The connectivity model that meets the requirements of high availability, redundancy, and low

latency for the company’s business applications is ExpressRoute with private peering using SDCI.

ExpressRoute is a service that provides a dedicated, private, and high-bandwidth connection

between the customer’s on-premises network and Microsoft Azure cloud network1.

Private peering is a type of ExpressRoute circuit that allows the customer to access Azure services

that are hosted in a virtual network, such as virtual machines, storage, and databases2.

SDCI (Secure Data Center Interconnect) is a Cisco solution that enables secure and scalable

connectivity between multiple data centers and cloud providers, using technologies such as MPLS,

IPsec, and SD-WAN3.

By using ExpressRoute with private peering and SDCI, the company can achieve the following

benefits:

High availability: ExpressRoute circuits are redundant and resilient, and can be configured with

multiple service providers and locations for failover and load balancing1. SDCI also provides high

availability by using dynamic routing protocols and encryption mechanisms to ensure optimal and

secure path selection3.

Redundancy: ExpressRoute circuits can be paired together to form a redundant connection between

the customer’s network and Azure4. SDCI also supports redundancy by allowing multiple

connections between data centers and cloud providers, using different transport technologies and

service levels3.

Low latency: ExpressRoute circuits offer lower latency than public internet connections, as they

bypass the congestion and variability of the internet1. SDCI also reduces latency by using MPLS and

SD-WAN to optimize the performance and quality of service for the traffic between data centers and

cloud providers3.

Reference:

What is Azure ExpressRoute?

Azure ExpressRoute peering

Cisco Secure Data Center Interconnect

ExpressRoute circuit and routing domain