METHOD, SYSTEM AND DEVICE FOR REMOVING MEDIA ACCESS CONTROL ADDRESSES

• US 20100128728A1
• Filed: 01/26/2010
• Published: 05/27/2010
• Est. Priority Date: 09/12/2007
• 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: SUN, Guangyu, TENG, Xindong
• Granted Patent: US 8,259,725 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 2101/622 Layer-2 addresses, e.g. medium access control [MAC] addresses
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04L 61/2596 Translation of addresses of the same type other than IP, e.g. translation from MAC to MAC addresses

Abstract

The present invention discloses a method, system and device for removing Media Access Control (MAC) addresses. The method includes: sending, by a first User-facing Provider Edge (UPE), a MAC Address Withdraw message, when a handover happens on an access network; receiving, by a network provider edge (NPE), the MAC Address Withdraw message; and removing, by the NPE, a Backbone Media Access Control (B-MAC) address table corresponding to a Virtual Private LAN Service (VPLS) network and forwarding the MAC Address Withdraw message, if the message carries no specific identifier; or directly forwarding, by the NPE, the MAC Address Withdraw message, if the message carries a specific identifier. In the present invention, a specific identifier is added to a MAC Address Withdraw message so as to avoid unnecessary MAC address learning by NPE and UPE devices and to reduce the impact, caused by MAC address learning, on network devices.

Claims

1. A method for removing Media Access Control (MAC) addresses, comprising:

sending, by a first User-facing Provider Edge (UPE), a MAC Address Withdraw message, when a handover happens on an access network;

receiving, by a network provider edge (NPE), the MAC Address Withdraw message; and

removing, by the NPE, a Backbone Media Access Control (B-MAC) address table corresponding to a Virtual Private LAN Service (VPLS) network and forwarding the MAC Address Withdraw message if the message carries no specific identifier, or directly forwarding the MAC Address Withdraw message if the message carries a specific identifier.

2. The method of claim 1, further comprising:

by a second User-facing Provider Edge (UPE), upon reception of the message forwarded by the NPE, removing a B-MAC address table corresponding to the VPLS network if the message carries no specific identifier;

or removing a B-MAC address entry corresponding to the specific identifier in a Customer Media Access Control (C-MAC) address table, if the message carries a specific identifier.

3. The method of claim 1, wherein the specific identifier is one of:

a user identifier of a Customer Edge (CE);

an interface identifier of the UPE; and

a general identifier of all B-MAC addresses.

4. The method of claim 2, wherein, if the message carries a user identifier and a substitute address for a B-MAC address, after the step of removing the B-MAC address entry corresponding to the user identifier in the C-MAC address table, the method further comprises:

adding the substitute address for the B-MAC address to the B-MAC address entry corresponding to the user identifier.

5. A system for removing Media Access Control (MAC) addresses, comprising:

a network provider edge (NPE), configured to;

receive a MAC Address Withdraw message from a first User-facing Provider Edge (UPE) when a handover happens on an access network, and remove a Backbone Media Access Control (B-MAC) address table corresponding to a Virtual Private LAN Service (VPLS) network and forward the message if the message carries no specific identifier, or directly forward the message if the message carries a specific identifier; and

a second User-facing Provider Edge (UPE), configured to;

upon reception of the message forwarded by the NPE, remove a B-MAC address table corresponding to the VPLS network if the message carries no specific identifier, or remove a B-MAC address entry corresponding to the specific identifier in a Customer Media Access Control (C-MAC) address table if the message carries a specific identifier.

6. The system of claim 5, wherein the specific identifier is one of:

a user identifier of a Customer Edge (CE);

an interface identifier of the UPE; and

a general identifier of all B-MAC addresses.

7. The system of claim 6, wherein the UPE comprises:

a message receiving module, configured to receive the message forwarded by the NPE;

a first address removing module, configured to remove the B-MAC address table corresponding to the VPLS network, if the message received by the message receiving module carries no specific identifier;

a second address removing module, configured to remove a B-MAC address entry corresponding to the user identifier in the C-MAC address table, if the message received by the message receiving module carries a user identifier;

a third address removing module, configured to remove a group of B-MAC address entries corresponding to the interface identifier in the C-MAC address table, if the message received by the message receiving module carries an interface identifier; and

a fourth address removing module, configured to remove B-MAC address entries corresponding to the general identifier in the C-MAC address table, if the message received by the message receiving module carries a general identifier.

8. The system of claim 7, wherein the UPE further comprises:

a substitute address adding module, configured to add the substitute address for the B-MAC address to the B-MAC address entry corresponding to the user identifier, if the message received by the message receiving module carries a user identifier and a substitute address for a B-MAC address.

9. A Network Provider Edge (NPE), comprising:

a message receiving module, configured to receive a MAC Address Withdraw message from a first User-facing Provider Edge (UPE) when a handover happens on an access network; and

a message processing module, configured to;

remove a Backbone Media Access Control (B-MAC) address table corresponding to a Virtual Private LAN Service (VPLS) network and forward the message if the message received by the message receiving module carries no specific identifier, or directly forward the message if the message carries a specific identifier;

wherein the specific identifier is one of a user identifier of a Customer Edge (CE), an interface identifier of the UPE or a general identifier of all B-MAC addresses.

10. A User-facing Provider Edge (UPE), comprising:

a message receiving module, configured to receive a MAC Address Withdraw message;

a first address removing module, configured to remove a Backbone Media Access Control (B-MAC) address table corresponding to a Virtual Private LAN Service (VPLS) network, if the message received by the message receiving module carries no specific identifier;

a second address removing module, configured to remove a B-MAC address entry corresponding to the user identifier in a Customer Media Access Control (C-MAC) address table, if the message received by the message receiving module carries a user identifier;

a third address removing module, configured to remove a group of B-MAC address entries corresponding to the interface identifier in the C-MAC address table, if the message received by the message receiving module carries an interface identifier; and

a fourth address removing module, configured to remove B-MAC address entries corresponding to the general identifier in the C-MAC address table, if the message received by the message receiving module carries a general identifier.

11. The UPE of claim 10, further comprising:

a substitute address adding module, configured to add the substitute address for the B-MAC address to the B-MAC address entry corresponding to the user identifier, if the message received by the message receiving module (401) carries a user identifier and a substitute address for a B-MAC address.