Dummy interfaces are much like the loopback interface, except you can have as many as you want. Dummy interfaces can be used as interfaces that always stay up (in the same fashion to loopbacks in Cisco IOS), or for testing purposes.

Configuration commands:

[email protected]# set interfaces dummy dum0
Possible completions:
+  address      IP address
   description  Interface description
   disable      Disable interface
 > ip           IPv4 routing parameters
 > ipv6         IPv6 routing parameters
   redirect     Incoming packet redirection destination
 > traffic-policy
                Traffic-policy for interface