HP ProCurve 3400cl-48G Installation And Getting Started Manual page 20

Introducing the Switch
Switch Features
1-12
support for the Spanning Tree Protocol to eliminate network loops
support for up to 30 IEEE 802.1Q-compliant VLANs so you can divide the
attached end nodes into logical groupings that fit your business needs.
support for many advanced features to enhance network performance—
for a description, see the Management and Configuration Guide, which
is on the Documentation CD-ROM that is included with your switch.
download of new switch software for product enhancements or bug fixes.