VLANs

VLAN support is the base of the switching model. netverdict tracks VLAN membership, access/trunk behaviour, native VLAN handling, allowed VLAN lists, and SVI-backed L3 reachability.

Support level

Area	Level	Notes
VLAN database	Supported	VLAN IDs and names are stored and emitted.
Access ports	Supported	Untagged ingress maps into the configured access VLAN.
802.1Q trunks	Supported	Allowed VLAN lists and native VLAN behaviour.
SVIs	Supported	VLAN interfaces can provide routed gateways.
Private VLANs	Not modelled	Out of scope today.

Standards coverage

Standard	Coverage	Notes
IEEE 802.1Q	Behaviour model	Tagged/untagged VLAN forwarding and trunk membership.

Feature matrix

Feature	Status	Notes
vlan <id>	Supported	Creates VLAN.
VLAN name	Supported	Metadata / config emission.
switchport mode access	Supported	Access VLAN behaviour.
switchport access vlan <id>	Supported	Assigns access VLAN.
switchport mode trunk	Supported	Enables trunk behaviour.
switchport trunk allowed vlan	Supported	Filters tagged VLANs.
Native VLAN	Supported	Untagged trunk traffic maps to native VLAN.
SVI	Supported	interface VlanX participates in routing.

Vendor command matrix

Command	IOS-style	Junos-style	VyOS-style	Notes
vlan 10	Supported	Partial	Partial	VLAN definition.
switchport access vlan 10	Supported	n/a	Partial	Access membership.
switchport trunk allowed vlan 10,20	Supported	n/a	Partial	Trunk filtering.
set vlans USERS vlan-id 10	n/a	Supported	n/a	Junos commit creates canonical VLAN entry.
set interfaces ge-0/0/0 unit 0 family ethernet-switching interface-mode access	n/a	Supported	n/a	Junos access mode.
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode trunk	n/a	Supported	n/a	Junos trunk mode.
set interfaces ge-0/0/1 native-vlan-id 10	n/a	Supported	n/a	Junos native VLAN.
show vlan brief	Supported	Partial	Partial	VLAN membership view.
show interfaces trunk	Supported	Partial	Partial	Trunk state view.

Behaviour notes

Switching decisions use VLAN as part of the bridge-domain key. MAC learning in VLAN 10 never satisfies forwarding in VLAN 20.

Examples

Canonical example

configure terminal
vlan 10
 name USERS
interface GigabitEthernet0/1
 switchport mode access
 switchport access vlan 10
interface GigabitEthernet0/24
 switchport mode trunk
 switchport trunk allowed vlan 10,20
end
show vlan brief

Vendor styles

IOS-style

vlan 10
 name USERS
interface GigabitEthernet0/1
 switchport mode access
 switchport access vlan 10

Junos-style

set vlans USERS vlan-id 10
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode access
set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members USERS

VyOS-style

set interfaces ethernet eth1 vif 10 description USERS
set interfaces ethernet eth1 vif 10 address 10.0.10.1/24

Known limits

Private VLANs, QinQ, dynamic trunk negotiation fidelity, and vendor-specific VLAN database file behaviour are not modelled.