Preface 
The H3C S5120-EI documentation set includes 10 configuration guides, which describe the software 
features for the H3C S5120-EI Switch Series Release 2220, and guide you through the software 
configuration procedures. These configuration guides also provide configuration examples to help you 
apply software features to different network scenarios. 
The High Availability Configuration Guide describes high availability fundamentals and configuration. 
The high availability technologies include fault detection and fault failover. Failure detection technologies 
focus on fault detection and isolation. Failover technologies focus on network recovery. 
This preface includes:  
•  Audience 
•  Added and modified features 
•  Conventions 
•  About the S5120-EI documentation set 
•  Obtaining documentation 
•  Technical support 
•  Documentation feedback 
Audience 
This documentation is intended for: 
•  Network planners 
•  Field technical support and servicing engineers 
•  Network administrators working with the S5120-EI series 
Added and modified features 
Compared to Release 2210, Release 2220 adds and modifies the following features: 
 
Confi
uration 
uide  Added and modified features
High Availability Overview  N/A 
Ethernet OAM  N/A 
CFD N/A 
DLDP 
Modified features: Configuring the DLDP authentication mode and 
authentication password 
RRPP N/A 
Smart Link  N/A 
Monitor Link  N/A 
Track N/A