IP Transit High Availability (HA)

Build a redundant egress architecture with dual ports to eliminate single points of failure and ensure business continuity.

IP Transit High Availability (HA) allows you to build a redundant egress architecture using two co-located physical ports, eliminating single points of failure and ensuring business continuity. The dual-link HA architecture delivers an SLA of 99.95%, higher than the single-link standard.

Note

HA instances are currently only supported on automated (BR) devices. Upgrading existing single-link instances to HA is not supported in this release.

Operating Modes

HA instances support two operating modes, which can be switched at any time after creation:

Mode	Alias	Description
Active-Standby	Primary-Backup	The primary port carries all traffic. If the primary port fails, traffic automatically switches to the standby port within seconds. Suitable for workloads that require deterministic routing paths.
Active-Active	Load Balancing	Both links forward traffic simultaneously using ECMP. Maximizes bandwidth utilization; traffic migrates smoothly if one link fails.

Routing Mode

HA instances support Static Routing only.

Prerequisites

• Your account has completed identity verification and has sufficient balance.

• The target city has two or more available IP Transit physical ports with status UP.

• Both ports are of the same port type, for example, both are Standard Ports.

• VLAN IDs are planned for both the primary and standby ports (the same value is recommended for both).

• BFD parameters are planned. BFD is required for HA instances and cannot be disabled after creation.

• You have determined the required bandwidth specification and billing model (Flat Rate / Burstable 95th).