Modify VLAN attachments

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This document describes how to modify VLAN attachments for Dedicated Interconnect.

The following table lists properties associated with VLAN attachments and describes how to modify the properties.

Property How to modify

Description

Capacity

MTU

For details, see the next section Modifying description, capacity, and MTU.

Modifications are immediate and in rare cases, can cause traffic disruption. If traffic is disrupted, the disruption lasts less than a minute.
Whether a VLAN attachment is enabled or disabled To disable or re-enable a VLAN attachment, see Disable VLAN attachments.

VLAN ID

BGP IP addresses (Cloud Router IP address, on-premises router IP address)

You can't modify these properties for existing attachments. Instead, you must recreate the VLAN attachment.

To create VLAN attachments for Dedicated Interconnect, see Creating VLAN attachments.
MD5 authentication Follow the steps in Add authentication to an existing session.

The peer ASN is not a property of the VLAN attachment—it is part of the BGP configuration of the Cloud Router. To modify the peer ASN, update the Cloud Router's BGP session for the VLAN attachment.

For more information, see the following resources:

Modify description, capacity, and MTU

The section provides instructions for updating the description, capacity, and maximum transmission unit (MTU) of a VLAN attachment. Changing the attributes of a VLAN attachment, in rare cases, can cause traffic disruption. If traffic is disrupted, the disruption lasts less than a minute.

To make use of the 1460 or 1500-byte MTU, the VPC network that uses the attachment must have the same MTU value. In addition, the on-premises VMs and routers must also have the same MTU value. If your network has the default MTU of 1460, then select an MTU of 1460 for your VLAN attachment.

You cannot modify the MTU (1440) of an encrypted VLAN attachment that is used in an HA VPN over Cloud Interconnect deployment.

Console

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

    Go to VLAN attachments

  2. Select the VLAN attachment to modify.

  3. On the attachment's detail page, click Edit.

  4. Modify your VLAN attachment:

    • Description: Information about the VLAN attachment.
    • Capacity: The maximum bandwidth of the attachment. If you modify the capacity of an encrypted VLAN attachment, you might need to add HA VPN tunnels to accommodate increased traffic. For more information, see Configure HA VPN over Cloud Interconnect.
    • Maximum transmission unit (MTU): The MTU of the attachment.

  5. Click Save.

gcloud

Modify an interconnectAttachment by specifying the name of the existing VLAN attachment and the attributes to modify:

gcloud compute interconnects attachments dedicated update NAME \
    --region=REGION \
    --description=DESCRIPTION \
    --bandwidth=BANDWIDTH \
    --mtu MTU

Replace the following:

  • NAME: the name of the existing VLAN attachment
  • REGION: the region of the attachment
  • DESCRIPTION: a description of the attachment
  • BANDWIDTH: the provisioned capacity of the attachment. If you modify the capacity of an encrypted VLAN attachment, you might need to add HA VPN tunnels to accommodate the increased traffic. For more information, see Configure HA VPN over Cloud Interconnect.
  • MTU: the MTU of the attachment

For more information, see the gcloud compute interconnects attachments dedicated update reference.

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