# CfnRouteServerProps

Properties for defining a `CfnRouteServer`.

Extends: CfnRouteServerProps
Used as props by: CfnRouteServer

- Source: Generated code
- Type last changed: v2.188.0 · 4 Apr 2025

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_ec2 as ec2 } from 'aws-cdk-lib';
const cfnRouteServerProps: ec2.CfnRouteServerProps = {
  amazonSideAsn: 123,

  // the properties below are optional
  persistRoutes: 'persistRoutes',
  persistRoutesDuration: 123,
  snsNotificationsEnabled: false,
  tags: [{
    key: 'key',
    value: 'value',
  }],
};
```

## Properties

- `amazonSideAsn`: number (required) — The Border Gateway Protocol (BGP) Autonomous System Number (ASN) for the appliance.

  Valid values are from 1 to 4294967295. We recommend using a private ASN in the 64512–65534 (16-bit ASN) or 4200000000–4294967294 (32-bit ASN) range.

- `persistRoutes`: string — Indicates whether routes should be persisted after all BGP sessions are terminated.

- `persistRoutesDuration`: number — The number of minutes a route server will wait after BGP is re-established to unpersist the routes in the FIB and RIB.

  Value must be in the range of 1-5. The default value is 1. Only valid if `persistRoutesState` is 'enabled'.

  If you set the duration to 1 minute, then when your network appliance re-establishes BGP with route server, it has 1 minute to relearn it's adjacent network and advertise those routes to route server before route server resumes normal functionality. In most cases, 1 minute is probably sufficient. If, however, you have concerns that your BGP network may not be capable of fully re-establishing and re-learning everything in 1 minute, you can increase the duration up to 5 minutes.

- `snsNotificationsEnabled`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Indicates whether SNS notifications are enabled for the route server.

  Enabling SNS notifications persists BGP status changes to an SNS topic provisioned by AWS .

- `tags`: [CfnTag](/cdk/api/v2/docs/aws-cdk-lib.CfnTag.html)[] — Any tags assigned to the route server.