Micetro manages failover relationships at both the scope and server levels. Scopes group IP addresses logically and help to manage failover efficiently. You can customize DHCP configurations per scope to suit the specific requirements of different network segments.
When adding failover relationships for Microsoft (MS) DHCP servers, scopes are not added to the relationship. Instead, you must add the scopes later using the Add scope to failover action.
You can add failover relationships either in the Web Application or through the API.
Adding a failover relationship in Micetro
To add a failover relationship for MS DHCP in Micetro:
- On the Admin page, select the Service management tab.
- In the left sidebar, under DHCP services, select Microsoft DHCP.
- Select the server that you want as the primary server in the failover relationship.
- Use either the Action or Row … menu to select Manage failover.
- Select + Add relationship.
- In the Initial setup step, enter the following information:
- Failover name: The name for the relationship.
- Failover mode: Select the failover mode you want to use, e.g., Hot standby and Load balance.
- Partner server: Select the partner server for the failover configuration.
Then select Next.
- In the Options step, enter the following information:
- Local server load balance percentage: If you selected the Load balance mode, you must specify the load balance percentage for the local server. The remaining percentage will be used on the partner server.
- Addresses reserved for standby server: If you selected the Hot standby mode, you must set the percentage of addresses reserved for the standby server.
- Maximum client lead time: Enter a value, in seconds, if different from the default.
- State switchover interval: Specify an interval, in seconds, for Automatic State Switchover. If you set the value to zero, Automatic State Switchover is disabled.
- Shared secret for message authentication: If you want to use message authentication between the DHCP servers, you must enter a shared secret for the message authentication.
- After confirming the details on the Summary tab, select Add.
Adding a failover relationship through the API
To create a failover relationship through the API:
Use the AddDHCPFailoverRelationship command, which uses the
following parameters:
- Name: The name of the DHCP failover relationship to be created.
- PrimaryServer: The name of the primary DHCP server as it appears in Micetro.
- SecondaryServer: The name of the secondary DHCP server as it appears in Micetro.
- FailoverMode: The DHCP failover mode to use, e.g., Hot Standby or Load Balancing.
- Mclt: Specify the number of seconds for which either server can renew a lease without contacting the other.
- SafePeriod: Safe period time, in seconds, that the DHCPv4 server will wait before transitioning the server from the COMMUNICATION-INT state to PARTNER-DOWN.
- Percentage: Indicates the percentage of the DHCPv4 client load that will be shared between the primary and secondary servers in the failover relationship.
- SharedSecret: The shared secret key associated with this failover relationship.