Features Unique to c2950-i6q4l2-mz.121-22.EA12
DHCP Auto Install with Saved Configuration
DHCP Snooping Counters
Trusted boundary (extended trust for CDP devices)
Common Features in Both Images
AutoQoS - VoIP
CDP (Cisco Discovery Protocol) Version 2
Clear Counters Per Port
CLI String Search
Commented IP Access List Entries
Configurable IGMP Leave Timer
DHCP Client
DHCP Snooping
Enhanced Password Security
ErrDisable Reactivation Per Port
ErrDisable timeout
EtherChannel
EtherChannel - Flexible PAgP
Fast EtherChannel (FEC)
FTP Support for Downloading Software Images
HTTP Security
IEEE 802.1Q VLAN Trunking
IEEE 802.1W Spanning Tree Rapid Reconfiguration
IEEE 802.1x - Auth Fail VLAN
IEEE 802.1x - VLAN Assignment
IEEE 802.1x - Wake on LAN Support
IEEE 802.1x Authenticator
IEEE 802.1x RADIUS Accounting
IEEE 802.3ad Link Aggregation (LACP)
IGMP Fast Leave
IGMP Snooping
IGMP Throttling
Interface Range Specification
IP Named Access Control List
Jumbo Frames
Link Aggregation Control Protocol (LACP) (802.3ad) for Gigabit Interfaces
Multicast Etherchannel Load Balancing
NAC - L2 IEEE 802.1x
Network Time Protocol (NTP)
Packet-Based Storm Control
Parse Bookmarks
Port Security
RADIUS
Reduced MAC Address Usage
RMON events and alarms
Smart Port
SNMP (Simple Network Management Protocol)
SNMPv2C
SNMPv3 (SNMP Version 3)
Spanning Tree Protocol (STP)
Spanning Tree Protocol (STP) - Backbone Fast Convergence
Spanning Tree Protocol (STP) - Loop Guard
Spanning Tree Protocol (STP) - Portfast
Spanning Tree Protocol (STP) - Portfast BPDU Guard
Spanning Tree Protocol (STP) - Root Guard
Spanning Tree Protocol (STP) - Uplink Fast Convergence
Spanning Tree Protocol (STP) - Uplink Load Balancing
Spanning Tree Protocol (STP) Extension
Standard IP Access List Logging
Standby Supervisor Port Usage
Support for 4096 VLAN IDs
Switch Port Analyzer (SPAN)
Tacacs Single Connection
TACACS+
Time-Based Access Lists Using Time Ranges
Unicast Mac Filtering
UniDirectional Link Detection (UDLD)
I used the Cisco Feature Navigator to compare the two images.
hth
