> **Experimental**
>
> `@aws-cdk/aws-mediaconnect-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# PrimarySource

Identifies which protocol in a failover configuration's protocols array is primary.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/router-input.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0-alpha.0/packages/@aws-cdk/aws-mediaconnect-alpha/lib/router-input.ts#L343)

## Example

```ts
declare const stack: Stack;
declare const networkInterface: RouterNetworkInterface;

const input = new RouterInput(stack, 'FailoverInput', {
  routerInputName: 'failover-input',
  maximumBitrate: Bitrate.mbps(10),
  routingScope: RoutingScope.REGIONAL,
  tier: RouterInputTier.INPUT_20,
  configuration: RouterInputConfiguration.failover({
    networkInterface: networkInterface,
    protocols: [
      RouterInputProtocol.rist({
        port: 5000,
        recoveryLatency: Duration.millis(1000),
      }),
      RouterInputProtocol.rist({
        port: 5002, // Must not be consecutive with primary port
        recoveryLatency: Duration.millis(1000),
      }),
    ],
    sourcePriority: SourcePriorityConfig.primarySecondary(PrimarySource.FIRST_SOURCE),
  }),
});
```

## Members

| Member | Description |
| --- | --- |
| `FIRST_SOURCE` | The first protocol in the failover protocols array. |
| `SECOND_SOURCE` | The second protocol in the failover protocols array. |