EVPN to Managed AVPN Service Upgrade

The purpose of this document is to provide SWIFT End Users with need-to-know information about the AT&T initiated service upgrade from Enhanced VPN (EVPN) to AT&T VPN (AVPN).

AVPN is AT&T’s next generation VPN service, it will replace EVPN. Sunset target date for the existing EVPN service is October 31st 2018.

Customers choosing not to upgrade to AVPN are encouraged to take alternative measures to ensure continued access to the SWIFT platform after EVPN service withdrawal.

Upgrade – reuse of the access circuit and reuse of the router

This scenario applies to sites where the EVPN local access circuit and the router will be retained for migration to AVPN.

PRELIMINARY NOTE: AT&T is responsible for communicating with SWIFT about access and port speed. To avoid confusion, end users are kindly requested not to reach out to SWIFT to provide information on access and port speed.

Ordering – change order sign-off by customer commercial contact

A new contracting event is not required. AT&T will issue a change order under the existing agreement.

As a first step in the migration process, the AT&T account team will reach out to the commercial contact for each site in scope. The commercial contact will be provided with the  change order for migration to AVPN, highlighting:

  • access price
  • intended migration scenario: access reuse

The commercial contact will be asked for approval of the change order and for contact details of the local site contact.

Action required from customer commercial contact: change order sign-off and confirmation of local site contact.


AT&T will handle all implementation activities for migration to AVPN. This mainly includes AT&T tooling and database changes for the site to be converted to AVPN.

No site visit is required for migration to AVPN with reuse of the access circuit and router.


The migration entails a logical change. No physical impact is expected during the migration, there will be no downtime. There will be an impact on traffic classification (Class of Service – COS) during the migration.

Given that COS will temporarily be disabled, congestion may occur if the migration were to be performed during peak hours. This could lead to slow throughput of traffic flows until the situation is normalized.

To avoid congestion, migrations are performed outside of office hours for all sites. Premium sites will be migrated during SWIFT Allowable Downtime Window.

Migration windows contain a buffer for rollback to EVPN should any issues occur.

When the site is ready for migration, AT&T will schedule the upgrade and will send a maintenance notification to SWIFT confirming the scheduled date and time.

The upgrade itself will be performed by a remote AT&T engineer who will test connectivity afterwards.

For Premium sites, AT&T will be contacting SWIFT after the change to validate connectivity.

Customers will receive an email notification after the migration with confirmation that the upgrade is complete.

Action required from customer local site contact:

Test the POTS line for out of band access before migration.

Back to Upgrade Overview