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SDN layer-2 forwarding method and system

A two-layer forwarding and forwarding table technology, applied in the field of computer networks, can solve the problems of overloading the controller, consuming storage resources, affecting the performance of table lookup, etc., and achieves the effect of reducing difficulty and workload, reducing storage space, and reducing scale

Active Publication Date: 2017-09-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-order host IPMAC address forwarding table not only consumes the storage resources of TSW, but more importantly, affects the performance of the table lookup and increases the cost of maintaining and managing a large number of host MAC address forwarding tables.
The number of tables on the switch has skyrocketed. When the host goes offline or migrates, a large number of flow tables need to be updated, which may easily cause the controller to be overloaded, and does not reflect the advantages brought by network virtualization.

Method used

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  • SDN layer-2 forwarding method and system

Examples

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example 1

[0073]In the communication scenario of hosts on the same network segment belonging to different WAs, before sending a Layer 3 packet, the host first checks whether it has the MAC address of the destination IP. If not, the host first sends an ARP request, and the IP address requested by the ARP message is the IP address of the destination host, and is sent to the controller on the TSW. The controller generates a globally unique Proxy MAC and sends an ARP proxy to the requesting host. The controller learns the IP address and MAC address of the host requesting ARP, calculates the path according to the SPF, sends the Layer 2 forwarding table to all switches in the path, and sends the host routing table to all CSW controllers in the path. At the same time, the controller will check whether there is an entry record of the MAC address of the ARP Request, if not, the controller will send an ARP broadcast message, and the ARP request will be broadcast on all the trunk ports of the TSW....

example 2

[0091] In instance 1, Proxy MAC is the only proxy MAC in the network topology. When the CSW queries the host routing table, it queries the host MAC address corresponding to the destination IP in the entire network host routing table. The breadth of the query is to maximize the range of queries in the host routing table. When the number of host routing tables increases sharply, the query range and difficulty also increase proportionally. Considering the two-layer optimization that reduces complexity and improves performance, Example 2 proposes a Proxy MAC that uniquely identifies a switch based on different TSWs, and the host connected to the TSW is associated with the Proxy MAC of the TSW to which it belongs. Hosts under different TSW switches use Proxy MAC, the unique identifier of the TSW to which the target host belongs. When the CSW receives the Layer 3 data packet, it can query the host routing table according to the Proxy MAC corresponding to the TSW. Precisely narrow...

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Abstract

The invention discloses an SDN layer-2 forwarding method and system. The method comprises that when performing address resolution protocol (APR) proxy reply on a source host, a controller sets a destination host media access control (MAC) address in an ARP reply sent to the source host as a proxy MAC address generated in advance; the source host and the destination host encapsulate an interaction data packet and send the interaction data packet to a switch by using the proxy MAC address as the destination host MAC address; and the switch forwards, between the source host and the destination host according to a forwarding table sent by the controller, the interaction data packet in which the proxy MAC address is encapsulated. The forwarding table is used for indicating a forwarding path for an Internal control message protocol (ICMP) layer-3 data packet in which the proxy MAC address is encapsulated. According to technical schemes of the invention, the scale of the forwarding table searched by the switch can be reduced, the performance of a table searching and forwarding message of the switch can be improved, and the difficulty and workload of maintaining the forwarding table are further reduced.

Description

technical field [0001] The invention relates to the technical field of computer networks, in particular to an SDN two-layer forwarding method and system. Background technique [0002] Software Defined Network (SDN for short) is a hot research technology in the current communication field. The SDN consists of two parts: a controller (Controller, C for short) on the control plane and a switch (Switch, SW or S for short) on the forwarding plane. According to the current definition of SDN technology, the Controller and the switch Switch issue control instructions through the OPENFLOW (OF) protocol to guide the data flow forwarding on the switch; the controller also uses the Network Configuration Protocol (Netconfig) to configure Parameter configuration etc. are performed on the switch SW. Among them, the OF protocol is a forwarding / control separation protocol proposed by Stanford University in the United States in 2008. The external control plane entity uses the OF protocol to...

Claims

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Application Information

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IPC IPC(8): H04L12/721H04L12/741H04L45/74
CPCH04L45/54H04L45/66H04L45/74H04L9/40
Inventor 曹静
Owner ZTE CORP
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