While assiging IP-to-IP to tunnel interface, the link state is 'DOWN'

Issue

• IPIP Tunnel interface was setup and IP is assigned using the command:

$ip tunnel add ip.tun1 mode ipip local 172.16.1.10 remote 10.1.1.1
$ip addr add dev ip.tun1 192.168.10.1/24 peer 192.168.10.2

     $ip link
     6: ip.tun1: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN   <<<<<
     link/ipip   172.16.1.10  peer  10.1.1.1