WO2009033428A1 - Procédé, système et dispositif pour retirer une adresse de commande d'accès au support - Google Patents

Procédé, système et dispositif pour retirer une adresse de commande d'accès au support Download PDF

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Publication number
WO2009033428A1
WO2009033428A1 PCT/CN2008/072339 CN2008072339W WO2009033428A1 WO 2009033428 A1 WO2009033428 A1 WO 2009033428A1 CN 2008072339 W CN2008072339 W CN 2008072339W WO 2009033428 A1 WO2009033428 A1 WO 2009033428A1
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WIPO (PCT)
Prior art keywords
access control
message
control address
user
identifier
Prior art date
Application number
PCT/CN2008/072339
Other languages
English (en)
French (fr)
Inventor
Guangyu Sun
Xindong Teng
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to DE602008004845T priority Critical patent/DE602008004845D1/de
Priority to AT08800849T priority patent/ATE497665T1/de
Priority to EP08800849A priority patent/EP2190148B1/en
Publication of WO2009033428A1 publication Critical patent/WO2009033428A1/zh
Priority to US12/693,892 priority patent/US8259725B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4604LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462LAN interconnection over a bridge based backbone
    • H04L12/4625Single bridge functionality, e.g. connection of two networks over a single bridge
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/25Mapping addresses of the same type
    • H04L61/2596Translation of addresses of the same type other than IP, e.g. translation from MAC to MAC addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00Indexing scheme associated with group H04L61/00
    • H04L2101/60Types of network addresses
    • H04L2101/618Details of network addresses
    • H04L2101/622Layer-2 addresses, e.g. medium access control [MAC] addresses

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, system, and device for clearing a medium access control address. Background technique
  • VPLS Virtual Private LAN Service, Virtual Private LAN Service
  • L2VPN Layer 2 Virtual Private Network
  • MPLS Multi-Protocol Label Switching
  • Ethernet Ethernet technology.
  • VPLS can implement multi-point to multi-point VPN networking.
  • VPLS provides a more complete solution for many operators who originally used point-to-point L2VPN services, simplifying management books.
  • a PE Provider Edge
  • PW Pseudo Wire
  • H-VPLS Hierarchical VPLS, Hierarchy
  • the VPLS is only required to establish a fully connected PW between the NPE (Network Provider Edge) devices.
  • the UPE User Facing Provider Edge
  • the method can better adapt to the hierarchical network structure and facilitate the deployment of the VPLS network.
  • a carrier backbone Ethernet architecture of PBB Provide Backbone Bridges
  • the network architecture is encapsulated in a Mac-in-Mac, and a BEB (Backbone Edge Bridge) is used in a UPE device.
  • the B-MAC (Backbone Media Access Control) address of the device re-encapsulates the Ethernet packet and hides the C-MAC (Customer Media Access Control) address of the user.
  • the NPE device only needs to process according to the B-MAC address.
  • the UPE device in the above method needs to learn the correspondence between the B-MAC address and the C-MAC address through the data packet of the user.
  • the MAC address is in the MAC table. Find the corresponding C-DMAC (Customer Destination MAC) address, find the corresponding B-MAC address according to the C-DMAC address, and add the B-MAC address to the B-DMAC of the MAC table (Backbone Destination MAC) , MAC address of the backbone network) Address field.
  • the NPE device only needs to learn the B-MAC address of the UPE device, which reduces the number of learned MAC addresses of the NPE device and enhances the scalability of the H-VPLS.
  • a MAC Address Withdraw message is defined in the VPLS technology based on the LDP (Label Distribution Protocol). In a multi-homed network, when the primary and backup links are switched, the MAC address Withdraw message is used to notify the remote end of the corresponding MAC address. Clear.
  • the CE is dual-homed to UPE1 and UPE2.
  • the link between CE-UPE1 is the primary link and the link between CE-UPE2 is the standby link.
  • all the NPE devices learn only the B-MAC address on the UPE device, and the UPE device needs to learn the correspondence between the B-MAC address and the C-MAC address.
  • the link between CE-UPE1 fails, the link of CE-UPE2 switches to the active link.
  • the MAC address Withdraw message can be sent by the UPE2, and the empty MAC address table is carried.
  • the related NPE device and the UPE device in the VPLS will clear the MAC address.
  • the NPE device and the UPE device need to perform MAC address learning again.
  • the MAC Address Withdraw method defines a MAC address table that can clear the specified MAC address.
  • UPE2 is difficult to know because the CE equipment on the user side is randomly changed. All MAC addresses on the CE side. In this case, you can only carry an empty MAC address table in the MAC Address Withdraw message.
  • the device that receives the MAC Address Withdraw message will clear all MAC addresses of the corresponding VSI (Virtual Switch Instance).
  • the NPE device and the UPE device need to perform MAC address learning again.
  • the VSI is used to map the actual access link of the VPLS to each virtual link.
  • the embodiment of the present invention provides a method, system and device for clearing the medium access control address.
  • the technical solution is as follows:
  • a method for clearing a medium access control address comprising:
  • the network side provider edge device receives the message of clearing the medium access control address, and when the message does not carry the specific identifier, clears the backbone network access control address table corresponding to the virtual private local area network, and forwards the message; when the message carries a specific When the identity is identified, the message is forwarded.
  • An embodiment of the present invention further provides a system for clearing a medium access control address, where the system includes:
  • the network side provider edge device (201) is configured to receive a message for clearing the medium access control address, and when the message does not carry the specific identifier, clear the backbone network access control address table corresponding to the virtual private local area network, and forward the message; Forwarding the message when the message carries a specific identifier;
  • the user-side provider edge device (202) is configured to: after receiving the message forwarded by the network-side provider edge device (201), when the message does not carry the specific identifier, clear the backbone network media access corresponding to the virtual private local area network. Control An address table; when the message carries a specific identifier, the backbone network access control address entry corresponding to the specific identifier in the user media access control address table is cleared.
  • the embodiment of the present invention further provides a network side provider edge device, where the network side provider edge device includes:
  • a message receiving module (301), configured to receive a message for clearing a medium access control address
  • a message processing module (302) configured to: when the message received by the message receiving module (301) does not carry a specific identifier, clear a backbone network access control address table corresponding to the virtual private local area network, and forward the message; When the message carries a specific identity, the message is forwarded.
  • the embodiment of the present invention further provides a user-side provider edge device, where the user-side provider edge device includes: a message receiving module (401), configured to receive a message for clearing a medium access control address;
  • the first address clearing module (402) is configured to: when the message received by the message receiving module (401) does not carry a specific identifier, clear a backbone network access control address table corresponding to the virtual private local area network;
  • the second address clearing module (403) is configured to: when the message received by the message receiving module (401) carries the user identifier, clear the backbone network access control address table corresponding to the user identifier in the user medium access control address table.
  • the third address clearing module (404) is configured to: when the message received by the message receiving module (401) carries the interface identifier, clear a set of backbone network media corresponding to the interface identifier in the user media access control address table. Access control address table entry;
  • the fourth address clearing module (405) is configured to: when the message received by the message receiving module (401) carries the total identifier, clear the backbone network access control address table corresponding to the total identifier in the user medium access control address table. item.
  • the MAC address is cleared, the MAC address clearing operation is optimized, and the unnecessary MAC address learning of the NPE device is avoided, and the MAC address learning is reduced. causess an impact on network equipment.
  • FIG. 1 is a schematic diagram of a PBB VPLS networking provided by the prior art
  • Embodiment 2 is a packet encapsulation format provided by Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart of a method for clearing a medium access control address according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of a PBB VPLS networking provided by Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of a system for clearing a medium access control address according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of a network side provider edge device according to Embodiment 3 of the present invention.
  • FIG. 3 is a schematic diagram of a user-side provider edge device according to Embodiment 4 of the present invention.
  • the NPE device can determine whether to clear the MAC address according to the content in the message, and enable the UPE device to clear the corresponding MAC address, thereby optimizing the MAC address clearing operation, and avoiding The unnecessary MAC address learning of the NPE device and the UPE device reduces the impact on the network device caused by the MAC address learning.
  • This embodiment provides a method for clearing a media access control address, including:
  • the NPE device receives the message of clearing the MAC address, and when the message does not carry the specific identifier, clears the B-MAC address table corresponding to the VPLS, and forwards the message; when the message carries the specific identifier, the message is forwarded;
  • the UPE device After receiving the above message, the UPE device clears the B-MAC address table corresponding to the VPLS when the message does not carry the specific identifier. When the message carries the specific identifier, the B-MAC address table corresponding to the specific identifier in the C-MAC address table is cleared. item.
  • the UPE device needs to assign a user ID to the CE device connected to it. Each CE device is assigned a user ID. If a CE device is connected to two UPE devices, the two UPE devices will be assigned the same user.
  • the MPLS Header, B-DMAC, B is added to the original data packet after the UPE device receives the data packet sent by the user.
  • -SMAC Backbone Source MAC
  • B-TAG Backbone tag
  • I-TAG Instance tag
  • the B-TAG and/or the I-TAG field are used to identify the user to be accessed, that is, the user identifier.
  • the bit can carry a specific identifier, such as the user identifier of the CE device or the interface identifier of the UPE device.
  • a group of CE devices on the interface which can also be other specific characters, as the total identifier of all B-MAC addresses, used to indicate all CE devices connected to the UPE device.
  • B-DMAC is used to indicate the destination B-MAC address of the message
  • B-SMAC is used to indicate the source B-MAC address of the packet, that is, the MAC address of the UPE device.
  • the UPE device When the UPE device performs C-MAC learning, it needs to record the B-MAC address and user ID corresponding to each C-MAC address for the packets on the network side.
  • the MAC address learning After the MAC address learning is complete, there are two MAC address tables on the UPE device, namely a B-MAC address table and a C-MAC address table, and a B-MAC address table on the NPE device.
  • the B-MAC address table is a correspondence between the B-MAC address and the egress
  • the C-MAC address table is a correspondence between the C-MAC, the B-MAC, and the specific identifier of the corresponding user.
  • subsequent forwarding for a known destination C-MAC, it is forwarded from the egress of the corresponding B-MAC table.
  • the method for clearing a MAC address includes:
  • Step 101 The new primary UPE device sends a message for clearing the MAC address when the specific user network changes.
  • the new primary UPE device will notify other devices to clear the corresponding MAC address.
  • the LDP MAC Address withdraw message is used to notify other devices to clear.
  • the corresponding MAC address is placed in the notification message as the additional attribute of the corresponding user.
  • the backbone network is faulty, the user ID is not carried in the LDP MAC Address withdraw message.
  • Step 102 After receiving the message of clearing the MAC address, the NPE device determines whether the message carries a specific identifier. When the message does not carry the specific identifier, step 103 is performed. When the message carries the specific identifier, step 104 is performed.
  • Step 103 Clear the corresponding B-MAC address table in the VPLS, and then perform step 104.
  • Step 104 Forward a message for clearing the MAC address to the LDP neighbor.
  • Step 105 After receiving the message of clearing the MAC address forwarded by the NPE device, the other UPE device determines whether the message carries a specific identifier. When the message does not carry the specific identifier, step 106 is performed; when the message carries the specific identifier, Execute step 107.
  • Step 106 Clear the corresponding B-MAC address table in the VPLS.
  • Step 107 Clear the B-MAC entry corresponding to the specific identifier in the C-MAC address table.
  • the PBB VPLS network shown in Figure 4 is used as an example.
  • CE1, CE2, CE3, and CE4 are in the same VPLS instance.
  • CE1, CE2, and CE3 are connected to UPE1 and UPE2, respectively.
  • CE4 is connected to UPE3.
  • UPE1 and UPE2 are connected to NPE1 and NPE2 through the PW branch, and a fully connected PW is established between NPE1, NPE2, NPE3, and NPE4.
  • UPE1 and UPE2 are configured with user IDs Cl, C2, and C3 for CE1, CE2, and CE3.
  • Use CE1 and CE2 to select UPE1 as the primary device, and CE3 to select UPE2 as the primary device.
  • the two users are connected to CE1.
  • the C-MAC addresses are MAC1 and MAC2 respectively.
  • CE2 One user is connected to CE2 and its C-MAC address is used.
  • CE3 is connected to 'users', and its C-MAC address is MAC4.
  • the C-MAC address table learned by UPE3 is shown in Table 1.
  • the learned B-MAC address table is shown in Table 2.
  • the link between CE1 and UPE1 is faulty.
  • the packet sent by CE1 is switched to the link connected to UPE2.
  • UPE2 sends a message to clear the MAC address.
  • the user identifier is added to the MAC Address Withdraw packet.
  • a field through which the user identifier C1 of the CE1 is carried.
  • the NPE2 After receiving the MAC Address Withdraw packet, the NPE2 forwards the MAC Address Withdraw packet to the LDP neighbor, and does not perform the local B-MAC address clearing operation.
  • the UPE3 When the UPE3 receives the MAC Address Withdraw message with the user ID, it clears the entry in the C-MAC address table that matches the user ID, that is, the entry corresponding to the user ID C1.
  • the cleared C-MAC address table is as shown in the table. 3 is shown.
  • the above user IDs may also specify a group of users, such as all VSI sites (virtual private Ethernet access sites) on the specified link, or all CE devices in a VPLS, and the corresponding UPE devices are cleared according to the specified user.
  • the specific identifier carried in the message of the MAC address deletes the corresponding entry.
  • the above method may further carry the original B-MAC field and the substitute B-MAC field while the message of the MAC address is carried, and the UPE device that receives the message finds the corresponding entry according to the user identifier, and clears the entry.
  • the original B-MAC is added to replace the B-MAC. Table 1 is used as an example.
  • the message received by UPE3 carries the user IDs Cl, MACup E-1, and MACup E _ 2
  • the original user ID C1 corresponds to the entry.
  • Replaced with MACup E-2 the replaced C-MAC address table is shown in Table 4.
  • the MAC address Withdraw is triggered by the NPE, without any user ID.
  • the other NPE devices need to clear the B-MAC address table. .
  • the UPE device only deletes the B-MAC address table, and does not delete the correspondence between the C-MAC and the B-MAC in the C-MAC address table.
  • the impact range of the network topology change can be reduced.
  • the NPE is not affected at all, and the UPE only clears the change for the user.
  • the MAC address can be used to reserve other MAC address learning entries, thus avoiding the process of re-learning the MAC address of these irrelevant entries, saving network bandwidth and reducing the impact on network devices.
  • an alternate B-MAC address can be added to the message, so that the unrelated entries are not affected, and the affected entries are not completely cleared, but the original B-MAC is directly modified into an alternate B-MAC. The impact of network topology changes on network devices is reduced.
  • this embodiment provides a system for clearing a media access control address, including:
  • the network side provider edge device 201 is configured to receive a message for clearing the medium access control address, and when the message does not carry the specific identifier, clear the backbone medium access control address table corresponding to the virtual private local area network, and forward the message; when the message carries the specific identifier , forwarding the message;
  • the user-side provider edge device 202 is configured to: after receiving the message forwarded by the network-side provider edge device 201, when the message does not carry the specific identifier, clear the backbone network access control address table corresponding to the virtual private local area network; During the identification, the backbone network access control address entry corresponding to the specific identifier in the user media access control address table is cleared.
  • the specific identifier is: a user identifier of the user side device
  • User side provider edge device 202 includes:
  • a message receiving module configured to receive a message forwarded by the network side provider edge device 201;
  • a first address clearing module configured to: when the message received by the message receiving module does not carry a specific identifier, clear a backbone network access control address table corresponding to the virtual private local area network;
  • a second address clearing module configured to: when the message received by the message receiving module carries the user identifier, clear a backbone network access control address entry corresponding to the user identifier in the user media access control address table;
  • the third address clearing module is configured to: when the message received by the message receiving module carries the interface identifier, clear a set of backbone network access control address entries corresponding to the interface identifier in the user media access control address table;
  • the fourth address clearing module is configured to: when the message received by the message receiving module carries the total identifier, clear the backbone network access control address entry corresponding to the total identifier in the user medium access control address table.
  • the user side provider edge device 202 further includes:
  • the substitute address adding module is configured to: when the message received by the message receiving module carries the user identifier and the substitute address of the backbone medium access control address, clear the backbone network access control address entry corresponding to the user identifier in the user media access control address table , an alternate address added to the backbone network access control address.
  • the NPE device can determine whether to clear the MAC address according to the content in the message, and enable the UPE device to clear the corresponding MAC address, thereby optimizing the MAC address clearing operation and avoiding the NPE. Unnecessary MAC address learning of the device and the UPE device reduces the impact on the network device caused by MAC address learning.
  • the embodiment provides a network side provider edge device.
  • the network side provider edge device provided in this embodiment may be used in the network side provider edge device in the system provided in the foregoing Embodiment 2, and includes:
  • a message receiving module 301 configured to receive a message for clearing a medium access control address
  • the message processing module 302 when the message received by the message receiving module 301 does not carry the specific identifier, clears the backbone network access control address table corresponding to the virtual private local area network, and forwards the message; when the message carries the specific identifier, the message is forwarded.
  • the NPE device determines whether to clear according to whether the message that clears the MAC address carries a specific identifier.
  • the MAC address is optimized to eliminate the unnecessary MAC address learning of the NPE device and reduce the impact of the MAC address learning on the NPE device.
  • the embodiment provides a user-side provider edge device.
  • the user-side provider edge device provided in this embodiment may be used in the user-side provider edge device in the system provided in the foregoing Embodiment 2, and includes:
  • a message receiving module 401 configured to receive a message for clearing a medium access control address
  • the first address clearing module 402 is configured to: when the message received by the message receiving module 401 does not carry the specific identifier, clear the backbone network access control address table corresponding to the virtual private local area network;
  • the second address clearing module 403 is configured to: when the message received by the message receiving module 401 carries the user identifier, clear the backbone network access control address entry corresponding to the user identifier in the user media access control address table;
  • the third address clearing module 404 is configured to: when the message received by the message receiving module 401 carries the interface identifier, clear A set of backbone network access control address entries corresponding to the interface identifiers in the user media access control address table; the fourth address clearing module 405 is configured to clear the user media access control when the message received by the message receiving module 401 carries the total identifier The backbone network access control address entry corresponding to the total identifier in the address table.
  • the user side provider edge device further includes:
  • the substitute address adding module is configured to: when the message received by the message receiving module 401 carries the user identifier and the substitute address of the backbone medium access control address, clear the backbone network access control address table corresponding to the user identifier in the user media access control address table Item, an alternate address added to the backbone media access control address.
  • the UPE device clears the corresponding MAC address according to whether the message that clears the MAC address carries the specific identifier and the type of the specific identifier, optimizes the MAC address clearing operation, and avoids unnecessary MAC address learning of the UPE device, thereby reducing the cause.
  • the original B-MAC can be directly modified into an alternate B-MAC, which further reduces the impact of network topology changes on the UPE device.
  • All or part of the steps in the embodiments of the present invention may be completed by an instruction to control the corresponding hardware, and the instructions may be stored in a readable storage medium, such as a computer hard disk or a memory.

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  • Computer Networks & Wireless Communication (AREA)
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Description

清除介质访问控制地址的方法、 系统和设备 技术领域
本发明涉及通信领域, 特别涉及一种清除介质访问控制地址的方法、 系统和设备。 背景技术
VPLS ( Virtual Private LAN说 Service, 虚拟专用局域网服务) 是一种基于 MPLS (Multi-Protocol Label Switching,多协议标签交换)和以太网技术的 L2VPN (Layer 2 Virtual Private Network, 二层虚拟专用网) 技术。 VPLS可以实现多点到多点的 VPN组网, VPLS 为许多原来使用点到点 L2VPN业务的运营商提供了一种更完备的解决方案, 可以简化管理 书
用户内部的路由信息。
在 VPLS组网中一般要求 PE (Provider Edge, 提供商边缘) 设备之间建立全连接 PW (Pseudo wire, 伪链路), 这种方法不利于网络的扩展; 而 H- VPLS (Hierarchical VPLS, 层 次化的 VPLS ) 只要求 NPE (Network Provider Edge, 网络侧提供商边缘) 设备之间建立全 连接 PW, UPE (User Facing Provider Edge, 用户侧提供商边缘)设备只需连接到 NPE设备 上, 这种方法可以更好适应层次化的网络结构, 易于 VPLS网络的部署。
现有技术中提供了一种 PBB (Provider Backbone Bridges, 网络提供商骨干网桥) 的运 营商骨干以太网架构,该网络架构通过 Mac-in-Mac封装,在 UPE设备用 BEB( Backbone Edge Bridge, 骨干网边缘网桥) 设备的 B-MAC (Backbone Media Access Control, 骨干网介质访 问控制) 地址重新封装以太网报文, 隐藏用户的 C-MAC (Customer Media Access Control, 用户介质访问控制) 地址, NPE设备只需要按照 B-MAC地址进行处理。
上述方法中的 UPE设备需要通过用户的数据报文学习 B-MAC地址和 C-MAC地址的对 应关系, 当收到 CE (Customer Edge, 用户侧) 设备发来的报文时, 在 MAC表中, 找到对 应的 C-DMAC (Customer Destination MAC, 用户目的 MAC)地址, 根据 C-DMAC地址找 到对应的 B-MAC地址,将该 B-MAC地址添添到 MAC表的 B-DMAC( Backbone Destination MAC, 骨干网目的 MAC) 地址域。 NPE设备只需学习 UPE设备的 B-MAC地址, 縮减了 NPE设备学习 MAC地址的数量, 增强了 H-VPLS的扩展性。 同时, 当用户侧网络发生变动 时, B-MAC地址的位置不变, NPE设备不需要重新学习 MAC地址, 减少了不必要的报文 对网络的冲击。 基于 LDP ( Label Distribution Protocol, 标签分配协议) 的 VPLS技术中定义了 MAC Address Withdraw消息, 在多归属的网络中, 当主备链路发生切换时, 通过 MAC Address Withdraw消息通知远端进行相应的 MAC地址清除。
参见图 1, CE双归连接到 UPE1和 UPE2 , 其中, CE-UPE1之间的链路为主用链路, CE-UPE2之间的链路为备用链路。 此时在相应的 VPLS内, 所有 NPE设备只学习 UPE设 备上的 B-MAC地址, 而 UPE设备需要学习 B-MAC地址与 C-MAC地址的对应关系。 当 CE-UPE1之间的链路发生故障时, CE-UPE2的链路切换为主用链路。 此时可以由 UPE2发 送 MAC Address Withdraw消息, 并携带空的 MAC地址表, 该 VPLS内的相关 NPE设备和 UPE设备将清空 MAC地址。 NPE设备和 UPE设备需要重新进行 MAC地址学习。
另夕卜,上述 MAC Address Withdraw方法中定义了一种可以清除指定 MAC地址的 MAC 地址表, 但在图 1所示的组网中, 因为用户侧的 CE设备是随机变化的, UPE2很难知道 CE 侧的所有 MAC地址, 这种情况下只能在 MAC Address Withdraw消息中携带空的 MAC地 址表。 收到 MAC Address Withdraw消息的设备将清除相应 VSI ( Virtual Switch Instance, 虚 拟交换实例) 的所有 MAC地址。 NPE设备和 UPE设备需要重新进行 MAC地址学习。 其 中, VSI用于将 VPLS的实际接入链路映射到各条虚链接上。
在实现本发明的过程中,发明人发现 NPE设备和 UPE设备进行 MAC地址学习过程中, 将会有大量的单播报文复制, 对网络造成冲击。 发明内容
为了合理地清除 MAC地址, 降低冈 MAC地址学 所引起对网络设备的冲击, 本发明 实施例提供了一种清除介质访问控制地址的方法、 系统和设备。 所述技术方案如下:
一种清除介质访问控制地址的方法, 所述方法包括:
网络侧提供商边缘设备接收清除介质访问控制地址的消息, 当所述消息没有携带特定 标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 转发所述消息; 当所述 消息携带特定标识时, 转发所述消息。
本发明实施例还提供了 ·种清除介质访问控制地址的系统, 所述系统包括:
网络侧提供商边缘设备 (201 ), 用于接收清除介质访问控制地址的消息, 当所述消息 没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 转发所述 消息; 当所述消息携带特定标识时, 转发所述消息;
用户侧提供商边缘设备 (202), 用于收到所述网络侧提供商边缘设备 (201 ) 转发的消 息后, 当所述消息没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制 地址表; 当所述消息携带特定标识时, 清除用户介质访问控制地址表中所述特定标识对应 的骨干网介质访问控制地址表项。
进 ·歩地, 本发明实施例还提供了 ·种网络侧提供商边缘设备, 所述网络侧提供商边 缘设备包括:
消息接收模块 (301 ), 用于接收清除介质访问控制地址的消息;
消息处理模块 (302), 用于当所述消息接收模块 (301 ) 接收的消息没有携带特定标识 时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 并转发所述消息; 当所述消 息携带特定标识时, 转发所述消息。
本发明实施例还提供了一种用户侧提供商边缘设备, 所述用户侧提供商边缘设备包括: 消息接收模块 (401 ), 用于接收清除介质访问控制地址的消息;
第一地址清除模块 (402), 用于当所述消息接收模块 (401 ) 接收到的消息没有携带特 定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表;
第二地址清除模块 (403 ), 用于当所述消息接收模块 (401 ) 接收到的消息携带用户标 识时, 清除用户介质访问控制地址表中所述用户标识对应的骨干网介质访问控制地址表项; 第三地址清除模块 (404), 用于当所述消息接收模块 (401 ) 接收到的消息携带接口标 识时, 清除用户介质访问控制地址表中所述接口标识对应的一组骨干网介质访问控制地址 表项;
第四地址清除模块 (405 ), 用于当所述消息接收模块 (401 ) 接收到的消息携带总标识 时, 清除用户介质访问控制地址表中所述总标识对应的骨干网介质访问控制地址表项。
本发明实施例提供的技术方案的有益效果是:
本发明实施例通过在清除 MAC地址的消息中加入特定标识, 防止 NPE设备不必要的 MAC地址清除, 优化了 MAC地址清除操作, 避免了 NPE设备不必要的 MAC地址学习, 降低因 MAC地址学习所引起对网络设备的冲击。 附图说明
图 1是现有技术提供的 PBB VPLS组网示意图;
图 2是本发明实施例 1提供的报文封装格式;
图 3是本发明实施例 1提供的清除介质访问控制地址的方法流程图;
图 4是本发明实施例 1提供的 PBB VPLS组网示意图;
图 5是本发明实施例 2提供的清除介质访问控制地址的系统示意图;
图 6是本发明实施例 3提供的网络侧提供商边缘设备示意图; 图 Ί是本发明实施例 4提供的用户侧提供商边缘设备示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明实施方式作 进一歩地详细描述。
本发明实施例通过在清除 MAC地址的消息中加入特定标识, 使 NPE设备能够根据消 息中的内容决定是否清除 MAC地址,以及使 UPE设备清除对应的 MAC地址,优化了 MAC 地址清除操作, 避免了 NPE设备和 UPE设备不必要的 MAC地址学习, 降低因 MAC地址 学习所引起对网络设备的冲击。
实施例 1
本实施例提供了一种清除介质访问控制地址的方法, 包括:
NPE设备接收清除 MAC地址的消息, 当该消息没有携带特定标识时,清除 VPLS对应 的 B-MAC地址表, 转发该消息; 当该消息携带特定标识时, 转发该消息;
UPE设备收到上述消息后, 当消息没有携带特定标识时,清除 VPLS对应的 B-MAC地 址表;当消息携带特定标识时,清除 C-MAC地址表中该特定标识对应的 B-MAC地址表项。
为了实现上述方法, UPE设备需要为与其相连的 CE设备分配用户标识, 每个 CE设备 分配一个用户标识, 如果一个 CE设备与两个 UPE设备相连, 这两个 UPE设备将为其分配 同样的用户标识, UPE设备通过用户发送的数据报文进行 MAC地址的学习,本实施例中的 UPE设备收到用户发送的数据报文后, 在原来的数据报文上增加 MPLS Header, B-DMAC、 B-SMAC (Backbone Source MAC, 骨干网源 MAC)、 B-TAG (Backbone tag, 骨干网标签)、 I-TAG (Instance tag, 实例标签) 等字段。
增加上述字段后的报文的封装格式参见图 2, 其中, MPLS Header用来标识 VPLS, 表 明此报文来自哪 个¥?1^;
B-TAG和 (或) I-TAG域用来标识接入的用户, 即用户标识位, 该位可以携带特定标 识, 例如: CE设备的用户标识, 或者 UPE设备的接口标识, 用以表示该接口下的一组 CE 设备, 也可以是其它特定字符, 作为所有 B-MAC地址的总标识, 用以表示与 UPE设备所 相连的所有 CE设备;
B-DMAC用来表示报文的目的 B-MAC地址;
B-SMAC用来表示报文的源 B-MAC地址, 即本 UPE设备的 MAC地址;
UPE设备进行 C-MAC学习时, 对于网络侧的报文, 需要同时记录每个 C-MAC地址对 应的 B-MAC地址和用户标识。 完成 MAC地址的学习后, 在 UPE设备上有两个 MAC地址表, 分别为 B-MAC地址表 和 C-MAC地址表, 在 NPE设备上有一个 B-MAC地址表。其中, B-MAC地址表为 B-MAC 地址与出口的对应关系, C-MAC地址表为 C-MAC、 B-MAC和对应用户的特定标识间的对 应关系。 在后续转发中, 对于已知的目的 C-MAC, 从对应 B-MAC表的出口转发。
参见图 3, 本实施例提供的清除 MAC地址的方法具体包括:
歩骤 101:新的主用 UPE设备感知到特定用户网络变化时,发送清除 MAC地址的消息。 当接入侧拓扑发生变化或者由于运营商网络变化导致接入侧切换时, 新的主用 UPE设 备将会通知其它设备清除相应的 MAC地址, 本实施例采用 LDP MAC Address withdraw消 息通知其它设备清除相应的 MAC地址,将对应用户的特定标识作为附加的属性放在通知消 息中。 当为骨干网故障时, 在 LDP MAC Address withdraw消息中不携带用户标识。
歩骤 102: NPE设备收到清除 MAC地址的消息后, 判断消息中是否携带特定标识, 当 消息中没有携带特定标识时, 执行歩骤 103; 当消息中携带特定标识时, 执行歩骤 104。
歩骤 103 : 清除 VPLS中对应的 B-MAC地址表, 然后执行歩骤 104。
歩骤 104: 向 LDP邻居转发清除 MAC地址的消息。
歩骤 105 : 其它 UPE设备收到 NPE设备转发的清除 MAC地址的消息后, 判断消息中 是否携带特定标识, 当消息中没有携带特定标识时, 执行歩骤 106; 当消息中携带特定标识 时, 执行歩骤 107。
歩骤 106: 清除 VPLS中对应的的 B-MAC地址表。
歩骤 107: 在 C-MAC地址表中清除特定标识对应的 B-MAC表项。
以图 4提供的 PBB VPLS组网为例, CE1、 CE2、 CE3和 CE4 于同 '个 VPLS实例, 其中, CE1、 CE2和 CE3分别双归连接到 UPE1和 UPE2, CE4与 UPE3相连。 UPE1和 UPE2分别通过 PW分支接入 NPE1和 NPE2, NPE1、 NPE2、 NPE3和 NPE4之间建立全连 接 PW。 UPE1和 UPE2分别为 CE1、 CE2和 CE3配置用户标识 Cl、 C2、 C3。 以 CE1、 CE2 选择 UPE1作为主用设备, CE3选择 UPE2作为主用设备为例, CE1上连接两个用户, 其 C-MAC地址分别为 MAC1和 MAC2, CE2上连接一个用户,其 C-MAC地址为 MAC3, CE3 上连接 '个用户, 其 C-MAC地址为 MAC4, UPE3学习到的 C-MAC地址表如表 1所示, 学习到的 B-MAC地址表如表 2所示。
表 1
C-MAC B-MAC 特定标识
MAC1 MACUPE-1 C1
MAC2 MACUPE-I C1 MAC3 MACUPE-1 C2
MAC4 MACupE-2 C3 表 2
Figure imgf000008_0002
以 CE1与 UPE1之间的链路出现故障, CE1发送的报文切换到与 UPE2相连的链路上 为例, UPE2将发送清除 MAC地址的消息,具体通过在 MAC Address Withdraw报文中增加 用户标识字段, 通过该用户标识字段携带 CE1的用户标识 Cl。
NPE2收到 MAC Address Withdraw报文后, 由于报文中携带用户标识 C1, 则只向 LDP 邻居转送此 MAC Address Withdraw报文, 不进行本地 B-MAC地址的清除操作;
UPE3收到带有用户标识的 MAC Address Withdraw报文时,则清除 C-MAC地址表中与 用户标识匹配的表项, 即用户标识 C1对应的表项, 清除后的 C-MAC地址表如表 3所示。
表 3
Figure imgf000008_0003
上述清除用户标识 C1对应的表项时,也可以不删除一整条记录,只删除对应的 B-MAC 表项。
上述用户标识也可以不指定一个特定用户,指定一组用户,如指定链路上的所有 VSI site (虚拟私有以太网接入站点), 或者一个 VPLS中的所有 CE设备, 相应的 UPE设备根据清 除 MAC地址的消息中携带的特定标识删除相应的表项。
上述方法也可以在清除 MAC地址的消息携带用户标识的同时,进一歩携带原始 B-MAC 字段和替代 B-MAC字段, 收到此消息的 UPE设备根据用户标识找到对应表项, 清除该表 项中的原始 B-MAC, 添入替代 B-MAC。 以表 1为例, 当 UPE3收到的消息中携带用户标识 Cl、 MACupE-1和 MACupE_2时, 将原来用户标识 C1 对应的表项中的
Figure imgf000008_0001
替换为 MACupE-2, 替换后的 C-MAC地址表如表 4所示。
表 4
C-MAC B-MAC 特定标识
MAC1 MACupE-2 C1
MAC2 MACupE-2 C1 MAC3 MACUPE-1 C2
MAC4 MACupE-2 C3 对于运营商网络的拓扑变化, 由 NPE触发 MAC Address Withdraw, 不带有任何用户标 识, 此时其他 NPE设备收到 MAC Address Withdraw后, 需要进行 B-MAC地址表的清除操 作。 而 UPE设备则只删除 B-MAC地址表, 不删除 C-MAC地址表中 C-MAC与 B-MAC的 对应关系。
本实施例通过在清除 MAC地址的消息中加入特定标识,可以降低网络拓扑变化的影响 范围, 在某一用户侧网络变化时, NPE不受任何影响, 同时 UPE只针对这一用户的变化清 除相应的 MAC地址, 可以使其他的 MAC地址学习表项得以保留, 从而避免这些无关的表 项重新学习 MAC地址的过程, 节约了网络带宽, 并减少了对网络设备的冲击。 另外, 还可 以在消息中增加替代 B-MAC地址, 这样既不会影响无关表项, 受到影响的表项也不用全部 清除, 而是直接将原 B-MAC修改为替代的 B-MAC, 进一歩降低了网络拓扑变化对网络设 备的影响。
实施例 2
参见图 5, 本实施例提供了一种清除介质访问控制地址的系统, 包括:
网络侧提供商边缘设备 201, 用于接收清除介质访问控制地址的消息, 当消息没有携带 特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 转发消息; 当消息 携带特定标识时, 转发消息;
用户侧提供商边缘设备 202, 用于收到网络侧提供商边缘设备 201转发的消息后, 当消 息没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表; 当消息 携带特定标识时, 清除用户介质访问控制地址表中特定标识对应的骨干网介质访问控制地 址表项。
其中, 特定标识为: 用户侧设备的用户标识;
或, 用户侧提供商边缘设备 202的接口标识;
或, 所有骨干网介质访问控制地址的总标识。
用户侧提供商边缘设备 202包括:
消息接收模块, 用于接收网络侧提供商边缘设备 201转发的消息;
第一地址清除模块, 用于当消息接收模块接收到的消息没有携带特定标识时, 清除虚 拟专用局域网对应的骨干网介质访问控制地址表;
第二地址清除模块, 用于当消息接收模块接收到的消息携带用户标识时, 清除用户介 质访问控制地址表中用户标识对应的骨干网介质访问控制地址表项; 第三地址清除模块, 用于当消息接收模块接收到的消息携带接口标识时, 清除用户介 质访问控制地址表中接口标识对应的一组骨干网介质访问控制地址表项;
第四地址清除模块, 用于当消息接收模块接收到的消息携带总标识时, 清除用户介质 访问控制地址表中总标识对应的骨干网介质访问控制地址表项。
进一歩地, 用户侧提供商边缘设备 202还包括:
替代地址添加模块, 用于当消息接收模块接收到的消息携带用户标识和骨干网介质访 问控制地址的替代地址时, 清除用户介质访问控制地址表中用户标识对应的骨干网介质访 问控制地址表项, 添入骨干网介质访问控制地址的替代地址。
本实施例通过在清除 MAC地址的消息中加入特定标识, 使 NPE设备能够根据消息中 的内容决定是否清除 MAC地址, 以及使 UPE设备清除对应的 MAC地址,优化了 MAC地 址清除操作, 避免了 NPE设备和 UPE设备不必要的 MAC地址学习, 降低因 MAC地址学 习所引起对网络设备的冲击。
实施例 3
参见图 6, 本实施例提供了一种网络侧提供商边缘设备, 本实施例提供的网络侧提供商 边缘设备可以用于上述实施例 2提供的系统中的网络侧提供商边缘设备, 包括:
消息接收模块 301, 用于接收清除介质访问控制地址的消息;
消息处理模块 302, 用十当消息接收模块 301接收的消息没有携带特定标识时, 清除虚 拟专用局域网对应的骨干网介质访问控制地址表, 并转发消息; 当消息携带特定标识时, 转发消息。
本实施例中, NPE设备根据清除 MAC地址的消息中是否携带特定标识来决定是否清除
MAC地址, 优化了 MAC地址清除操作, 避免了 NPE设备不必要的 MAC地址学习, 降低 因 MAC地址学习对 NPE设备造成的冲击。
实施例 4
参见图 7, 本实施例提供了一种用户侧提供商边缘设备, 本实施例提供的用户侧提供商 边缘设备可以用于上述实施例 2提供的系统中的用户侧提供商边缘设备, 包括:
消息接收模块 401, 用于接收清除介质访问控制地址的消息;
第一地址清除模块 402, 用于当消息接收模块 401接收到的消息没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表;
第二地址清除模块 403, 用于当消息接收模块 401接收到的消息携带用户标识时, 清除 用户介质访问控制地址表中用户标识对应的骨干网介质访问控制地址表项;
第三地址清除模块 404, 用于当消息接收模块 401接收到的消息携带接口标识时, 清除 用户介质访问控制地址表中接口标识对应的一组骨干网介质访问控制地址表项; 第四地址清除模块 405, 用于当消息接收模块 401接收到的消息携带总标识时, 清除用 户介质访问控制地址表中总标识对应的骨干网介质访问控制地址表项。
进一歩地, 该用户侧提供商边缘设备还包括:
替代地址添加模块, 用于当消息接收模块 401 接收到的消息携带用户标识和骨干网介 质访问控制地址的替代地址时, 清除用户介质访问控制地址表中用户标识对应的骨干网介 质访问控制地址表项, 添入骨干网介质访问控制地址的替代地址。
本实施例中, UPE设备根据清除 MAC地址的消息中是否携带特定标识以及特定标识的 类型来清除相应的 MAC地址,优化了 MAC地址清除操作,避免了 UPE设备不必要的 MAC 地址学习,降低因 MAC地址学习对 UPE设备造成的冲击。另外,当消息中携带替代 B-MAC 地址时, 可以直接将原 B-MAC修改为替代的 B-MAC, 进一歩降低了网络拓扑变化对 UPE 设备的影响。
本发明实施例中的全部或部分歩骤可以通过指令控制相应的硬件完成, 该指令可以存 储于可读取的存储介质中, 例如, 计算机硬盘或内存。
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的精神和原则 之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1 -一种清除介质访问控制地址的方法, 其特征在于, 所述方法包括:
网络侧提供商边缘设备接收清除介质访问控制地址的消息, 当所述消息没有携带特定 标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 转发所述消息; 当所述 消息携带特定标识时, 转发所述消息。
2. 如权利要求 1所述的清除介质访问控制地址的方法, 其特征在于, 所述方法进一歩 包括:
用户侧提供商边缘设备收到所述网络侧提供商边缘设备转发的消息后, 当所述消息没 有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表; 当所述消息 携带特定标识时, 清除用户介质访问控制地址表中所述特定标识对应的骨干网介质访问控 制地址表项。
3. 如权利要求 1或 2所述的清除介质访问控制地址的方法, 其特征在于, 所述特定标 识为:
用户侧设备的用户标识;
或, 用户侧提供商边缘设备的接口标识;
或, 所有骨干网介质访问控制地址的总标识。
4. 如权利要求 2所述的清除介质访问控制地址的方法, 其特征在于, 当所述消息携带 用户标识和骨干网介质访问控制地址的替代地址时, 所述清除用户介质访问控制地址表中 所述特定标识对应的骨干网介质访问控制地址表项之后还包括:
在所述用户标识对应的骨干网介质访问控制地址表项中添入所述骨干网介质访问控制 地址的替代地址。
5.一种清除介质访问控制地址的系统, 其特征在于, 所述系统包括:
网络侧提供商边缘设备 (201 ), 用于接收清除介质访问控制地址的消息, 当所述消息 没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 转发所述 消息; ¾所述消息携带特定标识时, 转发所述消息;
用户侧提供商边缘设备 (202), 用于收到所述网络侧提供商边缘设备 (201 ) 转发的消 息后, 当所述消息没有携带特定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制 地址表; 当所述消息携带特定标识时, 清除用户介质访问控制地址表中所述特定标识对应 的骨干网介质访问控制地址表项。
6. 如权利要求 5所述的清除介质访问控制地址的系统, 其特征在于, 所述特定标识为: 用户侧设备的用户标识;
或, 用户侧提供商边缘设备的接口标识;
或, 所有骨干网介质访问控制地址的总标识。
7. 如权利要求 6所述的清除介质访问控制地址的系统, 其特征在于, 所述用户侧提供 商边缘设备 (202 ) 包括:
消息接收模块, 用于接收所述网络侧提供商边缘设备 (201 ) 转发的消息;
第一地址清除模块, 用于当所述消息接收模块接收到的消息没有携带特定标识时, 清 除虚拟专用局域网对应的骨干网介质访问控制地址表;
第二地址清除模块, 用于当所述消息接收模块接收到的消息携带用户标识时, 清除用 户介质访问控制地址表中所述用户标识对应的骨干网介质访问控制地址表项;
第三地址清除模块, 用十当所述消息接收模块接收到的消息携带接 U标识时, 清除用 户介质访问控制地址表中所述接口标识对应的一组骨干网介质访问控制地址表项;
第四地址清除模块, 用于当所述消息接收模块接收到的消息携带总标识时, 清除用户 介质访问控制地址表中所述总标识对应的骨干网介质访问控制地址表项。
8. 如权利要求 7所述的清除介质访问控制地址的系统, 其特征在于, 所述用户侧提供 商边缘设备 (202 ) 还包括:
替代地址添加模块, 用于当所述消息接收模块接收到的消息携带用户标识和骨干网介 质访问控制地址的替代地址时, 在所述用户标识对应的骨干网介质访问控制地址表项中添 入所述骨干网介质访问控制地址的替代地址。
9. 一种网络侧提供商边缘设备, 其特征在于, 所述网络侧提供商边缘设备包括: 消息接收模块 (301 ), 用于接收清除介质访问控制地址的消息;
消息处理模块 (302), 用于当所述消息接收模块 (301 ) 接收的消息没有携带特定标识 时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表, 并转发所述消息; 当所述消 息携带特定标识时, 转发所述消息
10. ·种用户侧提供商边缘设备, 其特征在于, 所述用户侧提供商边缘设备包括: 消息接收模块 (401 ), 用于接收清除介质访问控制地址的消息;
第一地址清除模块 (402), 用于当所述消息接收模块 (401 ) 接收到的消息没有携带特 定标识时, 清除虚拟专用局域网对应的骨干网介质访问控制地址表;
第二地址清除模块 (403 ), 用于当所述消息接收模块 (401 ) 接收到的消息携带用户标 识时, 清除用户介质访问控制地址表中所述用户标识对应的骨干网介质访问控制地址表项; 第三地址清除模块 (404), 用于当所述消息接收模块 (401 ) 接收到的消息携带接口标 识时, 清除用户介质访问控制地址表中所述接口标识对应的一组骨干网介质访问控制地址 表项;
第四地址清除模块 (405 ), 用于当所述消息接收模块 (401 ) 接收到的消息携带总标识 时, 清除用户介质访问控制地址表中所述总标识对应的骨干网介质访问控制地址表项。
11. 如权利要求 10所述的用户侧提供商边缘设备, 其特征在于, 所述用户侧提供商边 缘设备还包括:
替代地址添加模块, 用十当所述消息接收模块 (401 ) 接收到的消息携带用户标识和骨 干网介质访问控制地址的替代地址时, 在所述用户标识对应的骨干网介质访问控制地址表 项中添入所述骨干网介质访问控制地址的替代地址。
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