Layer3 Subinterface Configuration Object

Overview

The Layer3Subinterface class manages Layer 3 subinterface objects in Palo Alto Networks' Strata Cloud Manager. Layer 3 subinterfaces operate at the network layer, supporting IP routing on VLAN-tagged traffic. They support static IP addressing or DHCP.

Core Methods

Method	Description	Parameters	Return Type
`create()`	Creates a new Layer 3 subinterface	`data: Dict[str, Any]`	`Layer3SubinterfaceResponseModel`
`get()`	Retrieves a Layer 3 subinterface by ID	`object_id: str`	`Layer3SubinterfaceResponseModel`
`update()`	Updates an existing Layer 3 subinterface	`subinterface: Layer3SubinterfaceUpdateModel`	`Layer3SubinterfaceResponseModel`
`list()`	Lists Layer 3 subinterfaces with optional filtering	`folder`, `snippet`, `device`, plus filters	`List[Layer3SubinterfaceResponseModel]`
`fetch()`	Fetches a single Layer 3 subinterface by name within a container	`name: str`, `folder`, `snippet`, `device`	`Layer3SubinterfaceResponseModel`
`delete()`	Deletes a Layer 3 subinterface by ID	`object_id: str`	`None`

Layer3 Subinterface Model Attributes

Attribute	Type	Required	Default	Description
`name`	str	Yes	None	Interface name (e.g., "ethernet1/1.100")
`id`	UUID	Yes*	None	Unique identifier (*response/update only)
`tag`	str	Yes	None	VLAN tag (1-4096)
`comment`	str	No	None	Description. Max 1023 chars
`ip`	List[StaticIp]	No**	None	Static IP addresses
`dhcp_client`	DhcpClient	No**	None	DHCP client configuration
`mtu`	int	No	1500	MTU (576-9216)
`interface_management_profile`	str	No	None	Management profile name. Max 31 chars
`arp`	List[ArpEntry]	No	None	Static ARP entries
`ddns_config`	DdnsConfig	No	None	Dynamic DNS configuration
`folder`	str	No***	None	Folder location. Max 64 chars
`snippet`	str	No***	None	Snippet location. Max 64 chars
`device`	str	No***	None	Device location. Max 64 chars

* Only required for update and response models * Only one IP mode (static or DHCP) can be configured ** Exactly one container must be provided for create operations

IP Addressing Modes

Static IP

subinterface_data = {
    "name": "ethernet1/1.100",
    "tag": "100",
    "ip": [{"name": "192.168.100.1/24"}],
    "mtu": 1500,
    "folder": "Interfaces"
}

DHCP

subinterface_data = {
    "name": "ethernet1/1.100",
    "tag": "100",
    "dhcp_client": {
        "enable": True,
        "create_default_route": True,
        "default_route_metric": 10
    },
    "folder": "Interfaces"
}

Exceptions

Exception	HTTP Code	Description
`InvalidObjectError`	400	Invalid data or parameters
`MissingQueryParameterError`	400	Missing required parameters
`ObjectNotPresentError`	404	Interface not found
`AuthenticationError`	401	Authentication failed
`ServerError`	500	Internal server error

Basic Configuration

from scm.client import ScmClient

client = ScmClient(
    client_id="your_client_id",
    client_secret="your_client_secret",
    tsg_id="your_tsg_id"
)

layer3_subinterfaces = client.layer3_subinterface

Usage Examples

Creating Layer3 Subinterfaces

# Create with static IP
static_subinterface = {
    "name": "ethernet1/1.100",
    "tag": "100",
    "comment": "VLAN 100 Gateway",
    "ip": [{"name": "192.168.100.1/24"}],
    "mtu": 1500,
    "interface_management_profile": "allow-ping",
    "arp": [
        {"name": "192.168.100.10", "hw_address": "00:11:22:33:44:55"}
    ],
    "folder": "Interfaces"
}

result = client.layer3_subinterface.create(static_subinterface)
print(f"Created: {result.id}")

# Create with DHCP
dhcp_subinterface = {
    "name": "ethernet1/2.200",
    "tag": "200",
    "dhcp_client": {
        "enable": True,
        "create_default_route": False
    },
    "folder": "Interfaces"
}

result = client.layer3_subinterface.create(dhcp_subinterface)

Retrieving Layer3 Subinterfaces

# Fetch by name
subinterface = client.layer3_subinterface.fetch(
    name="ethernet1/1.100",
    folder="Interfaces"
)
print(f"Found: {subinterface.name}, VLAN: {subinterface.tag}")

# Get by ID
subinterface_by_id = client.layer3_subinterface.get(subinterface.id)

Updating Layer3 Subinterfaces

existing = client.layer3_subinterface.fetch(
    name="ethernet1/1.100",
    folder="Interfaces"
)

# Update MTU
existing.mtu = 9000

# Add static ARP entry
if existing.arp is None:
    existing.arp = []
existing.arp.append({"name": "192.168.100.20", "hw_address": "00:11:22:33:44:66"})

updated = client.layer3_subinterface.update(existing)

Listing Layer3 Subinterfaces

# List all Layer 3 subinterfaces
subinterfaces = client.layer3_subinterface.list(folder="Interfaces")

for sub in subinterfaces:
    print(f"Name: {sub.name}, VLAN: {sub.tag}")
    if sub.ip:
        for ip in sub.ip:
            print(f"  IP: {ip.name}")

# Filter by VLAN tag
vlan100 = client.layer3_subinterface.list(folder="Interfaces", tag="100")

# Filter by MTU
jumbo = client.layer3_subinterface.list(folder="Interfaces", mtu=9000)

Deleting Layer3 Subinterfaces

client.layer3_subinterface.delete("123e4567-e89b-12d3-a456-426655440000")

Managing Configuration Changes

result = client.commit(
    folders=["Interfaces"],
    description="Updated Layer 3 subinterfaces",
    sync=True
)

Error Handling

from scm.exceptions import InvalidObjectError

try:
    subinterface = client.layer3_subinterface.create({
        "name": "ethernet1/1.100",
        "tag": "100",
        "ip": [{"name": "192.168.100.1/24"}],
        "dhcp_client": {"enable": True},  # Error: both modes
        "folder": "Interfaces"
    })
except InvalidObjectError as e:
    print(f"Invalid configuration: {e.message}")

Best Practices

IP Mode - Choose only one IP addressing mode (static or DHCP)
VLAN Planning - Coordinate VLAN tags with network infrastructure
MTU - Consider jumbo frames (9000) for high-throughput VLANs
ARP Entries - Add static ARP for critical devices
Management Profile - Apply appropriate management profiles