Establish relationship between two Jenkins Jobs available on different Jenkins server
You can use Jenkins API for remote trigger of Job.Say you have job on DEV_JOB on JENKINS_1, add a penultimate step(or upstream/downstream project having only this step) which invokes TEST_JOB using remote API call of JENKINS_2 server.Example command would be
$(curl --user "username:password" "http://JENKINS_2/job/TEST_JOB/buildWithParameters?SOMEPARAMETER=$SOMEPARAMETER")
username:password is a valid user on JENKINS_2. Avoid using your own account here but rather a 'build trigger' account that only has permissions to start those jobs.