Create a loopback Interface

  • 23 October 2015
  • 11 replies
  • 3383 views

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


11 replies

Userlevel 2
create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
[/code]Roberto
bb¥">create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
[/code]Roberto
ok.

create vlan "vlan101"
enable loopback-mode vlan vlan101
configure vlan vlan101 ipaddress 192.168.1.1 255.255.255.0
enable ipforwarding vlan vlan101

create vlan "vlan102"
configure vlan vlan102 tag 102
//Necessary
IP address loopback used on vlan

bb¥">create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
[/code]Roberto
Cisco: example
Interface vlan 102
IP unnumbered loopback 1

Extreme???????????????

Userlevel 7
bb¥">create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
[/code]Roberto
IP unnumbered is not supported on EXOS.
For a loopback, you want to have a /32 (IPv4).
bb¥">create a new vlan
and after configure loopbback on this vlan.

enable loopback-mode vlan name
[/code]Roberto
Ip unnumbered can be done via Super-Vlan in ExtremeXOS.

https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-subvlan-with-super-vlan
Userlevel 1
can i ask a question? why to do that?
one IP address to several vlan
Userlevel 6
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.

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???
Userlevel 6
Igor,

That's not possible. DHCP server only serves the vlan it belongs to. And each vlan has to have its own IP address.
IP unnumbered can be done via Super-Vlan in ExtremeXOS.

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

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