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Mac address learning method and edge device

A technology of MAC addresses and edge devices, applied in the field of network communication, can solve the problems of wasting resources, occupying MAC entries in ED2, and wasting resources of MAC entries, etc., and achieves the effect of improving the utilization rate and reducing the occupation.

Active Publication Date: 2011-12-21
NEW H3C TECH CO LTD
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AI Technical Summary

Problems solved by technology

It can be seen that the existing MAC address learning method greatly wastes the MAC table entry resources of ED2, causing unnecessary occupation of MAC table entries in ED2, and because ED1 notifies MAC_A to ED2 through ISIS, and ED3 notifies MAC_B to ED2 through ISIS , will also waste the resources of other EDs

Method used

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  • Mac address learning method and edge device

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Embodiment Construction

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] see image 3 , image 3 The flow chart of the method provided by the embodiment of the present invention. This process is applied to a data center Layer 2 virtual internetwork that contains more than two sites. In the data center Layer 2 virtual internetwork, each ED has enabled the ARP snooping function to listen to all traffic forwarded by the ED. An ARP message, the ARP message may include: an ARP request message, an ARP response message, a gratuitous ARP message broadcast by a host where site migration occurs, etc., which are not specifically limited in the present invention.

[0042] Based on this, the steps performed by each ED include:

[0043] Step 301, listen to the ARP request message, and set up a session cache entry that inc...

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Abstract

A method and edge device for learning a Medium Access Control (MAC) address, applied in an edge device in a layer-2 virtual interconnection network of data centers. According to an example, based on an Address Resolution Protocol (ARP) request message from a first node to a second node, a session cache item is created in a control plane of the edge device. The session cache item includes: IP address of the second node, IP address of the first node, and a first relationship between a MAC address of the first node and an output port corresponding to the MAC address of the first node. Based on an ARP response message from the second node to the first node, the session cache item having the IP address of the first node and the IP address of the second node is updated. The updated session cache item further includes: a second relationship between a MAC address of the second node and an output port corresponding to the MAC address of the second node. The ARP response message is then forwarded via the output port corresponding to the MAC address of the first node in the first relationship in the session cache item. The first relationship and the second relationship are then provided to a data plane of the edge device to facilitate data packet forwarding between the first node and the second node.

Description

technical field [0001] The invention relates to network communication technology, in particular to a MAC address learning method and an edge device. Background technique [0002] In order to provide better services, providers usually deploy multiple data centers in different places to achieve load sharing and high reliability, and realize the free migration of virtual machines between data centers. Since the virtual machine migration process is transparent to the user and the IP address cannot be changed, it is necessary to implement Layer 2 virtual interconnection between data centers distributed in different places. [0003] see figure 1 , figure 1 It is a schematic diagram of the second-tier virtual interconnection network of the existing data center. exist figure 1 There are three sites in the shown network: Site 1, Site 2, and Site 3. Each site has deployed a data center, and each is connected to the IP core network through its own edge device (ED: Edge Device) to ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/12H04L45/74
CPCH04L61/103H04L49/15H04L29/12H04L12/4633H04L69/22H04L12/4641H04L61/6022H04L61/58H04L2101/622H04L45/742
Inventor 周万
Owner NEW H3C TECH CO LTD
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