Interface must already be defined

尝试在JunOS上的VLan中添加第3层路由接口(l3接口)时遇到此错误？

root@EX4200# set vlans v1000 l3-interface vlan.1000
root@EX4200# commit comment "add l3-iface to vlan 1000"
[edit vlans v1000 l3-interface]
'l3-interface vlan.1000'
Interface must already be defined under [edit interfaces]
error: commit failed: (statements constraint check failed)
[edit]
root@EX4200#

这意味着该VLan上没有设置IP子网，例如：

set interfaces vlan unit 1000 family inet address 0.0.0.0/00