Method and Device for Sending a Packet Based on Tunneling Protocol Used in Layer 2

• US 20100278183A1
• Filed: 07/12/2010
• Published: 11/04/2010
• Est. Priority Date: 01/25/2008
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Gu, Rongwei, Sun, Xingguo
• Granted Patent: US 8,509,243 B2
• Time in Patent Office: Days
• US Class Current: 370/395.53
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 12/4675 Dynamic sharing of VLAN information amongst network nodes configuration of the network or of network elements H04L41/08
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]

Abstract

A method and a device for sending a packet based on Tunneling Protocol used in Layer 2 are provided. Specifically, when a traffic flow needs to be sent from a network side to a client via QinQ termination equipment in which the tunneling protocol used in Layer 2 is used, forwarding address information corresponding to the client is obtained by searching a Dynamic Host Configuration Protocol (DHCP) snooping binding table according to Internet Protocol (IP) address information of the client in a packet of the traffic flow. The packet of the traffic flow can be sent to the client according to the obtained forwarding address information.

Claims

1. A method for sending a packet based on tunneling protocol used in Layer 2, wherein a traffic flow needs to be sent from a network side to a client via QinQ termination equipment and wherein tunneling protocol used in Layer 2 is used in the QinQ termination equipment, the method comprising:

obtaining forwarding address information corresponding to the client by searching a Dynamic Host Configuration Protocol (DHCP) snooping binding table according to Internet Protocol (IP) address information of the client in a packet of the traffic flow; and

sending the packet of the traffic flow to the client according to the obtained forwarding address information.

2. The method according to claim 1, wherein the forwarding address information corresponding to the client comprises two layers of Virtual Local Area Network (VLAN) tag information of the client.

3. The method according to claim 2, wherein sending the packet of the traffic flow to the client according to the obtained forwarding address information comprises:

implementing ARP entry learning and obtaining Media Access Control (MAC) address information of the client by sending an Address Resolution Protocol (ARP) packet to the client according to the obtained two layers of VLAN tag information and IP address information of the client; and

sending the packet of the traffic flow to the client according to the MAC address information and the two layers of VLAN tag information of the client.

4. The method according to claim 1, wherein the forwarding address information corresponding to the client comprises MAC address information and two layers of VLAN tag information of the client.

5. The method according to claim 4, wherein sending the packet of the traffic flow comprises sending the packet of the traffic flow to the client according to the obtained MAC address information and the two layers of VLAN tag information of the client.

6. The method according to claim 1, wherein the DHCP snooping binding table is generated through static configuration.

7. The method according to claim 1, wherein the DHCP snooping binding table is generated through dynamic learning.

8. The method according to claim 7, wherein the DHCP snooping binding table is generated through dynamic learning by dynamically generating the DHCP snooping binding table according to content of a DHCP packet communicated between the client and a DHCP server, wherein entries of the DHCP snooping binding table comprise the IP address and MAC address information of the client and two layers of VLAN tag information of the client.

9. The method according to claim 1, wherein the QinQ termination equipment comprises a router.

10. The method according to claim 1, wherein the QinQ termination equipment comprises a switch.

11. A device for sending a packet based on tunneling protocol used in Layer 2, the device comprising:

a forwarding address information obtaining unit configured to obtain forwarding address information corresponding to a client by searching a Dynamic Host Configuration Protocol (DHCP) snooping binding table according to Internet Protocol (IP) address information of the client in a packet of a traffic flow when traffic flow needs to be sent from a network side to the client via QinQ termination equipment in which tunneling protocol used in Layer 2 is used; and

a packet sending unit configured to send the packet of the traffic flow to the client according to the obtained forwarding address information.

12. The device according to claim 11, wherein when the obtained forwarding address information comprises two layers of Virtual Local Area Network (VLAN) tag information of the client, and wherein the packet sending unit comprises:

an Address Resolution Protocol (ARP) entry learning module configured to implement ARP entry learning and obtain Media Access Control (MAC) address information of the client by sending an ARP packet to the client according to the two layers of VLAN tag information and IP address information of the client; and

a packet sending module configured to send the packet of the traffic flow to the client according to the MAC address information and the two layers of VLAN tag information of the client.

13. The device according to claim 11, wherein when the obtained forwarding address information comprises MAC address information and two layers of VLAN tag information of the client, the packet sending unit comprises:

a packet sending module configured to send the packet of the traffic flow to the client according to the MAC address information and the two layers of VLAN tag information of the client.

14. The device according to claim 12, further comprising:

a DHCP snooping binding table generating unit configured to generate the DHCP snooping binding table according to content of DHCP packet communicated between the client and a DHCP server, wherein entries of the DHCP snooping binding table comprise;

the IP address and the MAC address information of the client and the two layers of VLAN tag information of the client.

15. The device according to claim 11, wherein the device is deployed at the QinQ termination equipment.

16. The device according to claim 11, wherein the device is deployed as an independent functional entity.