> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/welcome/ip-transit/high-availability/ha-billing.md).

# HA Billing

**Core principle**: Physical resources (backbone bandwidth, public bandwidth) are billed independently; logical resources (IP addresses) are billed as a single unit.

## Billing Items

| Billing Item            | Units Charged                       | Description                                                        |
| ----------------------- | ----------------------------------- | ------------------------------------------------------------------ |
| HA Backbone Bandwidth   | 1 unit (primary + standby combined) | Billed at the sum of both links' bandwidth                         |
| HA IPT Public Bandwidth | 1 unit (primary + standby combined) | Billed at the sum of both links' bandwidth                         |
| Public IP address block | Per address block                   | IPs are bound at the HA logical layer — each block is charged once |

## Flat Rate Example

**Example**: Primary link 100 Mbps + standby link 100 Mbps, one /30 and one /31 public IP block

| Billing Item            | Metered Value |
| ----------------------- | ------------- |
| HA Backbone Bandwidth   | 200 Mbps      |
| HA IPT Public Bandwidth | 200 Mbps      |
| Public IP (/30)         | 1 unit        |
| Public IP (/31)         | 1 unit        |

## Burstable 95th Example

**Example**: Primary link with 30 Mbps commit / 100 Mbps burst, standby link with the same spec, one /30 and one /31 public IP block

**Case 1**: Monthly traffic stays within the commit (combined 95th percentile of both links ≤ 30 Mbps)

| Billing Item                   | Metered Value |
| ------------------------------ | ------------- |
| HA Backbone Bandwidth (commit) | 30 Mbps       |
| HA IPT Bandwidth               | 30 Mbps       |
| Public IP (/30)                | 1 unit        |
| Public IP (/31)                | 1 unit        |

**Case 2**: Traffic exceeds the commit (example: combined 95th percentile = 70 Mbps)

| Billing Item                  | Metered Value |
| ----------------------------- | ------------- |
| HA Backbone Bandwidth (burst) | 70 Mbps       |
| HA IPT Bandwidth              | 70 Mbps       |
| Public IP (/30)               | 1 unit        |
| Public IP (/31)               | 1 unit        |

{% hint style="info" %} <mark style="color:blue;">**Burstable 95th Note**</mark>

<mark style="color:blue;">The system aggregates traffic data from both links and uses the combined 95th percentile value as the billable measurement. Only one commit fee is charged.</mark>
{% endhint %}