I set the gloabl MTU per your command and that worked fine. I then tried setting the MTU for vlan 123 and I get the message "Family MTU is too large relative to device MTU error: configuration check-out failed"
vlan {
mtu 9216;
unit 80 {
family inet {
address 10.121.80.1/20;
}
}
unit 123 {
family inet {
mtu 9200;
address 10.121.123.1/24;
}
}
unit 124 {
family inet {
address 10.121.124.1/24;
}
}