Hello here you will see more information about that topic of Bridge mode in campus mode in which i think you are referring to
http://www.arubanetworks.com/pdf/technology/DG_Mobility-Controllers-Deployment-Models-5.0-VRD.pdf
Page 41 and 42
Also this is what it says on the user guide
User guides does point you a list of features you loose on bridge mode page 803
Most ArubaOS features are supported in all forwarding modes. However, there are a some features that are
not supported in one or more forwarding modes. Campus APs do not support split-tunnel forwarding mode
and the decrypt-tunnel forwarding mode does not support TKIP Counter measure management on campus
APs or remote APs.
Bridge mode
Firewall—SIP/SCCP/RTP/RTSP Voice Support
Firewall—Alcatel NOE Support
Voice over Mesh
Video over Mesh
Named VLAN
Captive portal
Rate Limiting for broadcast/multicast
Power save: Wireless battery boost
Power save: Drop wireless multicast traffic
Power save: Proxy ARP (global)
Power save: Proxy ARP (per-SSID)
Automatic Voice Flow Classification
SIP ALG
SIP: SIP authentication tracking
SIP: CAC enforcement enhancements
SIP: Phone number awareness
SIP: R-Value computation
SIP: Delay measurement
Management: Voice-specific views
Management: Voice client statistics
Management: Voice client troubleshooting
Voice protocol monitoring/reporting
SVP ALG
H.323 ALG
Vocera ALG
SCCP ALG
NOE ALG
Layer 3 Mobility
IGMP Proxy Mobility
Mobile IP
TKIP countermeasure mgmt
Bandwidth based CAC
Dynamic Multicast Optimization