# Configure the Resiliency List (MiNet Fallback Addresses)

When a MiNet 53xx device powers on or reboots, it will attempt to reach a TFTP server to obtain new firmware. Once connected to a TFTP server, the set downloads and installs new software if required. When the download attempt is complete, the set then attempts to connect to an MBG, searching for nodes as follows:

1. Resiliency List—If the device has previously connected to MBG and received the Resiliency List (programmed using this procedure), it will search the list from top to bottom to obtain a connection.
2. Teleworker IP—If the device has a Teleworker IP address (programmed by pressing 7 key on bootup on most phones), it will use it to obtain a connection.
3. DHCP—If all other connection methods fail, the device will attempt to obtain a connection from DHCP.

The Resiliency List of MiNet fallback addresses is optional. If you do not configure it, the devices will use the values they have been programmed with or obtain an address from DHCP.

The Resiliency List supports the following features:

- Up to four node addresses can be configured.
- Node addresses can be in IPv4 or IPv6 format.
- Node addresses can be for any MBG, not just local MBGs. However, in a clustered environment, the addresses should be for nodes in the device's own cluster zone.
- Devices search the list from top to bottom (first to fourth node) until a connection is made.

This feature is useful if you need to configure failover addresses. For example, if your enterprise is switching service providers, program a Resiliency List that contains MBG's current IP address plus the one that you will be using with the new provider. Then the devices in order to have them download these values. When the switchover to the new service provider occurs, the devices will attempt to connect to the original address and fail, and then try to connect to the new address and succeed. After completing this process, you can remove the original address from the Resiliency List.

Note:

- When changes are made to the resiliency list on MBG, the sets will receive the updates to store in FLASH memory the next time they reboot.
- The Resiliency List is only available for use by 53xx Series MiVoice IP Phones with FLASH memory. Other device types cannot make use of the Resiliency List.
- In a clustered environment, Mitel recommends populating the Resiliency List with nodes in the device's own cluster zone. If the cluster is spread across a subnet boundary, include nodes from each subnet to prevent a single point of failure.
- The Resiliency List can be used without clustering.

To configure the Resiliency List:

1. On the MBG main page, click the Network tab and click MiNet fallback addresses.
2. For each of the four “boot” MBG IP addresses, do the following:
   - Select an Address suggestion - OR -
   - Enter a Configured Address in IPv4 or IPv6 format

3. Click Save.

Parent topic: System Configuration
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