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

[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

[dflouret]

Igor,

That's not possible. DHCP server only serves the vlan it belongs to. And each vlan has to have its own IP address.

[Chubak_Igor]

DHCP
server dhcp-pull 192.168.1.0/24 vlan 102
server dhcp-pull 192.168.2.0/24 vlan 103

vlan-102 120 subscribers
vlan-103 250 subscribers

I want to make
server dhcp-pull 192.168.1.0/23 vlan 101

create vlan "vlan101"
enable loopback-mode vlan vlan101
configure vlan vlan101 ipaddress 192.168.1.1 255.255.254.0
enable ipforwarding vlan vlan101

create vlan "vlan102"
configure vlan vlan102 tag 102
#use the ip address vlan 101
#cisco: ip unnumbered

create vlan "vlan103"
configure vlan vlan103 tag 103
#use the ip address vlan 101
#cisco: ip unnumbered

extreme???

[dflouret]

Igor,

Each vlan has to have its own ip address. If you want to have a loopback address for the whole switch then:

• Select one of the vlans in the switch and enable loopback-mode
• assign loopback ip address
• assign ip addresses to all other vlans
• enable ipforwarding in all vlans

If you want to have a loopback IP address that does not belong to any of the existing vlans, just create a vlan with no ports, enable loopback-mode and assign an ip address.