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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Background

Background

Server Virtualization

Virtualization and cloud computing are two development trends of data centers. Currently, the average usage of a data center is only 20% to 30%, the usage of PCs is 9%, and the CPU usage of 90% servers is lower than 10% during their 90% operating time. Server virtualization was then developed to improve the server resource use efficiency.

Server virtualization is the partitioning of a physical server into smaller virtual machines (VMs) to help maximize server resource use efficiency. It is implemented using the Hypervisor software. Deploying server virtualization has led to a need for a solution that can manage physical and virtual networks and deploy virtual servers on a large scale.

Server virtualization uses virtual switches (vSwitches). A vSwitch is integrated in a server to enable VMs to communicate with each other or with external devices.

Server Virtualization Solution

VMs in a server exchange data using either of the following methods:

  • Virtual Ethernet Bridge (VEB): implemented using software-based Vswitch (similar to using Vmware).

  • Virtual Edge Port Aggregator (VEPA): deploys 802.1 Qbg or 802.1 Qbh on access switches using a vSwitch.

Table 10-19 Software-based vSwitch models

Model

Diagram

Description

Virtual Ethernet Bridge (VEB)

Hypervisor provides the VEB model to implement frame exchanges between VMs in a server. A VM of a physical server or a virtual local area network (VLAN) sends a frame to the switch only when the VM needs to exchange frames with a VM of another physical server or VLAN.

The VEB model has a short delay and is easy to deploy. Server loads, however, are heavy. A vSwitch cannot provide a flow control policy. Deploying a flow control policy on a vSwitch affects traffic forwarding. Network devices cannot control VMs or participate in policy deployment.

Virtual Edge Port Aggregator (VEPA)

802.1Qbg poses the VEPA model to overcome the disadvantages of the VEB model. A vSwitch forwards all frames from the VMs to an adjacent switch. The switch applies various policies on those frames and forwards them back to the vSwitch. The vSwitch then forwards each frame to the appropriate VM based on the MAC address and VLAN ID.

Virtualization Perception

Server virtualization isolates programs that run on different operating systems (OSs) of the same device and prevents resource conflicts.

As a key cloud computing technology, server virtualization reduces IT costs, improves service deployment flexibility, reduces operation and maintenance (OM) expenditure. Server virtualization has been widely deployed owing to these strengths.

Server virtualization unites storage, network, and security technologies and brings great challenges to data center network deployment and management.
  • After server virtualization is deployed, an end-to-end (E2E) solution is required to manage physical and virtual networks.

  • The partitioning of a physical server into smaller virtual machines (VMs) causes the partitioning of a physical interface into virtual service interfaces (VSIs). VM migration causes interface attribute migration.

  • Unlike a network switch, a virtual switch cannot be accessed by a network administrator and needs to be managed using different tools. There is no unified NMS that can manage the tools. As a result, it is difficult to obtain the entire network topology.

  • Server virtualization creates a virtual network based on a physical network. Hence, it is difficult to implement unified network and security policies.

The virtualization perception management plane detects virtual environment changes and unifies software differences to automatically update physical network configurations.

The virtualization perception solution is an E2E solution used to manage physical and virtual networks.
  • The virtualization perception unifies server virtualization software differences and uses VSIs to manage network interfaces.

  • Virtualization perception helps to dynamically obtain the topologies of physical and virtual networks.

  • The virtualization perception solution provides network security policies, such as access control lists (ACLs) and quality of service (QoS) policies.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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