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1. Choose Network > High Availability. You can also choose Network > VLAN and click the High Availability link provided on the VLAN Configuration page.

2. Configure settings using the information in the following table as a guide. When you have finished configuring settings, click Submit to make your changes take effect.

   Caption
   0 Table 1 High Availability Configuration Parameters
   Item Description Interface Addresses Displays information about the LAN and WAN interfaces currently running on the system. Local State Displays the state of all high availability services. The system is configured to send status updates to the other system by specifying the IP addresses of that other system on a per-link basis. Click Refresh the status for updated information. Administratively Disabled Sets the system state to be administratively down. This causes the system to give up service and not attempt to retake the active state. This can be used for maintenance, configuration changes, or upgrading system upgrades and testing the system. Administratively Disabled Disables the system administratively. Note: Enabling this check-box checkbox causes the other system to take over. If there is no other system, voice services are disrupted. While the system is in this mode, it will not take over for the other system in case of a failure. High Availability Settings Controls High Availability behavior. Note: Changing these settings disrupts service. Make sure that all systems in the group are configured in a compatible way. Enable High Availability Select the Enable High Availability check-box. Enable Virtual MAC Select the Enable Virtual MAC check-box to allow hot redundancy switchover to the standby device. Note: Virtual MAC (VMAC) is required for IPv6 support. IPv6 HA for VMAC is only supported on some  Spacevars 0 product2 platforms. Enable Revertive Mode Select the Enable Revertive Mode check-box to revert to the higher priority host. Enable HA DHCP    Select the Enable HA DHCP check-box to maintain a single DHCP lease database between the Primary and Secondary systems for seamless failover. This avoids running independent DHCP servers on each system, which could potentially cause IP address conflicts. You must enable State Transfer on at least one interface by selecting the Enable State Transfer check-box checkbox. Designation Select the Primary or Secondary radio button to designate one system as the primary system or secondary system. • Primary • Secondary Instance ID Enter the instance ID. Both systems in the same group should have the same instance ID and must be unique for that group in order to not cause multiple groups on the same network to disrupt each other. Multiple HA Spacevars 0 product2 instances are supported with the same ID on the same network. Password Enter a password to be used by the systems in the group. The password must be the same on all systems. Virtual VLAN Settings Configure Virtual VLAN IP Addresses on the VLAN Configuration page. Choose Network > VLAN and refer to Configure VLAN Support. Note: IPv4 Virtual IP addresses are mandatory even if only IPv6 failover is desired. LAN IF Virtual IP Address Enter the virtual IPv4 address to be shared between the two systems. This IPv4 address must be in the same subnet as the physical LAN IPv4 address configured on the Network page. The virtual IPv4 address may also be used to manage the system with HTTPS, HTTPS, Telnet, SSH, and SNMP. The system performs a gratuitous ARP for the virtual IP as the physical LAN MAC address of the system when an activity switch occurs, and the system assumes the active role. Note: Some routers' ARP caches may not reflect the new MAC address for the virtual IPv4 address and may require a period of time to store and forward traffic to the active system. In rare cases, the upstream router may require the ARP cache to be flushed to store the new MAC address as the virtual IP owner. LAN IF Virtual IPv6 Address Enter the virtual IPv6 address to be shared between the two systems. WAN IF Virtual IP Address Enter the virtual IPv4 address to be shared between the two systems. This IPv4 address must be in the same subnet as the physical WAN IPv4 address configured on the Network page. The virtual IPv4 address may also be used to manage the system with HTTPS, HTTPS, Telnet, SSH and SNMP. The system performs a gratuitous ARP for the virtual IP as the physical WAN MAC address of the system when an activity switch occurs, and the system assumes the active role. Note: Some routers' ARP caches may not reflect the new MAC address for the virtual IPv4 address and may require a period of time to store and forward traffic to the active system. In rare cases, the upstream router may require the ARP cache to be flushed to store the new MAC address as the virtual IP owner. WAN IF Virtual IPv6 Address Enter the virtual IPv6 address to be shared between the two systems. SECONDARY-WAN IF Virtual IP Address This field is visible only when WAN Link Redundancy is enabled. Enter the virtual IPv4 address to be shared between the two systems. This IPv4 address must be in the same subnet as the physical WAN IPv4 address configured on the Secondary WAN page. The virtual IPv4 address may also be used to manage the system with HTTP, HTTPS, Telnet, SSH, and SNMP. The system performs a gratuitous ARP for the virtual IP as the physical WAN MAC address of the system when an activity switch occurs, and the system assumes the active role. SECONDARY-WAN IF Virtual IPv6 Address This field is visible only when WAN Link Redundancy is enabled. Enter the virtual IPv6 address to be shared between the two systems. This IPv6 address must be in the same subnet as the physical WAN IPv6 address configured on the Secondary WAN page. The virtual IPv6 address may also be used to manage the system with HTTP, HTTPS, Telnet, SSH, and SNMP. LAN Monitor Port This field enables the support of LAN port link detection. Choose the port from the drop-down list. LAN IF Remote Address Enter the LAN interface remote address or subscriber remote address. This is the actual address of the other system on this interface used to connect to the other system and transfer state information. Tip: Select the Enable State Transfer check-box checkbox if you want state transfer to take place over this link. Enable State Transfer Select the Enable State Transfer check-box checkbox to select another interface to facilitate stateful failover. If you enable state transfer for multiple links, you have a higher chance of successful state transfer during link failures. Note: State transfer causes extra network traffic on that link. For example, if suppose you only enable state transfer on the LAN/Subscriber interface, and this link fails, causing the Secondary system to become active. In that case, the Primary system will now no longer be able to receive state updates. So, if the link is restored, the Primary system takes over without a full complete state transfer. To prevent this, enable state transfer on the WAN/Provider interface and the management interface as well to ensure that state transfer is successful during link failure. WAN IF Remote Address Enter the WAN remote address or provider remote address. This is the actual address of the other system on this interface. This is used to connect to the other system and transfer state information. Tip: Select the Enable State Transfer check-box checkbox if you want state transfer to take place over this link. Enable State Transfer Select the Enable State Transfer check-box checkbox if you want state transfer to take place over the WAN remote address link. SECONDARY-WAN IF Remote Address This field is visible only when WAN Link Redundancy is enabled. Enter the IPv4 WAN address from the Secondary WAN page of the other system in the pair. This is used to connect to the other system and transfer state information. Tip: Select Enable State Transfer if you want state transfer to take place over this link. Remote Name (Optional) Enter a string to be used in SNMP traps to identify the remote system by name. It is recommended to use Ribbon recommends using the remote systems hostname; however, however you can use any character string. If this field is left blank, the IP address of the remote system will be used in the SNMP trap.