Method and system for inhibiting address resolution protocol (ARP) message, and controller

Abstract

The embodiments of the invention disclose a method and system for inhibiting an address resolution protocol (ARP) message, and a controller. The method comprises the following steps: when a source host needs to communicate with target hosts in different local area networks in the same intercommunication domain in a VxLAN, the source host emitting an ARP request, a VxLAN gateway controller which the source host belongs to forwarding the ARP request, the controller, according to IP addresses of the target hosts in the ARP request, querying whether a pre-learnt address resolution table stores MAC address of the target hosts, and if the MAC address of the target hosts are already stored, the controller responding to the ARP request of the source host; if the MAC addresses of the target hosts are not stored, a controller indication source VxLAN gateway sending the ARP request to other VxLAN gateways in the same intercommunication domain; and other VxLAN gateways, after receiving the ARP request, spreading the ARP request in their own local area networks, and forwarding an ARP response to the source host and reporting the ARP request to the controller. According to the embodiments of the invention, forwarding of ARP broadcast messages on a VxLAN tunnel and in the intercommunication domain can be effectively inhibited, the bandwidth of the VxLAN tunnel is saved, and the ARP query efficiency is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method, system and controller for suppressing ARP messages. Background technique [0002] As information technology (IT) organizations move toward a converged infrastructure and service-oriented model, it is increasingly found that the current data center network connectivity architecture is a limiting factor. The virtual local area network (VLAN)-based switching model has a long history, but they The following challenges were encountered in the data center: [0003] 1. Lack of flexibility: VLAN and switching boundaries are neither flexible nor easy to extend. As needs rise and fall, compute and storage resources need to be allocated without significant operational overhead. [0004] 2. Inefficient fault-tolerant operations: High-availability technologies (such as VMware Fault Tolerance) are most effective on "flat" layer-two networks, but creating and managing this architecture is ...

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Problems solved by technology

[0004] 2. Inefficient fault-tolerant operations: High-availability technologies (such as VMware Fault Tolerance) are most effective on "flat" layer-two networks, but creating and managing this architecture is operationally difficult, especially at scale even more so when

[0005] 3. Limitations of VLAN and Internet Protocol (IP) address management: IP address maintenance and VLAN restrictions become difficult problems for data center expansion, especially when strong isolation is required or in a service provider environment

[0009] There will be more overhead for each VxLAN gateway to join the multicast group; each time an ARP conversation occurs, the broadcast will be sent to all domains, but only the VxLAN gateways in the domains of the sending and receiving parties can learn the MAC addresses of both parties, and the other domains If the host needs to access the target host, it needs to re-initiate the ARP query. This mechanism will generate a large number of multicast and broadcast packets and occupy a large amount of IP link bandwidth.

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