Perform the following in the Azure Console:

1. Go to Redis Caches.
2. For each Redis Cache:
3. Make sure you have at least 2 Redis Caches in the Premium tier.
4. Click on Geo-replication
5. Click Add cache replication link
6. Click the name of the desired secondary cache from the Compatible caches list.
7. Click the 3 dots on the right to open the context menu.
8. Select Link as secondary.
9. Select Link.

Default Values:
No linked

References:

1. https://docs.microsoft.com/en-us/azure/redis-cache/cache-how-to-geo-replication
2. https://azure.microsoft.com/en-us/blog/azure-redis-cache-geo-replication-is-now-generally-available/