Create a loopback Interface

[Chubak_Igor]

Task Extreme?

Create a loopback Interface?
interface loopback 1
IP address 192.168.1.1 255.255.255.0

Create Interface vlan 101
IP address (loopback 1)

Interface vlan 102
IP address (loopback 1)

Interface vlan 103
IP address (loopback 1)

Example Cisco:
interface loopback 1
IP address 192.168.1.1 255.255.255.0
interface vlan 101
IP unnumbered loopback 1

Interface vlan 102
IP unnumbered loopback 1

Interface vlan 103
IP unnumbered loopback 1

[Chubak_Igor]

one IP address to several vlan

[An-Tin_Liu]

can i ask a question? why to do that?

[_up__bb_]

create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
Roberto

[Vladimir_Chukov]

Ip unnumbered can be done via Super-Vlan in ExtremeXOS.

https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-subvlan-with-super-vlan

[Stephane_Grosj1]

IP unnumbered is not supported on EXOS.
For a loopback, you want to have a /32 (IPv4).