F5-link controller not show active link in F5 standy, but in F5 active show link up.

 

Hi, We need a issues With own cluster LC(active-Passive). In my F5 LC active link in my link list show me in status UP, but in F5 LC Standby this show me in status Down (image). We did many test and configuration like change synchronization and other thing, but this link in F5 standby not get up. Tranks for you support.