About Redirecting Traffic to Upgrade or Remove an MRA

When the software for an MRA needs to be upgraded or an MRA needs to be removed from an MRA cluster, the traffic or potential traffic must be redirected to the other MRA within the cluster, and the current sessions released. To do this, traffic on clustered MRAs is redirected on to another MRA, allowing the traffic-free MRA to be replaced in the cluster or to have its software upgraded. During this process, the MRA to be replaced or updated is placed in a redirect state of ALWAYS, where it does not take on new subscribers but redirects them to the other MRA. When all traffic has been removed or redirected, existing traffic is released from the MRA and it is shut down. After the MRA is replaced or upgraded, the same process can be used on the other MRA, and then returned to the cluster.

Note: For detailed directions on performing a migration using the redirect states, contact Oracle.