Chapter 4      Managing Devices
Understanding Redundancy Support
Expected Behaviors for Redundant Devices
What should you expect when using redundant devices in the Hosting Solution 
Engine? 
If a redundant unit is not available, no action can be performed on either device 
pair. Every action is performed on both pairs or neither pair.
The Hosting Solution Engine cannot synchronize device configurations.
Related Topics
Device Name Display in Configure Tab, page 5 6
Understanding CSM Redundancy, page 4 43
Understanding CSS Redundancy, page 4 42
Understanding CSS Redundancy
The CSS redundancy protocol provides chassis level redundancy between two 
CSSs. This feature protects the network and ensures that users have continuous 
access to servers and content.
The Hosting Solution Engine supports the following features:
CSS
 box to box redundancy where a crossover cable connects the master and 
backup CSS interfaces. This requires a management interface to be 
configured on both the master and backup CSS devices.
Virtual IP (VIP) and virtual interface redundancy Provides redundant VIP 
addresses and redundant virtual interfaces for fate sharing (the redundant 
interfaces and redundant VIPs fail over together to the backup CSS) and 
server default gateways.
Release 1.8 does not support configuration of CSS Adaptive Session 
Redundancy.
Note
See the installation documentation or your online help for instructions on setting 
up your network devices. See the Device Manager online help for instructions on 
how to set up device redundancy for the CSS. The redundancy will appear only 
after completing these steps.
User Guide for the CiscoWorks Hosting Solution Engine 1.8.1
4 42
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