High Availability (HA)
is a simple and reliable failover mechanism. This will help Cisco CMX to host
and support to multiple mobility applications seamlessly without any
The definition of
servers used in this section are as follows:
Active server: The CMX
server which is actively serving traffic from the controllers. The virtual IP
address (VIP) for the HA pair should point to the currently active server. The
VIP address is optional.
Primary Server: The CMX
server which will be initially active in the HA pair.
Secondary Server: The CMX
server which will be the backup or standby server in the HA pair.
CMX HA requires two
servers. The primary server acts as the active CMX server. CMX server can use
the virtual IP address also. The primary CMX server is installed by selecting
the Location or Presence node type. In an active HA deployment, data on the
primary server will be continuously synchronized with the secondary server. If
the primary server encounters any issues, the secondary server will take over
the responsibility as the active server.
Install Cisco CMX Release 10.3.x on both servers. From the web
installer, choose either
Location as the node type. Both servers should be the same node
type. After installation completes, each server is considered a standalone
server and has the primary HA role. HA requires both primary and secondary
servers, so the role for one server needs to change. To change the HA role of a
server from primary to secondary, use the
cmxha secondary convert command in
The CMX HA Admin
interface is hosted on CMX port 4242 and be accessed using
http://cmx_ip_address:4242/. Log in to the web interface
cmxadmin as user
ID and the password configured for the cmxadmin during the primary and
secondary server installation. This CMX HA Admin interface is different from
the regular CMX interface which can be accessed at
http://cmx_ip_address. The CMX HA Admin interface will
specifically be used for monitoring and managing High Availability.
Every active CMX
instance is backed by another (inactive) instance. The second CMX instance is
not active until the failover procedure is initiated, either manually or
You can enable HA by
using either Cisco CMX web UI or CLI.
We recommend that
you use the Cisco CMX web UI for HA configuration.