Topic: Gre Tunnel KEY Config Problem

Hi everyone!
i config this file '/etc/config/network' and added a gre interface

i added gre interface followed this url

config interface 'gre'
        option proto    'gre'
        option zone     'vpn'
        option peeraddr ''
        option mtu      '1400'
        option ttl      '64'
        option ikey     '100'
        option okey     '100'

config interface 'gre1'
        option proto    'static'
        option ifname   '@gre'
        option ipaddr   ''
        option netmask  ''

i configed the key 100 ,and restart the network , but when i use 'ip tunnel show' the gre key is not 100,

root@openwrt:~# ip tunnel show
gre0: gre/ip  remote any  local any  ttl inherit  nopmtudisc
gre-gre: gre/ip  remote any  local  ttl 64  key 1677721600

what is the problem ?