Modify VLAN attachments

This document describes how to modify VLAN attachments and Border Gateway Protocol (BGP) sessions for Cross-Cloud Interconnect.

The following table describes properties of VLAN attachments and their BGP sessions, along with information about how to modify them.

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, remote cloud router IP address)

You can't modify these properties for existing attachments. Instead, you must re-create the VLAN attachment.
MD5 authentication Update the BGP session by following the steps in Add authentication to an existing session.
Peer ASN

Update the BGP session by using 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 typically lasts less than a minute.

To make use of the 1500-byte MTU, the VPC network that uses the attachment must have an MTU set to 1500. In addition, the remote cloud resources must have an MTU set to1500. If your network has the default MTU of 1460, leave the field at 1440.

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.
    • Maximum transmission unit (MTU): The MTU of the attachment.

  5. Click Save.

gcloud

Use the gcloud compute interconnects attachments dedicated update command:

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

Replace the following:

  • NAME: the name of the VLAN attachment
  • REGION: the region of the attachment
  • DESCRIPTION: a description of the attachment
  • BANDWIDTH: the provisioned capacity of the attachment
  • MTU: the MTU of the attachment

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