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Glossary

Definitions of technical and product terms used across this documentation. Most terms link to the pages where they appear in context.


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 


Definitions of technical and product terms used across this documentation. Most terms link to the pages where they appear in context.


A

Active-Active - A redundancy pattern where two connections carry production traffic simultaneously, with path preference controlled by BGP attributes such as local preference and AS-PATH.

Active-Passive A redundancy pattern where one connection carries production traffic while a second standby connection takes over on failure. Switchover is usually triggered by BGP session loss or BFD.

ASN (Autonomous System Number) A globally unique number assigned to a network for use with BGP. Each side of a BGP session declares its ASN. Tata Communications uses ASN 4755 on the GVPN side of IZO™+ Multi Cloud Connect connections.

AWS Direct Connect Amazon’s service for establishing a dedicated network connection between an on-premises network and AWS. IZO™+ Multi Cloud Connect delivers Direct Connect as a managed service via Hosted Connections.

Azure ExpressRoute Microsoft’s service for extending on-premises networks into Azure over a private connection. IZO™+ Multi Cloud Connect delivers ExpressRoute as a managed service.

B

Bandwidth slab A specific bandwidth tier offered for an IZO™+ Multi Cloud Connect connection. Slabs are cloud-provider-specific; for example, AWS supports 50 Mbps to 25 Gbps and Azure supports 50 Mbps to 10 Gbps.

BFD (Bidirectional Forwarding Detection) A protocol for sub-second detection of link failures, paired with BGP to accelerate failover between redundant connections.

BGP (Border Gateway Protocol) The dynamic routing protocol used between a customer network and a cloud provider over IZO™+ Multi Cloud Connect. BGP advertises prefixes, controls path selection, and enables fast failover.

C

Class of Service (COS) A QoS marking used to prioritise traffic on the Tata Communications MPLS backbone. IZO™+ Multi Cloud Connect connections are typically configured with a single COS class to provide consistent quality of service.

Cloud-to-Cloud Connectivity A deployment pattern where two or more public clouds are interconnected privately through IZO™+ Multi Cloud Connect, eliminating the public-internet path between them.

CPE (Customer Premise Equipment) The customer-side network device (typically a router) that terminates the IZO™+ Multi Cloud Connect connection at the enterprise site. CPE can be managed by Tata Communications or by the customer.

D

Deployment scenario The topology in which IZO™+ Multi Cloud Connect is deployed at the customer side. The four supported scenarios are Full Mesh, Hub-and-Spoke, Cloud-to-Cloud, and Selected Site.

DRG (Dynamic Routing Gateway) Oracle Cloud Infrastructure’s edge routing component, attached to FastConnect connections to exchange routes with the customer network.