WO2014067328A1

WO2014067328A1 - Layer 2 forwarding method and forwarding device

Info

Publication number: WO2014067328A1
Application number: PCT/CN2013/082307
Authority: WO
Inventors: 李坤
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-10-31
Filing date: 2013-08-26
Publication date: 2014-05-08
Also published as: CN103795633A; CN103795633B

Abstract

Disclosed are a layer 2 forwarding method and a layer 2 forwarding device. The method comprises: when an uplink message or a downlink message arrives, learning the source media access control (MAC) address, destination MAC address, virtual local area network identity (VLAN ID) and the ingress port of the message, which are carried by the message, to a forwarding database (FDB) table; and using the destination MAC address and the source MAC address carried by the message as an index, retrieving in the FDB table the egress port of the message and the VLAN ID of the egress port side, and forwarding the message. Using the technical solutions of the embodiments of the present invention solves the problem in the related art whereby a layer 2 forwarding device fails to accurately perform layer 2 forwarding on messages of different types of services related to intelligent terminals, avoids frequent flooding operations, and saves network bandwidth.

Description

Layer 2 forwarding method and forwarding device

The present invention relates to a packet forwarding technology in a communication system, and in particular, to a Layer 2 forwarding method and a forwarding device. Background technique

With the advancement of the triple play service, services such as Voice over Internet Protocol (VoIP), Internet Protocol TV/Interactive Personal TV (IPTV), etc. are constantly evolving. Currently, the home gateway When the service-related packets of the smart terminal are processed, the Layer 2 forwarding cannot be performed accurately. Only frequent flooding operations can be performed. As a result, a large amount of network bandwidth is occupied, which may cause network congestion. Summary of the invention

In view of the above, the main purpose of the embodiments of the present invention is to provide a Layer 2 forwarding method and a forwarding device, which can perform accurate Layer 2 forwarding for packets of multiple service types of the intelligent terminal, avoid frequent flooding operations, and reduce Occupied network bandwidth.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

The embodiment of the invention discloses a layer 2 forwarding method, and the method includes:

When the uplink packet or the downlink packet arrives, the source media access control (MAC, Media Access Control) address, the destination MAC address, and the virtual local area network identifier carried in the packet are learned to the Forwarding Data Base (FDB) table. Medium

The destination MAC address and the source MAC address carried in the packet are indexed, and the outbound port and the outbound port side VLAN ID of the packet are retrieved in the FDB table, and the port side VLAN ID is carried. The message is forwarded from the retrieved out port.

Preferably, the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the packet are learned into the FDB table, including:

Establishing an FDB entry in the FDB table by using the source MAC address carried in the packet as an index, and storing a mapping relationship between the source MAC address carried in the packet and the inbound port of the packet; in the FDB entry, The destination MAC address carried in the packet is an index entry sub-entry, and the mapping relationship between the destination MAC address and the VLAN ID carried in the packet is saved.

Preferably, the destination port and the outbound port side VLAN ID of the packet are retrieved in the FDB table by using the destination MAC address and the source MAC address carried in the packet as an index, including:

The destination MAC address carried in the packet is used as an index, and the corresponding FDB entry is retrieved in the FDB table, and the egress port in the retrieved FDB entry is used as the egress port of the packet.

The source MAC address carried in the packet is used as an index, and the corresponding sub-entry is retrieved from the retrieved FDB entry, and the VLAN ID in the retrieved FDB sub-entry is used as the outbound port side VLAN of the packet. ID.

Preferably, the method further includes:

When the uplink packet or the downlink packet arrives, the VLAN ID carried in the packet is learned in the VLAN ID table maintained by the ingress port of the packet.

Preferably, the method further includes:

If the packet is an untagged packet that does not carry a VLAN ID, the Untag information is used as a VLAN ID to learn the VLAN ID table maintained for the ingress port of the packet.

Preferably, when the destination MAC address carried by the packet is used as an index, and the corresponding FDB entry is retrieved in the FDB table, the method further includes:

If the FDB entry corresponding to the destination MAC address of the packet is not retrieved, the VLAN ID table maintained by the port other than the inbound port of the packet is retrieved to obtain the learning for the other ports. The VLAN ID to which the corresponding VLAN is passed, corresponding to the corresponding port Sending the message respectively carrying the VLAN ID learned for the other port.

Preferably, the method further includes: when the source MAC address carried in the packet is an index, and the corresponding sub-entry is retrieved in the retrieved FDB entry, the method further includes:

If the sub-list corresponding to the source MAC address carried in the packet is not found in the retrieved FDB entry, the VLAN ID table maintained by the port of the retrieved packet is retrieved to obtain For the VLAN ID learned by the outbound port of the packet, the packet is forwarded by the packet, and the packet carries the packet for the VLAN ID learned by the outbound port of the packet.

The embodiment of the present invention further discloses a layer 2 forwarding device, where the layer 2 forwarding device includes: a receiving unit, a storage unit, a learning unit, a retrieval unit, and a forwarding unit;

The receiving unit is configured to receive an uplink packet or a downlink packet;

The storage unit is configured to store an FDB table;

The learning unit is configured to learn, when the receiving unit receives the uplink packet or the downlink packet, the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the packet to be learned into the storage unit. Stored in the FDB table;

The search unit is configured to: when the receiving unit receives the uplink packet or the downlink packet, use the destination MAC address and the source MAC address carried in the packet as an index, and search the FDB table stored in the storage unit to retrieve the report. The outgoing port and outgoing port side VLAN IDs of the text;

The forwarding unit is configured to: when the search unit retrieves the outbound port and the outbound port side VLAN ID, forward the packet carrying the port side VLAN ID to the retrieved out port.

Preferably, the learning unit is further configured to learn, when the receiving unit receives the uplink packet or the downlink packet, the mapping relationship between the source MAC address carried in the packet and the packet ingress port, and learn to the storage unit. The FDB entry of the saved FDB table, which is based on the source MAC address of the packet, and the mapping between the destination MAC address and the VLAN ID of the packet, and learns the FDB entry. The sub-table is established by using the destination MAC address carried in the packet as an index. Preferably, the retrieving unit is further configured to: when the receiving unit receives the uplink packet or the downlink packet, use the destination MAC address carried in the packet as an index, and retrieve the corresponding FDB in the FDB table saved by the storage unit. An entry to obtain an outbound port of the packet.

The source MAC address of the packet is used as an index, and the corresponding sub-entry is retrieved from the retrieved FDB entry to obtain the outbound port side VLAN ID of the packet.

Preferably, the storage unit is further configured to store a VLAN ID table;

The learning unit is further configured to: when the receiving unit receives the uplink packet or the downlink packet, the VLAN ID carried in the packet is learned by the storage unit to maintain the VLAN ID of the ingress port of the packet. In the table.

Preferably, the learning unit is further configured to: when the packet is an Untag packet that does not carry a VLAN ID, the Untag information is learned as a VLAN ID and is saved by the storage unit and maintained for the ingress port of the packet. In the VLAN ID table.

Preferably, the retrieving unit is further configured to: in the FDB table stored in the storage unit, the FDB corresponding to the destination MAC address carried by the packet is not retrieved by using the destination MAC address carried in the packet as an index. In the storage unit, the VLAN ID table maintained by the port other than the inbound port of the packet is retrieved to obtain the VLAN ID learned for the other port;

The forwarding unit is further configured to: when the search unit retrieves the VLAN IDs learned by the other ports, respectively, by using the other ports, respectively forwarding the carrying the VLAN IDs learned for the other ports Message.

Preferably, the retrieving unit is further configured to: in the index of the source MAC address carried in the packet, the sub-entry corresponding to the source MAC address carried in the packet is not retrieved in the retrieved FDB entry. In the storage unit, the VLAN ID table maintained by the outbound port of the packet is retrieved to obtain the VLAN ID learned by the outbound port of the packet;

The forwarding unit is further configured to retrieve, at the retrieval unit, the learning port for the packet When the VLAN ID is obtained, the packet carries the packet with the VLAN ID learned by the outbound port of the packet.

In the technical solution provided by the embodiment of the present invention, when the forwarding device receives the uplink packet or the downlink packet, the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the packet are carried in the packet. Learning in the FDB table; when receiving the packet that is reversed from the source MAC address and the destination MAC address of the packet, the destination MAC address and the source MAC address of the subsequent packet are indexed, and the FDB table is searched. The outbound port and the outbound port side VLAN ID of the subsequent packet are forwarded by the retrieved outbound port, and the subsequent packet carrying the retrieved outbound port VLAN ID is forwarded. In this way, packets of different VLAN IDs related to the smart terminal can be accurately forwarded at the Layer 2, avoiding frequent flooding operations and saving network bandwidth. DRAWINGS

1 is a schematic flowchart of an implementation process of a layer 2 forwarding method according to an embodiment of the present invention;

2 is a schematic structural diagram of a layer 2 forwarding device according to an embodiment of the present invention;

FIG. 3 is a schematic flowchart of an implementation process of forwarding by a layer 2 forwarding device according to an embodiment of the present invention. detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. 1 is a schematic flowchart of an implementation process of a Layer 2 forwarding method according to an embodiment of the present invention. As shown in FIG. 1, the method includes:

Step 101: When the uplink packet or the downlink packet arrives, the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the packet carried in the packet are learned into the FDB table.

In a preferred embodiment of the step 101, when the uplink packet or the downlink packet arrives, the FDB entry is created in the FDB table by using the source MAC address carried in the packet as an index, and the packet is saved. The mapping between the source MAC address carried in the packet and the inbound port of the packet; in the FDB entry, the sub-entry is created by using the destination MAC address carried in the packet as an index, and the packet is saved. And the mapping between the destination MAC address and the VLAN ID, where the uplink packet is a packet sent by the user side, and is forwarded by the layer 2 forwarding device to the switching network side; the downlink packet is the switching network side. A packet sent to the user side after being forwarded by the forwarding device.

In a further preferred embodiment of the step 101, when the uplink packet or the downlink packet arrives, the source MAC address that is carried in the destination message and the inbound port of the arrival message are corresponding to each other. As a destination MAC address and an egress port of the packet that is reversed from the source MAC address and the destination MAC address of the arrival packet, and the source MAC address carried in the arrival message and the arrival of the arrival message The mapping relationship between the ports and the FDB table, and the FDB entries established by using the source MAC address of the incoming packet as an index;

Passing the destination MAC address and the VLAN ID carried in the arrival packet as the source MAC address and the outbound port side VLAN ID of the packet that is reversed from the source MAC address and the destination MAC address of the arrival packet, and The mapping between the destination MAC address and the VLAN ID carried in the packet is learned, and the destination MAC address of the arrival packet is learned as a sub-entry established by the packet.

In another preferred embodiment of step 101, when the uplink packet or the downlink packet arrives, the VLAN ID carried in the packet is learned to be the VLAN ID maintained for the ingress port of the packet. In the table, specifically why the VLAN ID table is established will be detailed in step 102;

Specifically, if the packet is an unlabeled (Untag) packet that does not carry a VLAN ID, the Untag information is learned as a VLAN ID in a VLAN ID table maintained for the ingress port of the packet; The Untag packet is a packet that does not contain a VLAN tag (Tag) field. The VLAN tag is a field that encapsulates the VLAN ID in the packet defined by the IEEE, Institute of Electrical and Electronics Engineers (IEEE, IEEE 802.1Q). The name.

The VLAN ID carried in the packet is learned as the VLAN maintained for the ingress port of the packet. In the process in the ID table, the packet includes a unicast packet and a broadcast packet.

In a further preferred implementation of the step 101, the learning process for the FDB table follows an aging mechanism, that is, when an uplink packet or a downlink packet arrives, if the MAC address and the destination MAC address carried in the packet are If the VLAN ID and the inbound port of the packet have been learned in the FDB table, the aging time of the entry is extended.

Correspondingly, the learning process for the VLAN ID table also follows the aging mechanism, that is, when the uplink packet or the downlink packet arrives, if the VLAN ID carried in the packet is learned, the packet is learned to be the ingress port. In the maintained VLAN ID table, the aging time of the VLAN ID table is extended.

Step 102: Search for the outbound port and the outbound port side VLAN ID of the packet in the FDB table by using the destination MAC address and the source MAC address carried in the packet as the index, and carry the report of the port side VLAN ID. Text, forwarded from the retrieved out port.

In a preferred implementation of step 102, when the destination port and the outbound port side VLAN ID of the packet are retrieved in the FDB table by using the destination MAC address and the source MAC address carried in the packet as an index, the following manner can be adopted. The implementation is as follows: the destination MAC address carried in the message is used as an index, and the corresponding FDB entry is retrieved in the FDB table, and the egress port in the retrieved FDB entry is used as the egress port of the packet; The source MAC address carried in the packet is an index, and the corresponding sub-list is retrieved in the retrieved FDB entry, and the VLAN ID in the retrieved FDB sub-entry is used as the outbound port-side VLAN ID of the packet.

The destination MAC address carried in the packet is an index, and when the corresponding FDB entry is retrieved in the FDB table,

If the packet is a broadcast packet sent by the switching network side device, since the active MAC address in the network is not the broadcast address of the 48-bit all-one broadcast address, the destination MAC address cannot be learned. The FDB entry to be forwarded by the broadcast packet. Therefore, if the destination MAC address of all the broadcast packets carried by the broadcast packet is used as the index, the corresponding FDB entry cannot be retrieved in the FDB table. Then, when the broadcast packet is When the switch is connected to the switching network port, the broadcast packet will be carried on the operation. If the broadcast packet reaches the user-side port, the FDB table cannot be retrieved, so the user-side VLAN ID cannot be forwarded for accurate forwarding.

If the packet is an unknown unicast packet, the destination MAC address carried in the unicast packet is used as an index, and the corresponding FDB entry cannot be retrieved in the FDB table, and the packet is processed according to the related technical processing method. The port flooding operation, that is, the packet will be forwarded through the other ports except the inbound port. When the unicast packet reaches the port on the switching network, the unicast packet will be carried by the carrier in advance. The VLAN ID of the switching network on the port is forwarded and forwarded. When the unicast packet reaches the user-side port, the FDB table cannot be retrieved. Therefore, the user-side VLAN ID cannot be forwarded for accurate forwarding. .

In a further preferred embodiment of the step 102, the problem that the above-mentioned message cannot be accurately forwarded is also solved, and the frequent message flooding operation is reduced, and the above technical effects can be achieved by the following methods:

If the FDB entry corresponding to the destination MAC address of the packet is not retrieved, the VLAN ID table maintained by the port other than the inbound port of the packet is retrieved to obtain the learning for the other ports. The obtained VLAN IDs are respectively forwarded by the other ports, and the corresponding packets respectively carry the packets learned by the other ports.

In particular, if the VLAN ID table maintained by a port other than the inbound port of the packet contains Untag information, the Untag packet carrying the VLAN ID is forwarded through the port.

In another preferred implementation of step 102, the source MAC address carried in the packet is an index, and when the corresponding VLAN ID is retrieved in the sub-item of the retrieved FDB entry, if the packet is For the downlink unicast message that the broadcast packet of the originating service is first responded to, because the network does not have the active MAC address as the broadcast address, in step 101, only the source MAC address of the broadcast message is In the mapping between the inbound ports and the FDB entry that is set up with the source MAC address as the index, the destination MAC address of the broadcast packet is all 48 bits. The mapping between the address and the VLAN ID is learned, and the sub-entry of the FDB entry is learned. In this manner, in step 102, the source MAC address of the downlink unicast packet is used as an index, and the unicast downlink is used. If the destination MAC address is the FDB entry of the index, the sub-entry corresponding to the source MAC address of the downlink unicast packet cannot be retrieved, and the downlink unicast packet cannot carry the port-side VLAN ID. For accurate forwarding.

In a further preferred implementation of step 102, the source MAC address carried in the file is used as an index, and the corresponding VLAN ID is not retrieved in the sub-item of the retrieved FDB entry, and the search is performed. The VLAN ID table maintained by the outbound interface of the packet is configured to obtain a VLAN ID that is learned by the outbound port of the packet, and the outbound port carries the VLAN ID learned for the outbound port of the packet. The message;

In particular, if the ¥!^^10 table maintained for the packet out port contains 111^8 information, the Untag message carrying the VLAN ID is forwarded through the outgoing port of the packet.

The embodiment of the present invention further describes a Layer 2 forwarding device. FIG. 2 is a schematic structural diagram of a Layer 2 forwarding device according to an embodiment of the present invention. As shown in FIG. 2, the Layer 2 forwarding device includes: a receiving unit 21 and a storage unit 22 The learning unit 23, the retrieving unit 24, and the forwarding unit 25; wherein, the receiving unit 21 is configured to receive an uplink packet or a downlink packet;

The storage unit 22 is configured to store the FDB table;

The learning unit 23 is configured to learn to store the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the packet when the receiving unit 21 receives the uplink packet or the downlink packet. The FDB table stored by the unit 22;

The retrieving unit 24 is configured to: when the receiving unit 21 receives the uplink packet or the downlink packet, the destination MAC address and the source MAC address carried in the packet are indexed, and the FDB table stored in the storage unit 22 searches the FDB table. Outbound port and outbound port side VLAN ID of the packet;

The forwarding unit 25 is configured to forward the packet carrying the port-side VLAN ID from the retrieved egress port when the retrieving unit 24 retrieves the egress port and the egress port-side VLAN ID. The learning unit 23 is further configured to: when the receiving unit 21 receives the uplink packet or the downlink packet, learn the mapping relationship between the source MAC address carried in the packet and the packet ingress port, and learn to the storage unit 22 In the FDB table of the saved FDB table, the source MAC address carried in the packet is an FDB entry, and the mapping between the destination MAC address and the VLAN ID of the packet is learned, and the FDB entry is learned. The sub-table is established by using the destination MAC address carried in the packet as an index.

The search unit 24 is further configured to: when the receiving unit 21 receives the uplink packet or the downlink packet, retrieve the corresponding FDB in the FDB table saved by the storage unit 22 by using the destination MAC address carried in the packet as an index. An entry to obtain an outbound port of the packet.

The storage unit 22 is further configured to store a VLAN ID table.

Correspondingly, the learning unit 23 is further configured to: when the receiving unit 21 receives the uplink packet or the downlink packet, the VLAN ID carried by the packet is learned by the storage unit 22 and is the ingress port of the packet. Maintained in the VLAN ID table.

The learning unit 23 is further configured to: when the packet is an Untag packet that does not carry the VLAN ID, the Untag information is used as a VLAN ID, and is learned by the storage unit 22 and maintained for the ingress port of the packet. In the VLAN ID table.

The search unit 24 is further configured to: in the FDB table stored in the storage unit 22, the FDB table corresponding to the destination MAC address carried in the packet is not retrieved by using the destination MAC address carried in the packet as an index. In the storage unit 22, the VLAN ID table maintained by the port other than the inbound port of the packet is retrieved to obtain the VLAN ID learned by the learning unit 23 for the other ports.

The forwarding unit 25 is further configured to: when the retrieval unit 24 retrieves the VLAN IDs learned for the other ports, respectively, by using the other ports, forwarding and carrying the other The packet of the VLAN ID learned by the port.

The search unit 24 is further configured to: when the source MAC address carried in the packet is used as an index, and the sub-entry corresponding to the source MAC address carried in the packet is not retrieved in the retrieved FDB entry, In the storage unit 22, the VLAN ID table maintained by the outgoing port of the packet is retrieved to obtain the VLAN ID learned by the learning unit 23 for the outgoing port of the packet;

The forwarding unit 25 is further configured to: when the retrieval unit 24 retrieves the VLAN ID learned for the packet egress port, forward the packet to the VLAN ID learned by the egress port. The message.

In a practical application, the receiving unit 21, the learning unit 23, the retrieving unit 24, and the forwarding unit 25 may each be a central processing unit (CPU) in the layer 2 forwarding device, and a digital signal processor (DSP, Digital). Signal Processor) or Field Programmable Gate Array (FPGA) implementation;

The storage unit 22 can be implemented by a memory in a Layer 2 forwarding device.

The following is a description of the Layer 2 forwarding method and the Layer 2 forwarding device provided by the embodiment of the present invention by using the Layer 2 forwarding device as the home gateway. The smart gateway can be connected to the smart terminal. The IPTV service, for the uplink packet and the downlink packet of the foregoing service, is described in this embodiment from the first initiation of the service by the home gateway to the device, and the completion of the uplink and downlink packets of the service to the home gateway. The process of the FDB table, in which the process of the home gateway performing Layer 2 forwarding is as shown in FIG. 3, including:

Step 301: The smart terminal broadcasts an uplink packet for the Internet service and the IPTV service.

Here, when the service is first initiated, the smart terminal does not have a MAC address corresponding to the switching network side device. Therefore, the destination MAC address field of the uplink message carries a 48-bit all-1 broadcast address to the home gateway. The uplink message is broadcasted through the home gateway.

The source MAC address field of the uplink packet carries the MAC address MAC-1 of the smart terminal, and the uplink packet for the Internet service is an Untag packet that does not carry the VLAN ID. The VLAN ID carried in the uplink packet of the IPTV service is VLAN-ID-IPTV. The service type can be classified by the VLAN ID carried in the user-side packet. If the packet is an Untag packet that does not carry the VLAN ID, the The packet is a message for the Internet service.

Step 302: The home gateway receives the uplink packet, learns the FDB table and the VLAN ID table, and forwards the uplink packet.

When receiving the uplink packet, the home gateway learns the mapping relationship between the source MAC address MAC-1 carried in the uplink packet and the inbound port Port-1 of the uplink packet, and learns that the FDB table is indexed by MAC-1. In the FDB entry;

The destination MAC address of the uplink packet is a broadcast address. Therefore, the mapping between the destination MAC address and the VLAN ID carried in the uplink packet is not learned in the sub-entry of the FDB entry.

When receiving the uplink packet, the home gateway learns the VLAN ID table maintained for the port Port-1 by using the VLAN-ID-IPTV carried in the uplink packet of the IPTV service and the Untag information of the uplink packet for the Internet service. in.

Here, when the home gateway forwards the uplink packet, the uplink packet is a broadcast packet, and the FDB table is empty when the service is first initiated. Therefore, port flooding is performed on the uplink packet, that is, The uplink packet is forwarded out through the port other than the port port-1; and when the uplink packet arrives at the home gateway switching network port, the port is pre-allocated for the switching network port. The switching network side VLAN ID is forwarded by the switching network side port, and the switching network side port is assigned a unique and different switching network side VLAN ID, and the switching network side VLAN ID is determined by the operator. Different business types are pre-allocated.

Step 303: The home gateway receives the downlink packet, learns the FDB table and the VLAN ID table, and forwards the downlink packet.

Here, the home gateway receives the downlink packet for the Internet service and the downlink packet for the IPTV service by using the network port Port-2 and the port port-3, and the The downlink packet of the IPTV service carries the MAC address MAC-2 and MAC-3 of the device that responds to the Internet service and the IPTV service on the switching network side as the source MAC address, and carries the VLAN-ID-Port-2 and VLAN-ID. Port-3, and respectively carrying the MAC address MAC-1 of the smart terminal as the destination MAC address, wherein the VLAN-ID-Port-2 and VLAN-ID-Port-3 are correspondingly assigned to the port Port-2, Port -3 Switched network side VLAN ID.

Here, when the home gateway receives the downlink packet, learning the FDB table may be implemented by:

The mapping between the source MAC address MAC-2 and the inbound port Port-2 of the downlink packet carried in the downlink packet of the Internet service is learned in the FDB entry in which the FDB table is indexed by using the MAC-2 index; In the FDB entry, the mapping between the destination MAC address MAC-1 and the VLAN-ID-Port-2 carried in the downlink information is learned, and the FDB entry is learned by using MAC-1 as an index. In the child table entry;

The mapping between the source MAC address MAC-3 carried in the downlink packet of the IPTV service and the inbound port Port-3 of the downlink packet is learned in the FDB entry in which the FDB table is indexed by using the MAC-3 index; In the FDB entry, the mapping between the destination MAC address MAC-1 and the VLAN-ID-Port-3 carried in the downlink packet is learned, and the FDB entry is learned by using MAC-1 as an index. In the child table entry.

Here, when the home gateway receives the downlink packet, the learning of the VLAN ID table can be implemented by:

The VLAN-ID-Port-2 carried in the downlink packet for the Internet service is learned in the VLAN ID table maintained for the port Port-2.

The VLAN-ID-Port-3 carried in the downlink packet for the IPTV service is learned in the VLAN ID table maintained for the port Port-3.

Here, the home gateway forwards the downlink packet, which can be implemented by: using the destination MAC address MAC-1 carried in the downlink packet for the Internet service as an index, The corresponding FDB entry is retrieved in the FDB table. In step 302, the FDB entry is indexed in the FDB table, and the outgoing port Port-1 of the downlink packet is retrieved.

In the step 302, the sub-entry is not established in the FDB entry. In this case, the source MAC address MAC-2 of the downlink packet is used as an index, and the outbound port side VLAN of the downlink packet cannot be retrieved. ID, according to step 302, for the port Port-1, the VLAN-ID-IPTV and Untag information in the VLAN ID table have been learned, and the following operations are performed:

The port-port-1 is used to forward the downlink packets carrying the VLAN-ID-IPTV and the Untag packets carrying the VLAN ID.

In this way, the smart terminal can ensure that the downlink packet is received for the Internet service.

Correspondingly, when the downlink packet for the IPTV service is forwarded, the destination MAC address MAC-1 carried in the downlink packet for the IPTV service is used as an index, and the corresponding FDB entry is retrieved in the FDB table. In step 302, the FDB is already in the FDB. An FDB entry with the MAC-1 as the index is established in the table, and the outbound port Port-1 of the downlink packet is retrieved;

If the sub-entry is not established in the FDB entry, the outbound port side VLAN of the downlink packet cannot be retrieved by using the source MAC address MAC-3 of the downlink packet as an index. ID, according to step 302, for the port Port-1, the VLAN-ID-IPTV and Untag information in the VLAN ID table have been learned, and the following operations are performed:

In this way, the smart terminal can ensure that the downlink message is received for the IPTV service.

Step 304: The smart terminal sends an uplink packet for the Internet service and the IPTV service.

The uplink packet is an uplink packet sent by the smart terminal after receiving the downlink packet for the Internet service and the IPTV service forwarded by the home gateway.

In step 303, when the smart terminal receives the downlink packet for the Internet service and the IPTV service, the smart terminal learns the exchange network device corresponding to the Internet service and the IPTV service from the received message. The MAC addresses are MAC-2 and MAC-3 respectively. Therefore, in this step, the uplink packets corresponding to the Internet service and the IPTV service sent by the intelligent terminal are MAC-2 and MAC-3. The source MAC address and the VLAN ID carried in the uplink packet of the Internet service and the IPTV service are the same as described in step 301.

Step 305: The home gateway receives the uplink packet, learns the FDB table and the VLAN ID table, and forwards the uplink packet.

Here, when the home gateway receives the uplink packet, learning the FDB table may be implemented by:

The FDB that is established by the home gateway in the source MAC address MAC-1 carried in the uplink packet according to the destination MAC address MAC-2 and Untag information carried in the uplink packet of the Internet service. In the entry, the sub-table is created by using the MAC-2 as an index, and the mapping relationship between the MAC-2 and the Untag information is saved.

The home gateway is configured with the source MAC address MAC-1 carried in the uplink packet, which is established in step 302, according to the destination MAC address MAC-3 and the VLAN-ID-IPTV carried in the uplink packet for the IPTV service. In the FDB entry, a sub-table is created by using the MAC-3 as an index, and the mapping relationship between the MAC-3 and the VLAN-ID-IPTV is saved.

Here, when the home gateway receives the uplink packet, the learning of the VLAN ID table can be implemented by:

The VLAN ID table of the VLAN-ID-IPTV carried in the uplink packet for the IPTV service and the Untag information of the uplink packet for the Internet service are learned. Aging time.

Here, the home gateway forwards the uplink packet, which can be implemented by: searching for the corresponding FDB entry in the FDB table by using the destination MAC address MAC-2 carried in the uplink file for the Internet service, step 303 The FDB entry indexed by the MAC-2 is established in the FDB table, and the outbound port Port-2 of the uplink packet is retrieved; The source MAC address MAC-1 carried in the uplink packet of the Internet service is used as an index, and the corresponding sub-entry is retrieved from the retrieved FDB entry, and the outbound port side VLAN of the uplink packet is retrieved. ID is VLAN-ID-Port-2;

And forwarding, by using the retrieved port port-2, the uplink packet carrying the VLAN-ID-Port-2;

Correspondingly, the outbound port of the uplink packet for the IPTV service is port-3, and the outbound port side VLAN ID of the uplink packet is VLAN-ID-Port-3, and the retrieved port port is retrieved. -3: Forwarding the uplink packet carrying the VLAN-ID-Port-3.

Step 306: The home gateway receives the downlink packet, learns the FDB table and the VLAN ID table, and forwards the downlink packet.

Here, the downlink packet is a packet that responds to the uplink packet in step 305, and includes a downlink packet that responds to the Internet service and the IPTV service, and the downlink packet that responds to the Internet service and the IPTV service, Corresponding to the MAC address MAC-2 and MAC-3 of the device that responds to the Internet service and the IPTV service on the switching network side as the source MAC address, which carries the VLAN-ID-Port-2 and VLAN-ID-Port-3, and simultaneously The MAC address MAC-1 of the intelligent terminal is carried as the destination MAC address.

And discovering the source MAC address, the destination MAC address, the VLAN ID, and the inbound port of the downlink packet that are carried in the downlink packet, and in step 303, if the entry in the FDB table is learned, the extension is performed. The aging time of FDB entries.

The VLAN-ID-Port-2 carried in the downlink packet of the Internet service has been learned in the VLAN ID table maintained for the port Port-2, and the aging time of the VLAN ID table is extended. The VLAN-ID-Port-3 carried in the downlink packet of the IPTV service has been learned in the VLAN ID table maintained for the port port-3, and the aging time of the VLAN ID table is extended. Here, the home gateway forwards the downlink packet, and the method is as follows: The destination MAC address MAC-1 carried in the downlink packet of the Internet service is used as an index, and the corresponding FDB entry is retrieved in the FDB table, in step 302. The FDB entry with the MAC-1 as the index has been established in the FDB table, and the outbound port Port-1 of the downlink packet is retrieved at this time;

The source MAC address MAC-2 carried in the downlink packet for the Internet service is used as an index, and the corresponding sub-entry is retrieved in the retrieved FDB entry. In step 305, the FDB entry that has been retrieved is already in the In the sub-item, the mapping between the MAC-2 and the Untag information is saved, and the downlink packet is retrieved as an Untag packet that does not carry the VLAN ID.

And forwarding the downlink packet that does not carry the VLAN ID by using the retrieved port port-1; correspondingly, the outbound port of the downlink packet for the IPTV service is retrieved as Port-1, and the downlink packet is The outbound port side VLAN ID is VLAN-ID-IPTV, and the downlink packet carrying the VLAN-ID-IPTV is forwarded through the retrieved outbound port Port-3.

Step 307: The home gateway receives the uplink packet, learns the FDB table and the VLAN ID table, and forwards the uplink packet.

In step 305, the source MAC address, the destination MAC address, the VLAN ID, and the ingress port of the uplink packet carried in the uplink packet are completely learned in the entry corresponding to the FDB table. The aging time of the FDB entry is extended.

The VLAN-ID-IPTV carried in the uplink packet for the IPTV service and the Untag information of the uplink packet for the Internet service are discovered. The VLAN ID maintained for the port Port-1 has been learned. In the table, the aging time of the VLAN ID table is extended.

Here, the home gateway forwards the uplink packet, which can be implemented by: searching for the corresponding FDB entry in the FDB table by using the destination MAC address MAC-2 carried in the uplink file for the Internet service, step 303 An FDB entry indexed by the MAC-2 is set in the FDB table. The outgoing port Port-2 of the upstream packet is retrieved. The source MAC address MAC- carried in the uplink packet for the Internet service is configured. 1 is an index, and the corresponding sub-list is retrieved in the retrieved FDB entry, and the outbound port side VLAN ID of the uplink packet is VLAN-ID-Port-2;

Through the steps 301 to 305, the home gateway has completely learned the FDB table and the VLAN ID table for the uplink packet and the downlink packet of the Internet service and the IPTV service, and repeatedly performs the subsequent receiving of the uplink packet or the downlink packet. In step 306 and step 307, accurate Layer 2 forwarding of the uplink packet or the downlink packet is implemented. Step 306 and step 307 are not limited in sequence.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

claims

1. A layer 2 forwarding method, the method includes:

When an uplink message or a downlink message arrives, the source medium access control MAC address, destination MAC address, virtual LAN identification number VLAN ID and the ingress port of the message carried in the message are learned from the forwarding database FDB. in the table;

Using the destination MAC address and source MAC address carried in the message as indexes, the outgoing port and outgoing port side VLAN ID of the message are retrieved in the FDB table, and the message carrying the outgoing port side VLAN ID is retrieved from The retrieved egress port is forwarded.

2. The method according to claim 1, wherein said learning the source MAC address, destination MAC address, VLAN ID carried by the message and the ingress port of the message into the FDB table includes:

Create an FDB entry in the FDB table using the source MAC address carried in the message as an index, and save the mapping relationship between the source MAC address carried in the message and the incoming port of the message; in the above FDB entry, use The destination MAC address carried in the message is a sub-entry of the index, and the mapping relationship between the destination MAC address carried in the message and the VLAN ID is saved.

3. The method according to claim 2, wherein the egress port and egress port side VLAN ID of the message are retrieved in the FDB table using the destination MAC address and source MAC address carried in the message as indexes, including:

Using the destination MAC address carried in the message as an index, search the corresponding FDB entry in the FDB table, and use the egress port in the retrieved FDB entry as the egress port of the message;

Using the source MAC address carried in the message as an index, search the corresponding sub-entry in the retrieved FDB entry, and use the VLAN ID in the retrieved FDB sub-entry as the egress port side VLAN of the message. ID.

4. The method according to claim 3, wherein the method further includes:

When an uplink packet or a downlink packet arrives, the VLAN ID carried in the packet is learned to match the in the VLAN ID table maintained by the inbound port of the above message.

5. The method according to claim 4, wherein the method further includes:

If the packet is an untagged Untag packet that does not carry a VLAN ID, the Untag information is used as the VLAN ID and learned into the VLAN ID table maintained for the incoming port of the packet.

6. The method according to claim 3, 4 or 5, wherein when retrieving the corresponding FDB entry in the FDB table using the destination MAC address carried in the message as an index, the method further includes:

If the FDB entry corresponding to the destination MAC address carried in the message is not retrieved, the VLAN ID tables maintained separately for other ports except the message inlet port are retrieved to obtain the VLAN ID tables separately learned for the other ports. The received VLAN IDs are respectively forwarded through the other ports, and the packets respectively carrying the VLAN IDs learned for the other ports are correspondingly forwarded.

7. The method according to claim 3, 4 or 5, wherein when searching for the corresponding sub-entry in the retrieved FDB entry using the source MAC address carried in the message as an index, the method further include:

If the sub-entry corresponding to the source MAC address carried in the message is not retrieved in the retrieved FDB entry, the VLAN ID table maintained for the outbound port of the retrieved message is retrieved to obtain For the VLAN ID learned at the message outgoing port, forward the messages carrying the VLAN ID learned at the message outgoing port through the message outgoing port.

8. A layer 2 forwarding device, the layer 2 forwarding device includes: a receiving unit, a storage unit, a learning unit, a retrieval unit and a forwarding unit; wherein,

The receiving unit is configured to receive uplink messages or downlink messages;

The storage unit is configured to store the FDB table;

The learning unit is configured to, when the receiving unit receives an uplink message or a downlink message, learn the source MAC address, destination MAC address, VLAN ID carried in the message and the inlet port of the message to the storage unit stored in the FDB table; The retrieval unit is configured to, when the receiving unit receives an uplink message or a downlink message, use the destination MAC address and source MAC address carried in the message as indexes to retrieve the message in the FDB table saved in the storage unit. The egress port and egress port side VLAN ID of the document;

The forwarding unit is configured to, when the retrieval unit retrieves the egress port and the egress port side VLAN ID, forward the message carrying the egress port side VLAN ID out of the retrieved egress port.

9. The layer 2 forwarding device according to claim 8, wherein,

The learning unit is also configured to, when the receiving unit receives an uplink message or a downlink message, learn the mapping relationship between the source MAC address carried in the message and the message incoming port to the FDB stored in the storage unit. In the FDB entry of the table, the source MAC address carried in the message is used as the index; the mapping relationship between the destination MAC address carried in the message and the VLAN ID is learned, and the FDB entry is The destination MAC address carried in the packet is in the sub-entry created by the index.

10. The layer 2 forwarding device according to claim 9, wherein,

The retrieval unit is also configured to, when the receiving unit receives an uplink message or a downlink message, use the destination MAC address carried in the message as an index to retrieve the corresponding FDB entry in the FDB table saved in the storage unit, To obtain the outbound port of the message;

Using the source MAC address carried in the message as an index, search the corresponding sub-entry in the retrieved FDB entry to obtain the egress port side VLAN ID of the message.

11. The layer 2 forwarding device according to claim 10, wherein,

The storage unit is also configured to store the VLAN ID table;

The learning unit is also configured to, when the receiving unit receives an uplink message or a downlink message, learn the VLAN ID carried in the message to the VLAN ID stored in the storage unit and maintained for the incoming port of the message. table.

12. The layer 2 forwarding device according to claim 10, wherein,

The learning unit is also configured to detect when the packet is an Untag packet that does not carry a VLAN ID. At that time, the Untag information is learned as the VLAN ID into the VLAN ID table saved in the storage unit and maintained for the incoming port of the message.

13. The layer 2 forwarding device according to claim 10, 11 or 12, wherein the retrieval unit is further configured to use the destination MAC address carried in the message as an index in the FDB table saved by the storage unit , when the FDB entry corresponding to the destination MAC address carried in the message is not retrieved, in the storage unit, retrieve the VLAN ID table maintained for other ports except the incoming port of the message to obtain the VLAN ID table for the message. VLAN IDs learned by other ports respectively;

The forwarding unit is also configured to, when the retrieval unit retrieves the VLAN IDs learned for the other ports, correspondingly forward the VLAN IDs carrying the VLAN IDs learned for the other ports through the other ports. message.

14. The layer 2 forwarding device according to claim 10, 11 or 12, wherein the retrieval unit is further configured to use the source MAC address carried in the message as an index, and among the retrieved FDB entries, there is no When the sub-entry corresponding to the source MAC address carried in the message is retrieved, in the storage unit, the VLAN ID table maintained for the message outgoing port is retrieved to obtain the VLAN learned by the message outgoing port. ID;

The forwarding unit is also configured to, when the retrieval unit retrieves the VLAN ID learned for the message outgoing port, forward the VLAN ID learned for the message outgoing port through the message outport. of the message.