Prerequisites for xHA - BlueCat Address Manager - 9.1.0

Address Manager Administration Guide

Locale
English (United States)
Product name
BlueCat Address Manager
Version
9.1.0
Before you create an xHA pair in Address Manager, make sure you have completed the following prerequisites:
  • You must have at least two connected and managed DNS/DHCP Servers in the configuration running software version 8.3.0 or greater.
  • DNS/DHCP Servers must be either two physical appliances or two virtual machines. Mixed xHA pairs of appliance and VM are NOT supported.
  • Both DNS/DHCP Servers must be at the same software version before creating an xHA pair.
  • Both DNS/DHCP Servers must be configured with NTP before creating an xHA pair to ensure that the xHA setup process correctly configures the DNS/DHCP Servers.
  • Both DNS/DHCP Servers must be of the same profile, such as two DNS/DHCP Server 60 or two DNS/DHCP Server 100 profiles. For details on adding servers, refer to Adding DNS/DHCP Servers to Address Manager.
  • In order to create an xHA pair with the Active node on which the Dedicated Management interface enabled, the Dedicated Management interface on the Passive node must be enabled.
  • The Active and Passive nodes must be on the same network.
  • xHA with IPv4 only: no IPv6 addresses must be present on either the Active or Passive nodes.
  • xHA with IPv4 and IPv6: both the Active and Passive Nodes must be configured with only one IPv6 address. Configuring multiple IPv6 addresses may prevent successful creation of xHA.
  • The servers for the xHA pair must not be associated with a deployment schedule. For information on viewing the servers in a deployment schedule, refer to Deployment schedules.
  • The server intended for the passive role must not be associated with a deployment role. For instructions on how to view the deployment roles assigned to a server, refer to Viewing deployment roles.
  • Remove any old certificates and create identical time settings on both servers.
  • Attention: To avoid split-brain scenarios (where both servers are active or passive at the same time), the use of xHA Backbone Communication is mandatory.
    • When configuring the xHA Backbone for DNS/DHCP Server xHA, it is important that the IPv4 addresses of the xHA interfaces (eth1) are not on the same subnet as the Service interface (eth0) and non-routable IP’s. For DNS/DHCP Servers with Dedicated Management enabled, the IPv4 addresses of the xHA interface must be on a difference subnet as the Management interface (by default, eth2).
    • If you are currently using the xHA/eth1 ports for another purpose, you can reset and then reconfigure them for xHA communication, but you cannot use the eth1 ports for xHA communication and for their previous purpose.
    • If you are upgrading from an earlier version of DNS/DHCP Server software, you must delete each eth1 port to reset it. Previous versions of DNS/DHCP Server software did not support eth1, and eth1 is not reset automatically.
    • Make sure to configure the IPv4 address of the xHA interface (eth1) on a different subnet than any other interface. This is the recommended best practice for direct xHA Backbone connections and connections over switches or wide area networks (WAN).
Attention:
  • If you are currently using the xHA/eth1 ports for another purpose, you can reset and then reconfigure them for xHA communication, but you cannot use the eth1 ports for xHA communication and for their previous purpose.
  • If you are running an xHA pair with xHA Backbone communication configured over switches or WAN, make sure to configure the IPv4 address of eth1 on a different subnet than eth0 and eth2.
  • If you are upgrading from a previous version of DNS/DHCP Server software, you must delete each eth1 port to reset it. Previous versions of DNS/DHCP Server software did not support eth1, and eth1 is not reset automatically.
  • Do not try to configure half-duplex communication. If you try to configure half-duplex, DNS/DHCP Server prevents you from saving the setting and an error message appears. For more information about duplex settings contact https://care.bluecatnetworks.com.
  • You cannot use xHA with Anycast; they are mutually exclusive.
  • You must set the Server Identifier DHCP service option if serving DHCP from xHA pairs configured with VLAN interfaces. For details, refer to DHCP with VLAN and xHA.