out the multicast entry (± G1, > { (P3, VLAN 3), (P1, VLAN 0), (P2, VLAN 1) } according to the multicast group address G1 of the two-layer multicast packet 201, copies one two-layer multicast data packet 202 for the VLAN3 to which the router port P3 belongs, copies one two-layer multicast data packet 205 for the VLAN0 to which the multicast group member terminal 21 belongs, copies one two-layer multicast data packet 206 for the VLAN1 to which the multicast group member terminal 22 belongs, and sends the two-layer multicast data packet 202 to the three-layer routing device 24 through the port P3 of the router port; the two-layer multicast data packet 205 is sent to the multicast group member terminal 21 through the port P1, and the two-layer multicast data packet 206 is sent to the multicast group member terminal 22 through the port P2. The triple-layer routing device 24 may encapsulate the received double-layer multicast packet 202 into a triple-layer multicast packet based on a PIM protocol packet and send the triple-layer multicast packet to an RP (rendezvous point) server.
In fig. 2B, the two-layer switch device receives the IGMP query message 207 of the multicast group G1 through the port P3 of the router port, and finds the multicast table entry (×, G1) - > { (P3, VLAN 3), (P1, VLAN 0), (P2, VLAN 1) } according to the multicast group address G1. The two-layer switching device 23 duplicates an IGMP query packet 208 of the multicast group G1 for the VLAN0 to which the multicast group member terminal 21 belongs, duplicates an IGMP query packet 209 of the multicast group G1 for the VLAN1 to which the multicast group member terminal 22 belongs, sends the IGMP query packet 208 of the multicast group G1 to the multicast group member terminal 21 through the port P1, and sends the IGMP query packet 209 of the multicast group G1 to the multicast group member terminal 22 through the port P2.
In fig. 2B, when receiving the IGMP query message 208 of the multicast group G2, the terminal 21 sends an IGMP join message 203 of the multicast group G1 to the two-layer switching device 23, and updates the aging time of the port P1 corresponding to the multicast group join message 203 and the member port replication chain information (P1, VLAN 0) corresponding to the VLAN0 in the multicast replication table entry (— G1').
In fig. 2B, if the terminal 22 fails, it does not respond to the IGMP query message of the multicast group G1. The two-layer switching device 23 determines that the port P2 of the multicast group member replication information (P2, VLAN 1) in the multicast replication table entry (, G1,) does not receive the multicast group join message within the specified time, and deletes the multicast group member replication information (P2, VLAN 1) from the multicast replication table entry (, G1,) i.e., ((P3, VLAN 3), (P1, VLAN 0)).
In fig. 2B, when the multicast source of the multicast group G1 sends the two-layer multicast data packet again in the VLAN2, the two-layer switching device 23 receives the two-layer multicast data packet 201 through the port P4 of the VLAN2, finds the multicast entry (± G1, > { (P3, VLAN 3), (P1, VLAN 0) } according to the multicast group address G1 of the two-layer multicast packet 201, copies one two-layer multicast data packet 202 for the VLAN3 to which the router port P3 belongs, copies one two-layer multicast data packet 205 for the VLAN0 to which the multicast group member terminal 21 belongs, and sends the two-layer multicast data packet 202 to the three-layer routing device 24 through the port P3 of the router port; and sending a two-layer multicast data message 205 to the multicast group member terminal 21 through the port P1.
In fig. 2C, when the next query period arrives, the two-layer switching device receives the IGMP query message 207 of the multicast group G1 through the port P3 of the router port again, and finds the multicast entry (×, G1, > { (P3, VLAN 3), (P1, VLAN 0) } according to the multicast group address G1. The two-layer switching device 23 duplicates an IGMP query packet 208 of the multicast group G1 for the VLAN0 to which the multicast group member terminal 21 belongs, and sends the IGMP query packet 208 of the multicast group G1 to the multicast group member terminal 21 through the port P1.
In fig. 2C, when receiving the IGMP query packet 208 of the multicast group G2, the terminal 21 sends an IGMP leave packet 210 leaving the multicast group G1 to the two-layer switching device 23. The two-layer switching device 23 deletes the port P1 receiving the IGMP leave message 210 and the member port replication chain information (P1, VLAN 0) corresponding to the VLAN0 from the multicast replication table entry (×, G1) > { (P3, VLAN 3) }.
In fig. 2C, when the two-layer switching device 23 receives the two-layer multicast data packet 201 through the port P4 of the VLAN2 again, the multicast table entry (— G1) - > { (P3, VLAN 3) } is found according to the multicast group address G1 of the two-layer multicast packet 201, and only one two-layer multicast data packet 202 is copied for the VLAN3 to which the router port P3 belongs, and is sent to the three-layer routing device 24 through the port P3 of the router port. The third layer routing device 24 may encapsulate the received second layer multicast packet 202 into a third layer multicast packet based on the PIM protocol packet and send the third layer multicast packet to the RP server.
Fig. 3 is a schematic diagram of an embodiment of a two-layer switching apparatus of the present application. The apparatus 30 comprises: a setting module 31, a multicast table entry module 32, a receiving module 33, and a multicast forwarding module 34.
A setting module 31, configured to set a multicast replication entry matching the multicast group address of the multicast group; a multicast table entry module 32, configured to add a port of a router port of a multicast group and a VLAN id as router port replication link information to a multicast replication table entry; the ports of the multicast group members of different VLANs and the VLAN identifications are used as member port replication chain information to be added into a multicast replication list item; a receiving module 33, configured to receive a two-layer multicast data packet from a multicast source of a multicast group; a multicast forwarding module 34, configured to find a multicast replication entry according to the multicast group address of the received two-layer multicast data packet; copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router copy link information of the multicast copy table item, and sending the two-layer multicast data message through the port of the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
The receiving module 33 is further configured to receive a multicast group join message sent by each multicast group member; the multicast entry module 32 adds the port of the multicast group member of different VLANs and the VLAN id as the member port replication chain information to the multicast replication entry, including adding the port that receives the addition packet of each multicast group and the VLAN belonging to the multicast group member port replication chain information to the multicast replication entry.
The receiving module 33 is further configured to receive, through the router port, a multicast member query message of the multicast group; the multicast forwarding module 34 finds out a multicast replication entry according to the multicast group address of the multicast member query message; and copying a multicast member query message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member of the multicast copying table item, and sending the multicast member query message through the port of each multicast group member.
The multicast entry module 32 is further configured to determine that a port of any multicast group member replication information in the multicast replication entry does not receive the multicast group join message within a specified time, and delete any multicast group member replication information from the multicast replication entry.
The receiving module 33 is further configured to receive a multicast leaving packet leaving the multicast group from any port; the multicast entry module 32 is further configured to find a multicast replication entry according to the multicast group address of the multicast leaving packet; and deleting the port corresponding to the leaving message of the multicast group and the member port replication chain information corresponding to the VLAN to which the multicast group belongs from the multicast replication table entry.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for forwarding multicast data message by a two-layer switching device is characterized in that the method comprises the following steps:
setting a multicast replication table item matched with the multicast group address of the multicast group;
taking the router port of the multicast group and the VLAN identification as the replication link information of the router port and adding the replication link information into the multicast replication list item;
adding the ports of the multicast group members of different VLANs and the VLAN identifications as member port replication chain information into the multicast replication list item;
receiving a two-layer multicast data message from a multicast source of the multicast group;
searching the multicast replication table item according to the multicast group address of the two-layer multicast data message;
copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router port copy link information of the multicast copy table item, and sending the two-layer multicast data message through the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
2. The method of claim 1, wherein adding a port of a multicast group member of a different VLAN and a VLAN identification as member port replication chain information to the multicast replication entry comprises:
receiving multicast group joining messages sent by each multicast group member;
and taking the port for receiving the added message of each multicast group and the VLAN to which the port belongs as member port replication chain information of each multicast group member, and adding the member port replication chain information into the multicast replication list item.
3. The method of claim 2, further comprising:
receiving a multicast member query message of the multicast group through the router port;
searching the multicast replication table item according to the multicast group address of the multicast member query message;
and copying a multicast member query message for the VLAN to which each multicast group member belongs according to the copy information of each multicast group member of the multicast copy table item, and sending the multicast member query message through a port of each multicast group member.
4. The method of claim 3, further comprising:
and determining that a port of any multicast group member replication information in the multicast replication table item does not receive a multicast group joining message within a specified time, and deleting the multicast group member replication information from the multicast replication table item.
5. The method of claim 2, further comprising:
receiving a multicast leaving message leaving the multicast group from any port;
searching the multicast replication list item according to the multicast group address of the multicast leaving message;
and deleting the port corresponding to the multicast group leaving message and the member port replication chain information corresponding to the VLAN to which the multicast group leaving message belongs from the multicast replication table entry.
6. A two-layer switching device, the device comprising:
the setting module is used for setting a multicast replication table item matched with the multicast group address of the multicast group;
the table item module is used for adding the router port of the multicast group and the VLAN identification into the multicast replication table item as router port replication chain information; adding the port of the multicast group member of different VLAN and VLAN identification as member port replication chain information into the multicast replication list item;
a receiving module, configured to receive a two-layer multicast data packet from a multicast source of the multicast group;
the multicast forwarding module is used for searching the multicast replication table item according to the multicast group address of the two-layer multicast data message; copying a two-layer multicast data message for the VLAN to which the router port belongs according to the router port copy chain information of the multicast copy table item, and sending the two-layer multicast data message through the router port; and copying a two-layer multicast data message for the VLAN to which each multicast group member belongs according to the copying information of each multicast group member, and sending the two-layer multicast data message through the port of each multicast group member.
7. The apparatus of claim 6,
the receiving module is further configured to add a multicast group to a message sent by each multicast group member;
the entry module adds the port of the multicast group member of different VLANs and the VLAN identifier as member port duplication chain information to the multicast duplication entry, including adding the port receiving the multicast group addition packet and the VLAN belonging to the multicast group member as member port duplication chain information to the multicast duplication entry.
8. The apparatus of claim 7,
the receiving module is further configured to receive, through the router port, a multicast member query message of the multicast group;
the multicast forwarding module finds the multicast replication table item according to the multicast group address of the multicast member query message; and copying a multicast member query message for the VLAN to which each multicast group member belongs according to the copy information of each multicast group member of the multicast copy table item, and sending the multicast member query message through a port of each multicast group member.
9. The apparatus of claim 8,
the entry module is further configured to determine that a port of any multicast group member replication information in the multicast replication entry does not receive a multicast group join message within a specified time, and delete the multicast group member replication information from the multicast replication entry.
10. The apparatus of claim 7,
the receiving module is further configured to receive a multicast leaving message leaving the multicast group from any port;
the entry module is further configured to find the multicast replication entry according to the multicast group address of the multicast leaving packet; and deleting the port corresponding to the multicast group leaving message and the member port replication chain information corresponding to the VLAN to which the multicast group leaving message belongs from the multicast replication table entry.
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