Cisco Cisco Unified Customer Voice Portal 11.0(1)

CSS Redundancy

CSS supports several types of failover mechanisms. The Virtual IP redundancy mechanism will
allow for a rapid failover from a defined Master CSS to its backup using VRRP. This failover
takes less than three seconds and might or might not additionally incorporate the use of ASR.
Unified CVP transactions to servers do not require a stateful connection to the gateway. If the
CSS fails during a prompt, the VoiceXML documents that drive Unified CVP will retry and
re-stream the prompt from the new CSS access.

For this reason, general VIP redundancy is implemented. The sample below shows the redundant
section for each of the two CSSs.

For information and step-by step configuration guidelines on implementing CSS Redundancy
using the VIP and VRRP mechanism, refer to the CSS Advanced Configuration Guide.

Sample Configuration for CSS Redundancy

The following is a complete CSS sample configuration for each of two CSS Servers configured
in a Virtual Router Redundancy configuration and implementing each of the Unified CVP
Services described above.

CSS Sample Configuration

Note that in this configuration example, a "one-arm" configuration is used because the inbound
traffic and the services exist on the same vlan.

Configuration and Administration Guide for Cisco Unified Customer Voice Portal Release 4.1(1)