Overcome the limitations of the Network Topology of the Three-Tier

Enterprise introduction of virtualization and cloud advances, in the Ethernet of a conventional three-layer structure has arisen a disadvantage in terms of traffic. The are proposed Saree in order to overcome this, it’s approach of “fabric”.

Overcome the limitations of the network topology of the three-tier

In the latest thinking on the design of the data center, we are encouraging the introduction of virtualization. But virtualization is also significantly affecting network.

Network speaking, it is preferable to know the physical location of the servers and storage. That way, the network path is optimized, it is possible to suppress the number of different servers and jump between the storage (for example, IP traffic network switches and routers must pass) to a minimum. The more servers and storage path between is a direct, data center performance is improved.
However, to take full advantage of the virtualization servers and storage, it must not be that the physical location of the VM is bound. If Shibare the position, because affect the flexibility of the virtual infrastructure. Consequently, it is not easy to optimize the traditional Ethernet for virtualization and cloud.

network topology

Overcome the limitations of the network topology of the three-tier

In December 2010 opened the investigation that has been carried out in the data center conference of Gartner, 83% of respondents or make changes in the new location of the assignment changes and workload using the mobile, and policy for optimization I had to or use the base of the software rules.

The idea of ​​Gartner, in order to respond to the dynamic allocation of the VM, it is necessary to approach “computing fabric.” The VM network and the server, the storage functions as a single unit which is connected by a switch. Gartner distinguished analyst, Andy Butler, in the “cloud and virtualization, modern blade platforms, such as the network becomes difficult .HP Virtual Connect and Cisco UCS (Unified Computing System), in order to simplify the (network ) has been integrated with the switch “and pointed out. “In the fabric computing, network switches server, network, it is assumed that are integrated with storage” is commentary.

According to the storage network equipment maker Brocade, Ethernet design is not suitable for the cloud. Once has a network administrator to manage the performance of the core of the network, it was possible to optimize the network. However, regional sales director of Brocade, according to Mr. Marcus Jewell, that unpredictability of network traffic increases in the virtualization.

Brocade of system engineers, Mr. Duncan Hughes says. During the “last in ’20, we access layer, aggregation layer, have used a hierarchical layer of the three layers consisting of a core layer. Routing is intended to be run only in the core layer, and therefore if different of the network (subnet) If it is necessary to communicate with the server in a portion, and back three layers of the network (three network devices), and had come back again. ” This is inefficient and does not work very well in a virtual environment.

He said, by using this approach to network if a virtual environment, the network traffic between VM will be back and forth to the network.

Therefore, the network equipment manufacturers such as Brocade is in currently pitching is, it’s the idea of ​​the network fabric to overcome the network problems caused by virtualization. Flat layers Brocade developed, two networks, self-healing type fabric, has been described as able to overcome the limitations in the case of using a network topology of three layers.