Modifying VLAN Attachments

This document describes how you can modify VLAN attachments for Partner Interconnect.


The following table lists properties associated with VLAN attachments and describes what to do if you want to modify a property:

Property How to modify
Capacity To modify capacity, you must work with your service provider as described in the Modifying capacity section of this document.
Description See the instructions in this document for Modifying the description. Modifications are immediate and don't disrupt traffic.
Whether a VLAN attachment is enabled or disabled To disable or re-enable a VLAN attachment, see Disabling VLAN Attachments.
VLAN ID You can't modify these properties for existing attachments. Instead, you must recreate the VLAN attachment. To create VLAN attachments for Partner Interconnect, see Creating VLAN attachments.
BGP IP addresses (Cloud Router IP, on-premises router IP)

The peer ASN is not a property of the VLAN attachment— it is part of the BGP configuration of the Cloud Router. If you have a Layer 2 connection and you want to modify the peer ASN, update the Cloud Router's BGP session for the VLAN attachment. For more information, see Viewing Cloud Router configuration, the glcoud compute routers update-bgp-peer command reference, or the routers.update API method reference.

Modifying capacity

For an existing VLAN attachment, Google Cloud supports increasing or decreasing the attachment's capacity as your capacity demands rise or fall. Because capacity changes can affect your service provider's network, you must work with them to change your attachment's capacity. Changes in capacity, in rare cases, can cause traffic disruption. If traffic is disrupted, the disruption lasts less than a minute.

After the service provider has updated your attachment, your service provider works with Google to update the attachment's capacity in your Google Cloud project. At that time, Google updates the charges for the attachment based on the new capacity.

For a list of all the supported service providers, see Service Providers.

Modifying the description

The section provides instructions for updating the description of a VLAN attachment.


  1. Go to the Cloud Interconnect VLAN attachments tab in the Google Cloud Console.
    Go to VLAN attachments tab
  2. Select the VLAN attachment to modify.
  3. On the attachment's detail page, select Edit.
  4. Modify the Description of your VLAN attachment and then select Save.


  1. Modify an InterconnectAttachment by specifying the name of the existing VLAN attachment and the attributes to modify.

    gcloud compute interconnects attachments partner update [NAME] \
      --region [ATTACHMENT'S_REGION] \
      --description [DESCRIPTION]

    For more information, see the gcloud command line reference.