EYWA: Elastic Load-Balancing and High-Availability Wired Virtual Network Architecture
Wookjae Jeong, Jungin Jung

TL;DR
EYWA is a scalable virtual network architecture designed for large data centers, offering high availability, efficient load balancing, and extensive layer-2 features for multi-tenant cloud environments.
Contribution
It introduces a distributed control and data plane architecture that overcomes scalability and availability limitations of conventional overlay networks in IaaS.
Findings
Supports up to 16 million tenants with isolated virtual LANs.
Provides per-tenant public network services without bottlenecks.
Enables a single large IP subnet per tenant with extended layer-2 semantics.
Abstract
Infrastructure as a Service (IaaS) in cloud environments provides compute, storage, networking, and other fundamental resources that allow consumers to deploy and run arbitrary software, including operating systems and applications. To support multi-tenant environments, IaaS leverages virtualization, but conventional overlay network architectures have become a direct cause of scalability limitations. In particular, current IaaS virtual networks face challenges in high availability and load balancing. To address these issues, we present EYWA, a virtual network architecture that scales to support very large data centers with high availability, efficient load balancing, and large layer-2 semantics. EYWA overcomes scalability limitations by: (1) accommodating a large number of tenants (about 2^24 = 16,777,216) through logically isolated virtual LANs with unique IP ranges, (2) providing…
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