User manual

MX-ONE SYSTEM DESCRIPTION
78 21/1551-ASP 113 01 Uen N2 2014-01-28
5.5 MX-ONE High Availability
MX-ONE offers high availability by supporting the following types of
redundancy in MX-ONE Telephony System:
• Network redundancy, where two types are currently supported:
– Dual subnet network redundancy (Not for new sales).
This type of network redundancy is achieved (provided a
redundant network infrastructure is available) by connecting
Telephony Servers to two LANs. If one of the LANs fails, the
other one will continue to serve the operations and the Tele-
phony Servers will be available on the functioning LAN.
Media gateways using MGU boards support network redun-
dancy. These media gateways will function on the other
network after the disturbance caused by the switch over at
network failure.
In a Media Gateway Classic with LSU-E configuration, the
capacity for gateway calls will be reduced. A switch must be
used to secure control of the hardware when a LAN fails.
If EMGs are evenly distributed over the two LANs, approxi-
mately half of them will still function. During the downtime, the
overall capacity of media processing will be reduced.
– Network redundancy by using Ethernet bonding in the Tele-
phony Servers and Link Failover in the Media Gateway MGU.
Ethernet bonding in the Telephony Servers
By using Ethernet bonding, a Telephony Server is connected
to two separate switches in a switched network. Provided that
the switched network is designed for redundancy, this
provides network redundancy to the Telephony Server.
Ethernet bonding means that two Ethernet interfaces are
aggregated to work together. One interface is active at a time
and the other interface is backup. The two interfaces share the
same IP and MAC addresses. If one of the interfaces fail, the