Creating a Subnet

Function

This API is used to create a subnet.

Notes and Constraints

IPv6 subnets can be created only when IPv4 subnets have been created on the network.
A VXLAN network can have only one IPv4 subnet and one IPv6 subnet.

URI

POST /v2.0/subnets

Request Parameters

**Table 1** Request parameter
Parameter	Type	Mandatory	Description
subnet	subnet object	Yes	Specifies the subnet. For details, see Table 2.

**Table 2** **subnet** objects
Attribute	Mandatory	Type	Description
name	No	String	Specifies the subnet name.
ip_version	No	Integer	Specifies the IP address version. The value can be 4 (IPv4) or 6 (IPv6).
ipv6_address_mode	No	String	Specifies the IPv6 addressing mode. Only dhcpv6-stateful is supported.
ipv6_ra_mode	No	String	Specifies the IPv6 route broadcast mode. Only dhcpv6-stateful is supported.
network_id	Yes	String	Specifies the ID of the network to which the subnet belongs.
cidr	Yes	String	Specifies the CIDR format. Only the IPv4 addresses in the 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 ranges are supported. The subnet mask cannot be greater than 28. The IPv6 mask cannot be greater than 128.
gateway_ip	No	String	The gateway IP address cannot conflict with IP addresses configured for allocation_pools. This attribute cannot be modified.
allocation_pools	No	Array of allocation_pool objects	Specifies the available IP address pool. For details, see Table 3. Example: [ { "start": "10.0.0.2", "end": "10.0.0.251"} ] The last three and the first IP addresses in each subnet are the ones reserved by the system. For example, in subnet 192.168.1.0/24, IP addresses 192.168.1.0, 192.168.1.253, 192.168.1.254, and 192.168.1.255 are reserved by the system. [{"start": "2001:db8:a583:9::2", "end": "2001:db8:a583:9:ffff:ffff:ffff:fffc"}] In IPv6 subnet 2001:db8:a583:9::/64, IP addresses 2001:db8:a583:9::1, 2001:db8:a583:9:ffff:ffff:ffff:fffd, 2001:db8:a583:9:ffff:ffff:ffff:fffe, and 2001:db8:a583:9:ffff:ffff:ffff:ffff are reserved by the system. By default, the IP addresses reserved by the system are not in the IP address pool specified by allocation_pool. When updating an IP address pool, the allocation_pool value can contain neither gateway nor broadcast IP addresses.
dns_nameservers	No	Array of strings	Specifies the DNS server address. Instructions: Example: "dns_nameservers": ["8.xx.xx.8","8.xx.xx.4"] A maximum of five DNS server addresses are supported.
host_routes	No	Array of host_route objects	Specifies the static VM routes. For details, see Table 4. Static routes are not supported, and entered information will be ignored.
enable_dhcp	No	Boolean	Specifies whether to enable the DHCP function. Value false indicates that the DHCP function is not enabled. The value can only be true.

**Table 3** **allocation_pool** objects
Parameter	Mandatory	Type	Description
start	No	String	Specifies the start IP address of a network pool.
end	No	String	Specifies the end IP address of a network pool.

**Table 4** **host_route** objects
Parameter	Mandatory	Type	Description
destination	No	String	Specifies the destination subnet of a route.
nexthop	No	String	Specifies the next-hop IP address of a route.

Example Request

Create an IPv4 subnet named subnet-test, set its network ID to 0133cd73-34d4-4d4c-bf1f-e65b24603206, and CIDR block to 172.16.2.0/24.

POST https://{Endpoint}/v2.0/subnets 

{
    "subnet": {
           "name": "subnet-test",
           "network_id": "0133cd73-34d4-4d4c-bf1f-e65b24603206",
           "cidr": "172.16.2.0/24",
           "enable_dhcp": true
    }
}

Response Parameters

**Table 5** Response parameter
Parameter	Type	Description
subnet	subnet object	Specifies the subnet. For details, see Table 6.

**Table 6** **subnet** objects
Attribute	Type	Description
id	String	Specifies the subnet ID. This parameter is not mandatory when you query subnets.
name	String	Specifies the subnet name.
ip_version	Integer	Specifies the IP address version. The value can be 4 (IPv4) or 6 (IPv6).
ipv6_address_mode	String	Specifies the IPv6 addressing mode. Only dhcpv6-stateful is supported.
ipv6_ra_mode	String	Specifies the IPv6 route broadcast mode. Only dhcpv6-stateful is supported.
network_id	String	Specifies the ID of the network to which the subnet belongs.
cidr	String	Specifies the CIDR format. Only the addresses in the 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 ranges are supported. In addition, the subnet mask cannot be greater than 28.
gateway_ip	String	The gateway IP address cannot conflict with IP addresses configured for allocation_pools. This attribute cannot be modified.
allocation_pools	Array of allocation_pool objects	Specifies the available IP address pool. For details, see the allocation_pool objects. Table 7 Example: [ { "start": "10.0.0.2", "end": "10.0.0.251"} ] The last three and the first IP addresses in each subnet are the ones reserved by the system. For example, in subnet 192.168.1.0/24, IP addresses 192.168.1.0, 192.168.1.253, 192.168.1.254, and 192.168.1.255 are reserved by the system. By default, the IP addresses reserved by the system are not in the IP address pool specified by allocation_pool. [{"start": "2001:db8:a583:9::2", "end": "2001:db8:a583:9:ffff:ffff:ffff:fffc"}] In IPv6 subnet 2001:db8:a583:9::/64, IP addresses 2001:db8:a583:9::1, 2001:db8:a583:9:ffff:ffff:ffff:fffd, 2001:db8:a583:9:ffff:ffff:ffff:fffe, and 2001:db8:a583:9:ffff:ffff:ffff:ffff are reserved by the system. When updating an IP address pool, the allocation_pool value can contain neither gateway nor broadcast IP addresses.
dns_nameservers	Array of strings	Specifies the DNS server address. Example: "dns_nameservers": ["8.xx.xx.8","8.xx.xx.4"]
host_routes	Array of host_route objects	Specifies the static VM routes. For details, see Table 8. Static routes are not supported, and entered information will be ignored.
tenant_id	String	Specifies the project ID.
enable_dhcp	Boolean	Specifies whether to enable the DHCP function. Value false indicates that the DHCP function is not enabled. The value can only be true.
subnetpool_id	String	Specifies the subnet pool ID. Currently, only IPv6 is supported.
project_id	String	Specifies the project ID. For details about how to obtain a project ID, see Obtaining a Project ID.
created_at	String	Specifies the time (UTC) when the subnet is created. Format: yyyy-MM-ddTHH:mm:ss
updated_at	String	Specifies the time (UTC) when the subnet is updated. Format: yyyy-MM-ddTHH:mm:ss

**Table 7** **allocation_pool** objects
Parameter	Type	Remarks
start	String	Specifies the start IP address of a network pool.
end	String	Specifies the end IP address of a network pool.

**Table 8** **host_route** objects
Parameter	Type	Remarks
destination	String	Specifies the destination subnet of a route.
nexthop	String	Specifies the next-hop IP address of a route.

Example Response

{
    "subnet": {
        "name": "subnet-test",
        "cidr": "172.16.2.0/24",
        "id": "98bac90c-0ba7-4a63-8995-097da9bead1c",
        "enable_dhcp": true,
        "network_id": "0133cd73-34d4-4d4c-bf1f-e65b24603206",
        "tenant_id": "bbfe8c41dd034a07bebd592bf03b4b0c",
        "project_id": "bbfe8c41dd034a07bebd592bf03b4b0c",
        "dns_nameservers": [],
        "allocation_pools": [
            {
                "start": "172.16.2.2",
                "end": "172.16.2.251"
            }
        ],
        "host_routes": [],
        "ip_version": 4,
        "gateway_ip": "172.16.2.1",
        "created_at": "2018-09-20T02:02:16",
        "updated_at": "2018-09-20T02:02:16"
    }
}