There are many good reasons why organisations have multiple Jira instances. However, for many of them this is causing more and more of a headache:
The users have to switch between different instances to track their projects. The organisations started to migrate / merge different Jira instances. They implemented automated synchronisations with different technologies. A lot of compromises had to be made, sacrificing some of the freedom of the individual instances.
With Fedration for Jira you don't have to worry any more!
Use your multiple Jira instances from one driver-seat.
Application Links
All The communication of Federation for Jira between your different Jira instances is based on Application Links. This is a common concept from Atlassian, across most of their products.
Application Links
To build your Jira Federation, all you need are application links between your Jira instances.
...
Afterwards, you can install the Federation for Jira app on each Jira instance, where you would like to use its functionality. It requires a license for each instance where you install iotit. But it will integrate all your Jira instances in your Federation, even those without the app installed.
...
You decide to install the Federation for Jira app only on Jira 1. You can now need a license for the Federation for Jira app only on Jira 1. Now you can use functionality of Federation for Jira, such as /wiki/spaces/FED/pages/12386528 on a dashboard of Jira 1. This will provide you search results across your whole federation. The results displayed on the dashboard of Jira 1, will include issues from all your 3 Jira instances: Jira 1, Jira 2 and Jira 3.
...