Training and Certification

Hello,

Please suggest the way if i can create multiple loopback unit on master routing instance, if i am trying to do so i am getting below error.

[edit]
root@R1# set interfaces lo0 unit 1 family inet address 10.10.1.1/24

[edit]
root@R1# commit check
[edit interfaces lo0]
'unit 1'
if_instance: Multiple loopback interfaces not permitted in master routing instance
error: configuration check-out failed

Hello,

This is not supported. BUT - You can add multiple IP addresses to the same unit:

set interfaces lo0 unit 0 family inet address 10.10.2.1/24
set interfaces lo0 unit 0 family inet address 172.16.1.1/24
set interfaces lo0 unit 0 family inet address 192.168.1.1/24

HTH

Thx

Alex

Hello,

As mentioned in the below juniper document "Only unit 0 is permitted as the master loopback interface. If you want to add more IP addresses to unit 0, you configure them in the normal way under unit 0".

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/loopback-interface.html 

In the below snapshot, adding multiple addresses under unit 0 doesn't give any error on commit check. However, when we add another unit junos doesn't accept it : "Multiple loopback interfaces not permitted in master routing instance". Another loopback unit is permitted under a routing instance.

lab@R1# set interfaces lo0 unit 0 family inet address 2.2.2.2

[edit]
lab@R1# set interfaces lo0 unit 0 family inet address 3.3.3.3

[edit]
lab@R1# commit check
configuration check succeeds

[edit]
lab@R1# set interfaces lo0 unit 1 family inet address 5.5.5.5

[edit]
lab@R1# commit check
[edit interfaces lo0]
'unit 1'
if_instance: Multiple loopback interfaces not permitted in master routing instance
error: configuration check-out failed

Regards,
Rahul

Please mark my solution as accepted if it helped.