## HA/Master Config

The HA/Master Config tab allows you to associate a certificate object with a Screen or Administration Station that is part of

- an HA group
- a Centralized Management group

The High Availability menu and the Primary Name menu determine the role a Screen has within an HA and Centralized Management group. The settings you choose for these menus determine which other controls on the HA/Master Config tab are active.

The following table identifies the roles a Screen can have and the options you specify for the High Availability and Primary Name menus.

The Screen's Role | High Availability | Primary Name
--- | --- | ---
Standalone | No | None
HA Primary and Standalone | Primary | None
HA Primary and Centralized Management Secondary | Primary | Name of Primary Screen for Centralized Management Group
HA Primary and Centralized Management Primary | Primary | None
Centralized Management Secondary | No | Screen name
Centralized Management Primary | No | None
HA Secondary | Secondary | Name of HA Primary

The meanings and uses of the fields in the HA/Master Config tab are as follows:

- High Availability Specifies whether the Screen is used for High Availability. If you are using it for HA, you can specify whether the Screen is a Primary HA Screen or a Secondary HA Screen.
- Primary Name Specifies the name of the Primary Screen.
- Administrative IP Address Specifies the IP address of the Screen that is used for administration.
- Administration Certificate Specifies the Administration Station's certificate name.
- High Availability IP Address Specifies the IP address of the HA interface.
- Ethernet Address Generated by the system.
- Key Algorithm Specifies the key encryption algorithms supported for SKIP version 1.
- Data Algorithm Specifies the data encryption algorithms supported for SKIP version 2.
- MAC Algorithm Specifies the MAC (authentication) algorithms supported for manual keying.

Notes:

- The entry in the Name field must be the same as the entry that exists in the nameservice lookup or in the /etc/hosts file.
- The IP address associated with this name must match the IP address of the administrative interface.