Shaun O Meara 3b698ebba8 [arch-design-draft] Network guide content restructure

Add minimal new content, restructure old content into
new structure.

Change-Id: Icd9536f69036b4c69a631154757629edd1aa6537
Implements: blueprint arch-guide-restructure

2016-11-21 12:12:58 +00:00

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Networking concepts

Cloud fundementally changes the ways that networking is provided and consumed. Understanding the following concepts and decisions is imperative when making architectural decisions.

Network zones

The cloud networks are divided into a number of logical zones that support the network traffic flow requirements. We recommend defining at the least four distinct network zones.

Underlay

The underlay zone is defined as the physical network switching infrastructure that connects the storage, compute and control platforms. There are a large number of potential underlay options available.

Overlay

The overlay zone is defined as any L3 connectivity between the cloud components and could take the form of SDN solutions such as the neutron overlay solution or 3rd Party SDN solutions.

Edge

The edge zone is where network traffic transitions from the cloud overlay or SDN networks into the traditional network environments.

External

The external network is defined as the configuration and components that are required to provide access to cloud resources and workloads, the external network is defined as all the components outside of the cloud edge gateways.

Traffic Flow

There are two primary types of traffic flow within a cloud infrastructure, the choice of networking technologies is influenced by the expected loads.

East/West - The internal traffic flow between workload within the cloud as well as the traffic flow between the compute nodes and storage nodes falls into the East/West category. Generally this is the heaviest traffic flow and due to the need to cater for storage access needs to cater for a minimum of hops and low latency.

North/South - The flow of traffic between the workload and all external networks, including clients and remote services. This traffic flow is highly dependant on the workload within the cloud and the type of network services being offered.

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