SBC session border controllers 191
APPENDIX C. SBC RESERVATION FUNCTION PROVISION
Starting from firmware version 1.7.0 the redundancy feature is implemented. This feature is automatically
activated by installing an additional SBC-RESERVE license. The principle of operation is that the redundant device is
in sleep mode (SLAVE), without any features and without its IP address in the network, constantly watching the
primary device (MASTER) and, as soon as MASTER fails SLAVE takes over all functions, completely replacing the
failed MASTER. In order to fully duplicate the function, the redundant device constantly receives from the master
the current configuration, subscriber database and other necessary files for work.
Only single-type SBC-1000 or SBC-2000 devices are used to provide redundancy functions.
Consider the connection schemes:
Figure 33 — Redundancy scheme with one switch
Figure 34 — Redundancy scheme with two switches in stack
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