Avaya DECT R4 Installation And Administration Manual page 28

Avaya IP-DECT System Description
Description of Mirror Mode
Mirror Masters are configured in pairs in the same way as Active and Standby Masters are. A
Mirror Master can act in both the two previous modes, Active and Standby. One Mirror will
initially take the Active role while the other Mirror becomes the Standby. Both the previously
used modes "Active" and "Standby" can now instead be set to "Mirror". It is not possible to mix
the Mirror mode with any other modes, both masters must be set to Mirror.
The administrator decides which Mirror that initially should be the active one by clicking on the
"Activate mirror" link in that device. When the active Mirror fails, the Mirror acting as the standby
will automatically become the active Mirror. When the failing Mirror is in operation again it will
take the role as the standby and stay inactive.
The administrator can, when both Mirrors are in operation, switch the active role by clicking on
the "Switch active mirror" link. This should then be done within a maintenance window as all
ongoing calls will be lost.
In the special case where both Mirrors become active due to a network error between the
Mirrors, conflicts might arise when the connection between the Mirrors is established again. In
this case the Mirror that became active most recently will "win" and changes made to the other
mirror will be lost.
The LDAP replication of the user database between Mirrors will be done automatically when
needed and no configuration of this is necessary when using the Mirror mode.
If LDAP replication is also used towards an IP6000 or an Active Directory this must be
configured at both Mirrors. This replicator will be disabled automatically when the Mirror is
inactive.
The Mirror mode will not affect the communication towards the IP-PBX except for the change of
master IP address after a fail over.
Benefits With Mirror Mode Compared to Standby Mode
Note: For new installations we recommend to use the Mirror mode.
The functionality will not be limited when failing over to the Mirror that has acted as Standby. It
will still be possible to add/edit/delete users, login/logout shared phones and subscribe new
handsets. With the Standby mode this is not possible.
When the failing Mirror becomes available again the system will not automatically fall back to
this Mirror and this is not necessary from a functional point of view. If the administrator anyway
wants this to happen it is possible to manually switch back to the previously active Mirror. This
should then be done at an appropriate time as ongoing calls will be lost. With the Standby mode
the fallback is uncontrolled and can be brutal as ongoing calls are lost.
The LDAP replication of users will be done automatically when needed and no configuration of
this is necessary with the Mirror mode.
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Avaya DECT R4 - System Description 02/2016