Disable or enable VLAN attachments

You can temporarily disable a VLAN attachment so that it stops forwarding packets. This can be useful, for example, for testing failover. Disable one Dedicated Interconnect connection to test that the redundant connection can successfully serve traffic.

You can enable VLAN attachments, typically after testing for failover.

Drain traffic from a VLAN attachment

Shut down BGP

We recommend that you disable a VLAN attachment by disabling its Border Gateway Protocol (BGP) session. Disabling only the BGP session instead of disabling the entire VLAN attachment avoids packet loss. After making this configuration change, it can take a few minutes for traffic to completely move away. For more information, see Disable a BGP session.

Disable a VLAN attachment

If you need to disable your VLAN attachment more rapidly, or if you need to ensure that zero packets are sent over your VLAN attachment, you can disable the entire VLAN attachment. This process can incur packet loss. To disable a VLAN attachment, do the following:

Console

  1. In the Google Cloud console, go to the VLAN attachments tab.

    Go to VLAN attachments

  2. On the VLAN attachments tab, select a VLAN attachment to disable.

  3. On the VLAN attachment details page, click Disable. The attachment stops forwarding packets within a minute or two. To re-enable the attachment, click Enable.

gcloud

To disable an existing active attachment, use the --no-admin-enabled flag:

 gcloud compute interconnects attachments dedicated update my-attachment
     --region us-central1
     --no-admin-enabled

The attachment stops forwarding packets within a minute or two.

To enable the attachment, use the --admin-enabled flag.

Restore traffic to a VLAN attachment

To restore traffic to your VLAN attachment, you must either enable its BGP session or enable the VLAN attachment, depending on how you drained traffic from your VLAN attachment.

Enable BGP

If you disabled your VLAN attachment by disabling its BGP session, then you must re-enable BGP to make your attachment work again.

Enabling BGP takes a few minutes to take effect. For more information, see Enable a BGP session.

Enable a VLAN attachment

If you shut down your VLAN attachment by disabling your VLAN attachment, then you must enable your VLAN attachment to restore traffic to your attachment.

Do the following:

Console

  1. In the Google Cloud console, go to the VLAN attachments tab.

    Go to VLAN attachments

  2. On the VLAN attachments tab, select a VLAN attachment to enable.

  3. On the VLAN attachment details page, click Enable. The attachment starts forwarding packets within a minute or two.

gcloud

To enable an existing active attachment, use the --admin-enabled flag:

 gcloud compute interconnects attachments dedicated update my-attachment
     --region us-central1
     --admin-enabled

The attachment starts forwarding packets within a minute or two.

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