After the upgrade the 21.4L4.17, in some compute vrouter agent comes up with a wrong physical interface
Contrail-status complains about no connection to controllers.
This is fixed in 21.4.L4.76
Refer https://supportportal.juniper.net/s/article/Charms-and-RHOSP-based-Contrail-upgrades-to-21-4-L4-using-ZIU-and-IPU-will-have-issues?language=en_US for details