Dell Networking S6000 System Bedienungsanleitung PDF herunterladen (Seite 13)

13 Network Virtualization with Dell Infrastructure and VMware NSX | Version 1.2

Figure 7 VXLAN Encapsulated Frame

The NSX controllers are all active and clustered for scalability and high availability; network information is

distributed across the nodes in the cluster, and each control node is elected as the master for different

roles and tasks.

The NSX control plane communication occurs over the management network. Each controller node has a

unique IP address and nodes monitor each other via heart-beat; failed nodes are detected within ten

seconds. A supported configuration consists of a cluster of at least three controllers.

The controller high availability is based on a majority concept in which a failure of one controller does not

impact the control plane operation of the control cluster. Also, the network will continue forwarding traffic

even if all three controllers fail, however, any changes or learning of new network information will not be

possible until at least one controller is brought back to operation.

The NSX Manager communicates with the vCenter server and NSX controllers via the management plane.

NSX Manager utilizes REST API calls to configure the NSX components on the logical network. Once the

control cluster receives the NSX API calls, it’s responsible for propagating the network state,

configurations, and updates to all hosts in the respective transport zone. This communication is done via

connection between controller and hosts. This connectivity from the host viewpoint is managed by the

User World Agent (UWA) which is a is a TCP (SSL) client that sits on each host and communicates with the

controller using the control plane protocol.

Note, once the network state, configuration, and update information has been pushed down to the host,

data can move directly between hypervisors.

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Dell Networking S6000 System Bedienungsanleitung Seite 13