[j-nsp] Logging interface flaps

[Samit]

Hi,

How do I log the interface flap logs similar to cisco log attached
below,  in Juniper M7i?

Dec  3 18:26:04.155 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS2/0, changed state to down
Dec  3 18:26:04.375 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS3/0, changed state to down
Dec  3 18:26:05.711 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS1/0, changed state to down
Dec  3 18:29:04.551 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS2/0, changed state to up
Dec  3 18:29:04.551 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS3/0, changed state to up
Dec  3 18:29:05.835 NST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
POS1/0, changed state to up

I tried this but not getting any logs during the link flap.

[edit interfaces]

traceoptions {
    file int-log size 1m files 5;
    flag change-events;
    flag config-states;
}
so-0/1/0 {
    description "Link1 ";
    traceoptions {
        flag all;
    }

so-0/1/1 {
    description "Link2 ";
    traceoptions {
        flag all;
    }
so-0/1/2 {
    description "Link3 ";
    traceoptions {
        flag all;
    }

Regards,
Samit