There is a command group 'az_network_vnet gateway'. This group of commands could 'use an azure virtual network gateway to establish secure  cross premises connectivity'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_network_vnet gateway_update'.The syntax is: az network vnet-gateway update [--add]
                               [--address-prefix]
                               [--asn]
                               [--bgp-peering-address]
                               [--client-protocol]
                               [--enable-bgp {0, 1, f, false, n, no, t, true, y, yes}]
                               [--force-string {0, 1, f, false, n, no, t, true, y, yes}]
                               [--gateway-default-site]
                               [--gateway-type {expressroute, vpn}]
                               [--ids]
                               [--name]
                               [--no-wait {0, 1, f, false, n, no, t, true, y, yes}]
                               [--peer-weight]
                               [--public-ip-address]
                               [--radius-secret]
                               [--radius-server]
                               [--remove]
                               [--resource-group]
                               [--root-cert-data]
                               [--root-cert-name]
                               [--set]
                               [--sku {basic, ergw1az, ergw2az, ergw3az, highperformance, standard, ultraperformance, vpngw1, vpngw1az, vpngw2, vpngw2az, vpngw3, vpngw3az}]
                               [--subscription]
                               [--tags]
                               [--vnet]
                               [--vpn-type {policybased, routebased}]. The 1th example of the child command would be to use it to 'change the sku of a virtual network gateway', the syntax is: az network vnet-gateway update -g MyResourceGroup -n MyVnetGateway --sku VpnGw2. The 2th example of the child command would be to use it to 'update a virtual network gateway', the syntax is: az network vnet-gateway update --address-prefixes 40.1.0.0/24 --client-protocol IkeV2 --name MyVnetGateway --resource-group MyResourceGroup. The parameter '--add' is optional. add an object to a list of objects by specifying a path and key value pairs.  example: --add property.listproperty <key=value, string or json string>.. The parameter '--address-prefix --address-prefixes' is optional. space-separated list of cidr prefixes representing the address space for the p2s vpnclient.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.  singular flags: `--address-prefix`.. The parameter '--asn' is optional. autonomous system number to use for the bgp settings.. The parameter '--bgp-peering-address' is optional. ip address to use for bgp peering.. The parameter '--client-protocol' is optional. protocols to use for connecting.  allowed values: ikev2, openvpn, sstp.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--enable-bgp' is optional. enable bgp (border gateway protocol).. The parameter '--force-string' is optional. when using 'set' or 'add', preserve string literals instead of attempting to convert to json.. The parameter '--gateway-default-site' is optional. name or id of a local network gateway representing a local network site with default routes.. The parameter '--gateway-type' is optional. the gateway type.. The parameter '--ids' is optional. one or more resource ids (space-delimited). it should be a complete resource id containing all information of 'resource id' arguments. you should provide either --ids or other 'resource id' arguments.. The parameter '--name -n' is optional. name of the vnet gateway.. The parameter '--no-wait' is optional. do not wait for the long-running operation to finish.. The parameter '--peer-weight' is optional. weight (0-100) added to routes learned through bgp peering.. The parameter '--public-ip-address --public-ip-addresses' is optional. specify a single public ip (name or id) for an active-standby gateway. specify two space-separated public ips for an active-active gateway.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--radius-secret' is optional. radius secret to use for authentication.. The parameter '--radius-server' is optional. radius server address to connect to.. The parameter '--remove' is optional. remove a property or an element from a list.  example: --remove property.list <indextoremove> or --remove propertytoremove.. The parameter '--resource-group -g' is optional. name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--root-cert-data' is optional. base64 contents of the root certificate file or file path.. The parameter '--root-cert-name' is optional. root certificate name.. The parameter '--set' is optional. update an object by specifying a property path and value to set.  example: --set property1.property2=<value>.. The parameter '--sku' is optional. vnet gateway sku.. The parameter '--subscription' is optional. name or id of subscription. you can configure the default subscription using `az account set -s name_or_id`.. The parameter '--tags' is optional. space-separated tags: key[=value] [key[=value] ...]. use "" to clear existing tags.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--vnet' is optional. name or id of an existing virtual network which has a subnet named 'gatewaysubnet'.. The parameter '--vpn-type' is optional. vpn routing type.. 