GTM issue - GTM on v11.3 and LTMs on v10.2.1 with route domains

Hi all,

We just upgraded our GTMs to v11.3 HF7 from 10.x since we had a requirement to run route domains on the LTMs. I created a new partition with a default route domain on the LTM.

I have added the LTM server on the GTM (using Self-IPs from the new route domain network). When I add the Virtual server object under the server in the GTM, it is marking it offline.

I see the following log in /var/log/gtm : Aug 26 10:54:16 esgtmlab4 alert gtmd[8759]: 011ae0f2:1: Monitor instance /Common/bigip 10.151.67.77:443 UNKNOWN_MONITOR_STATE --> DOWN from /Common/ESGTMLAB5 (no reply from big3d: timed out)

Your help is appreciated.

Thanks!