What sort of interfaces would be represented by an IANA ifType of l3ipvlan(136)?

On a router, switch, or similar network device with interfaces implementing the ifType mib, what exactly is meant by an ifType of l3ipvlan? I can see the phrase "Layer 3 Virtual LAN using IP" readily enough, but I'm not sure what the implications of that are, as it's not a networking object I'm familiar with. (I mean, I know what a 802.1Q VLAN is, but not layer 3.)

...
 atmSubInterface (134),  -- ATM Sub Interface
 l2vlan (135),           -- Layer 2 Virtual 开发者_开发技巧LAN using 802.1Q
 l3ipvlan (136),         -- Layer 3 Virtual LAN using IP
 l3ipxvlan (137),        -- Layer 3 Virtual LAN using IPX
 digitalPowerline (138), -- IP over Power Lines 
 mediaMailOverIp (139),  -- Multimedia Mail over IP
...

I found a document with certain technical references, but it didn't have anything I could comprehend:

 Registry:
 Decimal   Name          Description                      Reference
 -------   ------------  -------------------------------  ---------
       1   other         none of the following            [RFC1213]
       2   regular1822   BBN Report 1822                  [RFC1213]
       3   hdh1822       BBN Report 1822                  [RFC1213]
 ...
     135   l2vlan      Layer 2 Virtual LAN using 802.1Q             [MacFaden]          
     136   l3ipvlan    Layer 3 Virtual LAN - IP Protocol            [MacFaden]          
     137   l3ipxvlan   Layer 3 Virtual LAN - IPX Prot.              [MacFaden]  

IPVLAN is similar to MACVLAN with the difference being that the endpoints have the same MAC address.

See https://developers.redhat.com/blog/2018/10/22/introduction-to-linux-interfaces-for-virtual-networking#ipvlan.

All interfaces are of a specific type. This is just a description of available types. In your example, you give a IANA Interface Type of l3ipvlan, which means that if you were to SNMP Get from an SNMP Agent with such a device, you would get a value of 136, which you should interpret as l3ipvlan.