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gcloud compute routers update-interface

NAME
gcloud compute routers update-interface - update an interface on a Compute Engine router
SYNOPSIS
gcloud compute routers update-interface NAME --interface-name=INTERFACE_NAME [--ip-address=IP_ADDRESS] [--ip-version=IP_VERSION] [--mask-length=MASK_LENGTH] [--region=REGION] [--interconnect-attachment=INTERCONNECT_ATTACHMENT     | --interconnect-attachment-region=INTERCONNECT_ATTACHMENT_REGION     | --vpn-tunnel=VPN_TUNNEL     | --vpn-tunnel-region=VPN_TUNNEL_REGION] [GCLOUD_WIDE_FLAG …]
DESCRIPTION
gcloud compute routers update-interface is used to update an interface on a Compute Engine router.
POSITIONAL ARGUMENTS
NAME
Name of the router to update.
REQUIRED FLAGS
--interface-name=INTERFACE_NAME
The name of the interface being updated.
OPTIONAL FLAGS
--ip-address=IP_ADDRESS
The link local (IPv4) or ULA (IPv6) address of the router for this interface.
--ip-version=IP_VERSION
IP version of the interface. Possible values are IPV4 and IPV6. Defaults to IPV4. IP_VERSION must be one of:
IPV4
Interface with IPv4-based BGP.
IPV6
Interface with IPv6-based BGP.
--mask-length=MASK_LENGTH
The subnet mask for the IP range of the interface. The interface IP address and BGP peer IP address must be selected from the subnet defined by this range.
--region=REGION
Region of the router to update. If not specified, you might be prompted to select a region (interactive mode only).

To avoid prompting when this flag is omitted, you can set the compute/region property: 

gcloud config set compute/region REGION

A list of regions can be fetched by running: 

gcloud compute regions list

To unset the property, run: 

gcloud config unset compute/region
 Alternatively, the region can be stored in the environment variable CLOUDSDK_COMPUTE_REGION.
At most one of these can be specified:
--interconnect-attachment=INTERCONNECT_ATTACHMENT
The interconnect attachment of the interface being updated.
--interconnect-attachment-region=INTERCONNECT_ATTACHMENT_REGION
Region of the interconnectAttachment to operate on. If not specified it will be set to the region of the router. Overrides the default compute/region property value for this command invocation.
--vpn-tunnel=VPN_TUNNEL
The tunnel of the interface being updated.
--vpn-tunnel-region=VPN_TUNNEL_REGION
Region of the vpn tunnel to operate on. If not specified it will be set to the region of the router. Overrides the default compute/region property value for this command invocation.
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.

NOTES
These variants are also available: 
gcloud alpha compute routers update-interface
 
gcloud beta compute routers update-interface
 
gcloud preview compute routers update-interface